title: Structural model and ligand interactions of the Xanthomonas axonopodis pv. citri oligopeptide-binding protein.
abstract: The oligopeptide-binding protein, OppA, ushers oligopeptide substrates to the membrane-associated oligopeptide permease (Opp), a multi-component ABC-type transporter involved in the uptake of oligopeptides by several bacterial species. In the present study, we report a structural model and an oligopeptide docking analysis of the OppA protein expressed by Xanthomonas axonopodis pv. citri (X. citri), the etiological agent of citrus canker. The X. citri OppA structural model showed a conserved three-dimensional structure, irrespective of the low amino acid identities with previously defined structures of Bacillus subtilis and Salmonella typhimurium orthologs. Oligopeptide docking analysis carried out with the proposed model indicated that the X. citri OppA preferentially binds tri- and tetrapeptides. The present study represents the first structural analysis of an OppA ortholog expressed by a phytopathogen and contributes to the understanding of the physiology and nutritional strategies of X. citri.
authors.affiliation: Departamento de Microbiologia, Instituto de Ciências Biomédicas II, Universidade de São Paulo, Cidade Universitária, São Paulo, SP, Brasil.
authors.forename: A
authors.initials: A
authors.lastname: Moutran
authors.forename: A
authors.initials: A
authors.lastname: Balan
authors.forename: L C S
authors.initials: LC
authors.lastname: Ferreira
authors.forename: A
authors.initials: A
authors.lastname: Giorgetti
authors.forename: A
authors.initials: A
authors.lastname: Tramontano
authors.forename: R C C
authors.initials: RC
authors.lastname: Ferreira
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D001665:Binding Sites; D002352:Carrier Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D008024:Ligands; D008074:Lipoproteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009842:Oligopeptides / Q000737:chemistry / Q000378:metabolism*; D010935:Plant Diseases / Q000382:microbiology; D011485:Protein Binding; D011487:Protein Conformation; D053532:Xanthomonas axonopodis / Q000235:genetics / Q000378:metabolism* / Q000472:pathogenicity
chemical_list: D001426:Bacterial Proteins; D002352:Carrier Proteins; D008024:Ligands; D008074:Lipoproteins; D009842:Oligopeptides; C046506:oligopeptide-binding protein, bacteria