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Static broth culture favors  Salmonella enterica  subsp.  enterica  serovar Typhimurium to produce type 1 fimbriae, while solid agar inhibits its expression. A transposon inserted in  stbC , which would encode an usher for Stb fimbriae of a non-flagellar  Salmonella enterica  subsp.  enterica  serovar Typhimurium LB5010 strain, conferred it to agglutinate yeast cells on both cultures. RT-PCR revealed that the expression of the fimbrial subunit gene  fimA , and  fimZ , a regulatory gene of  fimA , were both increased in the  stbC  mutant when grown on LB agar;  fimW , a repressor gene of  fimA , exhibited lower expression. Flagella were observed in the  stbC  mutant and this phenotype was correlated with the motile phenotype. Microarray data and RT-PCR indicated that the expression of three genes,  motA, motB , and  cheM , was enhanced in the  stbC  mutant. The  stbC  mutant was resistant to several antibiotics, consistent with the finding that expression of  yhcQ  and  ramA  was enhanced. A complementation test revealed that transforming a recombinant plasmid possessing the  stbC  restored the mannose-sensitive agglutination phenotype to the  stbC  mutant much as that in the parental  Salmonella enterica  subsp.  enterica  serovar Typhimurium LB5010 strain, indicating the possibility of an interplay of different fimbrial systems in coordinating their expression.

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A Constitutively Mannose-Sensitive AgglutinatingSalmonella entericasubsp.entericaSerovar Typhimurium Strain, Carrying a Transposon in the Fimbrial Usher GenestbC, Exhibits Multidrug Resistance and Flagellated Phenotypes