Microbial hydroxylation of epiandrosterone by <i>Aspergillus candidus</i>
作者:Kudret Yildirim、Ali Kuru
DOI:10.1080/10242422.2017.1289184
日期:2017.3.4
work, Aspergillus candidus MRC 22634 converted epiandosterone 1 into 10 hydroxylated metabolites. A. candidus has been shown to hydroxylate 1 predominantly at C-11α, C-1α, and C-15β with minor hydroxylations occurring at C-14α and C-7α. Oxidation at C-3, reduction at C-17, and C-3 epimerization of some of the remaining substrate have also been shown. 15β-Hydroxylation and C-3 epimerization of 1 by
Hydroxylation of DHEA, androstenediol and epiandrosterone by Mortierella isabellina AM212. Evidence indicating that both constitutive and inducible hydroxylases catalyze 7α- as well as 7β-hydroxylations of 5-ene substrates
underwent effective hydroxylation; 5-ene substrates – DHEA and androstenediol – were transformed into a mixture of 7α- and 7β- allyl alcohols, while epiandrosterone was converted into 7α- (mainly), 11α- and 9α- monohydroxy derivatives. Ketoconazole and cycloheximide inhibition studies suggest the presence of constitutive and substrate-induced hydroxylases in M. isabellina. On the basis of time course analysis
Hydroxylation of DHEA and its analogues by Absidia coerulea AM93. Can an inducible microbial hydroxylase catalyze 7α- and 7β-hydroxylation of 5-ene and 5α-dihydro C19-steroids?
coerulea AM93. DHEA and androstenediol were transformed to the mixture of allyl 7-hydroxy derivatives, while EpiA and 5α-androstan-3,17-dione were converted mainly to 7α- and 7β-alcohols accompanied by 9α- and 11α-hydroxy derivatives. On the basis of (i) time course analysis of hydroxylation of the abovementioned substrates, (ii) biotransformation with resting cells at different pH, (iii) enzyme inhibition
Microbial Baeyer–Villiger oxidation of steroidal ketones using Beauveria bassiana: Presence of an 11α-hydroxyl group essential to generation of D-homo lactones
a rare reduction to 11α-hydroxy-5β-dihydrotestosterone. The experiments have demonstrated that the Baeyer–Villiger monooxygenase produced by the strain catalyzes solely oxidation of C-20 or C-17 ketones with 11α-hydroxyl group. 17-Oxo steroids, beside the 11α-hydroxylation and Baeyer–Villigeroxidation, also underwent reduction to 17β-alcohols; activity of 17β-hydroxysteroid dehydrogenase (17β-HSD)
Microbial Transformation of Epiandrosterone by Aspergillus Sydowii
作者:Kudret Yildirim、Ali Kuru
DOI:10.3184/174751916x14786062524888
日期:2016.12
Incubation of epiandrosterone with Aspergillus sydowii MRC 200653 afforded ten metabolites. The fungal dehydrogenation of epiandrosterone is reported for the first time. The formation of the major metabolite, 6β-hydroxyandrost-4-ene-3,17-dione, involved first dehydrogenation to give a 4-ene and then hydroxylation at C-6β. Small amounts of the substrate were hydroxylated at C-1α, C-7α, C-7β and C-11α