The fungus Gnomoniafructicola ATCC 11430 hydroxylates testosterone at C-2β in 40–60% yield. The enzyme involved has been shown to be an inducible CO sensitive, cyanide insensitive oxygenase, with a requirement for theΔ4-3-ketosteroid substrate functionality. The use of 2α- and 2β-deuterium labelled substrates has shown that hydrogen loss from C-2 during 2β hydroxylation is isotope dependent and non-stereospecific. This is interpreted in terms of a Δ2,4-dienolic enzyme-bound intermediate form of the substrate. Keywords: Gnomoniafructicola, hydroxylation, steroids, testosterone.
真菌Gnomoniafructicola A
TCC 11430以40-60%的产率在C-2β处对
睾酮进行羟基化。所涉及的酶已被证明是一种可诱导的CO敏感、
氰化物不敏感的氧化酶,需要Δ4-3-
酮类固醇底物的功能性。使用2α-和2β-
氘标记底物表明,在2β羟基化过程中,C-2处的氢损失是同位素依赖的,且不具有立体特异性。这被解释为底物的Δ2,4-二烯醇酶结合中间体形式。关键词:Gnomoniafructicola、羟基化、类
固醇、
睾酮。