title: A putative anaerobic coproporphyrinogen III oxidase in Rhodobacter sphaeroides. II. Analysis of a region of the genome encoding hemF and the puc operon.
abstract: The puc operon of Rhodobacter sphaeroides encoding polypeptides of the major light-harvesting complex, LH2, has been found to be linked to hemF, a gene encoding a putative anaerobic coproporphyrinogen III oxidase. The puc-hemF region of the R. sphaeroides genome has been investigated by insertional mutagenesis, complementation analysis of these insertional mutants and DNA sequencing. A third gene, designated pucC, has been found immediately downstream of pucA and has been shown to be essential for LH2 expression. pucC is cotranscribed with pucB and pucA; however, hemF and the pucBAC operon were found not to be transcriptionally linked. Ultrastructural studies indicated that the morphology of the intracytoplasmic membrane may depend upon expression of pucC as well as pucBA.
authors.affiliation: Krebs Institute, Department of Molecular Biology, University of Sheffield, UK.
authors.forename: L C
authors.initials: LC
authors.lastname: Gibson
authors.forename: P
authors.initials: P
authors.lastname: McGlynn
authors.forename: M
authors.initials: M
authors.lastname: Chaudhri
authors.forename: C N
authors.initials: CN
authors.lastname: Hunter
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D002874:Chromosome Mapping; D003304:Coproporphyrinogen Oxidase / Q000235:genetics*; D003593:Cytoplasm / Q000648:ultrastructure; D005798:Genes, Bacterial / Q000235:genetics* / Q000502:physiology; D008040:Genetic Linkage / Q000235:genetics*; D008969:Molecular Sequence Data; D016254:Mutagenesis, Insertional; D016366:Open Reading Frames / Q000235:genetics; D009876:Operon / Q000235:genetics*; D012242:Rhodobacter sphaeroides / Q000201:enzymology / Q000235:genetics* / Q000648:ultrastructure; D013053:Spectrophotometry
chemical_list: D003304:Coproporphyrinogen Oxidase