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• W2096097113 abstract "In Caulobacter crescentus, the alternative sigma factor sigma54 plays an important role in the expression of late flagellar genes. Sigma54-dependent genes are temporally and spatially controlled, being expressed only in the swarmer pole of the predivisional cell. The only sigma54 activator described so far is the FlbD protein, which is involved in activation of the class III and IV flagellar genes and repression of the fliF promoter. To identify new roles for sigma54 in the metabolism and differentiation of C. crescentus, we cloned and characterized a gene encoding a putative sigma54 activator, named tacA. The deduced amino acid sequence from tacA has high similarity to the proteins from the NtrC family of transcriptional activators, including the aspartate residues that are phosphorylated by histidine kinases in other activators. The promoter region of the tacA gene contains a conserved sequence element present in the promoters of class II flagellar genes, and tacA shows a temporal pattern of expression similar to the patterns of these genes. We constructed an insertional mutant that is disrupted in tacA (strain SP2016), and an analysis of this strain showed that it has all polar structures, such as pili, stalk, and flagellum, and displays a motile phenotype, indicating that tacA is not involved in the flagellar biogenesis pathway. However, this strain has a high percentage of filamentous cells and shows a clear-plaque phenotype when infected with phage phiCb5. These results suggest that the TacA protein could mediate the effect of sigma54 on a different pathway in C. crescentus." @default.
• W2096097113 created "2016-06-24" @default.
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• W2096097113 date "1997-09-01" @default.
• W2096097113 modified "2023-09-26" @default.
• W2096097113 title "A gene coding for a putative sigma 54 activator is developmentally regulated in Caulobacter crescentus" @default.
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• W2096097113 doi "https://doi.org/10.1128/jb.179.17.5502-5510.1997" @default.
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