Antibiotic 97518, pharmaceutically acceptable salts and compositions, and use thereof

摘要

Antibiotic 97518 (I) has mass spectrum recorded from a 0.01 mg/ml solution in acetonitrile and water (50:50) (v/v) giving a doubly protonated ion at 1097 m/z on a Thermofinnigan LCQ deca instrument under the electrospray conditions such as spray voltage (4.5 kV), capillary temperature (200[deg]C), capillary voltage (28 V) and infusion mode (5 Microl/minute). Antibiotic 97518 (I) has: (a) mass spectrum recorded from a 0.01 mg/ml solution in acetonitrile and water (50:50) (v/v) giving a doubly protonated ion at 1097 m/z on a Thermofinnigan LCQ deca instrument under the electrospray conditions such as spray voltage (4.5 kV), capillary temperature (200 [deg]C), capillary voltage (28 V) and infusion mode (5 Microl/minute); (b) infrared spectrum recorded in KBr with a Bruker FT-IR spectrophotomer model IFS 48, which exhibits the absorption maxima (in cm->1>) 3295, 3058, 2970, 2930, 1660, 1531, 1411, 1336, 1263 and 1109; (c) UV spectrum performed in MeOH with a Perkin-Elmer spectrophotometer lambda 16, which exhibits two shoulders at 279 and 288 nm; (d) 1>H-NMR spectrum recorded in the mixture H2O/D2O/CD3CN 80/10/10 (pH 2.6 HCl) at 25[deg]C on a Bruker AMX 600 spectrometer applying a water suppression sequence, using as internal standard the residual signal of acetonitrile at 1.99 ppm, which shows 1>H signals such as [delta that is a ppm multiplicity, (attribution)] 0.79 d (Ch3), 0.84 d (CH3), 0.86 d (CH3), 0.97 d (CH3), 1.1 d (CH3), 1.20 d (CH3), 1.71 d (CH3), 2.33 q (CH2), 2.4-3.6 m (peptidic alpha CH's), 3.6-5.1 m (peptidic alpha CH's), 5.27-5.82 s (CH2), 6.49 q (CH), 6.9-8.57 t and d (aromatic CH's) and 7.74-9.1 d and m (aromatic CH's and peptidic NH's); (e) 1>3>C-NMR spectrum recorded in the mixture H2O/D2O/CD3CN 80/10/10 (pH 2.6 HCl) at 25[deg]C on a Bruker AMX 600 spectrometer using as internal standard the residual signal of acetonitrile at 1.39, 118.69 ppm showing the 1>3>C signals such as [delta =ppm, (attribution)] 10.27-20.95 (aliphatic CH3's), 23.42-48.15 (aliphatic CH2's), 48.77-66.6 (peptide alpha CH's), 108-136 (aromatic and double bonds CH's and quaternary carbons) and 166.12-176.3 (peptidic carbonyls); and (f) the acid hydrolysate (HCl 6N, 105[deg]C, 24 hours), showing the presence of the acid resistant amino acids after derivatization with 6-aminoquinolyl-N-hydroxysuccinimidyl carbamate such as lanthionine, methyllanthionin, glycine, threonine, proline, valine, glutamic acid, histidine and isoleucine, and its salts with acids and bases, where mass spectrum, infrared spectrum, UV spectrum and NMR spectrum are as given in the specification. Independent claims are also included for: (1) producing (M1) (I) and its salts with acids and bases as mentioned in (I), involves culturing Planomonospora sp. DSM 14920 or its variant or mutant maintaining the ability of producing (I), under aerobic conditions in an aqueous nutrient medium containing an assimilable source of carbon, nitrogen, and inorganic salts, isolating (I) from the mycelium and/or the filtered culture broth and purifying (I); (2) a pharmaceutical composition (II) comprising (I) or its salt with acids and bases; and (3) a biologically pure culture of Planomonospora sp. DSM 14920, or its variant or mutant maintaining the ability of producing (I), when cultured under aerobic conditions in the presence of assimilable sources of carbon, nitrogen and inorganic salts. ACTIVITY : Antibacterial. No biological data given. MECHANISM OF ACTION : None given.