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The enzyme 3-ketosteroid-Δ 1 -dehydrogenase (KSDD), involved in steroid metabolism, catalyzes the transformation of 4-androstene-3,17-dione (AD) to androst-1,4-diene-3,17-dione (ADD) specifically. Its coding gene was obtained from Mycobacterium neoaurum JC-12 and expressed on the plasmid pMA5 in Bacillus subtilis 168. The successfully expressed KSDD was analyzed by native-PAGE. The activities...
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