Linked Life Data

18971260

Source:http://linkedlifedata.com/resource/pubmed/id/18971260

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2009-2-27
pubmed:abstractText
The pneumococcal histidine triad (Pht) proteins are a recently recognized family of surface proteins, comprising 4 members: PhtA, PhtB, PhtD, and PhtE. They are being promoted for inclusion in a multicomponent pneumococcal protein vaccine currently under development, but to date, their biological functions and their relative contributions to pathogenesis have not been clarified. In this study, the involvement of these proteins in pneumococcal virulence was investigated in murine models of sepsis and pneumonia by using defined, nonpolar mutants of the respective genes in Streptococcus pneumoniae D39. In either challenge model, mutagenesis of all 4 genes was required to completely abolish virulence relative to the wild-type, suggesting significant functional redundancy among Pht proteins. The in vivo expression of pht genes was significantly up-regulated in the nasopharynx and lungs compared with blood. We provide unequivocal molecular evidence for Zn(2+)-dependent, AdcR-mediated, regulation of pht gene expression by real-time reverse transcriptase-polymerase chain reaction, Western blotting, and electrophoretic mobility-shift assays. We also present the first direct evidence for the biological function of this protein family by demonstrating that Pht proteins are required for inhibition of complement deposition on the pneumococcal surface through the recruitment of complement factor H.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
1530-6860
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
23
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
731-8
pubmed:meshHeading
pubmed:year
2009
pubmed:articleTitle
Pneumococcal histidine triad proteins are regulated by the Zn2+-dependent repressor AdcR and inhibit complement deposition through the recruitment of complement factor H.
pubmed:affiliation
School of Molecular and Biomedical Science, University of Adelaide, South Australia, 5005, Australia.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't