Microbial 9alpha-hydroxylation of steroids

摘要

A method is described to construct genetically modified strains of steroid degrading micro-organisms wherein multiple genes involved in steroid nucleus degradation are inactivated, such as steroid dehydrogenase genes. Examples for such genes are kstD1 and kstD2: strains with multiple inactivated steroid degrading enzyme genes can be used in the accumulation of steroid intermediates with a high yield. A preferred accumulation product is 9 alpha -hydroxy-4-androstene-3,17-dione.