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PMID:12055288
| Citation |
Matz, C, van Vliet, AH, Ketley, JM and Penn, CW (2002) Mutational and transcriptional analysis of the Campylobacter jejuni flagellar biosynthesis gene flhB. Microbiology (Reading, Engl.) 148:1679-85 |
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| Abstract |
A Campylobacter jejuni gene encoding a homologue of the flagellar biosynthesis gene flhB was identified downstream of the peroxide stress defence gene ahpC. Insertional mutagenesis of the flhB gene rendered C. jejuni non-motile, with most cells aflagellate, although a small number expressed truncated flagella. The absence of FlhB also appeared to affect cell shape, as the majority of cells were straight rather than curved rods. Transcription of the flagellin gene flaA was significantly reduced in the C. jejuni flhB mutants, which also did not express significant amounts of flagellin proteins, indicating that FlhB is an essential protein for subsequent expression of flagellar genes. The transcription start site of the flhB gene, as determined by primer extension, was located 91 bp upstream of the flhB start codon, but no recognizable promoter sequence could be identified immediately upstream of this transcription start site. Transcriptional flhB::lacZ reporter gene fusions confirmed that the flhB gene has its own promoter region, is expressed at very low levels and is transcribed independently of ahpC, and that its transcription is not regulated by iron or growth phase. |
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| Keywords |
Bacterial Proteins/biosynthesis; Bacterial Proteins/genetics; Campylobacter jejuni/genetics; Campylobacter jejuni/growth & development; Campylobacter jejuni/physiology; Campylobacter jejuni/ultrastructure; Flagella/genetics; Flagellin/biosynthesis; Flagellin/genetics; Gene Expression Regulation, Bacterial; Genes, Bacterial/genetics; Genes, Reporter; Genome, Bacterial; Membrane Proteins; Movement; Mutation/genetics; Promoter Regions, Genetic/genetics; Transcription, Genetic/genetics |
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Significance
Annotations
| Gene product | Qualifier | GO Term | Evidence Code | with/from | Aspect | Extension | Notes | Status |
|---|---|---|---|---|---|---|---|---|
| GO:1902210: positive regulation of bacterial-type flagellum assembly |
ECO:0000315: mutant phenotype evidence used in manual assertion |
P |
Figure 2: Electron microscopy images show that C. jejuni flhB mutants lack flagella while wild type C. jejuni have normal flagella and normal cell shape. Figure 3a: Western immunoblot probed with a flagellum-specific monoclonal antibody (P2D3) show that flhB mutants do not express FlaA (a flagellar protein). This decreased expression of flagellar proteins in flhB mutants is believed to partly cause the lack of motility. |
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