title: 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.
abstract: Cytochromes P450 are members of a superfamily of hemoproteins that are involved in the metabolism of various physiologic and xenobiotic organic compounds. This superfamily of proteins can be divided into two classes based on the electron donor proximal to the P450: an iron-sulfur protein for class I P450s or a flavoprotein for class II. The only known tertiary structure of any of the cytochromes P450 is that of P450cam, a class I soluble enzyme isolated from Pseudomonas putida (product of the CYP101 gene). To understand the details of the structure-function relationships within and between the two classes, structural studies on additional cytochromes P450 are crucial. We report here characterization of the crystal forms of two soluble, bacterial enzymes: cytochrome P450terp [class I enzyme from a Pseudomonas species (product of CYP108 gene)] and the hemoprotein domain of cytochrome P450BM-3 [class II enzyme from Bacillus megaterium (product of the CYP102 gene)]. The crystals of cytochrome P450terp are hexagonal and belong to the space group P6(1)22 (or its enantiomorph, P6(5)22) with unit cell dimensions a = b = 68.9 A and c = 458.7 A. The crystals of the hemoprotein domain of cytochrome P450BM-3 are monoclinic and belong to the space group P2(1) with unit cell dimensions a = 59.4 A, b = 154.0 A, c = 62.2 A, and beta = 94.7 degrees. Diffraction data for the crystals of these two proteins were obtained to a resolution better than 2.2 A. Assuming the presence of two molecules in the asymmetric unit for the hemoprotein domain of P450BM-3 and one molecule for P450terp, the calculated values of Vm are 2.6 and 3.3 A3/Da, respectively.
authors.affiliation: Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas 75235-9038.
authors.forename: S S
authors.initials: SS
authors.lastname: Boddupalli
authors.forename: C A
authors.initials: CA
authors.lastname: Hasemann
authors.forename: K G
authors.initials: KG
authors.lastname: Ravichandran
authors.forename: J Y
authors.initials: JY
authors.lastname: Lu
authors.forename: E J
authors.initials: EJ
authors.lastname: Goldsmith
authors.forename: J
authors.initials: J
authors.lastname: Deisenhofer
authors.forename: J A
authors.initials: JA
authors.lastname: Peterson
mesh_terms: D001410:Bacillus megaterium / Q000201:enzymology / Q000235:genetics; D001426:Bacterial Proteins; D003460:Crystallization; D003577:Cytochrome P-450 Enzyme System / Q000737:chemistry* / Q000235:genetics*; D005798:Genes, Bacterial; D006420:Hemeproteins / Q000737:chemistry* / Q000235:genetics; D006899:Mixed Function Oxygenases / Q000737:chemistry* / Q000235:genetics; D005810:Multigene Family; D009251:NADPH-Ferrihemoprotein Reductase; D011487:Protein Conformation; D016958:Pseudomonas putida / Q000201:enzymology / Q000235:genetics; D014961:X-Ray Diffraction
chemical_list: D001426:Bacterial Proteins; D006420:Hemeproteins; D003577:Cytochrome P-450 Enzyme System; D006899:Mixed Function Oxygenases; C073494:terpineol hydroxylase; D009251:NADPH-Ferrihemoprotein Reductase; C052423:flavocytochrome P450 BM3 monoxygenases