Crystal structure of hemoprotein domain of P450BM-3, a prototype for microsomal P450's.Ravichandran, K.G., Boddupalli, S.S., Hasermann, C.A., Peterson, J.A., Deisenhofer, J.
(1993) Science 261: 731-736
- PubMed: 8342039
- PubMed Abstract:
- P450Bm-3 and Other Inducible Bacterial P450 Cytochromes: Biochemistry and Regulation
(1991) Annu.Rev.Pharmacol.Toxicol. 31: 177
- Crystallization and Preliminary X-Ray Diffraction Analysis of P450Terp and the Hemoprotein Domain of P450Bm-3, Enzymes Belonging to Two Distinct Classes of the Cytochrome P450 Superfamily
Boddupalli, S.S.,Hasemann, C.A.,Ravichandran, K.G.,Lu, J.-Y.,Goldsmith, E.J.,Deisenhofer, J.,Peterson, J.A.
(1992) Proc.Natl.Acad.Sci.USA 89: 5567
Cytochrome P450BM-3, a bacterial fatty acid monoxygenase, resembles the eukaryotic microsomal P450's and their flavoprotein reductase in primary structure and function. The three-dimensional structure of the hemoprotein domain of P450BM-3 was determi ...
Cytochrome P450BM-3, a bacterial fatty acid monoxygenase, resembles the eukaryotic microsomal P450's and their flavoprotein reductase in primary structure and function. The three-dimensional structure of the hemoprotein domain of P450BM-3 was determined by x-ray diffraction and refined to an R factor of 16.9 percent at 2.0 angstrom resolution. The structure consists of an alph and a beta domain. The active site heme is accessible through a long hydrophobic channel formed primarily by the beta domain and the B' and F helices of the alpha domain. The two molecules in the asymmetric unit differ in conformation around the substrate binding pocket. Substantial differences between P450BM-3 and P450cam, the only other P450 structure available, are observed around the substrate binding pocket and the regions important for redox partner binding. A general mechanism for proton transfer in P450's is also proposed.
Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas 75235-9050.