title: Promoter analysis of the catalase-peroxidase gene (cpeA) from Rhodobacter capsulatus.
abstract: The expression of the Rhodobacter capsulatus catalase-peroxidase (cpeA) was studied by in-frame fusions of the upstream region of the cpeA gene to a promoter-less lacZ gene. The transcription of the cpeA gene is about 20-50-fold higher under aerobic-dark than under anaerobic-light conditions. The promoter was localized within a 69-bp upstream DNA region. The transcription start site, determined by primer extension, is 28 bases upstream from the initiation codon, confirming the postulated promoter localized by deletion analysis. Deletion of the part of the upstream region specifically responsible for oxygen regulation resulted in constitutive expression of the cpeA gene.
authors.affiliation: Institut für Biologie 2/Mikrobiologie, Albert-Ludwigs-Universität, Freiburg, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Forkl
authors.forename: G
authors.initials: G
authors.lastname: Drews
authors.forename: M H
authors.initials: MH
authors.lastname: Tadros
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins; D001483:Base Sequence; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D004269:DNA, Bacterial / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics; D015964:Gene Expression Regulation, Bacterial / Q000187:drug effects; D005798:Genes, Bacterial; D006861:Hydrogen Peroxide / Q000494:pharmacology; D007763:Lac Operon; D008969:Molecular Sequence Data; D010544:Peroxidases / Q000235:genetics* / Q000378:metabolism; D011401:Promoter Regions, Genetic; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D016354:Rhodobacter capsulatus / Q000187:drug effects / Q000201:enzymology* / Q000235:genetics*; D017384:Sequence Deletion
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D011993:Recombinant Fusion Proteins; D006861:Hydrogen Peroxide; D010544:Peroxidases; C081610:catalase-peroxidase, bacteria