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pubmed-article:9286993pubmed:abstractTextThe virulence plasmid-encoded spv regulon is essential for virulence of Salmonella dublin in mice. The spvR gene product belongs to the LysR family of transcriptional regulator proteins. SpvR induces the expression of the spvABCD operon and positively regulates its own expression. DNase I protection analysis with purified SpvR fusion proteins identified SpvR binding sites within the spvA and spvR promoters (P. Grob and D. G. Guiney, J. Bacteriol. 178:1813-1820, 1996). We have used PCR mutagenesis, combined with functional selection for reduced SpvR affinity, to define the DNA elements essential for SpvR binding. For the spvR promoter fragment, a screen for reduced expression was also applied. Sequence analysis of the resulting mutant fragments reveals that the base pair changes are clustered in distinct regions. Determination of the apparent dissociation constants of SpvR for the mutant promoters showed that the spvA LysR-type motif and the upstream palindromic sequences of both promoters play an important role in SpvR recognition.lld:pubmed
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pubmed-article:9286993pubmed:articleTitleMutational characterization of promoter regions recognized by the Salmonella dublin virulence plasmid regulatory protein SpvR.lld:pubmed
pubmed-article:9286993pubmed:affiliationDepartment of Medicine, School of Medicine, University of California at San Diego, La Jolla 92093-0640, USA.lld:pubmed
pubmed-article:9286993pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:9286993pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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