title: Chromosome-mediated iron uptake system in pathogenic strains of Vibrio anguillarum.
abstract: We describe in this work a new iron uptake system encoded by chromosomal genes in pathogenic strains of Vibrio anguillarum. This iron uptake system differs from the plasmid-encoded anguibactin-mediated system present in certain strains of V. anguillarum in several properties. The siderophore anguibactin is not utilized as an external siderophore, and although characteristic outer membrane proteins are synthesized under iron-limiting conditions, these are not related to the plasmid-mediated outer membrane protein OM2 associated with ferric anguibactin transport. Furthermore, the siderophore produced by the plasmidless strains may be functionally related to enterobactin as demonstrated by bioassays with enterobactin-deficient mutants, although its behavior under various chemical treatments suggested major differences from that siderophore. Hybridization experiments suggested that the V. anguillarum chromosome-mediated iron uptake system is unrelated genetically to either the anguibactin or enterobactin-associated iron assimilation systems.
authors.affiliation: Department of Microbiology and Immunology, School of Medicine, Oregon Health Sciences University, Portland 97201.
authors.forename: M L
authors.initials: ML
authors.lastname: Lemos
authors.forename: P
authors.initials: P
authors.lastname: Salinas
authors.forename: A E
authors.initials: AE
authors.lastname: Toranzo
authors.forename: J L
authors.initials: JL
authors.lastname: Barja
authors.forename: J H
authors.initials: JH
authors.lastname: Crosa
mesh_terms: D000818:Animals; D001425:Bacterial Outer Membrane Proteins / Q000096:biosynthesis; D002876:Chromosomes, Bacterial; D004758:Enterobactin / Q000235:genetics; D005393:Fish Diseases / Q000382:microbiology; D005412:Flatfishes; D005798:Genes, Bacterial; D007501:Iron / Q000378:metabolism*; D007502:Iron Chelating Agents / Q000378:metabolism; D009154:Mutation; D009693:Nucleic Acid Hybridization; D010455:Peptides; D012689:Sequence Homology, Nucleic Acid; D017262:Siderophores; D014733:Vibrio / Q000235:genetics / Q000254:growth & development / Q000378:metabolism* / Q000472:pathogenicity; D014735:Vibrio Infections / Q000382:microbiology / Q000662:veterinary; D014774:Virulence
chemical_list: D001425:Bacterial Outer Membrane Proteins; D007502:Iron Chelating Agents; D010455:Peptides; D017262:Siderophores; D004758:Enterobactin; C049469:anguibactin; D007501:Iron