title: Cloning, sequencing and deletion from the chromosome of the gene encoding subunit I of the aa3-type cytochrome c oxidase of Rhodobacter sphaeroides.
abstract: The ctaD gene encoding subunit I of the aa3-type cytochrome c oxidase from Rhodobacter sphaeroides has been cloned. The gene encodes a polypeptide of 565 residues which is highly homologous to the sequences of subunit I from other prokaryotic and eukaryotic sources, e.g. 51% identity with that from bovine, and 75% identity with that from Paracoccus denitrificans. The ctaD gene was deleted from the chromosome of R. sphaeroides, resulting in a strain that spectroscopically lacks cytochrome a. This strain maintains about 50% of the cytochrome c oxidase activity of the wild-type strain owing to the presence of an alternate o-type cytochrome c oxidase. The aa3-type oxidase was restored by complementing the chromosomal deletion with a plasmid-borne copy of the ctaD gene. This system is well suited for site-directed mutagenesis probing of the structure and function of cytochrome c oxidase.
authors.affiliation: School of Chemical Sciences, University of Illinois, Urbana 61801.
authors.forename: J P
authors.initials: JP
authors.lastname: Shapleigh
authors.forename: R B
authors.initials: RB
authors.lastname: Gennis
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics*; D001483:Base Sequence; D002872:Chromosome Deletion; D003001:Cloning, Molecular; D003227:Conjugation, Genetic; D004251:DNA Transposable Elements; D004269:DNA, Bacterial; D003576:Electron Transport Complex IV / Q000235:genetics*; D015723:Gene Library; D005816:Genetic Complementation Test; D008969:Molecular Sequence Data; D012242:Rhodobacter sphaeroides / Q000201:enzymology / Q000235:genetics*
chemical_list: D001426:Bacterial Proteins; D004251:DNA Transposable Elements; D004269:DNA, Bacterial; D003576:Electron Transport Complex IV