Journal
JOURNAL OF BACTERIOLOGY
Volume 188, Issue 18, Pages 6703-6708Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/JB.00799-06
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Flagellar operons are divided into three classes with respect to their transcriptional hierarchy in Salmonella enterica serovar Typhimurium. The class I gene products FlhD and FlhC act together in an FlhD,C, heterotetramer, which binds upstream of the class 2 promoters to facilitate binding of RNA polymerase. Class 2 expression is known to be enhanced by a disruption mutation in a flagellar gene,fliT. In this study, we purified FliT protein in a His-tagged form and showed that the protein prevented binding of FlhD,C, to the class 2 promoter and inhibited FlhD(2)C(2)-dependent transcription. Pull-down and far-Western blotting analyses revealed that the FliT protein was capable of binding to FlhD,C, and FlhC and not to FlhD alone. We conclude that FliT acts as an anti-FlhD(2)C(2) factor, which binds to FlhD(2)C(2) through interaction with the FlhC subunit and inhibits its binding to the class 2 promoter.
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