The invention relates to an isolated polynucleotide sequence comprising a nucleic acid sequence encoding the amino acid sequence of KshA protein or of KshB protein, encoded by nucleotides 499-1695 of SEQ ID NO:1 or by nucleotides 387-1427 of SEQ ID NO:2, respectively, and functional homologues thereof.The polynucleotides of the invention can be used to construct genetically modified microorganisms blocked in 3-ketosteroid 9.alpha.-hydroxylase activity, which are useful in the microbial degradation of steroids to accumulate certain steroid products.

 
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