title: Oxygen dependent electron transfer in the cytochrome bc(1) complex.
abstract: The effect of molecular oxygen on the electron transfer activity of the cytochrome bc(1) complex was investigated by determining the activity of the complex under the aerobic and anaerobic conditions. Molecular oxygen increases the activity of Rhodobacter sphaeroides bc(1) complex up to 82%, depending on the intactness of the complex. Since oxygen enhances the reduction rate of heme b(L), but shows no effect on the reduction rate of heme b(H), the effect of oxygen in the electron transfer sequence of the cytochrome bc(1) complex is at the step of heme b(L) reduction during bifurcated oxidation of ubiquinol.
authors.affiliation: Department of Biochemistry and Molecular Biology, Oklahoma State University, Stillwater, OK 74078, USA.
authors.forename: Fei
authors.initials: F
authors.lastname: Zhou
authors.forename: Ying
authors.initials: Y
authors.lastname: Yin
authors.forename: Ting
authors.initials: T
authors.lastname: Su
authors.forename: Linda
authors.initials: L
authors.lastname: Yu
authors.forename: Chang-An
authors.initials: CA
authors.lastname: Yu
mesh_terms: D004579:Electron Transport; D014450:Electron Transport Complex III / Q000378:metabolism*; D006418:Heme / Q000378:metabolism*; D007700:Kinetics; D010084:Oxidation-Reduction; D010100:Oxygen / Q000378:metabolism*; D012242:Rhodobacter sphaeroides / Q000378:metabolism*; D013481:Superoxides / Q000378:metabolism; D014451:Ubiquinone / Q000031:analogs & derivatives* / Q000378:metabolism
chemical_list: D013481:Superoxides; D014451:Ubiquinone; D006418:Heme; D014450:Electron Transport Complex III; C003741:ubiquinol; D010100:Oxygen