Linked Life Data

16735731

Source:http://linkedlifedata.com/resource/pubmed/id/16735731

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
Pt 6
pubmed:dateCreated
2006-5-31
pubmed:abstractText
The LysR-type transcriptional regulator MvfR (PqsR) (multiple virulence factor regulator) plays a critical role in Pseudomonas aeruginosa pathogenicity via the transcriptional regulation of multiple quorum-sensing (QS)-regulated virulence factors. LasR activates full mvfR transcription, and MvfR subsequently activates pqsA-E expression. This study identifies and characterizes the key cis-regulatory elements through which mvfR and pqsA-E transcription is regulated in the highly virulent P. aeruginosa strain PA14. Deletion and site-directed mutagenesis indicate that: (1) LasR activates mvfR transcription by binding to a las/rhl box, CTAACAAAAGACATAG, centred at -513 bp upstream of the MvfR translational start site; and (2) RhlR represses pqsA transcription by binding to a las/rhl box, CTGTGAGATTTGGGAG, centred at -311 bp upstream of the pqsA transcriptional initiation site. Furthermore, it is shown that MvfR activates pqsA-E transcription by binding to a LysR box, TTCGGACTCCGAA, centred at -45 bp relative to the pqsA transcriptional initiation site, demonstrating that this LysR box has a critical role in the physical interaction between the MvfR protein and the pqsA promoter. These results provide new insights into the regulatory relationships between LasR and mvfR, and between MvfR/RhlR and the pqs operon, and elucidate further the complex regulation of the P. aeruginosa QS circuitry.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
1350-0872
pubmed:author
pubmed:issnType
Print
pubmed:volume
152
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1679-86
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
2006
pubmed:articleTitle
Mutation analysis of the Pseudomonas aeruginosa mvfR and pqsABCDE gene promoters demonstrates complex quorum-sensing circuitry.
pubmed:affiliation
Department of Surgery, Microbiology and Molecular Genetics, Harvard Medical School, Boston, MA 02114, USA.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't