Abstract
Hydroxysteroid dehydrogenases have emerged as indispensable tools in the synthesis of steroids, bile acids, and other steroid derivatives for the pharmaceutical and chemical industries. In this study, a novel approach was developed to simultaneously improve the stability and activity of a hydroxysteroid dehydrogenase by combining B-factor analysis and computer-aided prediction. This semi-rational method was demonstrated to be highly effective for enzyme engineering. In addition, NAD kinase was introduced to convert NAD+ to NADP+ for effective coenzyme regeneration in the whole-cell multienzyme-catalyzed system. This strategy reduces the significant economic costs associated with externally supplemented cofactors in NADP-dependent biosynthetic pathways.
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