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. 1988 Apr;170(4):1575–1581. doi: 10.1128/jb.170.4.1575-1581.1988

Flagellar transcriptional activators FlbB and FlaI: gene sequences and 5' consensus sequences of operons under FlbB and FlaI control.

D H Bartlett 1, B B Frantz 1, P Matsumura 1
PMCID: PMC211004  PMID: 2832369

Abstract

The regulation of the expression of the operons in the flagella-chemotaxis regulon in Escherichia coli has been shown to be a highly ordered cascade which closely parallels the assembly of the flagellar structure and the chemotaxis machinery (T. Iino, Annu. Rev. Genet. 11:161-182, 1977; Y. Komeda, J. Bacteriol. 168: 1315-1318). The master operon, flbB, has been sequenced, and one of its gene products (FlaI) has been identified. On the basis of the deduced amino acid sequence, the FlbB protein has similarity to an alternate sigma factor which is responsible for expression of flagella in Bacillus subtilis. In addition, we have sequenced the 5' regions of a number of flagellar operons and compared these sequences with the 5' region of flagellar operons directly and indirectly under FlbB and FlaI control. We found both a consensus sequence which has been shown to be in all other flagellar operons (J. D. Helmann and M. J. Chamberlin, Proc. Natl. Acad. Sci. USA 84:6422-6424) and a derivative consensus sequence, which is found only in the 5' region of operons directly under FlbB and FlaI control.

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Selected References

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