Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2000-10-18
pubmed:abstractText
The genome sequence of Helicobacter pylori suggests that this bacterium possesses several Fe acquisition systems, including both Fe2+- and Fe3+-citrate transporters. The role of these transporters was investigated by generating insertion mutants in feoB, tonB, fecA1 and fecDE. Fe transport in the feoB mutant was approximately 10-fold lower than in the wild type (with 0.5 microM Fe), irrespective of whether Fe was supplied in the Fe2+ or Fe3+ form. In contrast, transport rates were unaffected by the other mutations. Complementation of the feoB mutation fully restored both Fe2+ and Fe3+ transport. The growth inhibition exhibited by the feoB mutant in Fe-deficient media was relieved by human holo-transferrin, holo-lactoferrin and Fe3+-dicitrate, but not by FeSO4. The feoB mutant had less cellular Fe and was more sensitive to growth inhibition by transition metals in comparison with the wild type. Biphasic kinetics of Fe2+ transport in the wild type suggested the presence of high- and low-affinity uptake systems. The high-affinity system (apparent Ks = 0.54 microM) is absent in the feoB mutant. Transport via FeoB is highly specific for Fe2+ and was inhibited by FCCP, DCCD and vanadate, indicating an active process energized by ATP. Ferrozine inhibition of Fe2+ and Fe3+ uptake implied the concerted involvement of both an Fe3+ reductase and FeoB in the uptake of Fe supplied as Fe3+. Taken together, the results are consistent with FeoB-mediated Fe2+ uptake being a major pathway for H. pylori Fe acquisition. feoB mutants were unable to colonize the gastric mucosa of mice, indicating that FeoB makes an important contribution to Fe acquisition by H. pylori in the low-pH, low-O2 environment of the stomach.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
http://linkedlifedata.com/resource/pubmed/chemical/Bacterial Proteins, http://linkedlifedata.com/resource/pubmed/chemical/Carrier Proteins, http://linkedlifedata.com/resource/pubmed/chemical/Cation Transport Proteins, http://linkedlifedata.com/resource/pubmed/chemical/Escherichia coli Proteins, http://linkedlifedata.com/resource/pubmed/chemical/FMN Reductase, http://linkedlifedata.com/resource/pubmed/chemical/FecB protein, E coli, http://linkedlifedata.com/resource/pubmed/chemical/Ferric Compounds, http://linkedlifedata.com/resource/pubmed/chemical/Ferrous Compounds, http://linkedlifedata.com/resource/pubmed/chemical/Ferrozine, http://linkedlifedata.com/resource/pubmed/chemical/Ion Pumps, http://linkedlifedata.com/resource/pubmed/chemical/Iron Chelating Agents, http://linkedlifedata.com/resource/pubmed/chemical/Membrane Proteins, http://linkedlifedata.com/resource/pubmed/chemical/NADH, NADPH Oxidoreductases, http://linkedlifedata.com/resource/pubmed/chemical/Siderophores, http://linkedlifedata.com/resource/pubmed/chemical/ferric citrate iron reductase, http://linkedlifedata.com/resource/pubmed/chemical/tonB protein, Bacteria, http://linkedlifedata.com/resource/pubmed/chemical/tonB protein, E coli
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0950-382X
pubmed:author
pubmed:issnType
Print
pubmed:volume
37
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
274-86
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed-meshheading:10931324-Animals, pubmed-meshheading:10931324-Bacterial Proteins, pubmed-meshheading:10931324-Biological Transport, Active, pubmed-meshheading:10931324-Carrier Proteins, pubmed-meshheading:10931324-Cation Transport Proteins, pubmed-meshheading:10931324-Escherichia coli Proteins, pubmed-meshheading:10931324-FMN Reductase, pubmed-meshheading:10931324-Ferric Compounds, pubmed-meshheading:10931324-Ferrous Compounds, pubmed-meshheading:10931324-Ferrozine, pubmed-meshheading:10931324-Helicobacter Infections, pubmed-meshheading:10931324-Helicobacter pylori, pubmed-meshheading:10931324-Humans, pubmed-meshheading:10931324-Ion Pumps, pubmed-meshheading:10931324-Ion Transport, pubmed-meshheading:10931324-Iron Chelating Agents, pubmed-meshheading:10931324-Kinetics, pubmed-meshheading:10931324-Membrane Proteins, pubmed-meshheading:10931324-Mice, pubmed-meshheading:10931324-Mice, Inbred Strains, pubmed-meshheading:10931324-Mutagenesis, Insertional, pubmed-meshheading:10931324-NADH, NADPH Oxidoreductases, pubmed-meshheading:10931324-Oxidation-Reduction, pubmed-meshheading:10931324-Siderophores, pubmed-meshheading:10931324-Virulence
pubmed:year
2000
pubmed:articleTitle
Iron acquisition and virulence in Helicobacter pylori: a major role for FeoB, a high-affinity ferrous iron transporter.
pubmed:affiliation
Department of Molecular Biology and Biotechnology, University of Sheffield, Firth Court, Western Bank, Sheffield S10 2TN, UK.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't