NZ230352A

NZ230352A - 2,3-dihydroxypropanoic (glyceric) acid derivatives and their preparation

Info

Publication number: NZ230352A
Application number: NZ230352A
Authority: NZ
Inventors: Werner Aretz; Dirk Bottger; Gerhard Seibert; Alois Tumulka; Peter Welzel; Kurt Hobert
Original assignee: Hoechst Ag
Priority date: 1988-08-20
Filing date: 1989-08-18
Publication date: 1991-07-26
Also published as: DK407789A; GR3019332T3; NO893327L; AU8835391A; JPH1171323A; NO893327D0; EP0355679A2; AU3998589A; PT91469B; PT91469A; EP0355679A3; KR900003361A; AU619034B2; DK407789D0; IL91354A0; ZA896310B; JPH02150273A; FI893878A; PH26511A; ATE134641T1

Abstract

It is possible with the aid of a Bacillus species or the appropriate enzymes obtained therefrom to degrade phosphoglycolipid antibiotics. The degradation products of the moenomycins have antibiotic activity or can be used as building block in the synthetic preparation of transglycosylase inhibitors.

Description

<div id="description" class="application article clearfix"> New Zealand Paient Spedficaiion for Paient Number £30352 o -r^' - • -rt« O ZZ0Z52 NO DRAWINGS Priority Date(s):. 2^>- z- ■=&%■ Complete Specification Filed: Class: Publication Date: . IMJSL P.O. Journal, No: N.Z NEW ZEALAND Patents Act 1953 COMPLETE SPECIFICATION A new microorganism for breaking down moenomycins, a process for the breakdown, and the use of the breakdown products © He, HOECHST AKTIENGESELLSCHAPT, D-6230 Frankfurt am Main 80, Federal Republic of Germany, a corporation organized under the laws of the Federal Republic of Germany do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- - 1 - (Followed by 1A) 23 0 3 521 nODOIIGT AKOIIDIiOBCDUiDOIIMUD Diiinn/ga HOD 00/r BSD Description A new microorganism for breaking down moenomycins, a process for the breakdown, and the use of the breakdown products Mbenomycin A (Fig. 1) is the main component of Flavomycin® which is used in livestock nutrition. Like other known phosphoglycolipid antibiotics it inhibits the biosynthesis of the peptidoglycan framework of the bacterial cell wall. Closer investigations showed that the transglycosylation reaction of the penicillin-binding protein lb of E. coli is inhibited by these substances [Huber 6., Antibiotics, V-l, pages 135 to 153 (1979)]. Attempts at specific enzymatic or microbial breakdown of phosphoglycolipid antibiotics have hitherto failed. Surprisingly, a new Bacillus species which is able to cleave the phosphoglycolipid antibiotics to defined end products has now been isolated from a contaminated fermenter for the preparation of flavomycin using Streptomyces ghanaensis. These end products have antibiotic activity or can be used as building blocks in the synthesis of new transglycosylase inhibitors. Hence the invention relates to: 1. Bacillus spec. DSM 4675 and the variants and mutants thereof. 2. The cleavage product of moenamycin A with the formula I 23035? - 2 - UC 3. The cleavage product: of the phosphoglycolipid antibiotics with the general formula R^-O-C^-CH-OR2 COOH (II) in which R1 is hydrogen or a phosphono group [-P0(0H)2] and R2 is a (C5 to C55)-alkyl group which can be branched or unbranched, saturated or unsaturated. 4. The enzymes with whose aid the phosphoglycolipid antibiotics cem be cleaved at the phosphoglycosidic linkage, or the cleavage products specified under 3. can be cleaved at the monophosphate ester linkage. 5. A process for the preparation of the breakdown products specified under 2. and 3., which comprises incubating phosphoglycolipid antibiotics with Bacillus spec. DSM 4675. 6. The use of the substances specified under 2. and 3. as building block for the synthetic preparation of transglycosylase inhibitors or as substance having antibiotic activity. The invention will be described in detail hereinafter, especially in the preferred embodiments. It is furthermore defined in the claims. e . 230352 o - 3 - Bacillus spec, was deposited with the number DSH 4675 under the provisions of the Budapest Treaty at the Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH (German Microorganism and Cell Culture Collection) 5 in Braunschweig, FRG, on June 23, 1988. The characteristics of the strain may be said to be the following: 1. Taxonomic properties of Bacillus sp. DSM 4675 ^ A) Morphology —/ - motile rods; up to 5 /m long; some in short 10 chains - terminal spore; sporangium swollen - Gram-positive. B) Growth on various aedia (28"C; 48 hours) 1. Antibiotic medlwm 3 (Difco) 15 - rough, lobed colonies of diameter 1-2 mm 2. Luria broth (Bacto tryptone 10 g/1; Bacto yeast 5 g/1; NaCl 5 g/1 - smooth, glossy round colonies of diameter 2-3 mm; opaque CD 20 3. Nutrient broth (Difco) - white, glossy colonies with irregular margin 4. Christens en urea agar (Difco) _ - growth positive 5. McConkey agar (Difco) 25 - growth positive 6. BRQIiAC agar (lactose) (Difco) - growth positive 7. Simmons citrate agar (Difco) - growth negative 23 0 3 - 4 - 8. No growth in the presence of 7 or 10 % NaCl in a peptone/meat extract medium (Difco) C) Physiological properties 1. Oxidase + 2. Catalase + 3. Hemolysis - 4. Aminopeptidase 5. Nitrate reduction - 6. Phenylalanine deaminase - 7. Growth at 30*C + 40#C + 50°C + 8. Anaerobic growth - solid - - liquid - 9. Gas formation from glucose - 10. Indole formation 11. Arginine dihydrase - 12. Urea breakdown 13. Esculin hydrolysis + 14. Gelatin breakdown 15. 0-Galactosidase 'tis. Lysine decarboxylase - 17. Ornithine decarboxylase 18. H2S production 19. Tryptophan deaminase 20. Alkal. phosphatase 21. Voges-Proskauer reaction - D) Fermentation of carbohydrates C source Assimilation Acid formation Adipate Adonitol Arabinose Caprate Citrate 230352 C source Assimilation Acid formation Dulcitol — Fructose + + Galactose — Gluconate + Glucose + + Inositol — Lactose + + Malate - Malonate — Maltose + + Mannitol + + Mannose + + Melibiose + + Phenylacetate - Raffinose + + Rhamnose — Sucrose + + Salicin - Sorbitol — Trehalose + + Xylitol — - Xylose + + N-Acetyl-glucosamine — + Taking account of taxonamic features and with the aid of "Bergey's Manual of Systematic Bacteriology" (Vol. 2, Williams and Wilkins publ., Baltimore, 1986) the strain can be assigned to the genus Bacillus. To determine the species, parallel comparative examinations of type cultures of Bacillus macerans, circulans, lentus, alcalo-philus , stearothermophilus , licheniformi s , polymyxa and fastidiosus were carried out. All the comparison strains showed distinct differences from Bacillus spec. DSM 4675. Nor were any of these strains able to break down phosphoglycolipid antibiotics, especially moenomycin A. The conclusion to be drawn from this is that the strain DSM - 6 - 230 352 4675 is a new species. The invention also relates in each case to the mutants and variants which, as is known, may arise spontaneously or be generated by treatment with physical agents, for example irradiation, such as ultraviolet or X-rays, or with chemical mutagens such as, for example, ethyl me thane sulfonate (EMS), N-methyl-N' -nitro-N-nitrosoguani-dine (MNNG) or 2-hydroxy-4-methoxy-benzophenone (HOB). Suitable and preferred as carbon source for the aerobic fermentation of Bacillus spec. DSM 4675 are assimilable carbohydrates and sugar alcohols, such as glucose, lactose or mannitol, as well as carbohydrate-containing natural products such as malt extract. Suitable and preferred nitrogen-containing nutrients are: amino acids, peptides and proteins, as well as the breakdown products thereof, such as peptone or tryptone, furthermore meat extracts, milled seeds, for example of corn, beans, soybean or the cotton plant, disillation residues from the production of alcohol, meat meals or yeast extracts, as well as ammonium salts and nitrates. The nutrient solution may additionally contain, for example, chlorides , carbonates, sulfates or phosphates of the alkali metals or alkaline earth metals, iron, zinc and manganese as additional inorganic salts. The growth of the microorganism and the formation of the enzymes necessary for the breakdown reactions according to the invention is particularly good in a nutrient medium containing corn starch, soybean meal, sucrose, glycerol, peptone and/or com steep as carbon and nitrogen sources. The fermentation is carried out aerobically, that is to say, for example, submerged with shaking or stirring in shaken flasks or fermenters, where appropriate introducing or oxygen. The fermentation can take place in a temperature range from approximately room temperature to n i O o - 7 - 230352 50 °C, preferably at about 35 to 37°C. The culturing time is generally 24 to 48 hours. The cultures of Bacillus DSM 4675 obtained in this way, or preparations thereof, can be used to cleave the 5 phosphoglycolipid antibiotics. These include, in particular, the antibiotics of the moenomycin group, for example pholipomycin15, the prasinomycins2), the diumycins (macar-bomycins)3) esanchoxnycin, prenomycin emd teichoxnycin, and other structurally related substances which have a 10 correspondingly functionalized phosphoglyceric acid [1) S. Takahashi et al.. Tetrahedron Lett. 1983. 499 2) F.L. Weisenborn et al.. Nature 213. 1092 (1967) 3) S. Takahashi et al., J. Antibiot. 26. 542 (1973)]. The enzymes are particularly preferably used to break 15 down the moenomycins, for example Flavomycin. When Bacillus cells are used it is advantageous to permeabilize the latter, for example with cetyltrimethyl-ammonium salts. It is likewise possible to use protein isolates from the Bacillus cells, or enzyme extracts 20 which have been partially enriched, for example, by salting-out or chromatography or, of course, the purified enzyme. It is furthermore possible to employ the enzyme and cells in free or immobilized form. The enzymatic breakdown is depicted in the following 25 diagram using moenomycin A as an example. - 8 - 230352 Enzymatic breakdown of moenomycin A O Moenomycin A Hoenotuyc inase MA » 23 0 3 52 It is evident from this diagram that two enzymes are needed to prepare the cleavage products. An enzyme, which the inventors have called moenomycinase, is required to cleave the phosphoglycosidic linkage. MOenomycinase is 5 associated with the cytoplasmic membrane of Bacillus spec. DSM 4675 and can be obtained from the microorganism by enzyme isolation methods known per se. Moenomycinase has a pH optimum of about 8.0-8.5, in particular 8.2-8.3. The temperature optimum of the enzyme 10 is 45—55°C, in particular 49-51 °C. Moenomyc inase has a K„ value for moenomycin A of 4-10 millimolar. Two cleavage products are obtained. Cleavage product I comprises the sugar component of the phosphoglycolipid antibiotics. Also obtained is the cleavage product with 15 the general formula II R^-O-CHo-CH-OR2 2 I II COOH in which r1 is a phosphono group and R2 is a (C5 to C55)-alkyl group, preferably a (C10 to C30) -alkyl group, in particular a (C20 to C^)-alkyl, each of which can be 20 branched or unbranched, saturated or unsaturated, preferably branched and unsaturated. Moenomyc ins are preferably employed as substrates, so that the resulting cleavage products are the substances corresponding to the compound ISC, as well as the com-25 pounds MB and MA (see formula diagram). Another enzyme is required for the dephosphorylation of the phosphoglyceric acid lipid, which is obtained by incubation with moenomycinase, of the general formula II in which R1 is hydrogen, and can also be obtained from 30 the microorganism according to the invention. The inventors have called this enzyme MBase. MBase can likewise be isolated from the microorganism by methods known per se. For example, the cells are disrupted with ultrasound, and o 23 0 3! - 10 - the resulting crude extract is further enriched either by ammonium sulfate fractionation (25-55 % saturation) or ultracentrifugation. This is followed by dialysis. The moenomyc inase and MBase are finally separated by chroma-5 tography. The MBase is increasingly inactivated at temperatures above 37°C as well as when the pH falls in the acid pH range below pH 5. The cleavage of the moenomyc ins, as well as of the 10 phosphoglycolipid antibiotics can, as already mentioned, be carried out with whole cells or enzyme isolates. The reaction is generally carried out in aqueous medium at a pH of about 5.5-8.5, preferably pH 7-8. The reaction time is generally 5-48 hours, preferably about 24 hours. 15 The reaction temperature can be from 4 to 60°C, preferably 30 to 37 °C. The substrate concentration ought to be in the range from 0.1 to 5 %, preferably 1 to 2 %. It is still possible to carry out the reaction at temperatures or pH values which are higher or lower than 20 stated. However, the moenomyc inase is then less active. The reaction products resulting from moenomycin A are the substances MB and MC depicted in the diagram. The product MA can be obtained by incubation of MB with MBase at 30 to 37*C, preferably at 35 to 37 *C, and pH 5.5 to 8.5, 25 preferably pH 6 to 8, over a period of about 24 hours. The said reaction products can be used as antibiotic (for example MB) or as building block for the synthesis of transglycosylase inhibitors (for example MA and MC). 30 The invention is described in more detail by means of examples. Unless stated otherwise, percentage data relate to weight. a o o 230352 - 11 - Example 1 Maintenance of the Bacillus spec. DSM 4675 strain Bacillus spec. DSM 4675 is maintained on the following solid nutrient medium (medium 1): 5 Bacto tryptone (Difco) 10 g/1 Teast extract (Difco) 5 g/1 NaCl 5 g/1 Agar 15 g/1 pH 7.2 10 The medium is distributed over test tubes and sterilized at 121 °C for 30 minutes, then cooled, inoculated with the culture and incubated at 37°C for 2-3 days. The grown culture is rinsed off to provide the inoculum for the following, moenomyc in-containing main culture 15 (medium 2): O 20 O 25 Corn starch 40 g/1 Soybean meal 35 g/1 Sucrose 10 g/1 CaCOa 8 g/1 Corn steep 4 g/i CoS04 20 mg/1 ®Genapol (alkyl polyglycol ester 5 ml/1 Moenomycin A 3 g/1 pH 7.6 filtered) 300 ml Erlenmeyer flasks each containing 30 ml of this medium are inoculated and then incubated at 37 °C and 190 rpm for 8-48 hours. Analysis of the culture filtrate by thin-layer chromatography shows that the compounds MA, 30 MB and MC are detectable as cleavage products of moenomycin, and that towards the end of the reaction there has been complete disappearance of the moenomycin employed. 230352 - 12 - Example 2 Preparation of cell-free extracts To prepare cell-free extracts. Bacillus spec. DSM 4675 is cultured in a fermenter. For this, cells are rinsed off the agar plate to provide a 10 ml inoculum for a preculture (500 ml of medium 2 without Flavomycin in a 2 1 Erlenmeyer flask) which is then incubated at 37 °C and 190 rpm for 24 hours. A 12 1 laboratory fermenter containing 9 1 of medium 3 is used for the main culture stage: Peptone 12.5 g/1 Glycerol 20.0 tg/1 Citrate 2.0 g/1 KaHPO^ 1.5 g/1 MgS04 x 7H2O 0.5 g/1 FeCl3 x 6H20 0.04 g/1 Desmophen (propylene glycol) 5.0 ml/1 pH 6.8 This is inoculated with 500 ml of preculture and incubated at 37*C, 300 rpm and an aeration rate of 0.5 wm for 24 hours. The grown culture is centrifuged, and the cell paste is resuspended in potassium phosphate buffer (pH 7.0) 50 mM (1 g of wet cells + 2 ml of buffer). The cells are then disrupted with ultrasound, a French Press9 or Dyno Mill9, and the resulting crude extract is used for the conversion. In a test mixture containing 100 pi of crude extract, 12 mg of moenymycin and 900 pi of potassium phosphate buffer (pH 8.0) 50 mM there is within 7-24 hours at 37"C 50 % breakdown of the substrate employed. The reaction products found are MA, MB and MC. 230352 Example 3 Preparative conversion of moenomycin A Preparative conversions are carried out in a 12 1 fermenter containing 8.2 1 of potassium phosphate buffer (pH 8.0) 50 mM, 800 ml of crude enzyme extract and 100 g of moenomycin A at 37 °C and 100 rpm. The progress of the conversion is followed by TLC. The entire reaction mixture is freeze-dried after 8-48 hours. The moenomycin breakdown is generally 40-60 % (UV analysis from the TLC). The resulting reaction products are MA, MB and MC. Example 4 Preparation of the breakdown products 100 g of freeze-dried mixture from the enzymatic conversion were taken up in 2 1 of water and extracted twice with 2 1 of ethyl acetate each time. Centrifugation was necessary for complete phase separation in this case. The combined organic extracts were dried over sodium sulfate, filtered and evaporated to dryness. 0.4 g (0.4 %) of a dark brown oil was obtained, and thin-layer chromatography in the system n-butanol/acetic acid/water = 3/1/2 on silica gel (Merck 60 F254 aluminum TLC sheets), spraying with molybdatophosphoric acid/cerium (IV) sulfate color reagent (abbreviated to PMS reagent hereinafter), showed that it comprised mainly component MA (Rf value = 0.85). The remaining aqueous phase was then extracted twice with 2 1 of n-butanol each time. Once again, centrifugation was necessary for phase separation. The combined butanol phases were then concentrated as far as possible, and the residue was taken up in a little water and finally freeze-dried. 7.4 g (7.4 %) of a yellow powder were obtained and were found on examination by thin-layer chromatography (using the abovementioned conditions and 230352 the same detection) to comprise mainly the component MB (Rf = 0.52). The aqueous phase from which non-polar substances had been removed in this way was freeze-dried. The amount of residue resulting from this was 76.9 g (76.9 % with a total amount of 85 %). Thin-layer chromatography showed that this pale yellow powder was composed of a polar main substance, called MC (Rf = 0.1), remaining moenomycin A and by-products. The crude products of components MA, MB and MC obtained in this way were further purified as follows. Example 5 a) Purification of the breakdown product MA 400 mg of MA. crude product were chramatographed on 120 g of silica gel (Merck 60, 15 - 40 mem) which had been adjusted to a pH of 7.5. (The column material had been pre treated in the following way for this purpose: the silica gel was stirred in 500 ml of 2N HC1 for one hour, then filtered off with suction and washed to neutrality. The pH was then adjusted to 7.5 with IN NaOH, and finally washing with 2 1 of water and 500 ml of methanol was carried out. The material pretreated in this way was dried and activated at 120°C overnight.) Chloroform/eth-anol = 1/1 was used as eluent. The substance was loaded onto the column in 3 ml of solvent mixture, and 216 fractions each of 2.5 ml were collected. Using TLC analysis (TLC plates and detection as in Example 1, solvent system as for column eluent), fractions 115-175 were combined, dried on sodium sulfate and finally evaporated to dryness. 27 mg of spectroscopically pure MA were obtained. 23 0 352 b) Purification of -the breakdown product MB 3.1 g of MB-containing crude product from the extraction were chromatographed on 500 g of silica gel which had been adjusted to a pH of 7.5 using the process explained in Example 2. Using a medium-pressure chromatography system (MPLC), chloroform/ethanol/water = 4/7/1.5 was used for the elution at a flow rate of 10 ml/min and a pressure of 2-5 bar. After a fore-run of 600 ml, 220 fractions each of 10 ml were collected, combining on the basis of the TLC. Besides mixed fractions containing MB, fractions 90-170 yielded 1.28 g of pure MB after evaporation, taking up in water and freeze-drying. c) Purification of the breakdown product MC 2.2 g of polar crude product from the aqueous phase of the extraction were likewise chromatographed under pressure (MPLC). 500 g of silica gel with a pH of 7.5 were employed (process in Example 2), and the eluent used was ethyl acetate/i-propanol/water = 4/5/5. The amount to be loaded was suspended in methanol with 15 g of silica gel, the solvent was evaporated off, and the support treated in this way was introduced into a precolumn, and then elution was carried out at a flow rate of 5 ml/min under a pressure of 2-4 bar. A fore-run of 940 ml was followed by fractionation in 250 fractions each of 10 ml. The fractions were tested by thin-layer chromatography in the system ethyl acetate/i-propanol/water = 1/1/1 using PMS color reagent and detection of the UV absorption at 254 nm, and were combined. Besides mixed fractions, concentration of fractions 120-190 to the aqueous phase and subsequent freeze-drying revealed 1.3 g of pure MC, which was investigated by spectroscopy. Example 6 Blncidatxon of the structures of the products MA and MB obtained fm »oenonycin A by enzymatic breakdown. 23 0 352 - 16 - (The numbers of the structures relate to the formula diagram on page 19) The structure deduced for MA was la. The assignment of the structure is based on the UC NMR spectrum of la. Reaction of la with diazomethane yielded the methyl ester lb which is characterized by a *H NMR and an EI mass spectrum. The structure deduced for MB on the basis of 13C and FAB mass spectrum was 2. Hydrogenation of 2 yielded the decahydro derivative 3a which reacted with diazomethane to give 3b, which had already been obtained previously from moenomycin A by another route. It is consistent with the proposed structures that it was possible to convert 2 (MB) enzymatically into la (MA). Description of the experiments las "c NMR (100.6 MHz, CD3OD): moenocinol moiety: 6 = 67.5 (C-l), 123.5 (C-2), 141.6 and 141.8 (C-3 and C-7), 32.3 and 32.5 (C-4 and C-5), 126.7 (c-6), 35.9 (C-8), 40.9 (C-9), 30.7 (C-10), 151.1 (C-ll), 33.4 (C-12), 122.7 (C-13), 137.3 (C-14), 36.4 (C-15), 27.7 (C-16), 125.3 (C-17), 132.2 (C-18), 25.9 (C-19), 17.8 (C-20), 16.1 (C-21), 109.2 (C-22), 27.3 (C-23 and C-24), 23.8 (C-25). Glyceric acid moiety: 6 = 175.9 (C-l), 80.6 (C-2), 64.1 (C-3). CzaH^O, (446.6) lb: la was converted into the H* form in aqueous solution using *Dowex 50 (H* form), la (H* form, 18.5 mg, 0.04 xomol) was dissolved in methanol (3 ml) and, at 0*C, excess ethereal diazomethane solution was added. The reaction mixture was maintained at 0aC for 2 h and at 20°C for 12 h and then evaporated to dryness. Column chromatography (5 g of Si02, petroleum ether/ethyl acetate 2:1) yielded lb (3 mg). 230352 lH NMR (80 MHz, CDC13): 5 = 0.96 (s, 6H, CHa-23 and CH3-24), 1.61 (s, 6H), 1.68 (s, 3H), 1.73 (s, 3H) (4xCH3), 1.90-2.12 (allyl Hs), 2.62 (broad d, J = 7Hz, CH2-12), 3.78 (s, OCH3), 3.60-4.30 (CX^ and OCH signals), 4.62 (broad s, CH2-22), 4.87-5.47 (olefinic Hs). - C^H^O* (460.7), MS: m/z (%) = 460 (0.03), 271 (10), 230 (19), 199 (68), 43 (100). 2; UC NMR (100.6 MHz, D20): moenocinol moiety: s - 68.6 (C-1), 124.5 (C-2), 142.9 (C-3), 34.6 (C-4), 34.0 (C-5, C-10), 128.1 (C-6), 143.6 (C-7), 37.8 (C-8), 44.1 (C-9), 151.4 (C-ll), 37.2 (C-12), 123.5 (C-13), 138.3 (C-14), 42.2 (C-15), 29.1 (C-16), 126.9 (C-17), 133.1 (C-18), 28.0 (C-19), 19.9 (C-20), 18.2 (C-21), 111.2 (C-22), 29.7 (C-23, 24), 25.9 (C-25). Glyceric acid moiety: S = 179.0 (C-l), 81.8 (C-2), 68.6 (C-3). - (526.7), FAB-MS (matrix: DMSO/glycerol): m/z = 615 (M-3H+4Na)+, 593 (M-2H+3Na)+, 571 (M-H+2Na)+, 492, 267, 231, 185, 165, 143, 115. 2 (14.9 mg, 28.3 pmol) and Pt02 (4 mg) were stirred in methanol (3 ml) and acetic acid (50 /tl) in an ^ atmosphere under normal conditions for 3 days. The catalyst was filtered off, and evaporation yielded 3a (13.5 mg). - CssHstOjP (536.7), FAB-MS (matrix: DMSO/glycerol: m/z = 625 (M-3H+4Na)+, 603 (M-2H+3Na)+, 581 (M-H+2Na)+, 558 (M-H+Na)\ 514, 500, 498, 432, 404, 362, 340, 298, 288, 266, 186, 164, 142, 115, 93. 3a was treated in aqueous solution with the ion exchanger (Dowex 50, ft form) in order to liberate all acidic groups. The resin was filtered off and then the solution was freeze-dried. 8.5 mg (15.9 jimol) of the sample treated in this way were dissolved in methanol (2 ml). An excess of ethereal diazomethane solution was added at 0*C. The mixture was left to stand at 0aC for 2 h and at - 18 - 230352 20°C for 12 h. Evaporation and column chromatography (5 g of Si02, petroleum ether/ethyl acetate 1:1) yielded 3b (4.0 mg). *H NMR (80 20 MHz, CDC13): S = 3.75 (s, OCH3 and 2 d, 3Jh p = 10 and 12 Hz, P(0CH3)2), 3.20 - 4.40 (OCHj, and OCH multiplets), - (578.8), MS: m/z (%) = 563 (0.1, M-CH3), 519 (1, H-COOCH3), 452 (1, M-(CH30)2P(0)0H), 381 (3, M-C14H29, breakage of the link between C-8 emd C-9 of the 25 perhydromoenocinol moiety), 229 (8, a), 212 (6, b), 127 (20), 57 (100). o - 19 - 23 0 352 Q M_ ^■^Joenoroycin A enzyme 2 R a b H > ch3' enzyme HOOC r hct'^o H2/Pt ROOC o 3 R a H "> b CH3' HjCO^VOH H-i-OH tHjOPlOUOCH^, »c ^CMjOPlOKOCHjjjJ VQv °> Njc^H^, </div>

Claims

<div id="claims" class="application article clearfix printTableText"> 250352 Example 7 Antibiotic activities of the cleavage products An agar dilution test with Mueller-Hinton agar was carried out to determine the antibacterial activities (Antibiotics in Laboratory Medicine, V. Lorian, Ed., Baltimore 1986, pages 1-10). Minimum inhibitory concentration (pg/ml) Cleavage products Str. Staph. E.coli pyogenes aureus 77 503 DC2 MA >100 >100 >100 MB 3.125 25 >100 MC >100 >100 >100 Example 8 Transglycosylase assay The inhibition of the polymerization of the peptido-glycan-sugar chains by the cleavage products was carried out by the assay described by Izaki (J. Biol. Chem. 243. 3180-3192, 1968) using lipid intermediates from the cell membrane of E. coli K 12. It emerges from this that moenomycin A (20 pg/ml) inhibits the transglycosylase reaction by 52.7 % and the cleavage product MB inhibits the enzyme by 32.9 %. - 21 - 2303o2 WHAT WE CLAIM IS: 1. The compound of the formula II R^-O-CHo-CH-OR2 2-v-n-u* H;COOH;In which R1 Is hydrogen or a phosphono group and R2 Is a branched or unbranched, saturated or unsaturated (Cj to C2S)-alkyl group.;2. The compound as claimed in claim 1, wherein the alkyl group has a chain length of 10 to 30 carbon atoms.;3. The compound as claimed in claim 1 or 2, wherein the alkyl group has a chain length of 20 to 25 caxbon atoms.;4. A process for the preparation of the compound of the formula II as claimed in claim 1, which comprises incubating phosphoglycolipid antibiotics with Bacillus spec. DSM 4675 or an enzyme isolate obtained therefrom.;5. The process as claimed in claim 4, wherein incubation is carried out at a pH of 5.5 to 8.5.;6. A compound according to claim 1 substantially as herein described or exemplified.;7. a process according to 4 substantially as herein described or exemplified.;HOECHST Al ELLSCHAFT;By Their;HENRY \ GOES LTD By:;4 -18 JUH1991* L </div>