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Semi-rational Engineering Of Cytochrome P450sca-2 In A Hybrid System For Enhanced Catalytic Activity: Insights Into The Important Role Of Electron Transfer.

Lina Ba, Pan Li, Hui Zhang, Yan Duan, Zhanglin Lin
Published 2013 · Medicine, Chemistry
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Hybrid P450 systems in which P450 monooxygenases are reconstituted with non-native or surrogate redox partners have become important for the engineering of this class of versatile enzymes. P450sca-2 from Streptomyces carbophilus stereoselectively hydroxylates mevastatin to yield pravastatin, a cholesterol-lowering drug. While S. carbophilus has been successfully applied in the industrial biotransformation process for pravastatin, the molecular study and engineering of P450sca-2 has been very limited. We have previously established a functional P450sca-2/Pdx/Pdr hybrid system. In this study, on the basis of a more active P450sca-2 mutant (R8-5C), five sites located in the substrate binding pocket, substrate access entrance, and presumed Pdx interaction interface were rationally chosen, and systematically subjected to site-directed saturation mutagenesis (SDSM), and three rounds of iterative saturation mutagenesis (ISM). A best mutant (Variant III) was obtained, which showed a whole cell biotransformation activity (377.5 mg/L) and an overall apparent k(cat) (6.37 min⁻¹) that was 7.1- and 10.0-fold that of the starting template R8-5C, respectively. Kinetic characterization revealed that most of the improvements seen for the SDSM and ISM mutants came from enhanced overall electron transfer, with the two sites at the interface between P450sca-2 and Pdx (T119 and N363) being most critical. Our study underscores the important role of electron transfer in a hybrid P450 system, and also demonstrates the utility of ISM in optimizing the redox partner interface. This should facilitate engineering of this and other important hybrid P450 systems.
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