Glycopeptide antibiotics pa-45052

Abstract: Glycopeptide antibiotics PA-45052 of the following structure, which are produced by Nocardia orientalis PA-45052, show potent activity against gram-positive bacteria, especially against methicillin-resistant bacteria and stimulate growth of animals.

Description: This invention relates to PA-45052 antibiotics which are represented by the following formula; (wherein R is or H and R₁ denotes H.), their pharmaceutically acceptable salts, their production, organisms producing them and a growth-stimulating agent containing at least one of them. As antibiotics have recently become widely used, the emergence of multiple drug-resistant bacteria, especially methicillin-resistant bacteria causes severe problems. The methicillin-resistant bacteria show resistance not only to methicillin but also to various antibiotics such as aminoglycosides, tetracyclines, cephems, penicillins, carbapenems and macrolides. It was noticed that glycopeptides, especially vancomycins, show activity against methicillin-resistant bacteria (Antimicrobial Agent and Chemotherapy, 28 , 660-662 (1985)). Vancomycin is a well-known antibiotic ( Japanese Patent Publication No. 33-8450) and novel analogs of vancomycin have been developed (Antimicrobial Agent and Chemotherapy, 28 , 660-662 (1985), Journal of Antibiotics, 37 , 446-453 (1984), 38 , 1-8 (1985), 38 , 51-57 (1985), Japanese Laid-open Patent No. 60-139623, 60-199397, 60-231698, 60-237099 etc.). On the other hand, the present inventors found that a strain belonging to the genus Nocardia produces vancomycin antibiotics PA-42867-A and PA-42867-B having potent antibacterial activity ( Japanese Patent Application No. 61-14389) and, in addition, created derivatives thereof (Japanese Patent Application No. 61-188865). The PA-45052 antibiotics of the present invention are vancomycins having completely new structures not coincident to those of the above compounds. It is well known that glycopeptide antibiotics such as vancomycins stimulate growth in animals (for example, Japanese Unexamined Patent Publication Nos. 57-129693, 59-213394, 59-213395, 60-199397, 60-231698, 60-237099, 61-122300, 61-251699, 62-126970 and 61-502335; U.S. Patent Nos. 4537770 and 4558036; European Patent Publication No. 119575 etc.). However, it was not known that the compounds of this invention have growth-promoting activity. Now, thiopeptin is on the market as a growth-stimulating agent. EP-A-265 071 is prior art pursuant to Article 54(3) EPC. This document relates to novel glycopeptide antibiotics of the vancomycin group and to a method for the preparation of said antibiotics. In particular, this document relates to antibiotic A82846. EP-A-201 251 relates to glycopeptide derivatives having antibacterial activity and to methods for preparing these compounds. In particular, this document discloses on page 6 of the description the structural formula of these glycopeptides. EP-A-231 111 is prior art under Article 54(3) EPC and relates to glycopeptide antibiotics, their preparation and use in microorganisms for producing them. In particular, this document discloses the microorganism Nocardia orientalis PA-42687 (FERM BP-1320) for the preparation of these glycopeptides. The problems of infections caused by methicillin-resistant bacteria have become serious clinically and it is known that glycopeptide antibiotics, especially vancomycin antibiotics are effective against them. The technical problem underlying this invention is to provide novel vancomycin antibiotics having antibacterial and growth stimulating activity. This invention provides glycopeptide antibiotics PA-45052-B and -C, which are produced by culturing Nocardia orientalis PA-45052 and show potent activity against gram-positive bacteria, especially methicillin-resistant bacteria and stimulate growth in animals. Fig. 1 shows infrared absorption spectra of PA-45052-B and PA-45052-C. Fig. 2 represents spectra of mass analysis of PA-45052-B and PA-45052-C (peaks marked by # are those of standard substances for marker correction), and Fig. 3 shows ¹H-NMR spectra of PA-45052-B and PA-45052-C. According to the present invention the strain PA-45052 belonging to the genus Nocardia produces compounds which are represented by the following formula; (wherein R is or H and R₁ is H.) and which have strong antibacterial activity, and named a compound of which R in the formula is and R₁ is H as PA-45052-B, named a further compound of which R is H and R₁ is H as PA-45052-C. The present invention includes not only these compounds but also their pharmaceutically acceptable salts. PA-45052 described in this specification means mainly any one of the above two compounds but in some cases specifies all of these compounds. The physicochemical properties of the compounds of this invention are shown below. The terms PA-45052-B (HCl) and PA-45052-C (HCl) denote that all of them are hydrochlorides. · Physicochemical properties Ultraviolet absorption spectrum PA-45052-B (HCl) PA-45052-C (HCl) Specific rotation PA-45052-B (HCl) PA-45052-C (HCl) Infrared absorption spectrum IR (KBr) cm⁻¹ (See Fig. 1) PA-45052-B (HCl) 3392, 1665, 1589(sh), 1505, 1423, 1400, 1332, 1231, 1132, 1064, 1015, 892, 848 PA-45052-C (HCl) 3392, 1665, 1624(sh), 1603(sh), 1515, 1501(sh), 1430, 1399, 1233, 1133, 1060, 1002, 889, 848 Mass spectrometry (SIMS) (See Fig. 2) PA-45052-B (Free) 1448 (M + H)⁺ PA-45052-C (HCl) 1286 (M + H)⁺ Elementary analysis PA-45052-B (HCl) Anal. Calcd. for C₆₆H₇₅O₂₄N₉Cl₂ · HCl · 5H₂O (%): C; 50.21, H; 5.68, N; 7.98, Cl; 6.74 Found (%): C; 50.38, H; 5.60, N; 8.13, Cl; 6.75 PA-45052-C (HCl) Anal. Calcd. for C₆₀H₆₅O₁₉N₉Cl₂ · 2HCl · 6H₂O (%): C; 49.09, H; 5.42, N; 8.59, Cl; 9.66 Found (%): C; 49.14, H; 5.49, N; 8.76, Cl; 9.88 Nuclear magnetic resonance spectrum ¹H-NMR [400MHz, d₆-DMSO (internal TMS)] {ppm} (See Fig. 3) PA-45052-B (free) [temp. 100°C] 8.40 (br), 8.29 (d, 6.5), 8.04 (d, 8.5), 7.88 (d, 1.8), 7.52 (dd, 8.4, - 2), 7.40 (br-s-like), 7.34 (br-d, 8.4), 7.27 (d, 8.4), 7.23 (br), 7.15 (d, 2.2), 6.80 (dd, 8.4, 2.2), 6.71 (d, 8.4), 6.45 (br), 6.39 (d, 2.2), 6.38 (d, 2.2), 5.96 (br-d, - 11), 5.73 (s-like), 5.71 (br-d, - 8.5), 5.36 (d, 7.4), 5.23 (s-like), 5.20 (s-like), 5.14 (d, 4.0), 4.76 (d, 4.0), 4.67 (d, 4.2), 4.52 (d, 6.5), 4.50 (d, - 6.5), 4.35 (br-m), 4.23 (br-d, - 11), 3.71 (d-like, 11.5), 3.62 (q-d, 6.0, 9.7), 3.55 (dd, 11.5, 4.5), 3.44 (t-like), 3.13 (t-like), 3.1 (m), 2.86 (d, 9.7), 2.55 (dd, 16, 7.2), 2.32 (s), 2.17 (dd, 16, 7.2), 1.90 (br-d, 13.5), 1.77 (m), 1.61 (dd, 13.5, 4.2), 1.52 (m), 1.42 (m), 1.17 (d, 6.0), 1.13 (s), 0.92 (d, 6.5), 0.89 (d, 6.5) PA-45052-C (HCl) [temp. 100°C] 8.63 (br), 8.37 (d, 5.8), 7.96 (br-d, - 8.5), 7.80 (br), 7.59 (br-d, - 8.5), 7.36 (br), 7.33 (br), 7.30 (br), 7.19 (br), 7.18 (br-s-like), 6.84 (br-d-like, - 8.5), 6.57 (d, - 8.5), 6.43 (d, 2.3), 6.33 (d, 2.3), 5.62 (s-like), 5.57 (br), 5.23 (s-like), 5.21 (br), 5.18 (s-like), 4.87 (br), 4.76 (d, 4.0), 4.57 (d, 5.8), 4.50 (d, 5.8), 4.27 (d, 12.0), 3.63 (q-d, 6.1, 9.5), 3.28 (br-d, - 9.7), 2.51 (not clear), 2.39 (s), 2.25 (not clear), 1.77 (m), 1.61 (m), 1.49 (m), 1.48 (br), 1.23 (d, 6.1), 0.92 (d, 6.5), 0.90 (d, 6.5) Thin-layer chromatography Merck pre-coated TLC plate silica gel 60F254 Developing solvent Chloroform : methanol : concentrated ammonia water : secondary butanol : water (5 : 10 : 5 : 5 : 2) PA-45052-B (HCl) Rf = 0.22 PA-45052-C (HCl) Rf = 0.26 High performance liquid chromatography (HPLC) Column : Cosmosil 5Ph ⊘ 4.6 x 150 mm (Nakarai Chemicals, Ltd.) Detection : UV 220 nm Flow rate : 1 ml/min. Mobile phase : 10% acetonitrile-0.05M phosphate buffer (pH 3.5) PA-45052-B (HCl) Retention time : 9.2 min. Mobile phase : 17% acetonitrile-0.05M phosphate buffer (pH 3.5) PA-45052-C (HCl) Retention time : 8.8 min. Column : Nucleosil 5C8 ⊘ 4.6 x 150 mm (Chemco) Detection : UV 220 nm Flow rate : 1 milliliter/min. Mobile phase : 10% acetonitrile-0.05M phosphate buffer (pH 3.5) PA-45052-B (HCl) Retention time : 8.8 min. Mobile phase : 17% acetonitrile-0.05M phosphate buffer (pH 3.5) PA-45052-C (HCl) Retention time : 7.6 min. Coloration : Positive in ninhydrin reaction Solubility : Soluble in water and dimethylsulfoxide, slightly soluble in methanol and ethanol and insoluble in ether, benzene, chloroform and ethyl acetate Properties : Amphoteric matter, white noncrystalline powder From the above physicochemical properties, the compounds PA-45052 of this invention are supposed to have the following steric structures. (Wherein R is and R₁ is H.) As described above, compounds PA-45052 have different properties to the known glycopeptide antibiotics, thus they are novel glycopeptide antibiotics. The PA-45052 strain is exemplified as one of the PA-45052 producing organisms, which is isolated from a soil sample. The strain was identified to be of the same species as Nocardia orientalis from a taxonomic consideration, and it has been deposited with Fermentation Research Institute (1-3, Higashi 1 chome Tsukuba-shi Ibaraki-ken, 305 Japan) since March 26, 1987 as Nocardia orientalis PA-45052 (FERM BP-1320). Here, the PA-45052 producing organism in this specification means a strain producing at least one of the compounds PA-45052-B and -C. Mycological properties of the strain are as follows. 1) Morphological Properties This strain grows well in yeast malt agar, tyrosine agar and Bennett's agar medium and the aerial hyphae adhere to it favorably and the sporulation is satisfactory. The branches are simple without verticillate branches. The aerial hyphae are relatively long and their tips are straight or wavy. According to the observation under an electron microscope, the spores have an elliptic cylindrical form of 0.3 to 0.5 µm in width and 1.2 to 1.8 µm in length, and the surface structure is smooth. Neither sporangia, flagellous spores nor sclerotia can be observed. 2) Propertoes on media (14-day cultivation at 28°C) Growth temperature (Cultivated on Bennett's agar medium for 14 days at the following temperatures) 10°C: No growth 28°C: Preferable to growth, formation of aerial hyphae and sporulation 37°C: Preferable to growth, aerial hyphae were slightly formed. 45°C: No growth 3) Physiological descriptions (28°C, 14-day cultivation) Melanoid chromogenic ability Negative Tyrosinase reaction Negative Coagulation of milk Negative Peptonization of milk Positive Liquefaction ability of gelatin Positive Hydrolytic ability of starch Negative 4) Utilization of carbon sources Sugars used well in the growth L-arabinose, D-xylose, D-glucose, D-fructose, sucrose, inositol, rhamnose, D-mannitol Sugars not used in the growth Raffinose 5) Composition of the cell wall Diaminopimelic acid is of meso form. From the above properties, the strain is judged to be a strain belonging to the genus Nocardia . Searching for a closely related species to this strain from "The Actinomycetes" (Waxman, vol. 2, 1961), "International Journal of Systematic Bacteriology" [Report of International Streptomyces Project, Shirling and Gottlieb, vol. 18 (1968), vol. 19 (1969), vol. 22 (1972)], Bergey's Manual of Determinative Bacteriology (8th edition, 1974) and other materials related to Actinomyces , it was found that Nocardia orientalis (described as Streptomyces orientalis in the following materials: International Journal of Systematic Bacteriology vol. 18, pp. 154 - 157, 1968, The Actinomycetes vol. 2, pp. 254 - 255, 1961) was the closest species. When comparing the properties of Nocardia orientalis with those of the PA-45052 strain, most of the principal properties coincided well except for this utilization of sucrose. Accordingly, a PA-45052 strain was identified to be the same species as Nocardia orientalis , and was named Nocardia orientalis PA-45052. All strains belonging to the genus Nocardia and producing PA-45052-B and -C, as well as said PA-45052 strain and its natural or artificial variants, can be used and are included in the scope of this invention. PA-45052 are produced by cultivating a PA-45052-producing strain in a nutrition medium under aerobic conditions and recovering PA-45052 from the cultures after the cultivation. General production of PA-45052 is described hereinbelow. As for components and conditions of the medium, those generally used in the production of antibiotics may be employed. The medium, in principle, contains a carbon source, a nitrogen source and inorganic salts. Vitamins and precursors may be added as required. Carbon sources, for example, glucose, starch, dextrin, glycerol, molasses and organic acid are used solely or as a mixture. And nitrogen sources, for example, soybean powder, corn steep liquor, meat extract, yeast extract, cottonseed powder, peptone, wheat germ, ammonium sulfate and ammonium nitrate are used solely or as a mixture. In addition, known inorganic salts, for example, calcium carbonate, sodium chloride, potassium chloride, magnesium sulfate, copper sulfate, manganese chloride, zinc sulfate, cobalt chloride and phosphates, are added to the medium as required. The cultivation may be performed by conforming to the method generally used for the production of antibiotics, preferably a liquid culture, and for the purpose of mass production, a submerged aeration culture is suitable. In case the pH of the medium might vary, a certain buffer such as calcium carbonate may be added to the medium. The cultivation should be carried out at about 20 to 40°C preferably at 25 to 32°C. The cultivation period depends on the scale of fermentation, and 5 to 7 days are required in mass production. When brisk bubbles are formed during the cultivation, it is better to properly add an antifoam such as vegetable oil, lard and polypropylene glycol before or during the cultivation. In order to recover the PA-45052 from the culture after the cultivation, methods ordinarily used in recovering fermented matter are appropriately used. It is better to properly combine, for example, filtration, centrifugation, adsorption or desorption and chromatography using a variety of ion exchange resins and other activated adsorbents, and extraction by a variety of organic solvents. For the purpose of isolation or for the convenience of using them as medicines for humans or animals, it is sometimes preferable to make PA-45052 salts. The bases capable of forming salts with PA-45052 are alkaline metals such as potassium and sodium, alkaline earth metals such as magnesium or aluminum, while for acids, inorganic acids such as hydrochloric acid, sulfuric acid, and nitric acid, and organic acids such as acetic acid and fumaric acid are exemplified. PA-45052 and their pharmaceutically acceptable salts can be administered orally or parenterally to men or animals as the active components of an antibacterial agent. They can be administered orally as tablets, capsules or powders by using widely employed vehicles, stabilizers, preservatives, humectants and surfactants, and on the other hand, they can be administered parenterally as injections, liniments and suppositories. The dose differs much depending on the purpose of therapy, age of the patient and symptoms, but basically 0.1 to 10 g a day is preferable for an adult by intravenous injection. The compounds PA-45052 of the present invention show strong antibacterial activity against Gram-positive bacteria especially methicillin-resistant bacteria and, therefore, are effective as drugs for both men and animals. Besides, as they can be obtained at a high purity, they are suitable to be used as injections as well as oral drugs. Furthermore, the present inventors found that the compounds PA-45052 have potent activity against the genus Clostridium and animals show remarkable growth when they are fed with a feed to which the PA-45052 is added. The growth-stimulating agent of this invention, though the glycopeptides of this invention themselves may be orally administered, is generally administered as a mixture with usual carriers such as defatted rice bran, defatted bean powder, wheat bran, kaolin, talc, calcium carbonate, lactose, water etc. or a feed or water containing said mixture or the glycopeptides themselves is preferably administered. The glycopeptides used therein need not to be pure; for example the partially purified culture of the microorganism of the present invention is applicable. Further, pharmaceutically acceptable salts of the glycopeptides of this invention are also applicable; for example, salts with alkali metal such as potassium and sodium, alkaline earth metals such as magnesium or aluminum, inorganic acid such as hydrochloric acid, sulfuric acid and nitric acid and organic acid such as acetic acid and fumaric acid. A feed containing one or more glycopeptides of this invention may be any one generally used as a feed for animals; for example, the mixture of the whole or a part of corn, wheat bran, rice, wheat, cotton seed cake, milo, soy bean cake, fish powder, defatted rice bran, oil, alfalfal, calcium carbonate, calcium phosphate, sodium chloride, choline chloride, vitamines such as vitamin A, vitamin D, vitamin E, vitamin B₁, vitamin B₂, vitamin B₆, vitamin B₁₂, calcium pantothenate, nicotinamide and folic acid and inorganic acids such as magnesium sulfate, iron sulfate, copper sulfate, zinc sulfate, cobalt sulfate and potassium iodide. Other than these, another antibiotic, germicide, anticoccidium and anthelminthic may be added. The concentration of one or more of the glycopeptides of this invention in a feed may be 0.5 to 100 ppm if using them alone, as a mixture of them, cells containing them or crude extract containing them. The growth-stimulating agent of this invention may generally be administered to any animals, for example, poultry such as chicken, turkey, duck and quail and cattle such as cow, horse, pig, sheep, goat, mink and rabbit. In using the growth-stimulating agent of this invention animals may be fed according to methods generally used. The growth-stimulating agent of this invention not only promotes growth of animals but also improves feed efficiency. Naturally, it is effective against infections by bacteria. Moreover, it has excellent characteristics in that it has little virulence to animals and does not accumulate in animals. The LD₅₀ values of the present compounds after injection into mice are shown below. LD₅₀ (mg/kg) PA-45052-B 1439 Referential Example The antimicrobial activity of the PA-45052 of this invention was investigated on against Clostridium perfringens in vitro and the growth-stimulating activity to broiler chicks. 1. In vitro test on Clostridium perfringens A total of 11 strains of Cl. perfringens derived from cows and chicken were used. In measuring the sensitivities, GAM agar medium (Nissui) was used as assay medium and anaerobic culture (the gas pack method) was performed according to the agar plate dilution method. The MIC value was defined as the minimal concentration at which a visual inhibition of the bacteria was clearly observed after incubation at 37°C for 24 hours. It has been reported that antibacterial activity against gram positive bacteria, especially Cl. perfringens is one of the parameters of the growth-stimulating activity of antibiotics in in vitro screening (Poultry Science 62 , 1633-1638, 1983; Poultry Science 63 , 2036-2042, 1984). The results are shown below. In vitro activity of PA-45052 against Cl. perfringens Strain Origin MIC (µg/ml) PA-45052-B PA-45052-C NCTC-10239 cow 0.2 0.1 FC 2208/75 cow 0.39 0.1 S-79 cow 0.39 0.1 CW-1970 cow 0.39 0.2 6B-10 cow 0.39 0.2 NCTC-8239 cow 0.2 0.2 NCTC-8798 cow 0.39 0.2 SP07 chicken 0.2 0.1 9C-02 chicken 0.39 0.2 3C-01 chicken 0.78 0.2 02441 chicken 0.39 0.2 2. Growth-stimulation test to chick The growth-stimulating activity of PA-45052-B to broiler chicks(arbor acre, 8 days old) was investigated by using the known antibiotic thiopeptin as a reference agent. Chicks were fed with a feed mush (crude protein (CP) concentration 18%, each agent's concentration 20 ppm, not supplemented with other antibiotics) for 14 days in the battery brooders. The method of this experiment was as follows. After chicks were fed in a floor pen with a feed (CP concentration 23%) from 0 to 8 days, they were divided into 5 groups (24 chicks a group, male and female each 12 chicks) in such a way that the average weight of the groups are equal. To each group PA-45052-B (20 ppm), thiopeptin (20 ppm) or only a feed (CP 18%) was administered for 14 days. Each group was fed in cages (435 × 600 × 410 mm, each cage has 6-7 chicks.) at 26 ± 2 °C for 14 days (up to 22 days old). Effectiveness was estimated from the increase in weight and the feed efficiency. The results are as follows. EXAMPLE The present invention is detailed in the examples, which, however, are not intended to limit this invention. (a) Fermentation process: To a 2-liter Erlenmeyer flask charged with 800 ml of culture medium composed of 0.5% soluble starch, 0.5% glucose, 0.5% polypeptone, 0.5% meat extract, 0.25% yeast extract, 0.25% salt and deionized water (pH 7.0, before sterilization), a seed culture slant of Nocardia orientalis PA-45052 (FERM BP-1320) is inoculated and cultured for 48 hours at 28°C with shaking at 180 rpm. Each 800 ml of this culture solution is transplanted into a 50-liter jar fermenter charged with 30 liters of culture medium composed of 3.6% dextrin, 2.4% molasses, 0.84% bactopeptone, 0.12% L-tyrosine, 0.05% antifoam P-2000 (produced by Dai Nippon Ink & Chemicals Inc.) and water (pH 7.0, before sterilization), and it is cultured at 32°C for 137 hours under aeration of 30 liters/min, inner pressure of 0.35 kg/cm²G with stirring at 550 rpm. (b) Isolation process: The culture solution obtained in the above process is adjusted to pH 10.5 with 10% sodium hydroxide and 33 liters of supernatant are obtained by centrifugation. After adjusting this supernatant to pH 7.5, it is applied to a 3.3 liter HP-20 column (manufactured by Mitsubishi Chemical Industries, Ltd.). The column is washed with 23 liters of water and then with 10 liters of 15% methanol-0.005N hydrochloric acid and eluted with 50% methanol-0.005N hydrochloric acid. Fractions (9 liters) which show activity in the pulp disk diffusion method using Bacillus subtilis are combined and adjusted to pH 7. The fractions are concentrated in vacuo and freeze-dried to obtain 46.3 g of a crude powder of PA-45052. (c) Purification process: · Preparation of PA-45052-A, -B and -C Ten grams of said crude powder are suspended in 100 ml of water and dissolved in 1N hydrochloric acid to adjust the pH to 2.0. The suspension is applied to 100 ml of MCI GEL CHP-20P (produced by Mitsubishi Chemical Industries, Ltd.), which is eluted with 0.01 N hydrochloric acid, 10% methanol-0.01 N hydrochloric acid, 25% methanol-0.01 N hydrochloric acid in this order while checking the content in the fraction by HPLC, and is divided into fractions containing PA-45052-A and -B and a fraction containing PA-45052-C. The fraction containing PA-45052-A and -B is adjusted to pH 6.0, concentrated and applied to 100 ml of CHP-20P, which is eluted with water, 30% methanol-water, 50% methanol-water in this order while checking the content by HPLC to obtain a fraction containing PA-45052-A and a fraction containing PA-45052-B. The fraction containing PA-45052-A is adjusted to pH 7.0 and concentrated. After applying it to a Packed Column RQ-2 (Fujigel Hanbai Co., Ltd.), it is eluted with 13% acetonitrile-0.05 M phosphate bufferred solution (pH 7.0) (abbreviated to PBS hereinafter) and successively with 15% acetonitrile-0.05 M PBS (pH 7.0) while checking the purity by HPLC. And after combining the PA-45052-A fractions (HPLC purity 95% or more), the mixture is concentrated and applied to 12 ml of CHP-20P, which is washed with water and eluted with 50% methanol-water. The resultant eluate is adjusted to pH 4.0, concentrated and freeze-dried to obtain 198 mg of PA-45052-A (HCl). The fraction containing PA-45052-B is adjusted to pH 7.0, concentrated and applied to a Packed Column RQ-2, which is eluted with successive, 8% acetonitrile-0.05 M PBS (pH 3.5) and 10% acetonitrile-0.05 M PBS (pH 3.5) while checking the purity by HPLC. After combining the PA-45052-B fractions (HPLC purity 95% or more), the mixture is adjusted to pH 7.0, concentrated and applied to 12 ml of CHP-20P, which is washed with water and eluted with 50% methanol-water. As it is colored, the solution is again adjusted to pH 7.0, concentrated, then adjusted to pH 4.0 and applied to 2 ml of CHP-20P, which is eluted with 0.001 N hydrochloric acid to decolor it. Then, fractions of PA-45052-B are collected, adjusted to pH 7.0 and concentrated. The resultant solution is applied to 12 ml of CHP-20P, which is washed with water and eluted with 50% methanol-water. The resultant solution is concentrated, adjusted to pH 4.0 and freeze-dried to obtain 290 mg of PA-45052-B (HCl). The fraction containing PA-45052-C is adjusted to pH 8.5 and adsorbed to 100 ml of CHP-20P, which is washed with water and 50% methanol-water and eluted with 50% methanol-0.01 N hydrochloric acid. After combining and concentrating the fractions containing PA-45052-C, the solution is applied to a Packed Column RQ-2, which is eluted with successive, 15% acetonitrile-0.05 M PBS (pH 3.5) and 18% acetonitrile-0.05 M PBS (pH 3.5) while checking the purity by HPLC. And after combining the PA-45052-C fractions (HPLC purity 90% or more), the solution is adjusted to pH 8.0, concentrated and applied to 12 ml of CHP-20P, which is eluted with 18% acetonitrile-0.05 M PBS (pH 7.0) successively with 21% acetonitrile-0.05 M PBS (pH 7.0) while checking the purity by HPLC. In addition, after combining the fractions of PA-45052-C (HPLC purity 95% or more), the solution is concentrated and applied to 12 ml of CHP-20P, which is washed with water, desalted and eluted with successive, 50% methanol-water and 50% methanol-0.01 N hydrochloric acid. The eluate is concentrated, adjusted to pH 2.5 and freeze-dried to obtain 365 mg of PA-45052-C (HCl). · Preparation of PA-45052-D Twenty grams of the crude powder of PA-45052 as described above are suspended in 140 ml of water and dissolved in 1 N hydrochloric acid to adjust the pH to 2.0. This solution is applied to 100 ml of MCI GEL CHP-20P (Mitsubishi Chemical Industries, Ltd.), which is eluted with 0.01 N hydrochloric acid while checking the fractions by HPLC. Fractions containing PA-45052-B and -D are adjusted to pH 6.4, concentrated and applied to CHP-20P (100 ml), which is eluted again with 0.01 N hydrochloric acid to obtain a fraction containing PA-45052-B and -D. The fraction containing PA-45052-B and -D is adjusted to pH 7.0 and concentrated, then applied to a Packed Column RQ-2 (Fujigel Hanbai Co., Ltd.), which is eluted with successive, 0.05 M PBS (pH 7.0), 13% CH₃CN-0.05 M PBS (pH 7.0), 15% CH₃CN-0.05 M PBS (pH 7.0), 18% CH₃CN-0.05 M PBS (pH 7.0) and 30% CH₃CN-0.05 M PBS (pH 7.0). From the eluate with 30% CH₃CN-0.05 M PBS (pH 7.0), a fraction containing PA-45052-D is obtained. The fraction containing PA-45052-D is concentrated and adsorbed to MCI GEL CHP-20P (10 ml), which is washed with water and eluted with successive, 25% CH₃OH-H₂O and 50% CH₃OH- H₂O. Desalted fractions are combined and concentrated. After being adjusted to pH 4.0 with hydrochloric acid, it is freeze-dried to obtain PA-45052-D (665 mg, hydrochloride salt) as white noncrystalline powder. · Preparation of PA-45052-E Twenty grams of the crude powder of PA-45052 as described above are suspended in 140 ml of water and dissolved in 1N hydrochloric acid to adjust the pH to 2.0. This solution is applied to 100 ml of MCI GEL CHP-20P (Mitsubishi Chemical Industries, Ltd.), which is eluted with 0.01 N hydrochloric acid, 10% methanol-0.01 N hydrochloric acid and 25% methanol-0.01 N hydrochloric acid in this order. By checking the fractions by HPLC, a fraction containing PA-45052-A, -B, -D and -E and a fraction containing PA-45052-C and -F are obtained. The fraction containing PA-45052-A, -B, -D and -E is adjusted to pH 6.4 and concentrated, then applied to CHP-20P (100 ml), which is eluted again with 0.01 N hydrochloric acid to obtain a fraction containing PA-45052-A and a fraction containing -B, -D and -E. The fraction containing -B, -D and -E is adjusted to pH 7.0, concentrated and applied to a Packed Column RQ-2 (Fujigel Hanbai Co., Ltd.), which is eluted with successive, 0.05 M PBS (pH 7.0), 13% CH₃CN-0.05 M PBS (pH 7.0), 15% CH₃CN- 0.05 M PBS (pH 7.0), 18% CH₃CN-0 .05 M PBS (pH 7.0) and 30% CH₃CN- 0.05 M PBS (pH 7.0). From the eluate with 30% CH₃CN-0.05 M PBS (pH 7.0), a fraction containing -D and a fraction containing -E are obtained. The fraction containing PA-45052-E is concentrated and adsorbed to MCI GEL CHP-20P (10 ml). After being washed with water, it is eluted with 25% CH₃OH-H₂O and 50% CH₃OH-H₂O in this order. The fractions containing -E are then combined and concentrated. After being adjusted to pH 4.0 with hydrochloric acid, it is freeze-dried to obtain PA-45052-E (245 mg, hydrochloride salt) as white noncrystalline powder. · Preparation of PA-45052-F The fraction containing PA-45052-C and -F is adjusted to pH 8.0 and adsorbed to CHP-20P (100 ml). After being washed with water and 50% methanol solution, it is eluted with 50% methanol-0.01 N hydrochloric acid. Fractions containing PA-45052-C and -F are concentrated and applied to a Packed Column RQ-2, which is eluted with 15% CH₃CN-0.05 M PBS (pH 3.5) and 18% CH₃CN-0.05 M PBS (pH 3.5) to obtain a fraction containing PA-45052-C and -F. The fraction containing PA-45052-C and -F is adjusted to pH 8.0 and concentrated, and sequentially applied to CHP-20P (10 ml), which is eluted with 18% CH₃CN-0.05 M PBS (pH 7.0), 21% CH₃CN-0.05 M PBS (pH 7.0), 30% CH₃CN-0.05 M PBS (pH 7.0) and 50% CH₃CN-0.01 N hydrochloric acid in this order to obtain a fraction containing PA-45052-C and a fraction containing PA-45052-F. The fraction containing PA-45052-F is concentrated and adsorbed to CHP-20P (10 ml), which is washed with water to be desalted and then eluted with 50% methanol solution and 50% methanol-0.01 N hydrochloric acid. After being concentrated, it is adjusted to pH 2.5 and freeze-dried to obtain 30 mg of PA-45052-F (hydrochloride salt). Example 2 (a) Fermentation process: To a 2-liter Erlenmeyer flask charged with 800 ml of culture medium composed of 0.5% soluble starch, 0.5% glucose, 0.5% polypeptone, 0.5% meat extract, 0.25% yeast extract, 0.25% salt and deionized water (pH 7.0, before sterilization), a seed culture slant of Nocardia orientalis PA-45052 (FERM BP-1320) is inoculated and cultured for 48 hours at 28°C with shaking at 180 rpm. This culture solution (800 ml) is transplanted to a 30-liter jar fermenter charged with 18 liter of culture medium composed of the same ingredients as the above and cultured under the conditions of 18 liters/min of aeration, 0.35 kg/cm²G of inner pressure, 200 rpm of stirring speed, at 32°C for 23 hours. Then, 8 liters of this culture is transplanted to a 250-liter fermentation tank charged with 165 liter of a culture medium composed of 2.0% potatostarch, 1.0% glucose, 3.0% molasses, 1.1% bactopeptone, 0.05% antifoam P-2000 (manufactured by Dai Nippon Ink and Chemicals) and water (pH 7.0 before sterilization) and is cultured at an aeration rate of 165 liters/min, inner pressure of 5 psi, at stirring speed of 350 rpm at 32°C for 164 hours. (b) Isolation process: The culture solution obtained in the above process is adjusted to pH 10.5 with 10% sodium hydroxide and 140 liters of the supernatant is obtained by centrifugation. After adjusting this supernatant to pH 7.5, it is applied to a 15 liter HP-20 column (produced by Mitsubishi Chemical Industries). Then, after washing with 23 liters of water and then with 30 liters of 15% methanol-0.005 N hydrochloric acid, it is eluted with 50% methanol-0.005 N hydrochloric acid. Then 53 liters of fractions showing the activity by the pulp disk diffusion method using Bacillus subtilis are collected and adjusted to pH 7. Finally, this mixture is concentrated in vacuum and freeze-dried to obtain 150.8 g of crude powder of PA-45052. 6) Effects of the invention In vitro antibacterial activity was determined by the agar dilution method as described below. 1 ○ Preparation of Bacterial Suspension One loopful of each test bacterium on a slant was inoculated into 1 ml of a growth medium (Trypto Soy Broth, Eiken Chemical Co.) and incubated at 37°C for 18-20 hours. For the growth of Streptococci , Mueller-Hinton broth (Difco) supplemented with 3%(V/V) horse serum was employed. A hundred-fold dilution of the culture was used as an inoculum suspension of the bacterium. 2 ○ Sample Solution The sample (9-10 mg) was weighed and dissolved in distilled water at a concentration of 2 mg/ml. 3 ○ Agar Plate A sample solution was subjected to serial two fold dilutions with sterile water (2000-0.25 µg/ml). To sterile plastic petri dishes (9 cm in diameter) 0.5 ml-aliquot of sample solutions was poured, which was mixed with 9.5 ml of an agar medium (Sensitivity Test Agar, "Nissui"). For Streptococci , horse serum was supplied at 0.5%(V/V). 4 ○ Measurement of MIC Value One loopful (1.0 µl) of the inoculum suspension was placed on the surface of the agar plates prepared as noted above. The bacterial growth was examined visually after overnight incubation (18-20 hrs) at 37°C. The lowest concentration, at which bacterial growth is completely inhibited, is defined as MIC (minimal inhibitory concentration). The results are shown in Table 1. The antibacterial activity of PA-45052-B and -C in vivo is next shown in Table 2. Test method: The test organism is intraperitoneally inoculated to Slc-ICR female mice (8 mice per group), and PA-45052-B or -C (two-fold dilution) is subcutaneously administered twice one hour later and 5 hours later. Results: The 50% effective dose (ED₅₀) is calculated from the survival rate on day 7. Test organism ED₅₀ (mg/kg/dose) PA-45052-B PA-45052-C Staphylococcus aureus SR 3637 2.84 3.39 Staphylococcus aureus SR 2030 1.45 1.91 Streptococcus pneumoniae Type I 0.38 0.29 Streptococcus pyogenes C-203 0.44 0.35 Example 3 Addition of each compound as a growth-stimulating agent of this invention is exemplified below. (1) corn 46.45 % milo 15.00 % soy bean cake 5.00 % fish powder 3.00 % defatted rice bran 25.00 % alfalfal 3.00 % calcium carbonate 1.00 % calcium phosphate 0.70 % sodium chloride 0.40 % mixture of vitamins A, D and E 0.05 % mixture of inorganic salts 0.1 % mixture of vitamins B 0.1 % PA-45052-A 10 ppm (2) corn 41.00 % milo 25.00 % soy bean cake 19.10 % fish powder 8.00 % oil 4.00 % calcium carbonate 1.40 % calcium phosphate 0.85 % mixture of vitamins and inorganic salts 0.26 % methionine 0.10 % sodium chloride 0.29 % PA-45052-B 20 ppm (3) corn 78 % soy bean cake 9 % fish powder 10 % oil 3.9 % crude fiber 2.4 % crude ash 5.1 % calcium carbonate 1.07 % calcium phosphate 0.73 % mixture of alfalfal meal, sodium chloride and calcium carbonate 3 % PA-45052-B 20 ppm (4) One or more of PA-45052 are mixed in a similar way to the above to prepare an agent-supplemented feed.

Claims: A compound PA-45052 represented by the formula: (wherein R is or H and R₁ is H) and its pharmaceutically acceptable salts. The compound PA-45052-B of Claim 1, wherein R is and R₁ is H. The compound PA-45052-C of Claim 1, wherein R is H and R₁ is H. Process for the production of PA-45052 which comprises cultivating a PA-45052-producing organism which belongs to the genus Nocardia in a medium and recovering the PA-45052 from the cultured medium. The process of Claim 4, wherein said organism belongs to Nocardia orientalis species. The process of Claim 4, wherein said organism is Nocordia orientalis PA-45052. Use of an organism belonging to the genus Nocardia for producing the compound PA-45052. Use according to Claim 7, wherein the organism belongs to the Nocardia orientalis species. Nocardia orientalis PA-45052, FERM BP-1320. A growth-stimulating agent for an animal which contains one or more compounds of Claims 1 to 3 as an active ingredient.

Inventors: HAYASHI YOSHIYUKI, KAMIGAUCHI TOSHIYUKI, KAWAMURA YOSHIMI, KOBAYASHI MASAAKI, KONDO EIJI, KONISHI TAKAO, MATSUMOTO KOICHI, TSUJI NAOKI, HAYASHI, YOSHIYUKI, KAMIGAUCHI, TOSHIYUKI, KAWAMURA, YOSHIMI, KOBAYASHI, MASAAKI, KONDO, EIJI, KONISHI, TAKAO, MATSUMOTO, KOICHI, TSUJI, NAOKI
Applicants: SHIONOGI & CO, SHIONOGI SEIYAKU KABUSHIKI KAISHA TRADING UNDER THE NAME OF  SHIONOGI & CO. LTD.
Application year: 1988
Main classification: C07K9
IPC codes: C12P21, C07K9