Abstract
Hydroxylation activity of the mold fungi belonging to the orders Dothideales, Hypocreales, and Mucorales towards Δ5-3β-hydroxysteroids was studied. The fungi Bipolaris sorokiniana, Fusarium sp., and Rhizopus nigricans were able to introduce hydroxy group at position 7α; however, this ability was detected only at a low substrate load and with a low yield. A 7α-hydroxylase activity of the Curvularia lunata VKPM F-981 culture was shown for the first time. It was demonstrated that the studied strain was capable of stereo- and regioselective transformations of androstane 5-olefins at a load not less than 2 g/1. Conversion of pregnane steroids by this culture yielded both 7α- and 11β-hydroxy derivatives. The introduction of 7α-hydroxy group by this strain occurred concurrently with enzymatic hydrolysis of ester groups, which proceeded under mild conditions to give the corresponding alcohols in the cases of both 3-acetate of Δ5-androstenes and mono- and triacetates of Δ5-pregnenes.
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Original Russian Text © V.A. Andryushina, A.V. Druzhinina, V.V. Yaderets, T.S. Stytsenko, N.E. Voishvillo, 2010, published in Prikladnaya Biokhimiya i Mikrobiologiya, 2010, Vol. 46, No. 1, pp. 78–83.
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Andryushina, V.A., Druzhinina, A.V., Yaderets, V.V. et al. 7α-Hydroxylation of steroid 5-olefins by mold fungi. Appl Biochem Microbiol 46, 69–74 (2010). https://doi.org/10.1134/S0003683810010126
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DOI: https://doi.org/10.1134/S0003683810010126