title: Microbial transformation of maridomycin III by Serratia marcescens.
abstract: Two transformation products of maridomycin (MDM) III, MDM-S1 and MDM-S2 named after Serratia marcescens, were isolated by silica gel chromatography. NMR and IR analysis revealed that MDM-S1 and -S2 had no aldehyde group at C-18 on the macrolactone ring, and that the hydroxyl group at C-9 seemed to disappear. Although MDM-S1 and -S2 are less active against Gram-positive bacteria than starting MDM III they are interesting materials in view of the introduction of nitrogen into each molecule, and that the transformation products are produced by Gram-negative bacteria which are thought to be insensitive to macrolide antibiotics.
mesh_terms: D001419:Bacteria / Q000187:drug effects; D001711:Biotransformation; D005285:Fermentation; D008401:Gas Chromatography-Mass Spectrometry; D007933:Leucomycins / Q000378:metabolism* / Q000633:toxicity; D009682:Magnetic Resonance Spectroscopy; D008826:Microbial Sensitivity Tests; D012706:Serratia marcescens / Q000254:growth & development / Q000378:metabolism*; D013055:Spectrophotometry, Infrared
chemical_list: D007933:Leucomycins; C010602:maridomycin III