Structure of a cytochrome P450-redox partner electron-transfer complex.Sevrioukova, I.F., Li, H., Zhang, H., Peterson, J.A., Poulos, T.L.
(1999) Proc Natl Acad Sci U S A 96: 1863-1868
- PubMed: 10051560
- DOI: https://doi.org/10.1073/pnas.96.5.1863
- Primary Citation of Related Structures:
- PubMed Abstract:
The crystal structure of the complex between the heme- and FMN-binding domains of bacterial cytochrome P450BM-3, a prototype for the complex between eukaryotic microsomal P450s and P450 reductase, has been determined at 2.03 A resolution. The flavodoxin-like flavin domain is positioned at the proximal face of the heme domain with the FMN 4.0 and 18.4 A from the peptide that precedes the heme-binding loop and the heme iron, respectively. The heme-binding peptide represents the most efficient and coupled through-bond electron pathway to the heme iron. Substantial differences between the FMN-binding domains of P450BM-3 and microsomal P450 reductase, observed around the flavin-binding sites, are responsible for different redox properties of the FMN, which, in turn, control electron flow to the P450.
University of California, Department of Molecular Biology and Biochemistry, 3205 Bio Sci II, Irvine, CA 92697-3900, USA.