Insight into the active-site structure and function of cytochrome oxidase by analysis of site-directed mutants of bacterial cytochrome aa3 and cytochrome bo
| Autor: | Laura Lemieux, John Walter Hill, Gerald T. Babcock, Shelagh Ferguson-Miller, Christos D. Georgiou, Jeffrey W. Thomas, John Fetter, Jonathan P. Hosler, Mary M. J. Tecklenburg, Jixiang Ma, Melissa W. Calhoun, James P. Shapleigh, Robert B. Gennis |
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| Rok vydání: | 1993 |
| Předmět: |
Cytochrome
Physiology Protein subunit Molecular Sequence Data Rhodobacter sphaeroides Protein Structure Secondary Electron Transport Complex IV Escherichia coli Cytochrome c oxidase Amino Acid Sequence Oxidase test Binding Sites biology Cytochrome b Escherichia coli Proteins Active site Cell Biology biology.organism_classification Cytochrome b Group Recombinant Proteins Models Structural Biochemistry biology.protein Mutagenesis Site-Directed Cytochromes Cytochrome aa3 |
| Zdroj: | Journal of bioenergetics and biomembranes. 25(2) |
| ISSN: | 0145-479X |
| Popis: | Cytochrome aa3 of Rhodobacter sphaeroides and cytochrome bo of E. coli are useful models of the more complex cytochrome c oxidase of eukaryotes, as demonstrated by the genetic, spectroscopic, and functional studies reviewed here. A summary of site-directed mutants of conserved residues in these two enzymes is presented and discussed in terms of a current model of the structure of the metal centers and evidence for regions of the protein likely to be involved in proton transfer. The model of ligation of the heme a3 (or o)-CuB center, in which both hemes are bound to helix X of subunit I, has important implications for the pathways and control of electron transfer. |
| Databáze: | OpenAIRE |
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