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• W1979921912 abstract "In this paper we focus on the course of 7-hydroxylation of DHEA, androstenediol, epiandrosterone, and 5α-androstan-3,17-dione by Absidia coerulea AM93. Apart from that, we present a tentative analysis of the hydroxylation of steroids in A. 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 analysis together with (iv) geometrical relationship between the C-H bond of the substrate undergoing hydroxylation and the cofactor-bound activated oxygen atom, it is postulated that the same enzyme can catalyze the oxidation of C7-Hα as well as C7-Hβ bonds in 5-ene and 5α-dihydro C19-steroids. Correlations observed between the structure of the substrate and the regioselectivity of hydroxylation suggest that 7β-hydroxylation may occur in the normal binding enzyme-substrate complex, while 7α-hydroxylation-in the reverse inverted binding complex." @default.
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• W1979921912 date "2014-01-01" @default.
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• W1979921912 title "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?" @default.
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• W1979921912 doi "https://doi.org/10.1016/j.bmc.2013.11.050" @default.
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