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. 1988 Sep;170(9):4119–4124. doi: 10.1128/jb.170.9.4119-4124.1988

Organization and temporal expression of a flagellar basal body gene in Caulobacter crescentus.

K M Hahnenberger 1, L Shapiro 1
PMCID: PMC211417  PMID: 2842303

Abstract

Caulobacter crescentus assembles a single polar flagellum at a defined time in the cell cycle. The protein components of the flagellar hook and filament are synthesized just prior to their assembly. We demonstrated that the expression of a gene, flaD, that is involved in the formation of the flagellar basal body is under temporal control and is transcribed relatively early in the cell cycle, before the hook and flagellin genes are transcribed. Thus, the order of flagellar gene transcription reflects the order of assembly of the protein components. A mutation in the flaD gene results in the assembly of a partial basal body which is missing the outermost P and L rings as well as the external hook and filament (K.M. Hahnenberger and L. Shapiro, J. Mol. Biol. 194:91-103, 1987). The flaD gene was cloned and characterized by nucleotide sequencing and S1 nuclease protection assays. In contrast to the protein components of the hook and filament, the protein encoded by the flaD gene contains a hydrophobic leader peptide. The predicted amino acid sequence of the leader peptide of flaD is very similar to the leader peptide of the flagellar basal body P ring of Salmonella typhimurium (M. Homma, Y. Komeda, T. Iino, and R.M. Macnab, J. Bacteriol. 169:1493-1498, 1987).

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Selected References

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