Cloning, expression and characterization of CYP102D1, a self-sufficient P450 monooxygenase from Streptomyces avermitilis

Kwon Young Choi, Eunok Jung, Da Hye Jung, Bishnu Prasad Pandey, Hyungdon Yun, Hyung Yun Park, Romas J. Kazlauskas, Byung Gee Kim

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

Among 33 cytochrome P450s (CYPs) of Streptomyces avermitilis, CYP102D1 encoded by the sav575 gene is naturally a unique and self-sufficient CYP. Since the native cyp102D1 gene could not be expressed well in Escherichia coli, its expression was attempted using codon-optimized synthetic DNA. The gene was successfully overexpressed and the recombinant CYP102D1 was functionally active, showing a Soret peak at 450 nm in the reduced CO difference spectrum. FMN/FAD isolated from the reductase domain showed the same fluorescence in thin layer chromatography separation as the authentic standards. Characterization of the substrate specificity of CYP102D1 based on NADPH oxidation rate revealed that it catalysed the oxidation of saturated and unsaturated fatty acids with very good regioselectivity, similar to other CYP102A families depending on NADPH supply. In particular, CYP102D1 catalysed the rapid oxidation of myristoleic acid with a k cat/K m value of 453.4 ± 181.5 μm -1·min -1. Homology models of CYP102D1 based on other members of the CYP102A family allowed us to alter substrate specificity to aromatic compounds such as daidzein. Interestingly, replacement of F96V/M246I in the active site increased catalytic activity for daidzein with a k cat/K m value of 100.9 ± 10.4 μm -1·min -1 (15-fold).

Original languageEnglish (US)
Pages (from-to)1650-1662
Number of pages13
JournalFEBS Journal
Volume279
Issue number9
DOIs
StatePublished - May 2012

Keywords

  • CYP102D1
  • cytochrome P450 monooxygenases
  • isoflavone
  • ortho-specific hydroxylation
  • self-sufficient P450

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