Thermostable DNA polymerase from a hyperthermophilic archaeon strain KOD1

Abstract

A nucleic acid amplifying enzyme having a short reaction time and high fidelity is provided. The enzyme of this invention is a thermostable DNA polymerase having a nucleic acid extension rate of at least 30 bases per second and a 3'-5' exonuclease activity. Also provided are a method and kit for amplifying nucleic acid.

Description

FIELD OF THE INVENTION

The present invention relates to a method of amplifying nucleic acid wherein DNA or RNA is amplified within a short reaction time and with a high fidelity, to a method of identifying nucleic acid utilizing said amplifying method and to a DNA polymerase and a reagent kit used for those methods.

[Prior Art]

Many studies have been made already for DNA polymerase of mesophilic microorganism such as Escherichia coli and for DNA polymerase derived from phages infectable by the mesophilic microorganisms. In addition, many studies have been also made already for heat stable DNA polymerases which are useful in a recombinant DNA technique by means of nucleic acid amplification such as a polymerase chain reaction (PCR). Examples of the heat-stable polymerases which are used for the PCR are DNA polymerase (Tth polymerase) mostly derived from Thermus thermophilus and DNA polymerase (Taq polymerase) derived from Thermus aguaticus. Other known examples are DNA polymerase (Pfu polymerase) derived from Pyrococcus furiosus and DNA polymerase (Vent polymerase) derived from Thermococcus litoralis.

[Problems to be Solved by the Invention]

However, with the Taq polymerase, fidelity and thermostability upon the synthesis of DNA are not sufficient. Although the Pfu polymerase exhibiting excellent fidelity and thermostability has been developed, said Pfu polymerase has some problems that its DNA extension rate is slow and a processivity is low whereby it has been used only for a specific PCR.

Recently, a PCR whereby 20 kb or more DNA is amplified (hereinafter, referred to as a long-PCR) has been developed. In said long-PCR, both Taq polymerase and Pfu polymerase are mixed whereby properties of both enzymes are utilized.

However, when two enzymes having different properties are used in the same reaction system, some discrepancies might occur in their appropriate reaction conditions whereby there is a question whether the high extension rate and fidelity which are the advantages of each of those enzymes can be still maintained. Moreover, because of the difference in the thermostabilities and in the composition of the stock solutions of both enzymes, there is a question as to the stability when they are stored in the same container.

In view of the above, there has been a keen demand for novel thermostable polymerase which exhibits both of those advantages.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a stained alkaline agarose gel on which DNA extended by Hyperthermophilic Archaeon Strain KOD1 polymerase for various lengths of time was separated.

FIG. 2a is a stained alkaline agarose gel on which DNA extended for various times using the present polymerase and using Pfu polymerase was separated.

FIG. 2b is a stained alkaline agarose gel on which DNA extended by Deep Vent polymerase and DNA extended by Taq polymerase was separated.

FIG. 3 is a comparison of PCR products obtained using the present polymerase at different reaction times.

FIG. 4 is a schematic drawing of the construction of a recombinant vector encoding the present polymerase gene.

FIG. 5 is a stained SDS-PAGE gel showing the molecular weight of the present polymerase.

FIG. 6 is a stained SDS-PAGE gel showing the PCR products of a reaction driven by the present polymerase.

FIG. 7 is a schematic drawing of the intron and exon structure of the Hyperthermophilic Archaeon strain KOD1 polymerase gene.

SUMMARY OF THE INVENTION

The present inventors have succeeded in preparing a thermostable DNA polymerase from a hyperthermophilic archaeon strain KOD1, and, when its properties are investigated, it has been found that said DNA polymerase exhibits the advantages of the above-mentioned two enzymes, i.e. high extension rate and high fidelity, whereby the present invention has been achieved.

Thus, the present invention relates to a method for amplifying a target nucleic acid comprising reacting the target nucleic acid with four kinds of dNTP and primer complementary to said target nucleic acid in a buffer solution which contains a thermostable DNA polymerase having a DNA extension rate of at least 30 bases/second and a 3'-5' exonuclease activity such that the above mentioned primer is annealed to the target nucleic acid and an extention product is synthesized from the primer.

The present invention further relates to a method for amplifying a target nucleic acid in a sample wherein each target nucleic acid consists of two separate complementary strands which comprises the following steps A to D, characterized in that a thermostable DNA polymerase having a DNA extension rate of at least 30 bases/second and a 3'-5' exonuclease activity is used as a thermostable DNA polymerase;

A: modifying the target nucleic acid, if necessary, to produce single-stranded nucleic acids;

B: reacting the single-stranded nucleic acids with four kinds of dNTP and primers, wherein said primers are selected so as to be sufficiently complementary to different strands of target nucleic acid to anneal therewith, in a buffer solution which contains a thermostable DNA polymerase such that the above mentioned primers are annealed to the single-stranded nucleic acids and extention products are synthesized from the primers,

C: separating the primer extention products from the templates on which they are synthesized to produce single-stranded nucleic acids; and

D: repeatedly conducting the above mentioned steps B and C.

The present invention further relates to a method for detecting a target nucleic acid in a sample wherein each target nucleic acid consists of two separate complementary strands which comprises the following steps A to E, characterized in that a thermostable DNA polymerase having a DNA extension rate of at least 30 bases/second and a 3'-5' exonuclease activity is used as a thermostable DNA polymerase;

A: modifying the target nucleic acid, if necessary, to produce single-stranded nucleic acids;

B: reacting the single-stranded nucleic acids with four kinds of dNTP and primers, wherein said primers are selected so as to be sufficiently complementary to different strands of target nucleic acid to anneal therewith, in a buffer solution which contains a thermostable DNA polymerase such that the above mentioned primers are annealed to the single-stranded nucleic acids and extention products are synthesized from the primers,

C: separating the primer extention products from the templates on which they are synthesized to produce single-stranded nucleic acids;

D: repeatedly conducting the above mentioned steps B and C, and

E: detecting an amplified nucleic acid.

The present invention further relates to a reagent kit for amplifying target nucleic acid which comprises primers, wherein said primers are selected so as to be sufficiently complementary to different strands of target nucleic acid to anneal therewith, four kinds of dNTP, divalent cation, thermostable DNA polymerase having a DNA extension rate of at least 30 bases/second and a 3'-5' exonuclease activity and buffer solution.

The present invention further relates to a reagent kit for detecting target nucleic acid which comprises primers, wherein said primers are selected so as to be sufficiently complementary to different strands of target nucleic acid to anneal therewith, four kinds of dNTP, divalent cation, thermostable DNA polymerase having a DNA extension rate of at least 30 bases/second and a 3'-5' exonuclease activity, amplifying buffer solution, a probe capable of hybridizing with amplified nucleic acid and a detection buffer solution.

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a thermostable DNA polymerase which is obtainable from a strain KOD1 which belongs to a hyperthermophilic archaeon strain.

The present invention relates to an isolated DNA comprising a nucleotide sequence that encodes the thermostable DNA polymerase derived from a KOD1 strain which belongs to hyperthermophilic archaeon.

The present invention further relates to a recombinant DNA expression vector that comprises the DNA sequence inserted into a vector, wherein the DNA sequence encodes the thermostable DNA polymerase derived from a KOD1 strain which belongs to hyperthermophilic archaeon.

The present invention further relates to a transformed recombinant host cell using a recombinant DNA expression vector that comprises the DNA sequence inserted into a vector, wherein the DNA sequence encodes the thermostable DNA polymerase derived from a KOD1 strain which belongs to hyperthermophilic archaeon.

The present invention relates to a method for producing a DNA polymerase obtainable from a KOD1 strain which belongs to hyperthermophilic archaeon, comprising culturing recombinant host cells which are transformed by a recombinant DNA expression vector that comprises the DNA sequence inserted into a vector, wherein the DNA sequence encodes the thermostable DNA polymerase derived from a KOD1 strain which belongs to hyperthermophilic archaeon, and recovering the produced thermostable DNA polymerase.

The present invention further relates to a method for purifying the DNA polymerase obtainable from a KOD1 strain which belongs to hyperthermophilic archaeon, comprising culturing the recombinant host cells which are transformed by a recombinant DNA expression vector that comprises the DNA sequence inserted into a vector, wherein the DNA sequence encodes the thermostable DNA polymerase derived from a KOD1 strain which belongs to hyperthermophilic archaeon, and further (a) recovering the cultured recombinant host cells, lysing them and preparing the cell extract, and (b) removing the impurified proteins derived from recombinant host cells.

The nucleic acid which is to be amplified by the present invention is DNA or RNA. There is no restriction at all for the sample in which such a nucleic acid is contained.

The thermostable enzyme which is used in the present invention is a thermostable DNA polymerase having at least 30 bases/second of DNA extension rate and having a 3'-5' exonuclease activity. Its specific example is a DNA polymerase derived from a hyperthermophilic archaeon strain KOD1 (called a KOD polymerase) and said enzyme may be either a thermostable enzyme purified from nature or an enzyme manufactured by a gene recombination technique.

The DNA extension rate in the present invention is calculated from the relationship between the reaction time and the size of the synthesized DNA in the reaction of various kinds of DNA polymerases such as ROD, Pfu, Deep Vent, Taq, etc. (5U) in each buffer using a substrate prepared by annealing a single-stranded DNA (1.6 .mu.g) of M13 with a primer (16 pmoles) complementary thereto. It is essential in the present invention that the DNA extension rate is at least 30 bases/second.

The DNA extension rates for each of the polymerases are 105-130 bases/second for ROD polymerase, 24.8 bases/second for Pfu polymerase, 23.3 bases/second for Deep Vent polymerase and 61.0 bases/second for Taq polymerase.

On the other hand, it is essential in the present invention that the thermostable DNA polymerase has a 3'-5' exonuclease activity.

In the present invention, the 3'-5' exonuclease activity is determined by checking the rate of release of .sup.3 H under the optimum condition for each polymerase using a substrate wherein the 3'-end of the lambda-DNA digested with HindIII labeled with [.sup.3 H]TTP.

In the 3'-5' exonuclease activity of each polymerase, free-.sup.3 H is found to be only 10-20%. In the case of Taq polymerase and Tth polymerase after an incubation period of three hours, in KOD polymerase and Pfu polymerase, it is 50-70%.

It has been confirmed that the KOD polymerase used in the present invention has a 3'-5' exonuclease activity and that, in the gene which codes for KOD polymerase, there is a DNA conserved sequence showing a 3'-5' exonuclease activity, which is the same as in the case of Pfu polymerase.

In the present invention, the fact whether there is a 3'-5' exonuclease activity is checked in such a manner that KOD polymerase is allowed to stand, using a DNA fragment into which the DNA of [.sup.3 H]TTP-labelled-lambda-DNA digested with HindIII is incorporated as a substrate, at the reaction temperature of 75.degree. C. in a buffer (20 mM Tris-HCl of pH 6.5, 10 mM KCl, 6 mM (NH.sub.4).sub.2 SO.sub.4, 2 mM MgCl.sub.2, 0.1% Triton X-100 and 10 .mu.g/ml BSA) and the ratio of the free-[.sup.3 H]TTP is determined.

At the same time, Taq polymerase and Tth polymerase having no 3'-5' exonuclease activity and Pfu polymerase having a 3'-5' exonuclease activity were checked using a buffer for each of them by the same manner as in the control experiments. The titer of each of the used polymerases was made 2.5 units.

The substrate DNA was prepared in such a manner that, first, 0.2 mM of dATP, dGTP, dCTP and [.sup.3 H]TTP were added to 10 .mu.g of lambda-DNA digested with HindIII, the 3'-end was elongated by Klenow polymerase, then DNA fragments were recovered by extracting with phenol and precipitated with ethanol and free mononucleotides were removed by a Spin column (manufactured by Clontech).

In the case of KOD polymerase and Pfu polymerase, 50-70% of free [.sup.3 H]TTP were detected after an incubation period of three hours, in the case of Taq polymerase and Tth polymerase, only 10-20% of free [.sup.3 H]TTP was noted.

It is preferred that said thermostable DNA polymerase contains an amino acid sequence given in SEQ ID No. 1.

It is also preferred that said thermostable DNA polymerase is an enzyme having the following physical and chemical properties.

Action: It has a DNA synthetic activity and a 3'-5' exonuclease activity.

DNA extension rate: at least 30 bases/second

Optimum pH: 6.5-7.5 (at 75.degree. C.)

Optimum temperature: 75.degree. C.

Molecular weight: about 88-90 Kda

Amino acid sequence: as mentioned in SEQ ID No. 1

An example of the methods for manufacturing DNA polymerase derived from a hyperthermophilic archaeon strain KOD1 is that thermostable DNA polymerase gene was cloned from strain KOD1 which was isolated from a solfatara at a wharf on Kodakara Island, Kagoshima so that a recombinant expression vector was constructed, then a transformant prepared by transformation by said recombinant vector was cultured and the thermostable DNA polymerase was collected from the culture followed by purifying.

In the present invention, the DNA polymerase derived from the above-mentioned hyperthermophilic archaeon strain KOD1 has a DNA synthesizing activity and a 3'-5' exonuclease activity and has a DNA extension rate of at least 30 bases/second. This property is used for conducting an amplification of nucleic acid.

The amplifying method of the present invention includes the following steps A to D.

A: modifying the target nucleic acid, if necessary, to produce single-stranded nucleic acids;

B: reacting the single-stranded nucleic acids with four kinds of dNTP and primers, wherein said primers are selected so as to be sufficiently complementary to different strands of target nucleic acid to anneal therewith, in a buffer solution which contains a thermostable DNA polymerase such that the above mentioned primers are annealed to the single-stranded nucleic acids and extention products are synthesized from the primers,

C: separating the primer extention products from the templates on which they are synthesized to produce single-stranded nucleic acids; and

D: repeatedly conducting the above mentioned steps B and C.

In the step A, the target nucleic acid is denatured if necessary to give a single-stranded nucleic acid. The means therefor may be a thermal treatment, a chemical denaturation or an enzymatic treatment. Preferably, it is a thermal treatment.

In the step B, said single-stranded nucleic acid is made to react with four kinds of dNTP (dATP, dGTP, dCTP and dTTP or dUTP) and primers with regular and inverted directions having complementary base sequences to the target nucleic acid in a buffer solution containing a thermostable DNA polymerase so that said primers are annealed to the single-stranded nucleic acid to conduct a primer extention reaction.

A primer with a regular direction and that with an inverted direction having complementary base sequences to the target nucleic acid are oligonucleotides having a base sequence which is complementary to one strand of target nucleic acid and is homologous to the other strand. Accordingly, one primer may be complementary to another primer elongate.

Preferred buffer solutions containing a thermostable DNA polymerase are Tris buffers containing divalent cation such as magnesium ion.

An example of the conditions for conducting an elongation reaction by annealing the primer is a method in which a cycle of 98.degree. C./1 second-1 minute and 68.degree. C./1 second-10 minutes is repeated for 30 times.

The step of separating an elongated primer for making a single strand in the step C may be a thermal treatment, a chemical treatment or an enzymatic treatment. Preferably, it is a thermal treatment or an enzymatic treatment using RNase.

In the step D, the above-mentioned steps B and C are repeated. To be more specific, it is preferred that heating and cooling of 98.degree. C./20 seconds and 68.degree. C./30 seconds are repeated at least for 30 cycles.

An amplifying method of the present invention is applicable to a PCR for amplifying a DNA of 20 kb or more (hereinafter, referred to as a long-PCR) as well. In this long-PCR, advantages of both high DNA extension rate of Taq polymerase and high fidelity in DNA synthesis caused by a 3'-5' exonuclease activity of Pfu polymerase are necessary and both enzymes are used after mixing them. In this case, there is a question on a stability when both enzymes are stored in the same container because of the difference between their thermostabilities and that between the compositions of their stored solutions. However, in the DNA polymerase derived from a hyperthermophilic archaeon strain KOD1, a single enzyme exhibits both high DNA extension rate and high fidelity due to its 3',-5' exonuclease activity whereby it is possible that a long-PCR can be conducted by its sole use.

In the present invention, the amplified product produced by the above-mentioned amplification such as a labeled probe is used whereby a target nucleic acid can be detected.

Labeled probe is an oligonucleotide having a base sequence which is complementary to a target nucleic acid and is bonded with a labeled substance or a labeled binding substance.

Examples of the labeled substance are enzymes such as alkaline phosphatase, peroxidase and galactosidase, fluorescent substances and radioactive substances while examples of the labeled binding substances are biotin and digoxigenin. Labeled substance may be bonded via biotin, digoxigenin or avidin.

A method of introducing those labels into a probe is that, during the synthesis of oligonucleotide, dNTP to which those labeled substances or labeled binding substances are bonded is used as one of the components of dNTP whereby a synthesis is conducted.

Examples of detecting a nucleic acid bonded with a labeled probe are conventionally known methods such as a Southern hybridization and a Northern hybridization. In those methods, the fact that a hybrid is formed when single-stranded DNA and RNA are complementary each other is utilized whereby unknown nucleic acid fraction group is subjected to an agarose electrophoresis to separate it by size, then the nucleic acid fraction in the gel is subjected, for example, to an alkali treatment, the resulting single strand is transferred to a filter, immobilized and hybridized with a labeled probe.

As to a detection of the label in case an alkaline phosphatase is used as a labeled substance, when a chemoluminescent substrate such as a 1,2-dioxetane compound (PPD) is made to react therewith, only nucleic acid forming a hybrid is illuminated. This is sensitized to an X-ray film whereby the size of the target nucleic acid and its position on electrophoresis can be confirmed.

A reagent kit for nucleic acid amplification according to the present invention contains primers of regular and inverted directions having base sequences complementary to target nucleic acid, four kinds of dNTP, divalent cation, thermostable DNA polymerase having a DNA extension rate of at least 30 bases/second and having a 3'-5' exonuclease activity and a buffer solution.

An example of divalent cation is magnesium ion. Its concentration is preferably about 1-3 mM. Examples of the buffer solution are tris buffer (pH 6.5, 75.degree. C.) and tricine buffer (pH 6.5, 75.degree. C.).

A specific example of the composition is as follows.

20 mM Tris-HCl (pH 6.5, 75.degree. C.) 10 mM KCl 6 mM (NH.sub.4).sub.2 SO.sub.4 1-3 mM MgCl.sub.2 0.1% Triton X-100 10 .mu.g/ml BSA 20-200 .mu.M dNTPs 0.1 pM-1 .mu.M primer 0.1-250 ng template DNA.

A reagent kit for nucleic acid amplification according to the present invention contains a nucleic acid amplifying reagent comprising primers of regular and inverted directions having base sequences complementary to target nucleic acid, four kinds of dNTP, divalent cation, thermostable DNA polymerase having a DNA extension rate of at least 30 bases/second and having a 3'-5' exonuclease activity and a buffer solution for amplification, a target nucleic acid probe and a buffer for detection. The buffer for detection varies depending upon the label. For example, it includes a color reagent or a luminous reagent.

KOD1 which is a kind of hyperthermophilic archaeon used in the present invention is a strain isolated from a solfatara at a wharf on Kodakara Island, Kagoshima.

Mycological properties of said strain are as follows.

Shape of cells: coccus, diplococcus; having flagella. Temperature range for the growth: 65-100.degree. C. Optimum temperature for the growth: 95.degree. C. pH range for the growth: 5-9 Optimum pH: 6 Optimum salt concentration: 2-3% Auxotrophy: heterotrophic Oxygen demand: aerophobic Cell membrane lipids: ether type GC content of DNA: 38%

The hyperthermophilic archaeon strain KOD1 was a coccus having a diameter of about 1 .mu.m and had plural polar flagella. From the mycological properties of the strain, its close relationship with Pfu DNA polymerase-productive bacterium (Pyrococcus furiosus) and with Tli (Vent) DNA polymerase-productive bacterium (Thermococcus litoralis) was suggested.

Cloning of the thermostable DNA polymerase gene of the present invention is carried out as follows.

Thus, the cloning method is that a primer is designed and synthesized depending upon an amino acid sequence in a conserved region of Pfu DNA polymerase (Nucleic Acids Research, 1993, vol.21, No. 2, 259-265).

First, a PCR is conducted using the above-prepared primers (e.g., SEQ ID Nos. 7 and 8) taking chromosomal DNA of the hyperthermophilic archaeon strain KOD1 as a template to amplify the DNA fragment. The DNA sequence (e.g., SEQ ID No. 9) of the amplified fragment is determined and, after confirming that the originally set amino acid sequence is coded for, a Southern hybridization is conducted to the cleaved product of the chromosomal DNA with a restriction enzyme using said fragment as a probe. It is preferred that the approximate size of the fragment containing the target DNA polymerase gene is limited to about 4-7 Kbp.

Then DNA fragment of about 4-7 Kbp is recovered from the gel, a DNA library is prepared by Escherichia coli using said fragment and a colony hybridization is carried out using the above-mentioned PCR-amplified DNA fragment (e.g., SEQ ID No. 9) to collect a clone strain.

The DNA polymerase gene of the strain KOD1 cloned in the present invention is composed of 5010 bases (estimated numbers of amino acids: 1670) (SEQ ID No. 5).

Upon comparison with other DNA polymerases, there is a conserved region of .alpha.DNA polymerase which is an eukaryote type (Regions 1-5) in the gene of the present invention. In addition, there are EXO 1,2,3 which are 3'.fwdarw.5' exonuclease motif at the N terminal of said gene. In the conserved regions (Regions 1, 2) of the thermostable DNA polymerase gene derived from the hyperthermophilic archaeon strain KOD1, each of the intervening sequences is present and they are connected in a form where the open reading frame (ORF) is conserved.

When the thermostable DNA polymerase gene of the hyperthermophilic archaeon strain KOD1 is compared with Pfu DNA polymerase gene derived from Pyrococcus furiosus (Japanese Laid-Open Patent Publication Hei-05/328969) and with Tli (Vent) DNA polymerase gene derived from Thermococcus litoralis (Japanese Laid-Open Patent Publication He-06/7160) which are known enzymes, intervening sequence is present in the gene of the strain KOD1 of the present invention while there is no intervening sequence in the gene of the above-mentioned Pfu DNA polymerase and, in the Tli DNA polymerase gene, there are two kinds of intervening sequences but they are present within Regions 2 and 3 which are conserved regions and that greatly differs from the location where the intervening sequence in the thermostable DNA polymerase gene of KOD1 strain of the present invention exists (Refer to FIG. 7).

The gene of the present invention is a DNA which codes for the DNA polymerase derived from the hyperthermophilic archaeon strain KOD1. An example of said DNA contains a base sequence which codes for the amino acid sequence mentioned in SEQ ID No. 1 or 5. Further, such a DNA contains a base sequence mentioned in SEQ ID No. 5 or 6 or a part thereof.

In order to express the thermostable DNA polymerase derived from the hyperthermophilic archaeon strain KOD1 of the present invention in Escherichia coli, the intervening sequences of 1374-2453 bp and 2708-4316 bp in the base sequence shown by SEQ ID No. 5 are removed by means of a PCR gene fusion to construct a DNA polymerase gene of a complete form. To be specific, a PCR is conducted on a cloned gene containing the intervening sequence by a combination of three pairs of primers to amplify the three fragments which are divided by the intervening sequence. In designing the primers used here, a part of the fragment which is to be bonded to its terminal is contained in its 5'-end. Then a PCR is conducted using the fragments to be bonded utilizing the duplicated sequence of the terminal whereby each of the fragments is bonded. Further PCR is conducted by the same manner using the resulting two kinds of fragments to give a DNA polymerase gene in a complete form containing no DNA polymerase gene derived from the strain KOD1 containing no intervening sequence.

Any vector may be used in the present invention so far as it makes cloning and expression of the thermostable DNA polymerase derived from KOD1 possible and its example is phage and plasmid. An example of the plasmid is a plasmid vector wherein an expression induced by T7 promoter is possible such as pET-8c. Other examples of the plasmid are pUC19, pBR322, pBluescript, pSP73, pGW7, pET3A and pET11C and so on. Examples of the phage are lambda gt11, lambda DASH and lambda ZapII and so on.

Examples of the host cell used in the present invention are Escherichia coli and yeasts. Examples of Escherichia coli are JM109, 101, XL1, PR1 and BL21(DE3)pysS and so on.

In the present invention, the gene coding for the thermostable DNA polymerase derived from the above-mentioned KOD1 is inserted into the above-mentioned vector to give a recombinant vector and the host cell is subjected to a transformation using said recombinant vector.

In the production method of the present invention, the above-mentioned recombinant host cell is cultured whereby the thermostable DNA polymerase gene derived from the strain KOD1 is induced and expressed. The culture medium used for the culture of the recombinant host cell and the condition therefor follow the conventional methods.

In a specific example, Escherichia coli which is transformed by pET-8c plasmid containing a DNA polymerase gene in a complete form containing no intervening sequence derived from the strain KOD1 is cultured, for example, in a TB medium whereby an induction treatment is conducted. It is preferred that the induction treatment of T7 promoter is carried out by addition of isopropyl-thio-.beta.-D-galactoside.

The purifying method of the present invention includes, after culturing the recombinant host cells, a step wherein (a) recombinant host cells are collected, lysed and the cell extract is prepared and a step wherein (b) impure protein derived from the host cells is removed.

The thermostable DNA polymerase which is produced from the recombinant host cells is separated and recovered from the culture liquid by means of centrifugation or the like after culturing the host bacterial cells in a medium followed by inducing. After said bacterial cells are resuspended in a buffer, they are lysed by means of ultrasonic treatment, Dyno mill, French press, etc. Then a thermal treatment is conducted and the heat stable DNA polymerase is recovered from the supernatant fluid. In disintegrating the bacterial cells, ultrasonic treatment, Dyno mill and French press method are preferred.

A thermal treatment is preferred as one of the steps for removing the impure protein derived from the host cells. The condition for the thermal treatment is at 70.degree. C. or higher or, preferably, at 90.degree. or higher. Other means for removing the impure protein are various chromatographic techniques.

Molecular weight of the thermostable DNA polymerase derived from the hyperthermophilic archaeon strain KOD1 obtained as such is about 90 KDa (cf. FIG. 5).

When a polymerase chain reaction is conducted using said thermostable DNA polymerase, a sufficient amplification of the aimed DNA fragments is confirmed (cf. FIG. 6).

Now the present invention will be illustrated by referring partly to the drawings wherein:

FIG. 1 is a photographic picture of electrophoresis as a substitute for a drawing and shows the result of the measurement of the DNA extension rate of the KOD polymerase;

FIG. 2 is a photographic picture of electrophoresis as a substitute for a drawing and shows the comparison of the DNA extension rate of various thermostable DNA polymerases in which FIG. 2a shows the cases of KOD polymerase and Pfu polymerase while FIG. 2b shows the cases of Deep Vent polymerase and Taq polymerase;

FIG. 3 is a photographic picture of electrophoresis as a substitute for a drawing and shows the comparison of the PCR due to the difference in the reaction time of various thermostable DNA polymerase;

FIG. 4 shows the constructive charts of the recombinant expression vector;

FIG. 5 is a photographic picture of electrophoresis as a substitute for a drawing and shows the result of the measurement of molecular weight of the thermostable DNA polymerase derived from KOD1;

FIG. 6 is a photographic picture of electrophoresis as a substitute for a drawing and shows the result of the PCR by the thermostable DNA polymerase derived from KOD1; and

FIG. 7 is drawings which shows a comparison of the DNA polymerase gene derived from the hyperthermophilic archaeon strain KOD1 with the thermostable DNA polymerase gene derived from Pyrococcus furiosus and that derived from Thermococcus litoralis which are thought to be similar bacteria.

EXAMPLE 1

Cloning of DNA Polymerase Gene Derived from hyperthermophilic archaeon strain KOD1

The hyperthermophilic archaeon strain KOD1 isolated in Kodakara Island, Kagoshima was cultured at 95.degree. C. and then the bacterial cells were recovered. Chromosomal DNA of the hyperthermophilic archaeon strain KOD1 was prepared by a conventional method from the resulting bacterial cells.

Two kinds of primers (5'-GGATTAGTATAGTGCCAATGGAAGGCGAC-3' [SEQ ID No. 7] and 5'-GAGGGCGAAGTTTATTCCGAGCTT-3' [SEQ ID No. 8]) were synthesized based upon the amino acid sequence at the conserved region of the DNA polymerase (Pfu polymerase) derived from Pyrococcus furiosus. A PCR was carried out using those two primers where the prepared chromosomal DNA was used as a template.

After the base sequence (SEQ ID No. 9) of the PCR-amplified DNA fragment was determined and the amino acid sequence (SEQ ID No. 10) was determined, a Southern hybridization was conducted using said amplified DNA fragment to the product of the strain KOD1 chromosomal DNA treated with a restriction enzyme whereby the size of the fragment coding for the DNA polymerase was calculated (about 4-7 Kbp). Further, the DNA fragment of this size was recovered from agarose gel, inserted into a plasmid pBS (manufactured by Stratgene) and Escherichia coli (E. coli JM 109) was transformed by this mixture to prepare a library.

A colony hybridization was conducted using a probe (SEQ ID No. 9) used for the Southern hybridization to obtain a clone strain (E. coli JM109/pBSKOD1) which is thought to contain the DNA polymerase gene derived from strain KOD1.

EXAMPLE 2

Determination of Base Sequence of the Clone Fragment

A plasmid pBSKOD1 was recovered from the clone strain E. coli JM109/pBSKOD1 obtained in Example 1 and its base sequence (SEQ ID No. 5) was determined by a conventional method. Further, the amino acid sequence was presumed from the determined base sequence. The DNA polymerase gene derived from KOD1 strain comprised 5010 bases wherein 1670 amino acids were coded.

EXAMPLE 3

Construction of Recombinant Expression Vector

In order to prepare a complete polymerase gene, the intervening sequence parts at two places (1374-2453 bp and 2708-4316 bp) were removed by a PCR fusion method. In the PCR fusion method, three pairs of primers (SEQ ID Nos.11-16) were combined using a primer recovered from the clone strain as a template and a PCR was conducted for each of them to amplify three fragments wherefrom the intervening sequences were removed. At that time, the primer used for the PCR was designed in such a manner that the side which binds to another fragment has the same sequence as the binding partner has. In addition, a design was conducted in such a manner that different restriction enzyme sites (EcoRV at N-terminal while BamHI at C-terminal) were created at both ends.

After that, among the PCR-amplified fragments, that which is located at the central part of the structure and that which is located at the N-terminal side are mixed and a PCR was conducted using each of the fragments as a primer. At the same time, the fragment located at the central part of the structure and that located at the C-terminal side are mixed and a PCR was conducted using each of the fragments as a primer. Two kinds of fragments obtained as such were subjected to a PCR once again to give gene fragments in a complete form having no intervening sequence, having EcoRV and BamHI sites at the N- and C-terminals, respectively and coding for the DNA polymerase derived from strain KOD1.

Further, said gene was subcloned using an expression vector which can be induced by T7 promoter, an NcoI/BamHI site of pET-8c and the previously-created restriction enzyme site to give a recombinant expression vector (pET-pol).

EXAMPLE 4

Expression and Purification of DNA Polymerase Derived from KOD1

Escherichia coli (BL21(DE3)) was transformed using a recombinant expression vector (pET-pol) obtained in Example 3, the resulting transformant was cultured in a TB medium (mentioned in Molecular Cloning, p.A.2, 1989) and, at one hour before collecting the bacterial cells, an induction treatment of T7 promoter was conducted by addition of isopropylthio-.beta.-D-galactopyrenoside. Bacterial cells were recovered from the cultured liquid by means of centrifugation. They were resuspended in a buffer and disintegrated by an ultrasonic treatment to give a cell extract. In order to remove the impure protein derived from the host cells, the disintegrated cell solution was treated at 94.degree. C. for 20 minutes whereby the impure protein derived from the host cells trifugation to give a thermostable. DNA polymerase derived from strain KOD1.

The Escherichia coli BL21 (DE3) pER-pol was deposited on Apr. 22, 1996 under the Budepest Treaty at National Institute of Bioscience and Human-Technology Agency of Industrial Science and Technology (1-3, Higashi 1 chome Tsukuba-shi Ibaraki-ken 305, JAPAN) in accordance with the Budapest Treaty under the accession number FERM BP-5513.

EXAMPLE 5

Purification of Thermostable DNA Polymerase Derived from KOD1

Molecular weight of the thermostable DNA polymerase derived from KOD1 obtained in Example 4 was calculated by means of an SDS-PAGE method whereby it was found to be about 86-92 kDa (FIG. 5). Further, a PCR was conducted using the thermostable DNA polymerase derived from KOD1 obtained in Example 4 and the known template primer whereupon a DNA fragment which was to be a target was confirmed (FIG. 6) by the same manner as in the case where the thermostable DNA polymerase derived from Thermococcus litoralis was used and a high thermostable DNA polymerase activity was confirmed.

COMPARATIVE EXAMPLE 1

Comparison with the Thermostable DNA Polymerase Gene Derived from Pyrococcus furiosus or from Thermococcus litoralis which are to be Similar to the Hyperthermophilic archaeon strain KOD1 of the Present Invention

Amino acid sequences were estimated from the DNA sequences of the DNA polymerase gene derived from the hyperthermophilic archaeon strain KOD1 of the present invention (SEQ ID No. 6), the thermostable DNA polymerase gene derived from Pyrococcus furiosus (Japanese Laid-Open Patent Publication Hei-5/328969) and the thermostable DNA polymerase gene derived from Thermococcus litoralis (Japanese Laid-Open Patent Publication Hei-6/7160) and were compared and investigated.

In the DNA polymerase derived from KOD1 of the present invention, there were Regions 1-5 which were the conserved regions of .alpha.DNA polymerase of an eurokaryotic type. Further, there were EXO1, 2 and 3 which were 3'.fwdarw.5' exonuclease motifs at the N-terminal side. However, in each of the Region 1 and Region 2 which were the .alpha.DNA polymerase conserved regions, there were intervening sequences IVS-A and IVS-B (refer to FIG. 7).

On the other hand, in Pfu polymerase which is a thermostable DNA polymerase derived from Pyrococcus furiosus, there was no intervening sequence. In the case of Vent polymerase which is a thermostable DNA polymerase derived from Thermococcus litoralis, there were the intervening sequences (IVS1 and IVS2) in the .alpha.DNA polymerase conserved regions (Region 2 and Region 3) (refer to FIG. 7).

EXAMPLE 6

Measurement of DNA Extension Rate of the DNA Polymerase Derived from Hyperthermophilic archaeon strain KOD1

DNA prepared by annealing the M13mp18DNA with M13P7 primer having a base sequence as mentioned in SEQ ID No. 2 was used as a substrate and the rate of synthesizing the DNA in a reaction buffer solution [20 mM Tris-HCl (pH 7.5 at 75.degree. C.), 10 mM KCl, 6 mM (NH.sub.4).sub.2 SO.sub.4, 2 mM MgCl.sub.2, 0.1% Triton X-100 and 10 .mu.g/ml nuclease-free BSA] containing the DNA polymerase derived from the hyperthermophilic archaeon strain KOD1 manufactured in Examples 1-5 was investigated for the reaction time of 20, 40, 60, 80 and 100 seconds (FIG. 1) or 40, 60, 80 and 100 seconds (FIG. 2). The results are given in FIG. 1 and in FIG. 2.

A part of the DNA sample during the elongation reaction was taken out for each reaction time and was added to a reaction stopping solution (60 mM EDTA, 60 .mu.M NaOH, 0.1% BPB and 30% glycerol) in the same amount.

The DNA samples obtained in the above process were separated and analyzed by means of an alkaline agarose electrophoresis and the size of the synthesized DNA was checked.

1, 2, 3, 4 and 5 in FIG. 1 show the results of the reactions for 0.3 minute (20 seconds), 0.7 minute (40 seconds), 1 minute (60 seconds), 1.3 minutes (80 seconds) and 1.7 minutes (100 seconds), respectively. It is apparent from FIG. 1 that the DNA extension rate of the DNA polymerase derived from the hyperthermophilic archaeon strain KOD1 was 105 bases/second.

1, 2, 3 and 4 in FIG. 2 show the results of the reaction for 0.7 minute (40 seconds), 1 minute (60 seconds), 1.3 minutes (80 seconds) and 1.7 minutes (100 seconds), respectively. It is apparent from FIG. 2 that the DNA extension rate of the DNA polymerase derived from the hyperthermophilic archaeon strain KOD1 was 138 bases/second.

On the other hand, the DNA synthesizing rate of each of Pfu polymerase (Stratgene), Deep Vent polymerase (New England Biolabo) and Taq polymerase (Takara Shuzo) was measured by the same manner in each of the buffers therefor (FIG. 2a and FIG. 2b). The DNA extension rates of those DNA polymerases were 24.8 bases/second for Pfu polymerase, 23.2 bases/second for Deep Vent polymerase and 61.0 bases/second for Taq polymerase.

From the above results, it was suggested that the DNA extension rate of the DNA polymerase derived from the hyperthermophilic archaeon strain KOD1 was about six-fold of those of Pfu polymerase and Deep Vent polymerase and about two-fold of that of Taq polymerase.

EXAMPLE 7

Measurement of Fidelity of the DNA Polymerase Derived from the Hyperthermophilic archaeon strain KOD1 in the Reaction for the Synthesis of DNA

A rate for resulting in an error in the DNA synthesis was measured by a method of Kunkel (Kunkel, 1985, Journal of Biological Chemistry, 260, 5787-5796). In this method, a DNA synthesis reaction was conducted using a DNA polymerase derived from the hyperthermophilic archaeon strain KOD1 manufactured in Examples 1-5 using an M13mp18DNA having a gap at a lacZ part containing a part of the genes coding for .beta.-galactosidase as a substrate and transfected to E. coli JM109 in an NZY medium containing 5-bromo-4-chloro-3-indolyl-.beta.-D-galactoside and isopropyl-thio-.beta.-D-galactoside using an M13mp18DNA in which lacZ part was double-stranded.

When .beta.-galactosidase wherein a function is lost or lowered was expressed due to a reading error or a frame shift during the synthetic reaction of DNA, it is not possible to utilize 5-bromo-4-chloro-3-indolyl-.beta.-D-galactoside whereupon the color of plague becomes colorless or light blue. On the other hand, when there is no error in the synthesized DNA and a complete .beta.-galactosidase was expressed, plaque becomes blue. The rate of induction of error was measured in the DNA synthesis from the rate of the sum of colorless and light blue plaque to the total plaque.

The rate of induction of error in the DNA synthesis was also measured for Pfu polymerase (Stratgene), Taq polymerase (Takara Shuzo) and delta Tth polymerase (Toyobo) which were made to react by the same manner.

Further, the rate of induction of error in the DNA synthesis was also measured for a mixture of Taq polymerase and Pfu polymerase. The results are given in Table 1.

TABLE 1______________________________________Measurement of Fidelity in the Reaction of DNA Synthesis ofDNA Polymerase Derived from Hyperthermophilic archaeon strain KODl MutantEnzyme Light Blue White Mutant Total Frequence (10.sup.-4)______________________________________KODl pol. 12 11 23 6619 37.7Pfu 15 15 30 7691 39.0Taq 30 24 54 4141 130.tangle-solidup.Tth 70 45 115 7375 156Taq/Pfu(20:1) 10 20 30 4238 63.7Taq/Pfu(50:1) 10 13 23 4489 53.5______________________________________

It is apparent from Table 1 that the fidelity of the DNA polymerase derived from hyperthermophilic archaeon strain KOD1 in the DNA synthesis reaction is suggested to be superior to Taq polymerase and same as Pfu polymerase. In addition, a mixture of Taq polymerase and Pfu polymerase exhibits a medium fidelity that it is superior to Taq polymerase and inferior to Pfu polymerase.

EXAMPLE 8

Comparison in PCR of Various Thermostable DNA Polymerases by the Difference in the Reaction Time

Lambda-DNA (3 .mu.g) was used as a target nucleic acid; oligonucleotides having a sequence as mentioned in SEQ ID Nos. 3 and 4 were used as primers; and a buffer containing 20 mM Tri-HCl (pH 7.5 at 75.degree. C.), 10 mM KCl, 6 mM (NH.sub.4).sub.2 SO.sub.4, 2 mM MgCl.sub.2, 0.1% Triton X-100, 10 .mu.g/ml BSA and 200 .mu.M dNTPs was used as a buffer. DNA polymerase derived from hyperthermophilic archaeon strain KOD1 (KOD polymerase), Taq polymerase which is widely used for PCR and Pfu polymerase which exhibits 3'-5' exonuclease activity were also used as the thermostable DNA polymerases. The used titer of each polymerase was 2 units.

A PCR amplification reaction was conducted using a DNA Thermal Cycler (Perkin-Elmer) in a schedule wherein a cycle comprising 94.degree. C./20 seconds and 68.degree. C./x second (x: reaction time) was repeated for 30 times. In the case of the DNA polymerase derived from the hyperthermophilic archaeon strain KOD1 (KOD polymerase), amplification of the target DNA was confirmed by conducting 30 cycles of 94.degree. C./20 seconds-68.degree. C./1 second while, in the case of Taq polymerase, amplification of DNA was first confirmed by conducting 30 cycles of 94.degree. C./20 seconds-68.degree. C./10 seconds. In the case of Pfu polymerase, amplification of DNA was at least confirmed by conducting 30 cycles of 94.degree. C./20 seconds-68.degree. C./1 minute. The results are given in FIG. 3.

In the present invention, it is possible to amplify the DNA with a high fidelity within a short reaction time when a DNA polymerase derived from hyperthermophilic archaeon strain KOD1 which is a thermostable DNA polymerase having at least 30 bases/second of DNA extension rate and having a 3'-5' exonuclease activity. When this method is made into a form of a kit, it is possible to improve the simplicity and convenience. In addition, when only one kind of thermostable DNA polymerase having both high extension rate (at least 30 bases/second) which has not been available yet and 3'-5' exonuclease activity is used, it is possible to shorten the time for the primer extention reaction and to amplify the relatively big product with a high fidelity.

__________________________________________________________________________# SEQUENCE LISTING- (1) GENERAL INFORMATION:- (iii) NUMBER OF SEQUENCES: 16- (2) INFORMATION FOR SEQ ID NO: 1:- (i) SEQUENCE CHARACTERISTICS:#acids (A) LENGTH: 774 amino (B) TYPE: amino acid (C) STRANDEDNESS: double (D) TOPOLOGY: linear- (ii) MOLECULE TYPE: protein#1: (xi) SEQUENCE DESCRIPTION: SEQ ID NO:- Met Ile Leu Asp Thr Asp Tyr Ile Thr Glu As - #p Gly Lys Pro Val Ile#15- Arg Ile Phe Lys Lys Glu Asn Gly Glu Phe Ly - #s Ile Glu Tyr Asp Arg# 30- Thr Phe Glu Pro Tyr Phe Tyr Ala Leu Leu Ly - #s Asp Asp Ser Ala Ile# 45- Glu Glu Val Lys Lys Ile Thr Ala Glu Arg Hi - #s Gly Thr Val Val Thr# 60- Val Lys Arg Val Glu Lys Val Gln Lys Lys Ph - #e Leu Gly Arg Pro Val# 80- Glu Val Trp Lys Leu Tyr Phe Thr His Pro Gl - #n Asp Val Pro Ala Ile# 95- Arg Asp Lys Ile Arg Glu His Gly Ala Val Il - #e Asp Ile Tyr Glu Tyr# 110- Asp Ile Pro Phe Ala Lys Arg Tyr Leu Ile As - #p Lys Gly Leu Val Pro# 125- Met Glu Gly Asp Glu Glu Leu Lys Met Leu Al - #a Phe Asp Ile Gln Thr# 140- Leu Tyr His Glu Gly Glu Glu Phe Ala Glu Gl - #y Pro Ile Leu Met Ile145 1 - #50 1 - #55 1 -#60- Ser Tyr Ala Asp Glu Glu Gly Ala Arg Val Il - #e Thr Trp Lys Asn Val# 175- Asp Leu Pro Tyr Val Asp Val Val Ser Thr Gl - #u Arg Glu Met Ile Lys# 190- Arg Phe Leu Arg Val Val Lys Glu Lys Asp Pr - #o Asp Val Leu Ile Thr# 205- Tyr Asn Gly Asp Asn Phe Asp Phe Ala Tyr Le - #u Lys Lys Arg Cys Glu# 220- Lys Leu Gly Ile Asn Phe Ala Leu Gly Arg As - #p Gly Ser Glu Pro Lys225 2 - #30 2 - #35 2 -#40- Ile Gln Arg Met Gly Asp Arg Phe Ala Val Gl - #u Val Lys Gly Arg Ile# 255- His Phe Asp Leu Tyr Pro Val Ile Arg Arg Th - #r Ile Asn Leu Pro Thr# 270- Tyr Thr Leu Glu Ala Val Tyr Glu Ala Val Ph - #e Gly Gln Pro Lys Glu# 285- Lys Val Tyr Ala Glu Glu Ile Thr Pro Ala Tr - #p Glu Thr Gly Glu Asn# 300- Leu Glu Arg Val Ala Arg Tyr Ser Met Glu As - #p Ala Lys Val Thr Tyr305 3 - #10 3 - #15 3 -#20- Glu Leu Gly Lys Glu Phe Leu Pro Met Glu Al - #a Gln Leu Ser Arg Leu# 335- Ile Gly Gln Ser Leu Trp Asp Val Ser Arg Se - #r Ser Thr Gly Asn Leu# 350- Val Glu Trp Phe Leu Leu Arg Lys Ala Tyr Gl - #u Arg Asn Glu Leu Ala# 365- Pro Asn Lys Pro Asp Glu Lys Glu Leu Ala Ar - #g Arg Arg Gln Ser Tyr# 380- Glu Gly Gly Tyr Val Lys Glu Pro Glu Arg Gl - #y Leu Trp Glu Asn Ile385 3 - #90 3 - #95 4 -#00- Val Tyr Leu Asp Phe Arg Ser Leu Tyr Pro Se - #r Ile Ile Ile Thr His# 415- Asn Val Ser Pro Asp Thr Leu Asn Arg Glu Gl - #y Cys Lys Glu Tyr Asp# 430- Val Ala Pro Gln Val Gly His Arg Phe Cys Ly - #s Asp Phe Pro Gly Phe# 445- Ile Pro Ser Leu Leu Gly Asp Leu Leu Glu Gl - #u Arg Gln Lys Ile Lys# 460- Lys Lys Met Lys Ala Thr Ile Asp Pro Ile Gl - #u Arg Lys Leu Leu Asp465 4 - #70 4 - #75 4 -#80- Tyr Arg Gln Arg Ala Ile Lys Ile Leu Ala As - #n Ser Tyr Tyr Gly Tyr# 495- Tyr Gly Tyr Ala Arg Ala Arg Trp Tyr Cys Ly - #s Glu Cys Ala Glu Ser# 510- Val Thr Ala Trp Gly Arg Glu Tyr Ile Thr Me - #t Thr Ile Lys Glu Ile# 525- Glu Glu Lys Tyr Gly Phe Lys Val Ile Tyr Se - #r Asp Thr Asp Gly Phe# 540- Phe Ala Thr Ile Pro Gly Ala Asp Ala Glu Th - #r Val Lys Lys Lys Ala545 5 - #50 5 - #55 5 -#60- Met Glu Phe Leu Asn Tyr Ile Asn Ala Lys Le - #u Pro Gly Ala Leu Glu# 575- Leu Glu Tyr Glu Gly Phe Tyr Lys Arg Gly Ph - #e Phe Val Thr Lys Lys# 590- Lys Tyr Ala Val Ile Asp Glu Glu Gly Lys Il - #e Thr Thr Arg Gly Leu# 605- Glu Ile Val Arg Arg Asp Trp Ser Glu Ile Al - #a Lys Glu Thr Gln Ala# 620- Arg Val Leu Glu Ala Leu Leu Lys Asp Gly As - #p Val Glu Lys Ala Val625 6 - #30 6 - #35 6 -#40- Arg Ile Val Lys Glu Val Thr Glu Lys Leu Se - #r Lys Tyr Glu Val Pro# 655- Pro Glu Lys Leu Val Ile His Glu Gln Ile Th - #r Arg Asp Leu Lys Asp# 670- Tyr Lys Ala Thr Gly Pro His Val Ala Val Al - #a Lys Arg Leu Ala Ala# 685- Arg Gly Val Lys Ile Arg Pro Gly Thr Val Il - #e Ser Tyr Ile Val Leu# 700- Lys Gly Ser Gly Arg Ile Gly Asp Arg Ala Il - #e Pro Phe Asp Glu Phe705 7 - #10 7 - #15 7 -#20- Asp Pro Thr Lys His Lys Tyr Asp Ala Glu Ty - #r Tyr Ile Glu Asn Gln# 735- Val Leu Pro Ala Val Glu Arg Ile Leu Arg Al - #a Phe Gly Tyr Arg Lys# 750- Glu Asp Leu Arg Tyr Gln Lys Thr Arg Gln Va - #l Gly Leu Ser Ala Trp# 765- Leu Lys Pro Lys Gly Thr 770- (2) INFORMATION FOR SEQ ID NO: 2:- (i) SEQUENCE CHARACTERISTICS:#pairs (A) LENGTH: 24 base (B) TYPE: nucleic acid (C) STRANDEDNESS: double (D) TOPOLOGY: linear- (ii) MOLECULE TYPE: other nucleic acid#2: (xi) SEQUENCE DESCRIPTION: SEQ ID NO:# 24GTCA CGAC- (2) INFORMATION FOR SEQ ID NO: 3:- (i) SEQUENCE CHARACTERISTICS:#pairs (A) LENGTH: 20 base (B) TYPE: nucleic acid (C) STRANDEDNESS: double (D) TOPOLOGY: linear- (ii) MOLECULE TYPE: other nucleic acid#3: (xi) SEQUENCE DESCRIPTION: SEQ ID NO:# 20 GGTT- (2) INFORMATION FOR SEQ ID NO: 4:- (i) SEQUENCE CHARACTERISTICS:#pairs (A) LENGTH: 24 base (B) TYPE: nucleic acid (C) STRANDEDNESS: double (D) TOPOLOGY: linear- (ii) MOLECULE TYPE: other nucleic acid- (xi) SEQUENCE DESCRIPTION: SEQ ID NO:4:# 24CGGT CAAT- (2) INFORMATION FOR SEQ ID NO: 5:- (i) SEQUENCE CHARACTERISTICS:#pairs (A) LENGTH: 5342 base (B) TYPE: nucleic acid (C) STRANDEDNESS: doub - #le (D) TOPOLOGY: linear- (ii) MOLECULE TYPE: cDNA- (vi) ORIGINAL SOURCE: Hyperthermophilic arch - #aeon#5: (xi) SEQUENCE DESCRIPTION: SEQ ID NO:- GCTTGAGGGC CTGCGGTTAT GGGACGTTGC AGTTTGCGCC TACTCAAAGA TG - #CCGGTTTT 60- ATAACGGAGA AAAATGGGGA GCTATTACGA TCTCTCCTTG ATGTGGGGTT TA - #CAATAAAG 120#GAC ACT GAC 173T TATGGGGGAT GAAAG ATG ATC CTC# Met Ile Leu Asp Thr Asp# 5- TAC ATA ACC GAG GAT GGA AAG CCT GTC ATA AG - #A ATT TTC AAG AAG GAA 221Tyr Ile Thr Glu Asp Gly Lys Pro Val Ile Ar - #g Ile Phe Lys Lys Glu# 20- AAC GGC GAG TTT AAG ATT GAG TAC GAC CGG AC - #T TTT GAA CCC TAC TTC 269Asn Gly Glu Phe Lys Ile Glu Tyr Asp Arg Th - #r Phe Glu Pro Tyr Phe# 35- TAC GCC CTC CTG AAG GAC GAT TCT GCC ATT GA - #G GAS GTC AAG AAG ATA 317Tyr Ala Leu Leu Lys Asp Asp Ser Ala Ile Gl - #u Glu Val Lys Lys Ile# 50- ACC GCC GAG AGG CAC GGG ACG GTT GTA ACG GT - #T AAG CGG GTT GAA AAG 365Thr Ala Glu Arg His Gly Thr Val Val Thr Va - #l Lys Arg Val Glu Lys# 70- GTT CAG AAG AAG TTC CTC GGG AGA CCA GTT GA - #G GTC TGG AAA CTC TAC 413Val Gln Lys Lys Phe Leu Gly Arg Pro Val Gl - #u Val Trp Lys Leu Tyr# 85- TTT ACT CAT CCG CAG GAC GTC CCA GCG ATA AG - #G GAC AAG ATA CGA GAG 461Phe Thr His Pro Gln Asp Val Pro Ala Ile Ar - #g Asp Lys Ile Arg Glu# 100- CAT GGA GCA GTT ATT GAC ATC TAC GAG TAC GA - #C ATA CCC TTC GCC AAG 509His Gly Ala Val Ile Asp Ile Tyr Glu Tyr As - #p Ile Pro Phe Ala Lys# 115- CGC TAC CTC ATA GAC AAG GGA TTA GTG CCA AT - #G GAA GGC GAC GAG GAG 557Arg Tyr Leu Ile Asp Lys Gly Leu Val Pro Me - #t Glu Gly Asp Glu Glu# 130- CTG AAA ATG CTC GCC TTC GAC ATT CAA ACT CT - #C TAC CAT GAG GGC GAG 605Leu Lys Met Leu Ala Phe Asp Ile Gln Thr Le - #u Tyr His Glu Gly Glu135 1 - #40 1 - #45 1 -#50- GAG TTC GCC GAG GGG CCA ATC CTT ATG ATA AG - #C TAC GCC GAC GAG GAA 653Glu Phe Ala Glu Gly Pro Ile Leu Met Ile Se - #r Tyr Ala Asp Glu Glu# 165- GGG GCC AGG GTG ATA ACT TGG AAG AAC GTG GA - #T CTC CCC TAC GTT GAC 701Gly Ala Arg Val Ile Thr Trp Lys Asn Val As - #p Leu Pro Tyr Val Asp# 180- GTC GTC TCG ACG GAG AGG GAG ATG ATA AAG CG - #C TTC CTC CGT GTT GTG 749Val Val Ser Thr Glu Arg Glu Met Ile Lys Ar - #g Phe Leu Arg Val Val# 195- AAG GAG AAA GAC CCG GAC GTT CTC ATA ACC TA - #C AAC GGC GAC AAC TTC 797Lys Glu Lys Asp Pro Asp Val Leu Ile Thr Ty - #r Asn Gly Asp Asn Phe# 210- GAC TTC GCC TAT CTG AAA AAG CGC TGT GAA AA - #G CTC GGA ATA AAC TTC 845Asp Phe Ala Tyr Leu Lys Lys Arg Cys Glu Ly - #s Leu Gly Ile Asn Phe215 2 - #20 2 - #25 2 -#30- GCC CTC GGA AGG GAT GGA AGC GAG CCG AAG AT - #T CAG AGG ATG GGC GAC 893Ala Leu Gly Arg Asp Gly Ser Glu Pro Lys Il - #e Gln Arg Met Gly Asp# 245- AGG TTT GCC GTC GAA GTG AAG GGA CGG ATA CA - #C TTC GAT CTC TAT CCT 941Arg Phe Ala Val Glu Val Lys Gly Arg Ile Hi - #s Phe Asp Leu Tyr Pro# 260- GTG ATA AGA CGG ACG ATA AAC CTG CCC ACA TA - #C ACG CTT GAG GCC GTT 989Val Ile Arg Arg Thr Ile Asn Leu Pro Thr Ty - #r Thr Leu Glu Ala Val# 275- TAT GAA GCC GTC TTC GGT CAG CCG AAG GAG AA - #G GTT TAC GCT GAG GAA1037Tyr Glu Ala Val Phe Gly Gln Pro Lys Glu Ly - #s Val Tyr Ala Glu Glu# 290- ATA ACA CCA GCC TGG GAA ACC GGC GAG AAC CT - #T GAG AGA GTC GCC CGC1085Ile Thr Pro Ala Trp Glu Thr Gly Glu Asn Le - #u Glu Arg Val Ala Arg295 3 - #00 3 - #05 3 -#10- TAC TCG ATG GAA GAT GCG AAG GTC ACA TAC GA - #G CTT GGG AAG GAG TTC1133Tyr Ser Met Glu Asp Ala Lys Val Thr Tyr Gl - #u Leu Gly Lys Glu Phe# 325- CTT CCG ATG GAG GCC CAG CTT TCT CGC TTA AT - #C GGC CAG TCC CTC TGG1181Leu Pro Met Glu Ala Gln Leu Ser Arg Leu Il - #e Gly Gln Ser Leu Trp# 340- GAC GTC TCC CGC TCC AGC ACT GGC AAC CTC GT - #T GAG TGG TTC CTC CTC1229Asp Val Ser Arg Ser Ser Thr Gly Asn Leu Va - #l Glu Trp Phe Leu Leu# 355- AGG AAG GCC TAT GAG AGG AAT GAG CTG GCC CC - #G AAC AAG CCC GAT GAA1277Arg Lys Ala Tyr Glu Arg Asn Glu Leu Ala Pr - #o Asn Lys Pro Asp Glu# 370- AAG GAG CTG GCC AGA AGA CGG CAG AGC TAT GA - #A GGA GGC TAT GTA AAA1325Lys Glu Leu Ala Arg Arg Arg Gln Ser Tyr Gl - #u Gly Gly Tyr Val Lys375 3 - #80 3 - #85 3 -#90- GAG CCC GAG AGA GGG TTG TGG GAG ACC ATA GT - #G TAC CTA GAT TTT AGA1373Glu Pro Glu Arg Gly Leu Trp Glu Asn Ile Va - #l Tyr Leu Asp Phe Arg# 405- TGC CAT CCA GCC GAT ACG AAG GTT GTC GTC AA - #G GGG AAG GGG ATT ATA1421Cys His Pro Ala Asp Thr Lys Val Val Val Ly - #s Gly Lys Gly Ile Ile# 420- AAC ATC AGC GAG GTT CAG GAA GGT GAC TAT GT - #C CTT GGG ATT GAC GGC1469Asn Ile Ser Glu Val Gln Glu Gly Asp Tyr Va - #l Leu Gly Ile Asp Gly# 435- TGG CAG AGA GTT AGA AAA GTA TGG GAA TAC GA - #C TAC AAA GGG GAG CTT1517Trp Gln Arg Val Arg Lys Val Trp Glu Tyr As - #p Tyr Lys Gly Glu Leu# 450- GTA AAC ATA AAC GGG TTA AAG TGT ACG CCC AA - #T CAT AAG CTT CCC GTT1565Val Asn Ile Asn Gly Leu Lys Cys Thr Pro As - #n His Lys Leu Pro Val455 4 - #60 4 - #65 4 -#70- GTT ACA AAG AAC GAA CGA CAA ACG AGA ATA AG - #A GAC AGT CTT GCT AAG1613Val Thr Lys Asn Glu Arg Gln Thr Arg Ile Ar - #g Asp Ser Leu Ala Lys# 485- TCT TTC CTT ACT AAA AAA GTT AAG GGC AAG AT - #A ATA ACC ACT CCC CTT1661Ser Phe Leu Thr Lys Lys Val Lys Gly Lys Il - #e Ile Thr Thr Pro Leu# 500- TTC TAT GAA ATA GGC AGA GCG ACA AGT GAG AA - #T ATT CCA GAA GAA GAG1709Phe Tyr Glu Ile Gly Arg Ala Thr Ser Glu As - #n Ile Pro Glu Glu Glu# 515- GTT CTC AAG GGA GAG CTC GCT GGC ATA CTA TT - #G GCT GAA GGA ACG CTC1757Val Leu Lys Gly Glu Leu Ala Gly Ile Leu Le - #u Ala Glu Gly Thr Leu# 530- TTG AGG AAA GAC GTT GAA TAC TTT GAT TCA TC - #C CGC AAA AAA CGG AGG1805Leu Arg Lys Asp Val Glu Tyr Phe Asp Ser Se - #r Arg Lys Lys Arg Arg535 5 - #40 5 - #45 5 -#50- ATT TCA CAC CAG TAT CGT GTT GAG ATA ACC AT - #T GGG AAA GAC GAG GAG1853Ile Ser His Gln Tyr Arg Val Glu Ile Thr Il - #e Gly Lys Asp Glu Glu# 565- GAG TTT AGG GAT CGT ATC ACA TAC ATT TTT GA - #G CGT TTG TTT GGG ATT1901Glu Phe Arg Asp Arg Ile Thr Tyr Ile Phe Gl - #u Arg Leu Phe Gly Ile# 580- ACT CCA AGC ATC TCG GAG AAG AAA GGA ACT AA - #C GCA GTA ACA CTC AAA1949Thr Pro Ser Ile Ser Glu Lys Lys Gly Thr As - #n Ala Val Thr Leu Lys# 595- GTT GCG AAG AAG AAT GTT TAT CTT AAA GTC AA - #G GAA ATT ATG GAC AAC1997Val Ala Lys Lys Asn Val Tyr Leu Lys Val Ly - #s Glu Ile Met Asp Asn# 610- ATA GAG TCC CTA CAT GCC CCC TCG GTT CTC AG - #G GGA TTC TTC GAA GGC2045Ile Glu Ser Leu His Ala Pro Ser Val Leu Ar - #g Gly Phe Phe Glu Gly615 6 - #20 6 - #25 6 -#30- GAC GGT TCA GTA AAC AGG GTT AGG AGG AGT AT - #T GTT GCA ACC CAG GGT2093Asp Gly Ser Val Asn Arg Val Arg Arg Ser Il - #e Val Ala Thr Gln Gly# 645- ACA AAG AAC GAG TGG AAG ATT AAA CTG GTG TC - #A AAA CTG CTC TCC CAG2141Thr Lys Asn Glu Trp Lys Ile Lys Leu Val Se - #r Lys Leu Leu Ser Gln# 660- CTT GGT ATC CCT CAT CAA ACG TAC ACG TAT CA - #G TAT CAG GAA AAT GGG2189Leu Gly Ile Pro His Gln Thr Tyr Thr Tyr Gl - #n Tyr Gln Glu Asn Gly# 675- AAA GAT CGG AGC AGG TAT ATA CTG GAG ATA AC - #T GGA AAG GAC GGA TTG2237Lys Asp Arg Ser Arg Tyr Ile Leu Glu Ile Th - #r Gly Lys Asp Gly Leu# 690- ATA CTG TTC CAA ACA CTC ATT GGA TTC ATC AG - #T GAA AGA AAG AAC GCT2285Ile Leu Phe Gln Thr Leu Ile Gly Phe Ile Se - #r Glu Arg Lys Asn Ala695 7 - #00 7 - #05 7 -#10- CTG CTT AAT AAG GCA ATA TCT CAG AGG GAA AT - #G AAC AAC TTG GAA AAC2333Leu Leu Asn Lys Ala Ile Ser Gln Arg Glu Me - #t Asn Asn Leu Glu Asn# 725- AAT GGA TTT TAC AGG CTC AGT GAA TTC AAT GT - #C AGC ACG GAA TAC TAT2381Asn Gly Phe Tyr Arg Leu Ser Glu Phe Asn Va - #l Ser Thr Glu Tyr Tyr# 740- GAG GGC AAG GTC TAT GAC TTA ACT CTT GAA GG - #A ACT CCC TAC TAC TTT2429Glu Gly Lys Val Tyr Asp Leu Thr Leu Glu Gl - #y Thr Pro Tyr Tyr Phe# 755- GCC AAT GGC ATA TTG ACC CAT AAC TCC CTG TA - #C CCC TCA ATC ATC ATC2477Ala Asn Gly Ile Leu Thr His Asn Ser Leu Ty - #r Pro Ser Ile Ile Ile# 770- ACC CAC AAC GTC TCG CCG GAT ACG CTC AAC AG - #A GAA GGA TGC AAG GAA2525Thr His Asn Val Ser Pro Asp Thr Leu Asn Ar - #g Glu Gly Cys Lys Glu775 7 - #80 7 - #85 7 -#90- TAT GAC GTT GCC CCA CAG GTC GGC CAC CGC TT - #C TGC AAG GAC TTC CCA2573Tyr Asp Val Ala Pro Gln Val Gly His Arg Ph - #e Cys Lys Asp Phe Pro# 805- GGA TTT ATC CCG AGC CTG CTT GGA GAC CTC CT - #A GAG GAG AGG CAG AAG2621Gly Phe Ile Pro Ser Leu Leu Gly Asp Leu Le - #u Glu Glu Arg Gln Lys# 820- ATA AAG AAG AAG ATG AAG GCC ACG ATT GAC CC - #G ATC GAG AGG AAG CTC2669Ile Lys Lys Lys Met Lys Ala Thr Ile Asp Pr - #o Ile Glu Arg Lys Leu# 835- CTC GAT TAC AGG CAG AGG GCC ATC AAG ATC CT - #G GCA AAC AGC ATC CTA2717Leu Asp Tyr Arg Gln Arg Ala Ile Lys Ile Le - #u Ala Asn Ser Ile Leu# 850- CCC GAG GAA TGG CTT CCA GTC CTC GAG GAA GG - #G GAG GTT CAC TTC GTC2765Pro Glu Glu Trp Leu Pro Val Leu Glu Glu Gl - #y Glu Val His Phe Val855 8 - #60 8 - #65 8 -#70- AGG ATT GGA GAG CTC ATA GAC CGG ATG ATG GA - #G GAA AAT GCT GGG AAA2813Arg Ile Gly Glu Leu Ile Asp Arg Met Met Gl - #u Glu Asn Ala Gly Lys# 885- GTA AAG AGA GAG GGC GAG ACG GAA GTG CTT GA - #G GTC AGT GGG CTT GAA2861Val Lys Arg Glu Gly Glu Thr Glu Val Leu Gl - #u Val Ser Gly Leu Glu# 900- GTC CCG TCC TTT AAC AGG AGA ACT AAC AAG GC - #C GAG CTC AAG AGA GTA2909Val Pro Ser Phe Asn Arg Arg Thr Asn Lys Al - #a Glu Leu Lys Arg Val# 915- AAG GCC CTG ATT AGG CAC GAT TAT TCT GGC AA - #G GTC TAC ACC ATC AGA2957Lys Ala Leu Ile Arg His Asp Tyr Ser Gly Ly - #s Val Tyr Thr Ile Arg# 930- CTG AAG TCG GGG AGG AGA ATA AAG ATA ACC TC - #T GGC CAC AGC CTC TTC3005Leu Lys Ser Gly Arg Arg Ile Lys Ile Thr Se - #r Gly His Ser Leu Phe935 9 - #40 9 - #45 9 -#50- TCT GTG AGA AAC GGG GAG CTC GTT GAA GTT AC - #G GGC GAT GAA CTA AAT3053Ser Val Arg Asn Gly Glu Leu Val Glu Val Th - #r Gly Asp Glu Leu Lys# 965- CCA GGT GAC CTC GTT GCA GTC CCG CGG AGA TT - #G GAG CTT CCT GAG AGA3101Pro Gly Asp Leu Val Ala Val Pro Arg Arg Le - #u Glu Leu Pro Glu Arg# 980- AAC CAC GTG CTG AAC CTC GTT GAA CTG CTC CT - #T GGA ACG CCA GAA GAA3149Asn His Val Leu Asn Leu Val Glu Leu Leu Le - #u Gly Thr Pro Glu Glu# 995- GAA ACT TTG GAC ATC GTC ATG ACG ATC CCA GT - #C AAG GGT AAG AAG AAC3197Glu Thr Leu Asp Ile Val Met Thr Ile Pro Va - #l Lys Gly Lys Lys Asn# 10105- TTC TTT AAA GGG ATG CTC AGG ACT TTG CGC TG - #G ATT TTC GGA GAG GAA3245Phe Phe Lys Gly Met Leu Arg Thr Leu Arg Tr - #p Ile Phe Gly Glu Glu# 10301020 - # 1025- AAG AGG CCC AGA ACC GCG AGA CGC TAT CTC AG - #G CAC CTT GAG GAT CTG3293Lys Arg Pro Arg Thr Ala Arg Arg Tyr Leu Ar - #g His Leu Glu Asp Leu# 10450- GGC TAT GTC CGG CTT AAG AAG ATC GGC TAC GA - #A GTC CTC GAC TGG GAC3341Gly Tyr Val Arg Leu Lys Lys Ile Gly Tyr Gl - #u Val Leu Asp Trp Asp# 10605- TCA CTT AAG AAC TAC AGA AGG CTC TAC GAG GC - #G CTT GTC GAG AAC GTC3389Ser Leu Lys Asn Tyr Arg Arg Leu Tyr Glu Al - #a Leu Val Glu Asn Val# 10750- AGA TAC AAC GGC AAC AAG AGG GAG TAC CTC GT - #T GAA TTC AAT TCC ATC3437Arg Tyr Asn Gly Asn Lys Arg Glu Tyr Leu Va - #l Glu Phe Asn Ser Ile# 10905- CGG GAT GCA GTT GGC ATA ATG CCC CTA AAA GA - #G CTG AAG GAG TGG AAG3485Arg Asp Ala Val Gly Ile Met Pro Leu Lys Gl - #u Leu Lys Glu Trp Lys# 11101100 - # 1105- ATC GGC ACG CTG AAC GGC TTC AGA ATG AGA AA - #G CTC ATT GAA GTG GAC3533Ile Gly Thr Leu Asn Gly Phe Arg Met Arg Ly - #s Leu Ile Glu Val Asp# 11250- GAG TCG TTA GCA AAG CTC CTC GGC TAC TAC GT - #G AGC GAG GGC TAT GCA3581Glu Ser Leu Ala Lys Leu Leu Gly Tyr Tyr Va - #l Ser Glu Gly Tyr Ala# 11405- AGA AAG CAG AGG AAT CCC AAA AAC GGC TGG AG - #C TAC AGC GTG AAG CTC3629Arg Lys Gln Arg Asn Pro Lys Asn Gly Trp Se - #r Tyr Ser Val Lys Leu# 11550- TAC AAC GAA GAC CCT GAA GTG CTG GAC GAT AT - #G GAG AGA CTC GCC AGC3677Tyr Asn Glu Asp Pro Glu Val Leu Asp Asp Me - #t Glu Arg Leu Ala Ser# 11705- AGG TTT TTC GGG AAG GTG AGG CGG GGC AGG AA - #C TAC GTT GAG ATA CCG3725Arg Phe Phe Gly Lys Val Arg Arg Gly Arg As - #n Tyr Val Glu Ile Pro# 11901180 - # 1185- AAG AAG ATC GGC TAC CTG CTC TTT GAG AAC AT - #G TGC GGT GTC CTA GCG3773Lys Lys Ile Gly Tyr Leu Leu Phe Glu Asn Me - #t Cys Gly Val Leu Ala# 12050- GAG AAC AAG AGG ATT CCC GAG TTC GTC TTC AC - #G TCC CCG AAA GGG GTT3821Glu Asn Lys Arg Ile Pro Glu Phe Val Phe Th - #r Ser Pro Lys Gly Val# 12205- CGG CTG GCC TTC CTT GAG GGG TAC TCA TCG GC - #G ATG GCG ACG TCC ACC3869Arg Leu Ala Phe Leu Glu Gly Tyr Ser Ser Al - #a Met Ala Thr Ser Thr# 12350- GAA CAA GAG ACT CAG GCT CTC AAC GAA AAG CG - #A GCT TTA GCG AAC CAG3917Glu Gln Glu Thr Gln Ala Leu Asn Glu Lys Ar - #g Ala Leu Ala Asn Gln# 12505- CTC GTC CTC CTC TTG AAC TCG GTG GGG GTC TC - #T GCT GTA AAA CTT GGG3965Leu Val Leu Leu Leu Asn Ser Val Gly Val Se - #r Ala Val Lys Leu Gly# 12701260 - # 1265- CAC GAC AGC GGC GTT TAC AGG GTC TAT ATA AA - #C GAG GAG CTC CCG TTC4013His Asp Ser Gly Val Tyr Arg Val Tyr Ile As - #n Glu Glu Leu Pro Phe# 12850- GTA AAG CTG GAC AAG AAA AAG AAC GCC TAC TA - #C TCA CAC GTG ATC CCC4061Val Lys Leu Asp Lys Lys Lys Asn Ala Tyr Ty - #r Ser His Val Ile Pro# 13005- AAG GAA GTC CTG AGC GAG GTC TTT GGG AAG GT - #T TTC CAG AAA AAC GTC4109Lys Glu Val Leu Ser Glu Val Phe Gly Lys Va - #l Phe Gln Lys Asn Val# 13150- AGT CCT CAG ACC TTC AGG AAG ATG GTC GAG GA - #C GGA AGA CTC GAT CCC4157Ser Pro Gln Thr Phe Arg Lys Met Val Glu As - #p Gly Arg Leu Asp Pro# 13305- GAA AAG GCC CAG AGG CTC TCC TGG CTC ATT GA - #G GGG GAC GTA GTG CTC4205Glu Lys Ala Gln Arg Leu Ser Trp Leu Ile Gl - #u Gly Asp Val Val Leu# 13501340 - # 1345- GAC CGC GTT GAG TCC GTT GAT GTG GAA GAC TA - #C GAT GGT TAT GTC TAT4253Asp Arg Val Glu Ser Val Asp Val Glu Asp Ty - #r Asp Gly Tyr Val Tyr# 13650- GAC CTG AGC GTC GAG GAC AAC GAG AAC TTC CT - #C GTT GGC TTT GGG TTG4301Asp Leu Ser Val Glu Asp Asn Glu Asn Phe Le - #u Val Gly Phe Gly Leu# 13805- GTC TAT GCT CAC AAC AGC TAC TAC GGT TAC TA - #C GGC TAT GCA AGG GCG4349Val Tyr Ala His Asn Ser Tyr Tyr Gly Tyr Ty - #r Gly Tyr Ala Arg Ala# 13950- CGC TGG TAC TGC AAG GAG TGT GCA GAG AGC GT - #A ACG GCC TGG GGA AGG4397Arg Trp Tyr Cys Lys Glu Cys Ala Glu Ser Va - #l Thr Ala Trp Gly Arg# 14105- GAG TAC ATA ACG ATG ACC ATC AAG GAG ATA GA - #G GAA AAG TAC GGC TTT4445Glu Tyr Ile Thr Met Thr Ile Lys Glu Ile Gl - #u Glu Lys Tyr Gly Phe# 14301420 - # 1425- AAG GTA ATC TAC AGC GAC ACC GAC GGA TTT TT - #T GCC ACA ATA CCT GGA4493Lys Val Ile Tyr Ser Asp Thr Asp Gly Phe Ph - #e Ala Thr Ile Pro Gly# 14450- GCC GAT GCT GAA ACC GTC AAA AAG AAG GCT AT - #G GAG TTC CTC AAC TAT4541Ala Asp Ala Glu Thr Val Lys Lys Lys Ala Me - #t Glu Phe Leu Asn Tyr# 14605- ATC AAC GCC AAA CTT CCG GGC GCG CTT GAG CT - #C GAG TAC GAG GGC TTC4589Ile Asn Ala Lys Leu Pro Gly Ala Leu Glu Le - #u Glu Tyr Glu Gly Phe# 14750- TAC AAA CGC GGC TTC TTC GTC ACG AAG AAG AA - #G TAT GCG GTG ATA GAC4637Tyr Lys Arg Gly Phe Phe Val Thr Lys Lys Ly - #s Tyr Ala Val Ile Asp# 14905- GAG GAA GGC AAG ATA ACA ACG CGC GGA CTT GA - #G ATT GTG AGG CGT GAC4685Glu Glu Gly Lys Ile Thr Thr Arg Gly Leu Gl - #u Ile Val Arg Arg Asp# 15101500 - # 1505- TGG AGC GAG ATA GCG AAA GAG ACG CAG GCG AG - #G GTT CTT GAA GCT TTG4733Trp Ser Glu Ile Ala Lys Glu Thr Gln Ala Ar - #g Val Leu Glu Ala Leu# 15250- CTA AAG GAC GGT GAC GTC GAG AAG GCC GTG AG - #G ATA GTC AAA GAA GTT4781Leu Lys Asp Gly Asp Val Glu Lys Ala Val Ar - #g Ile Val Lys Glu Val# 15405- ACC GAA AAG CTG AGC AAG TAC GAG GTT CCG CC - #G GAG AAG CTG GTG ATC4829Thr Glu Lys Leu Ser Lys Tyr Glu Val Pro Pr - #o Glu Lys Leu Val Ile# 15550- CAC GAG CAG ATA ACG AGG GAT TTA AAG GAC TA - #C AAG GCA ACC GGT CCC4877His Glu Gln Ile Thr Arg Asp Leu Lys Asp Ty - #r Lys Ala Thr Gly Pro# 15705- CAC GTT GCC GTT GCC AAG AGG TTG GCC GCG AG - #A GGA GTC AAA ATA CGC4925His Val Ala Val Ala Lys Arg Leu Ala Ala Ar - #g Gly Val Lys Ile Arg# 15901580 - # 1585- CCT GGA ACG GTG ATA AGC TAC ATC GTG CTC AA - #G GGC TCT GGG AGG ATA4973Pro Gly Thr Val Ile Ser Tyr Ile Val Leu Ly - #s Gly Ser Gly Arg Ile# 16050- GGC GAC AGG GCG ATA CCG TTC GAC GAG TTC GA - #C CCG ACG AAG CAC AAG5021Gly Asp Arg Ala Ile Pro Phe Asp Glu Phe As - #p Pro Thr Lys His Lys# 16205- TAC GAC GCC GAG TAC TAC ATT GAG AAC CAG GT - #T CTC CCA GCC GTT GAG5069Tyr Asp Ala Glu Tyr Tyr Ile Glu Asn Gln Va - #l Leu Pro Ala Val Glu# 16350- AGA ATT CTG AGA GCC TTC GGT TAC CGC AAG GA - #A GAC CTG CGC TAC CAG5117Arg Ile Leu Arg Ala Phe Gly Tyr Arg Lys Gl - #u Asp Leu Arg Tyr Gln# 16505- AAG ACG AGA CAG GTT GGT TTG AGT GCT TGG CT - #G AAG CCG AAG GGA ACT5165Lys Thr Arg Gln Val Gly Leu Ser Ala Trp Le - #u Lys Pro Lys Gly Thr# 16701660 - # 1665- TGACCTTTCC ATTTGTTTTC CAGCGGATAA CCCTTTAACT TCCCTTTCAA AA - #ACTCCCTT5225- TAGGGAAAGA CCATGAAGAT AGAAATCCGG CGGCGCCCGG TTAAATACGC TA - #GGATAGAA5285- GTGAAGCCAG ACGGCAGGGT AGTCGTCACT GCCCCGAGGG TTCAACGTTG AG - #AAGTT5342- (2) INFORMATION FOR SEQ ID NO: 6:- (i) SEQUENCE CHARACTERISTICS:#pairs (A) LENGTH: 5339 base (B) TYPE: nucleic acid (C) STRANDEDNESS: doub - #le (D) TOPOLOGY: linear- (ii) MOLECULE TYPE: cDNA- (vi) ORIGINAL SOURCE: Hyperthermophilic arch - #aeon#6: (xi) SEQUENCE DESCRIPTION: SEQ ID NO:- GCTTGAGGGC CTGCGGTTAT GGGACGTTGC AGTTTGCGCC TACTCAAAGA TG - #CCGGTTTT 60- ATAACGGAGA AAAATGGGGA GCTATTACGA TCTCTCCTTG ATGTGGGGTT TA - #CAATAAAG 120- CCTGGATTGT TCTACAAGAT TATGGGGGAT GAAAGATGAT CCTCGACACT GA - #CTACATAA 180- CCGAGGATGG AAAGCCTGTC ATAAGAATTT TCAAGAAGGA AAACGGCGAG TT - #TAAGATTG 240- AGTACGACCG GACTTTTGAA CCCTACTTCT ACGCCCTCCT GAAGGACGAT TC - #TGCCATTG 300- AGGAAGTCAA GAAGATAACC GCCGAGAGGC ACGGGACGGT TGTAACGGTT AA - #GCGGGTTG 360- AAAAGGTTCA GAAGAAGTTC CTCGGGAGAC CAGTTGAGGT CTGGAAACTC TA - #CTTTACTC 420- ATCCGCAGGA CGTCCCAGCG ATAAGGGACA AGATACGAGA GCATGGAGCA GT - #TATTGACA 480- TCTACGAGTA CGACATACCC TTCGCCAAGC GCTACCTCAT AGACAAGGGA TT - #AGTGCCAA 540- TGGAAGGCGA CGAGGAGCTG AAAATGCTCG CCTTCGACAT TCAAACTCTC TA - #CCATGAGG 600- GCGAGGAGTT CGCCGAGGGG CCAATCCTTA TGATAAGCTA CGCCGACGAG GA - #AGGGGCCA 660- GGGTGATAAC TTGGAAGAAC GTGGATCTCC CCTACGTTGA CGTCGTCTCG AC - #GGAGAGGG 720- AGATGATAAA GCGCTTCCTC CGTGTTGTGA AGGAGAAAGA CCCGGACGTT CT - #CATAACCT 780- ACAACGGCGA CAACTTCGAC TTCGCCTATC TGAAAAAGCG CTGTGAAAAG CT - #CGGAATAA 840- ACTTCGCCCT CGGAAGGGAT GGAAGCGAGC CGAAGATTCA GAGGATGGGC GA - #CAGGTTTG 900- CCGTCGAAGT GAAGGGACGG ATACACTTCG ATCTCTATCC TGTGATAAGA CG - #GACGATAA 960- ACCTGCCCAC ATACACGCTT GAGGCCGTTT ATGAAGCCGT CTTCGGTCAG CC - #GAAGGAGA1020- AGGTTTACGC TGAGGAAATA ACACCAGCCT GGGAAACCGG CGAGAACCTT GA - #GAGAGTCG1080- CCCGCTACTC GATGGAAGAT GCGAAGGTCA CATACGAGCT TGGGAAGGAG TT - #CCTTCCGA1140- TGGAGGCCCA GCTTTCTCGC TTAATCGGCC AGTCCCTCTG GGACGTCTCC CG - #CTCCAGCA1200- CTGGCAACCT CGTTGAGTGG TTCCTCCTCA GGAAGGCCCT ATGAGAGGAA TG - #AGCTGGCC1260- CCGAACAAGC CCGATGAAAA GGAGCTGGCC AGAAGACGGC AGAGCTATGA AG - #GAGGCTAT1320- GTAAAAGAGC CCGAGAGAGG GTTGTGGGAG AACATAGTGT ACCTAGATTT TA - #GATGCCAT1380- CCAGCCGATA CGAAGGTTGT CGTCAAGGGG AAGGGGATTA TAAACATCAG CG - #AGGTTCAG1440- GAAGGTGACT ATGTCCTTGG GATTGACGGC TGGCAGAGAG TTAGAAAAGT AT - #GGGAATAC1500- GACTACAAAG GGGAGCTTGT AAACATAAAC GGGTTAAAGT GTACGCCCAA TC - #ATAAGCTT1560- CCCGTTGTTA CAAAGAACGA ACGACAAACG AGAATAAGAG ACAGTCTTGC TA - #AGTCTTTC1620- CTTACTAAAA AAGTTAAGGG CAAGATAATA ACCACTCCCC TTTTCTATGA AA - #TAGGCAGA1680- GCGACAAGTG AGAATATTCC AGAAGAAGAG GTTCTCAAGG GAGAGCTCGC TG - #GCATAGTA1740- TTGGCTGAAG GAACGCTCTT GAGGAAAGAC GTTGAATACT TTGATTCATC CC - #GCAAAAAA1800- CGGAGGATTT CACACCAGTA TCGTGTTGAG ATAACCATTG GGAAAGACGA GG - #AGGAGTTT1860- AGGGATCGTA TCACATACAT TTTTGAGCGT TTGTTTGGGA TTACTCCAAG CA - #TCTCGGAG1920- AAGAAAGGAA CTAACGCAGT AACACTCAAA GTTGCGAAGA AGAATGTTTA TC - #TTAAAGTC1980- AAGGAAATTA TGGACAACAT AGAGTCCCTA CATGCCCCCT CGGTTCTCAG GG - #GATTCTTC2040- GAAGGCGACG GTTCAGTAAA CAGGTTAGGA GGAGTATTGT TGCAACCCAG GG - #TACAAAGA2100- ACGAGTGGAA GATTAAACTG GTGTCAAAAC TGCTCTCCCA GCTTGGTATC CC - #TCATCAAA2160- CGTACACGTA TCAGTATCAG GAAAATGGGA AAGATCGGAG CAGGTATATA CT - #GGAGATAA2220- CTGGAAAGGA CGGATTGATA CTGTTCCAAA CACTCATTGG ATTCATCAGT GA - #AAGAAAGA2280- ACGCTCTGCT TAATAAGGCA ATATCTCAGA GGGAAATGAA CAACTTGGAA AA - #CAATGGAT2340- TTTACAGGCT CAGTGAATTC AATGTCAGCA CGGAATACTA TGAGGGCAAG GT - #CTATGACT2400- TAACTCTTGA AGGAACTCCC TACTTTGCCA ATGGCATATT GACCCATAAC TC - #CCTGTACC2460- CCTCAATCAT CATCACCCAC AACGTCTCGC CGGATACGCT CAACAGAGAA GG - #ATGCAAGG2520- AATATGACGT TGCCCCACAG GTCGGCCACC GCTTCTGCAA GGACTTCCCA GG - #ATTTATCC2580- CGAGCCTGCT TGGAGACCTC CTAGAGGAGA GGCAGAAGAT AAAGAAGAAG AT - #GAAGGCCA2640- CGATTGACCC GATCGAGAGG AAGCTCCTCG ATTACAGGCA GAGGGCCATC AA - #GATCCTGG2700- CAAACAGCAT CCTACCCGAG GAATGGCTTC CAGTCCTCGA GGAAGGGGAG GT - #TCACTTCG2760- TCAGGATTGG AGAGCTCATA GACCGGATGA TGGAGGAAAA TGCTGGGAAA GT - #AAAGAGAG2820- AGGGCGAGAC GGAAGTGCTT GAGGTCAGTG GGCTTGAAGT CCCGTCCTTT AA - #CAGGAGAA2880- CTAACAAGGC CGAGCTCAAG AGAGTAAAGG CCCTGATTAG GCACGATTAT TC - #TGGCAAGG2940- TCTACACCAT CAGACTGAAG TCGGGGAGGA GAATAAAGAT AACCTCTGGC CA - #CAGCCTCT3000- TCTCTGTGAG AAACGGGGAG CTCGTTGAAG TTACGGGCGA TGAACTAAAG CC - #AGGTGACC3060- TCGTTGCAGT CCCGCGGAGA TTGGAGCTTC CTGAGAGAAA CCACGTGCTG AA - #CCTCGTTG3120- AACTGCTCCT TGGAACGCCA GAAGAAGAAA CTTTGGACAT CGTCATGACG AT - #CCCAGTCA3180- AGGGTAAGAA GAACTTCTTT AAAGGGATGC TCAGGACTTT GCGCTGGATT TT - #CGGAGAGG3240- AAAAGAGGCC CAGAACCGCG AGACGCTATC TCAGGCACCT TGAGGATCTG GG - #CTATGTCC3300- GGCTTAAGAA GATCGGCTAC GAAGTCCTCG ACTGGGACTC ACTTAAGAAC TA - #CAGAAGGC3360- TCTACGAGGC GCTTGTCGAG AACGTCAGAT ACAACGGCAA CAAGAGGGAG TA - #CCTCGTTG3420- AATTCAATTC CATCCGGGAT GCAGTTGGCA TAATGCCCCT AAAAGAGCTG AA - #GGAGTGGA3480- AGATCGGCAC GCTGAACGGC TTCAGAATGA GAAAGCTCAT TGAAGTGGAC GA - #GTCGTTAG3540- CAAAGCTCCT CGGCTACTAC GTGAGCGAGG GCTATGCAAG AAAGCAGAGG AA - #TCCCAAAA3600- ACGGCTGGAG CTACAGCGTG AAGCTCTACA ACGAAGACCC TGAAGTGCTG GA - #CGATATGG3660- AGAGACTCGC CAGCAGGTTT TTCGGGAAGG TGAGGCGGGG CAGGAACTAC GT - #TGAGATAC3720- CGAAGAAGAT CGGCTACCTG CTCTTTGAGA ACATGTGCGG TGTCCTAGCG GA - #GAACAAGA3780- GGATTCCCGA TGGCGTCTTC ACGTCCCCGA AAGGGGTTCG GCTGGCCTTC CT - #TGAGGGGT3840- ACTCATCGGC GATGGCGACG TCCACCGAAC AAGAGACTCA GGCTCTCAAC GA - #AAAGCGAG3900- CTTTAGCGAA CCAGCTCGTC CTCCTCTTGA ACTCGGTGGG GGTCTCTGCT GT - #AAAACTTG3960- GGCACGACAG CGGCGTTTAC AGGGTCTATA TAAACGAGGA GCTCCCGTTC GT - #AAAGCTGG4020- ACAAGAAAAA GAACGCCTAC TACTCACACG TGATCCCCAA GGAAGTCCTG AG - #CGAGGTCT4080- TTGGGAAGGT TTTCCAGAAA AACGTCAGTC CTCAGACCTT CAGGAAGATG GT - #CGAGGACG4140- GAAGACTCGA TCCCGAAAAG GCCCAGAGGC TCTCCTGGCT CATTGAGGGG GA - #CGTAGTGC4200- TCGACCGCGT TGAGTCCGTT GATGTGGAAG ACTACGATGG TTATGTCTAT GA - #CCTGAGCG4260- TCGAGGACAA CGAGAACTTC CTCGTTGGCT TTGGGTTGGT CTATGCTCAC AA - #CAGCTACT4320- ACGGTTACTA CGGCTATGCA AGGGCGCGCT GGTACTGCAA GGAGTGTGCA GA - #GAGCGTAA4380- CGGCCTGGGG AAGGGAGTAC ATAACGATGA CCATCAAGGA GATAGAGGAA AA - #GTACGGCT4440- TTAAGGTAAT CTACAGCGAC ACCGACGGAT TTTTTGCCAC AATACCTGGA GC - #CGATGCTG4500- AAACCGTCAA AAAGAAGGCT ATGGAGTTCC TCAACTATAT CAACGCCAAA CT - #TCCGGGCG4560- CGCTTGAGCT CGAGTACGAG GGCTTCTACA AACGCGGCTT CTTCGTCACG AA - #GAAGAAGT4620- ATGCGGTGAT AGACGAGGAA GGCAAGATAA CAACGCGCGG ACTTGAGATT GT - #GAGGCGTG4680- ACTGGAGCGA GATAGCGAAA GAGACGCAGG CGAGGGTTCT TGAAGCTTTG CT - #AAAGGACG4740- GTGACGTCGA GAAGGCCGTG AGGATAGTCA AAGAAGTTAC CGAAAAGCTG AG - #CAAGTACG4800- AGGTTCCGCC GGAGAAGCTG GTGATCCACG AGCAGATAAC GAGGGATTTA AA - #GGACTACA4860- AGGCAACCGG TCCCCACGTT GCCGTTGCCA AGAGGTTGGC CGCGAGAGGA GT - #CAAAATAC4920- GCCCTGGAAC GGTGATAAGC TACATCGTGC TCAAGGGCTC TGGGAGGATA GG - #CGACAGGG4980- CGATACCGTT CGACGAGTTC GACCCGACGA AGCACAAGTA CGATGCCGAG TA - #CTACATTG5040- AGAACCAGGT TCTCCCAGCC GTTGAGAGAA TTCTGAGAGC CTTCGGTTAC CG - #CAAGGAAG5100- ACCTGCGCTA CCAGAAGACG AGACAGGTTG GTTTGAGTGC TTGGCTGAAG CC - #GAAGGGAA5160- CTTGACCTTT CCATTTGTTT TCCAGCGGAT AACCCTTTAA CTTCCCTTTC AA - #AAACTCCC5220- TTTAGGGAAA GACCATGAAG ATAGAAATCC GGCGGCGCCC GGTTAAATAC GC - #TAGGATAG5280- AAGTGAAGCC AGACGGCAGG GTAGTCGTCA CTGCCCCGAG GGTTCAACGT TG - #AGAAGTT5339- (2) INFORMATION FOR SEQ ID NO: 7:- (i) SEQUENCE CHARACTERISTICS:#pairs (A) LENGTH: 24 base (B) TYPE: nucleic acid (C) STRANDEDNESS: doub - #le (D) TOPOLOGY: linear- (ii) MOLECULE TYPE: other nucleic acid#7: (xi) SEQUENCE DESCRIPTION: SEQ ID NO:# 24AAGG CGAC- (2) INFORMATION FOR SEQ ID NO: 8:- (i) SEQUENCE CHARACTERISTICS:#pairs (A) LENGTH: 24 base (B) TYPE: nucleic acid (C) STRANDEDNESS: doub - #le (D) TOPOLOGY: linear- (ii) MOLECULE TYPE: other nucleic acid#8: (xi) SEQUENCE DESCRIPTION: SEQ ID NO:# 24CCGA GCTT- (2) INFORMATION FOR SEQ ID NO: 9:- (i) SEQUENCE CHARACTERISTICS:#pairs (A) LENGTH: 324 base (B) TYPE: nucleic acid (C) STRANDEDNESS: doub - #le (D) TOPOLOGY: linear- (ii) MOLECULE TYPE: cDNA#9: (xi) SEQUENCE DESCRIPTION: SEQ ID NO:- GGATTAGTGC CAATGGAAGG CGACGAGGAG CTGAAAATGC TCGCCTTCGA CA - #TTCAAACT 60- CTCTACCATG AGGGCGAGGA GTTCGCCGAG GGGCCAATCC TTATGATAAG CT - #ACGCCGAC 120- GAGGAAGGGG CCAGGGTGAT AACTTGGAAG AACGTGGATC TCCCCTACGT TG - #ACGTCGTC 180- TCGACGGAGA GGGAGATGAT AAAGCGCTTC CTCCGTGTTG TGAAGGAGAA AG - #ACCCGGAC 240- GTTCTCATAA CCTACAACGG CGACAACTTC GACTTCGCCT ATCTGAAAAA GC - #GCTGTGAA 300# 324TCGC CCTC- (2) INFORMATION FOR SEQ ID NO: 10:- (i) SEQUENCE CHARACTERISTICS:#acids (A) LENGTH: 108 amino (B) TYPE: amino acid (C) STRANDEDNESS: double (D) TOPOLOGY: linear- (ii) MOLECULE TYPE: protein#10: (xi) SEQUENCE DESCRIPTION: SEQ ID NO:- Gly Leu Val Pro Met Glu Gly Asp Glu Glu Le - #u Lys Met Leu Ala Phe#15- Asp Ile Gln Thr Leu Tyr His Glu Gly Glu Gl - #u Phe Ala Glu Gly Pro# 30- Ile Leu Met Ile Ser Tyr Ala Asp Glu Glu Gl - #y Ala Arg Val Ile Thr# 45- Trp Lys Asn Val Asp Leu Pro Tyr Val Asp Va - #l Val Ser Thr Glu Arg# 60- Glu Met Ile Lys Arg Phe Leu Arg Val Val Ly - #s Glu Lys Asp Pro Asp# 80- Val Leu Ile Thr Tyr Asn Gly Asp Asn Phe As - #p Phe Ala Tyr Leu Lys# 95- Lys Arg Cys Glu Lys Leu Gly Ile Asn Phe Al - #a Leu# 105- (2) INFORMATION FOR SEQ ID NO: 11:- (i) SEQUENCE CHARACTERISTICS:#pairs (A) LENGTH: 42 base (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear- (ii) MOLECULE TYPE: other nucleic acid#11: (xi) SEQUENCE DESCRIPTION: SEQ ID NO:# 42 CAAA CAGCTACTAC GGTTACTACG GC- (2) INFORMATION FOR SEQ ID NO: 12:- (i) SEQUENCE CHARACTERISTICS:#pairs (A) LENGTH: 32 base (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear- (ii) MOLECULE TYPE: other nucleic acid#12: (xi) SEQUENCE DESCRIPTION: SEQ ID NO:# 32 CAAC GTTGAACCCT CG- (2) INFORMATION FOR SEQ ID NO: 13:- (i) SEQUENCE CHARACTERISTICS:#pairs (A) LENGTH: 46 base (B) TYPE: nucleic acid (C) STRANDEDNESS: sing - #le (D) TOPOLOGY: linear- (ii) MOLECULE TYPE: other nucleic acid#13: (xi) SEQUENCE DESCRIPTION: SEQ ID NO:# 46ATT TTAGATCCCT GTACCCCTCA ATCATC- (2) INFORMATION FOR SEQ ID NO: 14:- (i) SEQUENCE CHARACTERISTICS:#pairs (A) LENGTH: 42 base (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear- (ii) MOLECULE TYPE: other nucleic acid#14: (xi) SEQUENCE DESCRIPTION: SEQ ID NO:# 42 TAGC TGTTTGCCAG GATCTTGATG GC- (2) INFORMATION FOR SEQ ID NO: 15:- (i) SEQUENCE CHARACTERISTICS:#pairs (A) LENGTH: 33 base (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear- (ii) MOLECULE TYPE: other nucleic acid#15: (xi) SEQUENCE DESCRIPTION: SEQ ID NO:# 33 CTGA CTACATAACC GAG- (2) INFORMATION FOR SEQ ID NO: 16:- (i) SEQUENCE CHARACTERISTICS:#pairs (A) LENGTH: 46 base (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear- (ii) MOLECULE TYPE: other nucleic acid#16: (xi) SEQUENCE DESCRIPTION: SEQ ID NO:# 46GGG ATCTAAAATC TAGGTACACT ATGTTC__________________________________________________________________________

Claims

1. A thermostable DNA polymerase which is a strain KOD1 hyperthermophilic archaeon enzyme.

2. The thermostable DNA polymerase of claim 1, which has an amino acid sequence of SEQ ID No. 1.

3. The thermostable DNA polymerase of claim 1, which has the following physical and chemical properties;

Action: catalyzing the extension reaction of nucleotide sequence that is complementary to a template nucleotide sequence, using nucleotide triphosphate as substrate and having a 3'-5' exonuclease activity,

DNA extension rate: at least 30 bases/second

Optimum pH: 6.5-7.5 (at 75.degree. C.)

Optimum temperature: 75.degree. C.

Molecular weight: about 88-90 Kda

Amino acid sequence: SEQ ID No. 1.

4. The DNA polymerase of claim 1, which is a protein.