Microbial side-chain degradation of ergosterol and its 3-substituted derivatives: A new route for obtaining of deltanoids
作者:Dmitry V. Dovbnya、Olga V. Egorova、Marina V. Donova
DOI:10.1016/j.steroids.2010.04.001
日期:2010.10
The strain of Mycobacterium sp. VKM Ac-1815D was found to convert ergosterol and its 3-acetate mainly to androst-4-ene-3,17-dione (AD) thus demonstrating ability to reduce 7(8)-double bond and hydrolyze sterol ester in addition to oxidation of 3beta-hydroxy group, Delta(5)-Delta(4) isomerization and side-chain degradation. Ergosterol bioconversion in the presence of isoflavones and ions of some bivalent
分枝杆菌菌株。发现 VKM Ac-1815D 可将麦角甾醇及其 3-乙酸酯主要转化为雄激素-4-烯-3,17-二酮 (AD),因此除了氧化外,还展示了还原 7(8)-双键和水解甾醇酯的能力3beta-羟基、Delta(5)-Delta(4) 异构化和侧链降解。在异黄酮和某些二价金属离子(已知的 3β-羟基类固醇脱氢酶抑制剂)存在下,麦角甾醇的生物转化不会改变产品组成。用甲氧基甲基保护麦角甾醇 3beta-羟基允许形成保留 Delta(5,7)-配置的生物转化产品。主要产物通过质谱和质子 NMR 鉴定为 3-甲氧基甲氧基-雄性化合物-5,7-二烯-17-酮 (MA)。发现 MA 产生活性可被甾醇诱导,胆甾酮或石胆酸,但不与脱氢表雄酮、AD、androsta-1,4-ene-3,17-dione 或有机酸。在优化条件下,10g/l O-甲氧基甲基-麦角甾醇(约60%摩尔转化率)120h的MA产