Process to produce anthracycline glycosides

DESCRIPTION OF THE INVENTION
The present invention relates to a process for the preparation of anthracycline glycosides A.
More particularly, the present invention relates to a process for producing anthracycline glycosides A by converting the sugar moiety of anthracycline glycosides B, represented by the following formula, ##STR3## into the sugar moiety of anthracycline glycosides A, represented by the following formula, ##STR4## with the aid of a microorganism belonging to the species Streptomyces galilaeus or Streptomyces melanogenes.
It is known that anthracycline glycosides A and B are effective against tumours. Furthermore, according to the article, i.e. Umezawa et al., "New antitumor antibiotics, Aclacinomycin A and B", J. Antibiotics, 28,830,1975, it is reported that the antitumor activity of aclacinomycin A is stronger than that of aclacinomycin B. However, according to the conventional fermentation method, there are obtained not only anthracycline glycosides A but also anthracyline glycosides B.
The process provided by the present invention enables anthracycline glycosides A having the stronger antitumor acitivity to be manufactured from anthracycline glycosides B in high yield and in a very simple manner. This process comprises converting the sugar moiety of anthracycline glycosides B, represented by the aforementioned formula B, into the sugar moiety of athracycline glycosides A, represented by the aforementioned formula A, with the air of a microorganism belonging to the species Streptomyces galilaeus or Streptomyces melanogenes, and capable of converting said anthracycline glycoside B into the corresponding anthracycline glycoside A.
The process provided by the present invention conveniently applies to the process for producing especially aclacinomycin A, auramycin A, sulfurmycin A, cinerbin A, 1-hydroxyauramycin A or 1-hydroxysulfurmycin A from each corresponding anthracycline glycoside B.
The chemical structures of said anthracycline glycosides A and B are as follows. ##STR5##
______________________________________Anthracycline glycosides R.sub.1 R.sub.2______________________________________Aclacinomycin H CH.sub.2 CH.sub.3Auramycin H CH.sub.3Sulfurmycin H CH.sub.2 COCH.sub.3Cinerubin OH CH.sub.2 CH.sub.31-Hydroxyauramycin OH CH.sub.31-Hydroxysulfurmycin OH CH.sub.2 COCH.sub.3______________________________________
The microorganism used in the process provided by the present invention is a microorganism belonging to the species Streptomyces galilaeus or Streptomyces melanogenes and capable of converting anthracycline glycosides B into the corresponding anthracycline glycosides A.
Preferred strains which can be used in the process provided by the present invention are Streptomyces galilaeus OBB-111, Streptomyces galilaeus OBB-731 and Streptomyces galilaeus FR-401 which have been isolated from soils in Neuschwanstein, Oberammergau and Murnau respectively, Oberbayern, West Germany; and Streptomyces galilaeus AC-628 and Streptomyces melanogenes AC-180 which have been isolated from soils in Ohtsu, Kumamoto-ken and Atami, Shizuoka-ken respectively, Japan; as well as mutants and variants thereof, preferably Streptomyces galilaeus OBB-111-848 derived from the strain Streptomyces galilaeus OBB-111 by treatment with N-methyl-N'-nitro-N-nitrosoguanidine. Such mutants can be obtained from the parent strains by conventional mutation methods, for example by irradiation with UV light, X-rays or .gamma.-rays, or by treatment with suitable mutagens. The strains Streptomyces galilaeus OBB-111, Streptomyces galilaeus OBB-731, Streptomyces galilaeus FR-401, Streptomyces galilaeus AC-628, Streptomyces melanogenes AC-180 and Streptomyces galilaeus OBB-111-848 have been deposited in the Agency of Industrial Science and Technology, Fermentation Research Institute, Japan, under FERM-P No. 4780, FERM-P No. 5402, FERM-P No. 4882, FERM-P No. 4783, FERM-P No. 4782 and FERM-P No. 5316 respectively and at the American Type Culture Collection, Rockville, Md., USA under ATCC Nos. 31533, 31615, 31535, 31573, 31572, and 31598 respectively.
The mycological characteristics thereof are as follows:
1. Morphological Properties
The strain OBB-111 (FERM-P No. 4780, ATCC 31533) and the strain OBB-731 (FERM-P No. 5402; ATCC 31615) form moderately long aerial mycelium from substrate mycelium. Hooks or spirals are observed to develop at the apex of the aerial mycelium, but no whorls are formed. Mature spore chains with more than 10 spores per chain are usually produced. The spores are cylindrical, measure 0.5 to 0.6.mu..times.0.3 to 1.0.mu. and their surface is smooth.
The strain FR-401 (FERM-P No. 4882, ATCC 31535) forms aerial mycelium, branched like tufts, from substrate mycelium. Spirals are observed to develop, but no whorls are formed. Mature spore chains with more than 10 spores per chain are usually produced. The spores are cylindrical or ellipsoidal, mreasure 0.6 to 0.8.mu..times.0.8 to 1.2.mu. and their surface is smooth.
The strain AC-628 (FERM-P No. 4783; ATCC 31573) developed abundantly aerial mycelia from substrate mycelia. The aerial mycelia formed spirals, but whorl formation was not recognized. Mature spore chain was generally more than 10 spores per chain. The spore was of 0.6.about.1.0.mu.1.0.times.1.4.mu. in diameter, cylindrical in shape and its surface was smooth.
The strain AC-180 (FERM-P No. 4782; ATCC 31572) only poorly developed aerial mycelia from substrate mycelia. The aerial mycelia formed were straight to flexuous. Neither spiral nor whorl formation was observed. Mature spore chain was generally more than 10 spores per chain. The spore was of 0.4.about.0.6.times.0.8.about.1.2.mu. in diameter, cylindrical in shape and its surface was smooth.
2. Culture Characteristics on Various Media
The culture characteristics of strains OBB-111, OBB-731, FR-401, AC-628 and AC-180 are shown in Table 1.
3. Physiological Characteristics
The physiological characteristics and carbohydrate utilization of the strains OBB-111, OBB-731, FR-401, AC-628 and AC-180 are shown in Table 2 and Table 3, respectively.
TABLE 1.__________________________________________________________________________Culture characteristics on various mediaMedium Strain OBB-111 Strain FR-401 Strain AC-628 Strain OBB-731 Strain__________________________________________________________________________ AC-180Sucrose-nitrateagarGrowth dull orange [4pe, brown [6ni, Taupe colorless.about. pale yellow.about.pale pink [6gc, Dusty Coral] Orange Rust] Brown].about.pale pale orange yellowish brown .about.dull purple [9le, reddish orange [3gc, Light Tan] Raspberry] [6ie, Redwood]Aerial brownish gray [3cb, pinkish white light gray brownish gray [3cb, noneMycelium Sand].about.pale orange [6ge, Rose Gray] [2fe, Covert Sand].about.pale orange [5cb] [5cb] Gray]Diffusible reddish reddish none yellowish reddishPigmentGlucose-asparagineagarGrowth dull orange [3pe, Topaz pale orange yellowish gray dull orange [3pe, brownish gray [3li, .about.3ne, Topaz] [4ge, Rose Beige] [2ec, Oatmeal] Topaz.about.3ne, Topaz] Beaver].about.dark yellowish brown [3pn, Cepla Brown]Aerial light brownish gray none none light brownish gray noneMycelium [3dc, Natural] [3dc, Natural]Diffusible brownish brownish none brownish brownishPigmentGlycerol-asparagineagarGrowth pale yellow.about.pale dull reddish orange light reddish pale yellow [3gc, Light grayish red [7pi, Dark yellowish brown [3gc, [5le, Rust Tan.about.5ne orange [5pa, Tan].about.pale yellowish Wine].about.dark brownish Light Tan.about.31c, Amber] Tile Red] Brite Orange] brown [3lc, Amber] purple [7pn, Dark Rose dull reddish Brown] orange [5ne, Tile Red]Aerial light gray [2fe, light gray [2fe, light gray light gray [2fe, Covert pale pink [7cb, CloudMycelium Covert Gray] Covert Gray] [2fe, Covert Gray] Pink.about.7ec, Rose Mist] Gray.about.3fe, Silver Gray]Diffusible none brown reddish yellow brownishPigmentStarch-inorganicsalts agar(ISP medium No. 4)Growth pale yellow [2pc, Brite grayish yellow [3ec, yellowish gray pale yellow [2pc, Brite light brown [4ng, Light Gold].about.dull yellow Bisque].about.pale [2ec, Oatmeal] Gold].about.dull yellow Brown].about.dark brown [2pe, Mustard Gold] yellowish brown .about.light reddish [2pe, Mustard Gold] [4pn, Dark Brown] [3ge, Lt Tan] orange [5pa, Brite Orange]Aerial light brownish gray light brownish gray light gray light brownish gray pale pink [7ba, PinkMycelium [2dc, Natural].about.light [3dc, Natural] [3fe, Covert [2dc, Natural].about.light Tint].about.pink [7ca, Pale gray [2fe, Covert Gray] Gray] gray [2fe, Covert Gray] Pink]Diffusible yellow brownish brownish yellow brownPigmentTyrosine agar(ISP medium No. 7)Growth dark brownish gray brownish violet brown [5ni, dark brownish gray brown [5ni, Cocoa [3ni, Clove Brown] [4pe, DK Spice Cocoa Brown] [3ni, Clove Brown] Brown].about.dark brown Brown] .about.dull reddish [5nl, Dark Brown] orange [5le, Rust Tan]Aerial none light gray [3fe, light gray none pale pink [7ba, PinkMycelium Silver Gray] [3fe, Covert Tint] Gray].about.light brownish gray [5fe, Ashes]Diffusible black brown brown black dark brownPigmentNutrient agarGrowth colorless.about.pale brown colorless.about.pale pale brown colorless.about.pale pale brown [4ge, brown [3ie, Camel] Light Fawn]Aerial none none none none noneMyceliumDiffusible none none none brown nonePigmentYeast extract-maltextract agar(ISP medium No. 2)Growth yellowish brown pale yellowish dull red yellowish brown dull red [7ng, Old Wine] [3ng, Yellow Maple] brown [3ie, Camel] [5ie, Copper [3ng, Yellow Maple] .about.dark brownish purple Tan].about.reddish [8pl, Cordvan] brown [5ng, Brick Red]Aerial light gray [2fe, light gray [2fe, light brownish light gray [2fe, brownish gray [3cb,Mycelium Covert Gray] Covert Gray].about.light gray [5fe, Covert Gray] Sand] brownish gray [3dc, Ashes.about.7fe, Natural] Ashes]Diffusible none none brownish none brownPigmentOatmeal agar(ISP medium No. 3)Growth pale yellowish brown pale yellowish pale brown pale yellowish brown dark red [6pi, Brown [2gc, Bamboo].about.pale brown [3ie, Camel] [4gc, Nude Tan] [2gc, Bamboo].about.pale Mahogany].about.dark brownish brown [3ie, Camel] .about.pale reddish .about.reddish brown [3ie, Camel] purple [6pn, Dark Brown brown [4ge, brown [6ng, Mahogany] Nude Tan] Brick Red]Aerial light gray [2fe, Covert light grayish light gray light gray [2fe, Covert noneMycelium Gray.about.3fe, Silver Gray] reddish brown [2fe, Covert Gray.about.3fe, Silver Gray] [5fe, Ashes] Gray].about.dark gray [3ih, Beige Gray]Diffusible brown red reddish brown reddishPigmentSkimmed milk (37.degree. C.)Growth brown.about.dark brown brown.about.dark brown pale brown brown.about.dark brown colorless.about.pale brown .about.brownAerial white.about.brownish gray none none white.about.brownish noneMyceliumDiffusible dark brown dark brown dark brown dark brown nonePigmentGlucose peptonegelatin stabGrowth pale yellow colorless colorless.about.pale pale yellow colorless.about.pale yellowish yellowish brown brownAerial none none yellowish gray none noneMyceliumDiffusible brown brown brown brown faint brownishPigment__________________________________________________________________________
TABLE 2.__________________________________________________________________________Physiological characteristics of the 5 strains OBB-111, OBB-731 Methods and MaterialsTest FR-401 and AC-6288 AC-180 Used__________________________________________________________________________Gelatin moderate weak liquefaction glucose-peptone-liquefaction liquefaction gelatin medium: 27.degree. C.Starch weak to moderate moderate hydrolysis starch-inorganichydrolysis hydrolysis salts agarPeptonisation moderate to strong strong coagulation 10% skimmed milk;and coagulation peptonisation and and weak 37.degree. C.of skimmed milk no coagulation peptonizationNitrate positive negative ISP medium No. 8;reduction 27.degree. C.Melanin positive positive ISP medium No. 1formation ISP medium No. 6 ISP medium No. 7__________________________________________________________________________
TABLE 3.______________________________________Carbohydrate utilization OBB-111, OBB-731 FR-401 and AC-6288 AC-180______________________________________L-Arabinose positive positiveD-Xylose positive positiveGlucose positive positiveD-Fructose positive positiveSucrose positive positiveInositol positive positiveL-Rhamnose positive positiveRaffinose positive positiveD-Mannitol negative positive______________________________________ Basal medium: PridhamGottlieb medium (ISP medium No. 9) Temperature: 27.degree. C.
The foregoing characteristics of strains OBB-111, OBB-731, AC-628 and FR-401 can be summarised as follows: The strains belong to the genus Streptomyces. The aerial mycelium forms spirals at the apex but no whorls. The surface of the spores is smooth. The growth on various media is found to be pale yellowish brown to pale brown or dull orange, and the aerial mycelium is light grey. The strains produce reddish to brown diffusible pigment and melanin on various media. Among known species of Streptomyces, strains OBB-111, OBB-731, AC-628 and FR-401 resemble Streptomyces galilaeus (Reference 1: Archiv fur Mikrobiologie, 31, 356, 1958. Reference 2: The Actinomycetes, 2, 215, 1961. Reference 3: International Journal of Systematic Bacteriology, 22, 298, 1972) and Streptomyces galilaeus MA 144-M1, FERM-P No. 2455 (Reference 1: Japanese Patent Publication No. 34915/1976). The differences between the present strains and the standard strains of S. galilaeus ISP 5481 and S. galilaeus MA 144-M1 (FERM-P No. 2455) were investigated by parallel cultures. The results are shown in Table 4 hereinafter.
TABLE 4______________________________________ OBB-111, S. galilaeus OBB-731, MA 144-M1 FR-401 and S. galilaeus (FERM-P No. AC-628 ISP 5481 2455)______________________________________Liquefaction of moderate weak to weak togelatin moderate moderateCoagulation of negative weak negativemilk positiveDiffusible dark brown light brown dark brownpigmentChange of colourof growth by 0.05Nsodium hydroxidesolution:ISP medium No. 3 pink to -- pink to violet violetISP medium No. 4 slight pink -- slight pink .about.violet .about.violetISP medium No. 5 violet slight violet violet______________________________________
From the results, the present strains are very similar to S. galilaeus ISP 5481 and S. galilaeus MA 144-M1 (FERM-P No. 2455) in morphology and colour of the growth and mycelium on various media, chromogenicity and utilization of carbohydrates, although some differences were observed. We, therefore, concluded that OBB-111 (FERM-P No. 4780), OBB-731 (FERM-P No. 5402), FR-401 (FERM-P No. 4782) and AC-628 (FERM-P No. 4783) belong to a species of Streptomyces galilaeus and named Streptomyces galilaeus OBB-111, OBB-731, FR-401 and AC-628, respectively.
On the other hand, strain AC-180 (FERM-P No. 4782), belonging to genus Streptomyces, developed straight to flexuous aerial mycelia, though poorly. The spore surface was smooth. Growth was dark brown to dark brownish purple and developed poorly aerial mycelia of pale pink on ISP Medium 2, 4, 5 and 7, however no aerial mycelium was formed on sucrose nitrate agar, glucose asparagine agar, nutrient agar and ISP Medium 3. Reddish to brownish pigment was produced in various agar media. Melanoid pigment was produced in ISP-Medium 1, 6 and 7. In carbon utilization test, abundant growth was seen with L-arabinose, D-xylose, glucose, D-fructose, inositol, L-rhamnose, raffinose and D-mannitol. Sucrose seemed probably utilized. With skimmed milk test, both coagulation and peptonization were observed. Starch hydrolysis and gelatin liquefaction were positive, while nitrate was not reduced to nitrite.
When all the above properties were compared with known species of Streptomyces, it was found that many features of AC-180 (FERM-P No. 4782) were common with strain Streptomyces malanogenes (Int. J. Syst. Bact., 18, p. 348, 1968; J. Antibiot., Tokyo Ser. A, 10, 138.about.142, 1957). Thus a comparative study was undertaken with Streptomyces melanogenes IFO 12890 by parallel culture, the results of which are summarized in Table 5. The strain AC-180 (FERM-P No. 4782) differed from Streptomyces melanogenes IFO 12890 strain in L-rhamnose utilization and the color of reverse side (AC-180 (FERM-P No. 4782) was purplish color strong) on ISP-Medium 5. However, these differences were small in balance with other great similarities in morphology cultural and physiological properties. Thus, we concluded that strain AC-180 (FERM-P No. 4782) should be reasonably a species of Streptomyces melanogenes and identified Streptomyces melanogenes AC-180.
TABLE 5.______________________________________Comparison of strain AC-180with Streptomyces melanogenes IFO 12890 AC-180 St. melanogenes (FERM-P No. 4782) IFO 12890______________________________________Morphology of aerial straight to flexuous straight tomycelium flexuousColor of aerial mycelium red to gray color red to gray series color seriesCondition of aerial none or scant moderatemyceliumReverse side color dark brown to dark brown to dark(on ISP-Medium 5) brownish purple brownSoluble pigment reddish to brownish brownishSkimmed milkCoagulation + +Peptonization + +Gelatin liquefaction + +Nitrate reduction - -Carbon utilizationL-arabinose ++ ++D-xylose ++ ++Glucose ++ ++D-fructose ++ ++Sucrose + +Inositol ++ ++L-rhamnose ++ -Raffinose ++ ++D-mannitol ++ ++______________________________________
Streptomyces galilaeus OBB-111-848 (FERM-P No. 5316; ATCC 31598) is the strain derived from Streptomyces galilaeus OBB-111 (FERM-P No. 4780, ATCC 31533) by the following method.
The spores of an agar slant culture of Streptomyces galilaeus OBB-111 (FERM-P No. 4780, ATCC 31533) were suspended in 10 ml of sterile physiological saline solution and filtered through a glass filter No. 3. The spores were resuspended and diluted 2-fold with 0.2 M tris buffer (pH 9.0) containing 2 mg/ml of N-methyl-N'-nitro-N-nitrosoguanidine and incubated at 27.degree. C. for 60 minutes. Then the spores were collected on the Nucleopore filter (0.2 .mu.m pore size), washed with 30 ml of sterile physiological saline solution and resuspended in 10 ml of sterile physiological saline solution. The spore suspension thus obtained was spread on the ISP-No. 2 medium in a Petri dish and incubated at 27.degree. C. for 4.about.6 days. The colonies were picked up and transferred to an agar slant and incubated for 10.about.14 days. The strains thus obtained were tested for production of auramycinone and sulfurmycinone glycosides according to the following procedure.
The spores of each strain was inoculated into 10 ml of the medium in a test tube consisting of 2% glucose, 2% soluble starch 1% Pharmadmeia (Traders Oil Mill Co., U.S.A.), 0.1% K.sub.2 HPO.sub.4, 0.1% MgSO.sub.4.7H.sub.2 O, 0.3% NaCl and 0.3% CaCO.sub.3 and cultured for 4 days at 27.degree. C. on a reciprocal shaker. The culture broth was extracted with 20 ml of a solvent mixture of chloroform and methanol (1:1, v/v) and chloroform layer recovered. After concentration to dryness, the extract was dissolved in 0.5 ml of chloroform and analyzed on silica gel tlc plates developed with toluene/methanol (10:1).
Streptomyces galilaeus OBB-111-848 (FERM-P No. 5316; ATCC 31598) was selected as a non-producer of anthracycline pigments.
The microorganism can be used in a form of the culture broth, mycelia or enzyme. The culture broth can be prepared by inoculating a suitable medium with the microorganism. The culture medium can contain carbon sources, nitrogen sources, inorganic salts and other nutrient substances suitable for the growth of the microorganisms. Preferred carbon sources are glucose, sucrose, dextrin, mannose, starch, lactose, glycerol and the like. The nitrogen sources are, for example, nitrogen-containing organic substances such as peptone, meat extract, yeast extract, corn steep liquor, casein and the like, or nitrogen-containing inorganic compounds such as nitrates and inorganic ammonium salts. Examples of inorganic salts are phosphates or sodium, potassium, manganese, magnesium, iron copper salts and the like.
The cultivation of the microorganism may be carried out as a submerged culture, as a shaking culture or as a stationary culture. In a preferred embodiment, the microorganism is cultured under aerobic conditions.
The process provided by the present invention is conveniently carried out by adding an anthracycline glycoside B to the cultivated culture broth. The concentration of the anthracycline glycoside B conveniently is up to 1 g/l. The corresponding anthracycline glycoside A can be obtained by continuing the incubation of the microorganism under the aforementioned conditions. The incubation time can vary depending on the microorganism used, on the composition of the culture medium, on the anthracycline glycoside B used and on its concentration. However, in general, an incubation time of several hours suffices. The cultivation temperature generally lies between 20.degree. C. and 30.degree. C. Furthermore, the cultivation is conveniently carried out at a pH of 5 to 7.
The anthracycline glycisode B can be added to the culture of the microorganism during the cultivation or to the culture medium prior to sterilization or inoculation.
The transformation product can be isolated from the fermentation mixture in a manner known per se; for example, by solvent extraction with an organic solvent such as chloroform, methanol, and the like, and/or by chromatography on a carrier such as silica gel, aluminium oxide and the like. The product can be also purified by recrystalization from an organic solvent.
According to another aspect of preferred embodiment of the process provided by the present invention, the reaction can be carried out in the presence of the mycelium isolated from the culture broth of the microorganism or an enzyme extract prepared in a manner known per se from the culture broth or the mycelium, in a solution, for example, a buffer solution, in physiological salt solution, in fresh nutrient solution or in water.

The following Examples illustrate the present invention:
EXAMPLE 1
100 ml of sterilized medium in a 500 ml Erlenmeyer flask were inoculated with a slant of Streptomyces galilaeus OBB-111-848 (FERM-P No. 5316, ATCC 31598). The composition of said medium is as follows: glucose 2%, soluble starch 2%, Pharma Media (Traders Oil Mill Co., U.S.A.) 1% K.sub.2 HPO.sub.4 0.1%, MgSO.sub.4.7H.sub.2 O 0.1%, NaCl 0.3% and CaCO.sub.3 0.3%. The flask was incubated at 27.degree. C. for 3 days on a rotary shaker operating at 180 rpm.
2 ml of the culture thus obtained were seeded into each of three 500 ml flasks containing 100 ml of medium with the same composition as mentioned above. After cultivation at 27.degree. C. for 3 days, to each flask were added 5 mg of aclacinomycin B, auramycin B or sulfurmycin B dissolved in 2 ml of methanol and the flasks were further incubated. After 1, 3 and 7 hours, 5 ml aliquots were removed from each flask and extracted with chloroform/methanol (1:1, v/v); and the extract was analyzed on thin layer chromatographic plates developed with a solvent mixture of toluene and methanol (10:1, v/v).
The results are shown in Table 6
TABLE 6______________________________________Reaction Products {(A/A + B) .times. 100}time Aclacinomycin A Auramycin A Sulfurmycin A______________________________________1 hr. 22.5% 20.4% 23.3%3 hr. 47.8 40.7 40.07 hr. 63.2 75.0 81.3______________________________________
EXAMPLE 2
100 ml of sterilized medium in a 500 ml Erlenmeyer flask were inoculated with a slant culture of Streptomyces galilaeus OBB-111-848 (FERM-P No. 5316, ATCC 31598). The composition of said medium is as follows: glucose 2%, soluble starch 2%, Pharma Media (Traders Oil Mill Co., U.S.A.) 1%, K.sub.2 HPO.sub.4 0.1%, MgSO.sub.4.7H.sub.2 O 0.1%, NaCl 0.3% and CaCO.sub.3 0.3%. The flask was incubated at 27.degree. C. for 3 days on a rotary shaker operating at 180 rpm.
5 ml of the culture thus obtained were transferred into each of three 500 ml flasks containing 100 ml of medium with the same composition as mentioned above. After cultivation at 27.degree. C. for 2 days, the cells were collected by centrifugation and distributed into three 500 ml flasks containing 5 mg of aclacinomycin B, auramycin B or sulfurmycin B in 100 ml of sterilized saline solution. The flasks were incubated at 27.degree. C. on a rotary shaker.
After 1, 3 and 7 hours, 5 ml aliquots were removed and extracted with chloroform/methanol (1:1, v/v); and the extract was analyzed by high pressure liquid chromatography.
The results thereof are shown in Table 7.
TABLE 7______________________________________Reaction Products (A/A + B) .times. 100time Aclacinomycin A Auramycin A Sulfurmycin A______________________________________1 hr. 35.5% 38.2% 41.7%3 hr. 48.8 52.9 55.87 hr. 58.8 65.0 68.2______________________________________
EXAMPLE 3
In a manner analogous to that described in Example 2, using cinerubin B, 1-hydroxyauramycin B and 1-hydroxysulfurmycin B respectively, there were obtained the conversion ratios of 40%, 43% and 45%, respectively.
EXAMPLE 4
In a manner analogous to that described in Example 2, using Streptomyces galilaeus FR-401 (FERM-P No.4882; ATCC 31535) instead of the strain OBB-111-848, the conversion ratio of aclacinomycin B into aclacinomycin A was 79% after 5 hours.
EXAMPLE 5
In a manner analogous to that described in Example 2, using Streptomyces galilaeus AC-628 (FERM-P No. 4783; ATCC 31573) and Streptomyces melanogenes AC-180 (FERM-P No. 4782, ATCC 31572) respectively, instead of the strain OBB-111-848, the conversion ratios of cinerubin B into cinerubin A after 5 hours were 10% and 30%, respectively.
EXAMPLE 6
In a manner analogous to that described in Example 2, using Streptomyces galilaeus OBB-111 (FERM-P No. 4780, ATCC 31533) instead of Streptomyces galilaeus OBB-111-848, the conversion ratios of aclacinomycin B, auramycin B and sulfurmycin B into aclacinomycin A, auramycin A and sulfurmycin A after 7 hours were 64%, 69% and 73%, respectively.
EXAMPLE 7
The slant culture of Streptomyces galilaeus OBB-111-848 (FERM-P No. 5316, ATCC 31598) was inoculated into 100 ml of medium containing glucose 2%, soluble starch 2%, Pharma Media (Traders Oil Co., U.S.A.) 1%, K.sub.2 HPO.sub.4 0.1%, MgSO.sub.4.7H.sub.2 O 0.1%, NaCl 0.3%, and CaCO.sub.3 0.3% in a 500 ml Erlenmeyer flask and cultivated at 27.degree. C. for 3 days on a rotary shaker operating at 180 rpm. 5 ml of the culture thus obtained were transferred into each of fifteen 500 ml Erlenmeyer flasks containing 100 ml of medium with the same composition as mentioned above and incubated for further 2 days under the same condition.
The culture was centrifuged at 8,000 rpm to harvest the cells. The cells were distributed into fifteen flasks containing 100 ml of sterilized saline solution with 5 mg of sulfurmycin B. The flasks were incubated at 27.degree. C. on a rotary shaker at 180 rpm for 7 hours.
The reaction mixture was centrifuged at 8,000 rpm for 10 minutes to separate the cells from the supernatant. The cells were extracted with 1 l of the solvent mixture of chloroform and methanol (1:1, v/v), to which 500 ml of water were added to separate chloroform layer. On the other hand, the supernatant was extracted with the equal volume of chloroform. The extracts were combined and evaporated to dryness and dissolved in toluene, to which was added silica gel. The suspension was shaken overnight at room temperature.
The silica gel was collected by filtration and extracted with chloroform/methanol (5:1, v/v). The extract was evaporated to dryness under reduced pressure and dissolved in a small amount of chloroform. The purification was performed by thin layer chromatography on silica gel 60, F.sub.254 (Merck Co.) with the solvent system toluene/methanol (10:1), whereby 39 mg of sulfurmycin A were obtained as yellow powder.
EXAMPLE 8
In a manner analogous to that described in Example 7, using auramycin B instead of sulfurmycin B, there were obtained 39 mg of auramycin A as yellow powder.
EXAMPLE 9
In a manner analogous to that described in Example 7, using Streptomyces galilaeus OBB-111-848 and aclacinomycin B instead of sulfurmycin B, there was obtained 50 mg of aclacinomycin A.

Process to produce anthracycline glycosides

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Journal of Antibiotics, vol. 32, pp. 472-481, (May 1979).
Umezawa et al, The Journal of Antibiotics, (Japan), vol. 28, No. 10, pp. 830-835, (Oct. 1975).