T. Yokoseki et al., NEGATIVE REGULATION BY FLID, FLIS, AND FLIT OF THE EXPORT OF THE FLAGELLUM-SPECIFIC ANTI-SIGMA FACTOR, FLGM, IN SALMONELLA-TYPHIMURIUM, Journal of bacteriology, 178(3), 1996, pp. 899-901
The fliD operon of Salmonella typhimurium consists of three flagellar
genes, fliD, fliS, and fliT, and is transcribed in this order. It has
been shown that an fliD::Tn10 mutation causes an excess export of the
flagellum-specific anti-sigma factor, FlgM, resulting in an overexpres
sion of flagellar class 3 operons. In this study, using gene-disruptio
n mutants in the individual genes in the fliD operon, we showed that m
utations in any one of the genes in the operon enhanced both FlgM expo
rt and the expression of flagellar regulon. This indicates that all th
ree genes in the operon are involved in the negative regulation of Flg
M export.