title: Characterization and expression of the co-transcribed cyc1 and cyc2 genes encoding the cytochrome c4 (c552) and a high-molecular-mass cytochrome c from Thiobacillus ferrooxidans ATCC 33020.
abstract: The sequence of the cyc1 gene encoding the Thiobacillus ferrooxidans ATCC 33020 c552 cytochrome, shows that this cytochrome is a 21-kDa periplasmic c4-type cytochrome containing two similar monohaem domains. The kinetics of reduction and the fact that cytochromes c4 are considered to be physiological electron donors of cytochrome oxidases suggest that the last steps of the iron respiratory chain are: rusticyanin-->cytochrome c4-->cytochrome oxidase. In Thiobacillus ferrooxidans, cyc1 is co-transcribed with the cyc2 gene, encoding a high-molecular-mass monohaem cytochrome c. This suggests that the cytochromes encoded by these genes belong to the same electron transfer chain.
authors.affiliation: Laboratoire de Chimie Bactérienne, CNRS, Marseille, France.
authors.forename: C
authors.initials: C
authors.lastname: Appia-Ayme
authors.forename: A
authors.initials: A
authors.lastname: Bengrine
authors.forename: C
authors.initials: C
authors.lastname: Cavazza
authors.forename: M T
authors.initials: MT
authors.lastname: Giudici-Orticoni
authors.forename: M
authors.initials: M
authors.lastname: Bruschi
authors.forename: M
authors.initials: M
authors.lastname: Chippaux
authors.forename: V
authors.initials: V
authors.lastname: Bonnefoy
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D003574:Cytochrome c Group / Q000235:genetics* / Q000378:metabolism; D045304:Cytochromes c; D004269:DNA, Bacterial / Q000032:analysis; D004579:Electron Transport; D005798:Genes, Bacterial; D006418:Heme / Q000378:metabolism; D007700:Kinetics; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D010084:Oxidation-Reduction; D019897:Periplasm; D012329:RNA, Bacterial / Q000032:analysis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D029701:Saccharomyces cerevisiae Proteins; D013855:Thiobacillus / Q000235:genetics* / Q000378:metabolism; D014158:Transcription, Genetic
chemical_list: C014059:CYC1 protein, S cerevisiae; D003574:Cytochrome c Group; D004269:DNA, Bacterial; D012329:RNA, Bacterial; D029701:Saccharomyces cerevisiae Proteins; C083951:cytochrome c553; D006418:Heme; D045304:Cytochromes c; C022302:cytochrome C-552