title: Structural characterization of protein secretion genes of the bacterial phytopathogen Xanthomonas campestris pathovar campestris: relatedness to secretion systems of other gram-negative bacteria.
abstract: The nucleotide sequence was determined of a 5.3 kb region of the Xanthomonas campestris pathovar campestris genome carrying a gene cluster encoding protein secretion and pathogenicity functions. A putative promoter sequence and five open reading frames (ORF) which may be part of an operon were revealed. The five predicted primary translation products comprise 531, 390, 147, 169 and 138 amino acids with Mr values of 58,854, 42,299, 15,548, 18,214 and 15,108 respectively. A sixth, partial ORF is also present. Between ORF1 and ORF2 is a sequence of unknown function showing 7 bp duplications. The deduced amino acid sequence of ORF1 is related to the Klebsiella pneumoniae PulE protein, to the Bacillus subtilis ComG ORF1 and to the Agrobacterium tumefaciens VirB ORF11 products. In addition, the deduced amino acid sequence of ORF2 showed homology to the PulF and to the ComG ORF2 products. The proteins encoded by ORF3, 4 and 5 showed amino acid homology to PulG, H and I products respectively. The proteins encoded by ORF2, 3, 4 and 5 showed significant hydrophobic domains which may represent membrane-spanning regions. By contrast the protein encoded by ORF1 was largely hydrophilic and had two putative nucleoside triphosphate binding sites.
authors.affiliation: John Innes Institute, Norwich, UK.
authors.forename: F
authors.initials: F
authors.lastname: Dums
authors.forename: J M
authors.initials: JM
authors.lastname: Dow
authors.forename: M J
authors.initials: MJ
authors.lastname: Daniels
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D001483:Base Sequence; D004269:DNA, Bacterial; D006090:Gram-Negative Bacteria / Q000235:genetics* / Q000378:metabolism; D026901:Membrane Transport Proteins; D008969:Molecular Sequence Data; D005810:Multigene Family; D016366:Open Reading Frames; D011401:Promoter Regions, Genetic; D015183:Restriction Mapping; D016415:Sequence Alignment; D016959:Xanthomonas campestris / Q000235:genetics* / Q000378:metabolism / Q000472:pathogenicity
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D026901:Membrane Transport Proteins; C071567:general secretion pathway protein, Xanthomonas campestris