Antigen/antibody specificity exchanger

Abstract

An antigen/antibody specificity exchanger is disclosed. It comprises: A) an amino-acid sequence corresponding to an amino-acid sequence of an antibody which specifically binds to a certain antigen, including hapten, B) linked by a link to C) an amino-acid sequence to which a certain antibody binds. Also, a diagnostic reagent comprising an antigen/antibody specificity exchanger according to the invention is disclosed. Said reagent may be e.g. used instead of antisera or monoclonal antibodies in in vitro testing systems, such as immunological tests. Further, a method of treating a disease or disorder caused by a known antigen in an individual in need of an increased number of antigen-specific antibodies is disclosed. In the method a tailor-made antigen/antibody specificity exchanger of the invention is issued. Said method may be e.g. used to redirect a patient's antibodies against poliovirus to fight HIV infection in said patient.

Description

[0001] The present invention relates to an antigen/antibody specificity exchanger, which comprises an amino-acid sequence which specifically binds to a certain antigen linked to an amino-acid sequence to which a certain antibody binds. In vitro the antigen/antibody specificity exchanger of the invention can be used as a diagnostic reagent instead of antisera or monoclonal antibodies in testing systems, and in vivo it can be used to redirect antigens or antibodies to other antibodies or antigens, respectively, than they were originally directed to.

BACKGROUND

[0002] During the past decade the antigenic structure of several viral proteins have been characterized using synthetic peptides, such as the human immunodeficiency virus-1(HIV-1)gp160, and the hepatitis B virus core/e antigens (HBc/eAg). Recently it has been shown that a synthetic peptide corresponding to the complementarity determining region 3 of the heavy chain (CDRH3) of a monoclonal antibody (mAb; F58), directed to the variable third (V3) domain of HIV-1 gp160, may act as a mini antibody and neutralize HIV-1 in vitro. In the experimental part of the present specification, the construction of synthetic peptides combining the CDRH3 domain of the mAb F58, or CDRH1, CDRH2, CDRH3 domain of Ab C1-5, and antigenic regions derived from the HIV-1 gp41, HBc/e antigen, hepatitis C virus (HCV) core protein or from the poliovirus VP1, is shown. These peptides specifically bound the V3 domain of HIV-1. Thus, it was possible to modify the antigenic surface of HIV-1 V3 peptides. This antigen/antibody specificity exchanger will be used for redirecting the reactivity of circulating antibodies and using already existing antibody specificities for a predetermined purpose. It may also serve to alter the composition of the surface of proteins by the addition of foreign determinants. For example, the widely used poliovirus vaccination, together with the high rate of seropositivity to enteroviral proteins may be a suitable pool of antibodies to redirect against other pathogens, such as HIV.

[0003] The complementary determining regions (CDRs) of antibodies are responsible for the specificity of the antibody (1,2). X-ray crystallography has shown that the three CDRs of the variable (V) region of the heavy chain and the three CDRs of the V region of the light chain may all have contact with the epitope in an antigen-antibody complex (3). Single peptides corresponding to the CDRs of mAbs to various antigens have been shown to mimic the recognition capabilities of the respective mAb (4-10). Recently it was shown that a peptide corresponding to CDRH3 of a mAb specific for the V3 region of human immuno deficiency virus-1, holds neutralizing capacity when assayed in vitro (9). It was also observed that the CDRH2 of a mAb to hepatitis B core antigen (HBcAg) is capable of capturing HBcAg (10).

DESCRIPTION OF THE INVENTION

[0004] The present invention is, in one aspect, directed to an antigen/antibody specificity exchanger, which comprises

[0005] A) an amino-acid sequence corresponding to an amino-acid sequence of an antibody which specifically binds to a certain antigen, including hapten,

[0006] B) linked by a link to

[0007] C) an amino-acid sequence to which a certain antibody binds.

[0008] The amino-acid sequence of A) may comprise additional amino acids or sequences on one or both sides of the amino-acid sequence of an antibody which specifically binds to a certain antigen, including hapten. Such additional amino acids and sequences may be, but are not limited to, the amino acids and sequences naturally occurring in said antibody as extensions to the amino-acid sequence of A). The number of amino-acid residues in the amino-acid sequence of A) is preferably at least 5, and is together with possible extensions preferably less than 35.

[0009] Further, the amino-acid sequence of C) may comprise additional amino acids or sequences on one or both sides of the amino-acid sequence to which a certain antibody binds. Such additional amino acids and sequences may be, but are not limited to, the amino acids and sequences naturally occurring as extensions to the amino-acid sequence of C). The number of amino-acid residues in the amino-acid sequence of C) is preferably at least 5, and is together with possible extensions preferably less than 35.

[0010] In an embodiment of the above aspect of the invention said antigen/antibody specificity exchanger of the invention is one wherein said amino-acid sequence of A) corresponds to an amino-acid sequence of a complementarity determining region (CDR) or a framework region of a certain antibody.

[0011] In a further embodiment said antigen/antibody specificity exchanger of the invention is one wherein said amino-acid sequence of C) corresponds to an antibody-binding region of a certain protein, such as one of viral, bacterial or fungal origin.

[0012] In another embodiment said antigen/antibody specificity exchanger of the invention is one wherein said amino-acid sequence of A) is linked to said amino-acid sequence of C) by a link B), which is selected from the group consisting of a direct peptide bond and spacer molecules, such as an amino acid, an amino acid having two amino groups, linear or branched peptides or polypeptides and biotin-avidin-biotin.

[0013] In a preferred embodiment said antigen/antibody specificity exchanger of the invention is one wherein said amino-acid sequence of A) is selected from the group consisting of

SEQ ID NO: 1:
Cys Asp Leu Ile Tyr Tyr Asp Tyr Glu Glu Asp Tyr Tyr Phe
SEQ ID NO: 2:
Cys Asp Leu Ile Tyr Tyr Asp Tyr Glu Glu Asp Tyr Tyr
SEQ ID NO: 3
Thr Tyr Ala Met Asn
SEQ ID NO: 4
Arg Val Arg Ser Lys Ser Phe Asn Tyr Ala Thr Tyr Tyr
Ala Asp Ser Val Lys Gly
and
SEQ ID NO: 5
Pro Ala Gln Gly Ile Tyr Phe Asp Tyr Gly Gly
Phe Ala Tyr

[0014] In another preferred embodiment said antigen/antibody specificity exchanger of the invention is one wherein said amino-acid sequence of C) is selected form the group consisting of

SEQ ID NO: 6:
Pro Pro Asn Ala Pro Ile Leu Ser
SEQ ID NO: 7:
Arg Pro Pro Asn Ala Pro Ile Leu Ser Thr
SEQ.ID NO: 8:
Lys Glu Ile Pro Ala Leu Thr Ala Val Glu Thr Gly
SEQ ID NO: 9:
Pro Ala His Ser Lys Glu Ile Pro Ala Leu Thr Ala
SEQ ID NO: 10:
Trp Gly Cys Ser Gly Lys Leu Ile Cys Thr
SEQ ID NO: 11:
Cys Thr Thr Ala Val Pro Trp Asn Ala Ser
and
SEQ ID NO: 12:
Gln Arg Lys Thr Lys Arg Asn Thr Asn Arg Arg.

[0015] Specific examples of antigen/antibody specificity exchangers of the invention:

Peptide 1:
SEQ ID NO: 13
Cys Asp Leu Ile Tyr Tyr Asp Tyr Glu Glu Asp Tyr Tyr Phe Pro Pro
Asn Ala Pro Ile Leu Ser
Peptide 2:
SEQ ID NO: 14
Cys Asp Leu Ile Tyr Tyr Asp Tyr Glu Glu Asp Tyr Tyr Phe Arg Pro
Pro Asn Ala Pro Ile Leu Ser Thr
Peptide 3:
SEQ ID NO: 15
Cys Asp Leu Ile Tyr Tyr Asp Tyr Glu Glu Asp Tyr Tyr Phe Lys Glu
Ile Pro Ala Leu Thr Ala Val Glu Thr Gly
Peptide 4:
SEQ ID NO: 16
Cys Asp Leu Ile Tyr Tyr Asp Tyr Glu Glu Asp Tyr Tyr Phe Pro Ala
His Ser Lys Glu lie Pro Ala Leu Thr Ala
Peptide 5:
SEQ ID NO: 17
Cys Asp Leu Ile Tyr Tyr Asp Tyr Glu Glu Asp Tyr Tyr Phe Trp Gly
Cys Ser Gly Lys Leu Ile Cys Thr
Peptide 6:
SEQ ID NO: 18
Cys Asp. Leu Ile Tyr Tyr Asp Tyr Giu Glu Asp Tyr Tyr Phe Cys Thr
Thr Ala Val Pro Tip Asn Ala Ser
Peptide 7:
SEQ ID NO: 19
Cys Asp Leu Ile Tyr Tyr Asp Tyr Glu Glu Asp Tyr Tyr Phe
Lys Pro Pro Asn Ala Pro lie Leu Ser Thr
Cys Asp Leu Ile Tyr Tyr Asp Tyr Glu Glu Asp Tyr Tyr he
Peptide 8:
SEQ ID NO: 20
Thr Tyr Ala Met Asn Pro Pro Asn Ala Pro Ile Leu Ser
Peptide 9:
SEQ ID NO: 21
Arg Val Arg Ser Lys Ser Phe Asn Tyr Ala Thr Tyr Tyr Ala Asp Ser
Val Lys Gly Pro Pro Asn Ala Pro lie Leu Ser
Peptide 10;
SEQ ID NO: 22
Pro Ala Gln Gly Ile Tyr Phe Asp Tyr Gly Gly Phe Ala Tyr Pro Pro
Asn Ala Pro Ile Leu Ser
Peptide 11:
SEQ ID NO: 23
Cys Asp Leu Ile Tyr Tyr Asp Tyr Glu Glu Asp Tyr Tyr Gln Arg Lys
Thr Lys Arg Asn Thr Asn Arg Arg

[0016] Another aspect of the invention is directed to a diagnostic reagent comprising an antigen/antibody specificity exchanger according to the invention.

[0017] Such a diagnostic reagent of the invention may be used to detect in vitro specific antigens in biological samples, e.g. body fluid or tissue samples. Thus, the diagnostic reagent of the invention may be used instead of antisera or monoclonal antibodies in in vitro testing systems, such as immunological tests, e.g. Enzyme-Linked Immunosorbent Assay (ELISA), Enzyme Immunoassay (EIA), Western Blot, Radioimmunoassay (RIA) etc. Further, the diagnostic reagent of the invention may be used to investigate biological properties of biological systems.

[0018] Still another aspect of the invention is directed to a method of treating a disease or disorder caused by a known antigen in an individual in need of an increased number of antigen-specific antibodies, which comprises administration to said individual of a sufficient amount of a tailor-made antigen/antibody specificity exchanger according to the invention which binds to certain antibodies known to exist in said individual.

[0019] An individual in need of an increased number of antigen-specific antibodies against a known antigen, which causes a disease or disorder in said individual, may be one who will benefit from getting a rapid increase in the number of such antigen-specific antibodies, or who even lacks or has insufficient ability to elicit antibodies against said known antigen. Said individual may be a human or non-human mammal.

[0020] Such a tailor-made antigen/antibody specificity exhanger according to the invention is designed so that certain antibodies existing in the patient in question, (e.g. antibodies against viral proteins, such as antibodies against poliovirus, antibodies against virus causing measles, antibodies against hepatitis B virus, antibodies against hepatitis C virus, antibodies against HIV-1, whether induced by natural infection or vaccination) binds to the amino-acid sequence of C) and the amino-acid sequence of A) binds to a known antigen causing a disease or disorder in said patient (e.g. HIV).

[0021] Thus, existing antibodies in-said patent are redirected to said known antigen (against which said patient e.g. lacks or has insufficient amount of desired antibodies).

[0022] A specific example of an antigen/antibody specificity exchanger of the invention is a peptide which binds to antibodies against poliovirus and also binds specifically to HIV virus. Thus, already high titres in a patient of antibodies against poliovirus may thus be used to fight HIV infection in said patient.

[0023] Preparation of the Antigen/antibody Specificity Exchanger of the Invention

[0024] The antigen/antibody specificity exchanger of the invention is prepared in any suitable manner known in the art. It is in most cases a peptide, with the exception of the case when it comprises biotin-avidin-biotin as a linker. As is well-know in the art, peptides can be produced by genetic engineering methods or peptide synthesis. In peptide synthesis one amino-acid residue is coupled to the next one in liquid phase, or starting with the solid phase to which the C-terminal of the first amino acid is coupled, whereupon the C-terminal of the next amino acid is coupled to the N-terminal of the first amino acid, etc, finally releasing the build-up peptide from the solid phase.

[0025] The antigen/antibody specificity exchangers presented in Table 1 are all synthetic peptides synthesized according to a method for multiple peptide synthesis (21) and by a Milligen 9050 peptide synthesizer using 9-fluorenylmethoxy-carbonyl-protected amino acid esters (20). All peptides were analysed and/or purified by reverse phase HPLC using a Pep-S 5 m column (Pharmacia-LKB, Uppsala, Sweden), run with a gradient from 10% to 60% CH3CN against water containing 0.1% trifluoro-acetic acid.

[0026] Testing of the Antigen/antibody Specificity Exchanger of the Invention

[0027] Monoclonal antibodies and human sera. The production and characterization of mAb to HBc/eAg has been described (15, 18). The mAb 14E11recognizes the epitope at residues 135-141 (PNAPILS), of the HBc/eAg sequence (15). The monoclonal antibody 14E11 was kindly provided by Dr. Alexander Cimanis, Riga. Two human sera (A and B) reactive to a peptide covering residues 42-55 of VP1 of poliovirus 1 have previously been described (19). A monoclonal antibody against enteroviral VP1 was purchased from Dako (CBV; M7064, Dako, Copenhagen, Denmark)

[0028] Three human sera (C, D and E) positive for antibodies to hepatitis C virus (HCV) core residues 7-19 have previously been described (20).

[0029] Enzyme immuno assays (EIAs). Strain-specific HIV-l V3 peptides were coated on microtiter wells (Nunc 96F Certificated; Nunc, Copenhagen, Denmark) in 100 ml portions at concentrations of from 10 mg/ml to 0.01 mg/ml in 0.05 M sodium carbonate buffer, pH 9.6, at +4° C. overnight. Excess peptides were removed by washing with PBS containing 0.05% Tween 20. The peptide-coated plates were assayed for binding using the peptides of the invention diluted from 100 mg/ml to 0.01 mg/ml in PBS containing 1% BSA, 2% goat serum, and 0.05% Tween 20. The dilutions of the peptides of the invention were added in 100 ml portions and incubated with the adsorbed V3 peptides for 60 minutes at +37° C. Excess test peptides were removed by washing and bound peptide was indicated by the respective mAb or anti-serum, by incubation for 60 minutes at +37° C. The amount of bound antibody was indicated by an additional incubation of enzyme-labelled secondary antibody, rabbit anti-mouse Ig (P260, Dako, Copenhagen, Denmark) for mAbs, and goat anti-human IgG (A-3150; Sigma Chemicals, St. Louis, Mo.) for human antibodies. The amount of bound conjugate was determined by addition of substrate and the absorbances were measured at 492 nm or 405 nm in a spectrophoto-meter.

[0030] Antibody recognition of peptides of the invention. When adsorbed to microplates all peptides of the invention presented in Table 1 except for Nos. 4 (Table 2) and 7 (data not shown) were found to be reactive with the respective antibodies.

[0031] Antigen binding of the peptides of the invention. The anti-genically functional test peptides were further evaluated for binding of HIV-1 V3 peptide, MN-strain. All test peptides which had a functional antigenic region were found to directly bind to the HIV-1 V3 peptide (Tables 3 and 4). As shown in Tables 3 and 4, the reactivity to the HIV-1 V3 peptide was found to be dependent on both concentrations of the test peptides and of V3 peptides, indicating a specific reactivity. This clearly indicates that it was possible to redirect antibodies specific for HIV-1 gp41, HBc/eAg and poliovirus 1 VP1 to bind to the altered antigenic surface of the HIV-1 V3 peptide. It was also found, that pre-incubation of equimolar concentrations of mAb 14E11 and the corresponding test peptide of the invention, did not change the ability of the test peptide mAb complex to bind to the V3 peptide (data not shown). This indicates that it is possible to add antigenic domains to a CDR peptide with retained antigen binding ability of the CDR sequence.

[0032] The ability of the antigen/antibody specificity exchangers to redirect antibodies was further evaluated in a system where the CDRH1, CDRH2 and CDRH3 sequences from mAb C1-5 were added to the epitope sequence for mAb 14E11. A peptide corresponding to the epitope sequence for mAb C1-5, residues 71-90 of HBc/eAg with an Ile at position 80, was adsorbed to microplates. The antigen/-antibody specificity exchangers, based on the C1-5 CDRs, were then added, and the amount bound CDR peptide was indicated by the epitope specific mAb 14E11. The results clearly showed that the mAb 14E11 which originally recognized residues 134-141 of the HBc/eAg sequence was redirected by the antigen/antibody specificity exhanger containing the CDRH2 sequence (Table 5). Also, this reactivity was dependent on the amount CDR added, indicating a specific reaction (p<0.01, Regression analysis; Table 5).

[0033] Further, in Table 7 is shown that the antigen/antibody specificity exchanger of the invention can redirect an existing HBc/eAg specific antibody to significantly bind to HIV-1 V3 peptides of several different subtypes.

[0034] Thus, it is evident that the antigen/antibody exchanger of the invention forms the basis of a novel method for redirecting the specificity of monoclonal and polyclonal antibodies by modifying the antigenic surface of a viral protein.

[0035] It should be understood that the invention comprises antigen/antibody exchangers wherein included amino-acid sequences are chemically stabilized e.g. by cyclization and wherein included amino-acid sequences may have specific amino-acid deletions, additions and/or substitutions. Such modified amino-acid sequences may result in antigen/antibody exchangers exhibiting increased -(or decreased) biological activities.

TABLE 1
Antigen/antibody specificity exchangers of the
invention represented by peptides containing the CDRH3 domain of
mAb F58 or CDRH1, CDRH2, CDRH3 domain of mAb Cl-5 (A) and
different antigenic regions derived from viral proteins (C).
Peptide	Amino-acid		Amino-acid	Source of
No.	sequence (A)	link (B)	sequence (C)	aas (C)	Ref.
1.	SEQ ID NO 1.	peptide	SEQ ID NO 6	HBc/eAg,	15
		bond		aas 134-141
2.	SEQ ID NO 1.	peptide	SEQ ID NO 7	HBc/eAg,	15
		bond		aas 133-142
3.	SEQ ID NO 1.	peptide	SEQ ID NO 8	Polio VP1, aas 39-50	16
		bond
4.	SEQ ID NO 1.	peptide	SEQ ID NO 9	Polio VP1, aas 35-46	16
		bond
5.	SEQ ID NO 1.	peptide	SEQ ID NO 10	HIV-1 gp4l,	20
		bond		aas 596-605
6.	SEQ ID NO 1.	peptide	SEQ ID NO 11	HIV-1 gp41	20
		bond		aas 603-612
7.	2(SEQ ID NO 1)	Lys	SEQ ID NO 7	HBc/eAg,	15
				ass 133-142
8.	SEQ ID NO 3.	peptide	SEQ ID NO 6	HBc/eAg,	15
		bond		aas 134-141
9.	SEQ ID NO 4.	peptide	SEQ ID NO 6	HBc/eAg,	15
		bond		aas 134-141
10.	SEQ ID NO 5.	peptide	SEQ ID NO 6	HBc/eAg,	15
		bond		aas 134-141
11.	SEQ ID NO 2.	peptide	SEQ ID NO 12	HCV core 8-18	22
		bond
Note: aas = amino acids

[0036]

TABLE 2
Testing of antigen/antibody specificity exchanger
of the invention represented by peptides passively
adsorbed to polystyrene for ability to be
recognized by antibodies specific for the antigenic
region presented in the peptide. Values are given as
the absorbance obtained at 492 or 405 nm.
Peptide	Antibody	Amount peptide added (ng/0.1 ml) to solid phase
No.	used	1.000	100	10	1	0.1	0.01
1	14E11	2.500	1.675	0.030	0.010	0.009	0.008
2	14E11	2.500	1.790	0.008	0.006	0.008	0.006
3	CBV	2.500	1.142	0.036	0.020	0.019	0.036
	human A	1.945	1.850	0.486	0.088	0.115	0.116
	human B	1.342	0.770	0.130	0.065	0.090	0.095
4	CBV	0.020	0.018	0.015	0.016	0.017	0.018
	human A	0.059	0.081	0.108	0.109	0.097	0.100
	human B	0.052	0.072	0.091	0.098	0.083	0.100
Note: Regression analysis of the relation between absorbance and peptide concentration gives p < 0.01.

[0037]

TABLE 3
Testing of the HIV-1 V3 peptide-antigen binding
capability of the CDR sequence simultaneously with
the ability to be recognized by monoclonal antibodies
specific for the antigenic region on the test peptide of
the invention. Values are given as the absorbance at 492 nm.
a:
		Amount of
	Anti-	test pep-	Amount V3 peptide added
Peptide	body	tide (ng/	(ng/0.1 ml) to solid phase
No.	used	0.1 ml)	1.000	500	250	125	62.5	31.25
1	14E11	10,000	2.500	2.500	2.500	2.338	1.702	1.198
		5,000	2.500	2.500	2.500	2.190	1.622	1.122
		2,500	2.500	2.500	2.500	2.039	1.394	0.990
		1,250	2.500	2.500	2.500	1.712	0.930	0.771
		625	1.936	0.824	0.380	0.152	0.056	0.053
		312	0.196	0.085	0.044	0.043	0.030	0.025
b:
		Amount of
	Anti-	test pep-	Amount V3 peptide added
Peptide	body	tide (ng/	(ng/0.1 ml)
No.	used	0.1 ml)	1.000	500	250	125	62.5	31.25
4	14E11	10.000	2.500	2.500	2.133	1.560	1.070	0.829
		5.000	2.500	2.500	1.963	1.645	1.074	0.981
		2.500	2.500	2.500	1.729	1.404	0.962	0.747
		1.250	2.500	2.424	1.433	1.327	0.795	0.488
		625	0.835	0.359	0.200	0.120	0.088	0.073
		312	0.099	0.054	0.042	0.049	0.045	0.025
c:
		Amount of
	Anti-	test pep-	Amount peptide added
Peptide	body	tide (ng/	(ng/0.1 ml) to solid phase
No.	used	0.1 ml)	1.000	100	10	1	0.1	0.01
3	CBV	10,000	0.523	0.498	0.162	0.161	0.017	0.017
		1,000	0.053	0.054	0.031	0.027	0.010	0.010
		100	0.034	0.037	0.025	0.029	0.010	0.010
		10	0.023	0.022	0.014	0.014	0.010	0.009
		1	0.013	0.044	0.014	0.017	0.027	0.009
		0.1	0.011	0.009	0.008	0.032	0.013	0.013
Note: Regression analysis of the relation between absorbance and CDR peptide concentration, and relation between absorbance and V3 peptide concentration gives p < 0.01, respectively.

[0038]

TABLE 4
Testing of the HIV-1 V3 peptide antigen binding
capability of the CDR sequence simultaneously with the
ability to be recognized by human anti-polio VP1
polyclonal antibodies specific for the antigenic
region on the test peptides of the invention. Values
are given as the absorbance at 405 nm.
a:
		Amount of
	Anti-	test pep-	Amount V3 peptide added
Peptide	body	tide (ng/	(ng/0.1 ml) to solid phase
No.	used	0.1 ml)	1.000	500	250	125	62.5	31.25
3	human	10,000	1.538	1.356	1.448	1.052	0.280	0.123
	A	5,000	1.179	1.050	1.006	0.557	0.136	0.087
		2,500	0.684	0.558	0.604	0.216	0.084	0.067
		1,250	0.367	0.358	0.332	0.162	0.075	0.062
		625	0.228	0.238	0.220	0.121	0.083	0.063
		312	0.171	0.154	0.154	0.103	0.072	0.060
b:
		Amount of
	Anti-	test pep-	Amount V3 peptide added
Peptide	body	tide (ng/	(ng/0.1 ml) to solid phase
No.	used	0.1 ml)	1.000	500	250	125	62.5	31.25
3	human	10,000	0.366	0.352	0.352	0.200	0.074	0.056
	B	5,000	0.206	0.217	0.188	0.131	0.063	0.053
		2,500	0.134	0.132	0.126	0.091	0.061	0.055
		1,250	0.107	0.114	0.108	0.077	0.060	0.054
		625	0.082	0.104	0.087	0.075	0.063	0.056
		312	0.083	0.091	0.094	0.077	0.068	0.060
Note: Regression analysis of the relation between absorbance and CDR peptide concentration, and relation between absorbance and V3 peptide concentration gives p < 0.01, respectively.

[0039]

TABLE 5
Testing of the HIV-1 V3 peptide antigen capability of the
CDR sequence simultaneous with the ability to be recognized
by human anti-HCV core polyclonal anti-bodies specific
for the antigenic region on the test peptides of the
invention. Values are given as the absorbance at 405 nm.
		Amount of
	Anti-	V3 pep-	Amount of test peptide added
Peptide	body	tide (ng/	(ng/0.1 ml)
No.	used	0.1 ml)	62	31	15	7.5	3.7	1.8
11	human	625	2.500	2.416	2.097	1.473	0.973	0.630
	HCV-C	78	2.500	2.335	1.781	1.225	0.825	0.564
		39	2.389	2.287	1.626	1.081	0.664	0.389
11	human	625	1.999	1.490	1.184	0.751	0.458	0.428
	HCV-D	78	1.758	1.370	1.025	0.612	0.468	0.380
		39	1.643	0.993	0.833	0.497	0.343	0.287
11	human	625	2.368	2.165	1.656	1.104	0.645	0.462
	HCV-E	78	2.156	1.824	1.396	0.733	0.514	0.352
		39	1.893	1.683	1.110	0.756	0.310	0.272

[0040]

TABLE 6
Testing of C1-5 CDRs (10 ug/ml) (in test
peptides of the invention) with a peptide
corresponding to HBc/eAg corresponding to residues
71-90) coated on solid phase. Bound CDR was
indicated by the epitope specific mAb 14E11.
		Amount
		c71-90
	Antibody	peptide	Amount of test peptide added (ng/0.1 ml)
CDR sequence	used	(ng/0.1 ml)	10.000	5.000	2.500	1.250	625	312
Peptide 8:	14E11	625	0.003	0.002	0.002	0.002	0.002	0.002
CDRH1		312	0.002	0.002	0.004	0.003	0.006	0.004
(SEQ ID NO3)		78	0.003	0.003	0.005	0.005	0.003	0.003
Peptide 9:	14E11	625	2.500	1.303	0.070	0.012	0.003	0.002
CDRH2		312	2.500	1.070	0.058	0.011	0.003	0.002
(SEQ ID NO4)		78	2.500	0.868	0.039	0.008	0.003	0.003
Peptide 10:	14E11	625	0.004	0.003	0.004	0.003	0.003	0.003
CDRH3		312	0.004	0.003	0.004	0.004	0.003	0.003
(SEQ ID NO5)		78	0.005	0.004	0.005	0.005	0.004	0.004

[0041]

TABLE 7
Redirecting existing HBc/eAg specific antibody (14E11,
from Dr. A. Tsimanis, Riga) to different subtype-
specific HIV-1 V3 peptides (subtypes A-E) via
specificity exchanger peptide containing CDRH3
sequence against HIV-1 and a HBc/eAg epitope for mAb 14E11.
HIV-1 V3
peptide
attached	Reactivity (absorbance at 405 nm) of specificity
to solid-	exchanger peptide added in the indicated amount (ng)
phase	500	250	125	62.5	31.25	15.625
Subtype A	0.378	0.126	0.078	0.068	0.062	0.017
Subtype B	2.686	2.536	1.710	1.329	0.360	0.157
Subtype C	1.261	0.514	0.111	0.077	0.051	0.020
Subtype D	0.17	0.079	0.065	0.028	0.029	0.026
Subtype E	0.22	0.090	0.093	0.032	0.063	0.030

[0042] References

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Claims

1. An antigen/antibody specificity exchanger, comprising a first specific binding sequence that specifically binds to an antigen, including a hapten, covalently linked to a second sequence comprising an epitope of a pathogen which binds an antibody, wherein said second sequence is at least 5 and less than 35 amino acids in length.

2. The antigen/antibody specificity exchanger according to claim 1, wherein the first specific binding sequence corresponds to an amino acid sequence of a complementarity determining region (CDR).

3. The antigen/antibody specificity exchanger according to claim 1, wherein the covalent linkage is selected from the group consisting of a direct peptide bond and a spacer molecule.

4. The antigen/antibody specificity exchanger according to claim 1, wherein the covalent linkage is biotin-avidin-biotin.

5. An antigen/antibody specificity exchanger, comprising a first specific binding sequence that specifically binds to an antigen, including a hapten, covalently linked to a second sequence comprising an epitope of a pathogen which binds an antibody, wherein said first sequence is at least 5 and less than 35 amino acids in length.

6. The antigen/antibody specificity exchanger according to claim 5, wherein the first specific binding sequence corresponds to an amino acid sequence of a complementarity determining region (CDR).

7. The antigen/antibody specificity exchanger according to claim 5, wherein the covalent linkage is selected from the group consisting of a direct peptide bond and a spacer molecule.

8. The antigen/antibody specificity exchanger according to claim 5, wherein the covalent linkage is biotin-avidin-biotin.

9. An antigen/antibody specificity exchanger, comprising a first specific binding sequence that specifically binds to an antigen, including a hapten, covalently linked to a second sequence comprising an epitope of a pathogen which binds an antibody, wherein said first and second sequence are at least 5 and less than 35 amino acids in length.

10. The antigen/antibody specificity exchanger according to claim 9, wherein the first specific binding sequence corresponds to an amino acid sequence of a complementarity determining region (CDR).

11. The antigen/antibody specificity exchanger according to claim 9, wherein the covalent linkage is selected from the group consisting of a direct peptide bond and a spacer molecule.

12. The antigen/antibody specificity exchanger according to claim 9, wherein the covalent linkage is biotin-avidin-biotin.