title: The cytochrome C oxidase genes in blue-green algae and characteristics of the deduced protein sequence for subunit II of the thermophilic cyanobacterium Synechococcus vulcanus.
abstract: Blue-green algae (cyanobacteria) contain both primitive photosynthetic and respiratory systems in their membranes. The controversial genes coding for an alpha alpha 3-type cytochrome oxidase in cyanobacteria were examined. The DNA probe coding for the most conserved part of subunit I hybridized with DNA fragments from four cyanobacterial species. We have cloned the genes coding for subunits I and II from the genomic library of the thermophilic cyanobacterium Synechococcus vulcanus and determined the nucleotide sequence of the subunit II gene. The deduced protein sequence (327 amino acid residues) indicates that there are two hydrophobic segments near the N-terminus and a hydrophilic intermembrane domain containing ligands for CuA (the ESR-active Copper) similar to other subunit IIs. The S. vulcanus subunit II does not contain the cytochrome c moiety that is present in bacilli and thermophiles.
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, Tokyo, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Tano
authors.forename: M
authors.initials: M
authors.lastname: Ishizuka
authors.forename: N
authors.initials: N
authors.lastname: Sone
mesh_terms: D000595:Amino Acid Sequence; D001419:Bacteria / Q000201:enzymology / Q000235:genetics; D001483:Base Sequence; D003001:Cloning, Molecular; D000458:Cyanobacteria / Q000201:enzymology / Q000235:genetics*; D003576:Electron Transport Complex IV / Q000235:genetics*; D005796:Genes; D006358:Hot Temperature; D006801:Humans; D046911:Macromolecular Substances; D008969:Molecular Sequence Data; D009838:Oligodeoxyribonucleotides; D016133:Polymerase Chain Reaction; D015183:Restriction Mapping; D012689:Sequence Homology, Nucleic Acid
chemical_list: D046911:Macromolecular Substances; D009838:Oligodeoxyribonucleotides; D003576:Electron Transport Complex IV