title: 21-Acetoxy-pregna-4(5),9(11),16(17)-triene-21-ol-3,20-dione conversion by Nocardioides simplex VKM Ac-2033D.
abstract: The conversion of 21-acetoxy-pregna-4(5),9(11),16(17)-triene-21-ol-3,20-dione (I) by Nocardioides simplex VKM Ac-2033D was studied purposed selective production of its 1(2)-dehydroanalogues-value precursors in the synthesis of modern glucocorticoids starting from 9alpha-hydroxyandrostenes. 21-Acetoxy-pregna-1(2),4(5),9(11),16(17)-tetraene-21-ol-3,20-dione (II), pregna-4(5),9(11),16(17)-triene-21-ol-3,20-dione (III) and pregna-1(2),4(5),9(11),16(17)-tetraene-21-ol-3,20-dione (IV) were revealed as metabolites, and the structures were confirmed by mass spectrometry and (1)H nuclear magnetic resonance (NMR) spectroscopy. The metabolic pathways of I by N. simplex included 1(2)-dehydrogenation and deacetylation. The sequence of the reactions was shown to depend on the transformation conditions. The presence of both soluble and membrane associated steroid esterases in N. simplex was demonstrated using cell fractionation. Unlike inducible 1(2)-dehydrogenase, steroid esterase was shown to be constitutive. The conditions providing selective accumulation of II from I by whole N. simplex cells were determined.
authors.affiliation: G.K. Skryabin Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, Pushchino, pr. Nauki 5, 142290 Moscow region, Russia. donova@ibpm.pushino.ru
authors.forename: Victoria V
authors.initials: VV
authors.lastname: Fokina
authors.forename: Marina V
authors.initials: MV
authors.lastname: Donova
mesh_terms: D000107:Acetylation; D018533:Biomass; D001711:Biotransformation; D002855:Chromatography, Thin Layer; D003505:Cyclodextrins / Q000737:chemistry / Q000494:pharmacology; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry / Q000379:methods; D009618:Nocardiaceae / Q000166:cytology / Q000235:genetics / Q000378:metabolism*; D010619:Phenazines / Q000494:pharmacology; D011281:Pregnatrienes / Q000737:chemistry* / Q000378:metabolism*; D013347:Subcellular Fractions / Q000378:metabolism; D013997:Time Factors
chemical_list: D003505:Cyclodextrins; D010619:Phenazines; D011281:Pregnatrienes