title: TonB-dependent iron supply in Salmonella by alpha-ketoacids and alpha-hydroxyacids.
abstract: A range of structurally diverse alpha-ketoacids and alpha-hydroxyacids promoted the growth of isolates of Salmonella serovars S. typhimurium, S. enteritidis, S. agona, S. paratyphi and S. stanleyville in iron restricted conditions in the absence of functional siderophores. Growth stimulation, observed both in cross-feeding tests on solid medium and in liquid cultures, and uptake of 55Fe in the presence of alpha-ketoisocaproic acid, were TonB dependent in S. typhimurium. In this respect the mechanism is distinct from a previously described Serratia marcescens system (sfuABC); the presence of the cloned sfuABC genes mediated tonB-independent uptake by S. typhimurium of iron complexed with alpha-ketoacids.
authors.affiliation: Department of Microbiology and Immunology, University of Leicester, UK.
authors.forename: R
authors.initials: R
authors.lastname: Kingsley
authors.forename: W
authors.initials: W
authors.lastname: Rabsch
authors.forename: M
authors.initials: M
authors.lastname: Roberts
authors.forename: R
authors.initials: R
authors.lastname: Reissbrodt
authors.forename: P H
authors.initials: PH
authors.lastname: Williams
mesh_terms: D001426:Bacterial Proteins / Q000378:metabolism / Q000502:physiology*; D001431:Bacteriological Techniques; D001692:Biological Transport / Q000187:drug effects / Q000502:physiology; D002455:Cell Division / Q000187:drug effects; D006880:Hydroxy Acids / Q000494:pharmacology*; D007501:Iron / Q000378:metabolism*; D007651:Keto Acids / Q000494:pharmacology*; D008565:Membrane Proteins / Q000502:physiology*; D012475:Salmonella / Q000254:growth & development / Q000378:metabolism*; D012477:Salmonella enteritidis / Q000166:cytology / Q000378:metabolism; D012482:Salmonella paratyphi A / Q000166:cytology / Q000378:metabolism; D012486:Salmonella typhimurium / Q000166:cytology / Q000378:metabolism; D017262:Siderophores / Q000502:physiology
chemical_list: D001426:Bacterial Proteins; D006880:Hydroxy Acids; D007651:Keto Acids; D008565:Membrane Proteins; D017262:Siderophores; C057616:tonB protein, Bacteria; D007501:Iron