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    J Bacteriol. 1997 Jan;179(2):552-6.

    An unexpected flaA homolog is present and expressed in Borrelia burgdorferi.

    Ge Y, Charon NW.

    Department of Microbiology and Immunology, West Virginia University, Morgantown 26506-9177, USA.

    Most investigators have assumed that the periplasmic flagella (PFs) of Borrelia burgdorferi are composed of only one flagellin protein. The PFs of most other spirochete species are complex: these PFs contain an outer sheath of FlaA proteins and a core filament of FlaB proteins. During an analysis of a chemotaxis gene cluster of B. burgdorferi 212, we were surprised to find a flaA gene homolog with a deduced polypeptide having 54 to 58% similarity to FlaA from other spirochetes. Like other FlaA proteins, B. burgdorferi FlaA has a conserved signal sequence at its N terminus. Based on reverse transcription-PCR and primer extension analysis, this flaA homolog and five chemotaxis genes constitute a motility-chemotaxis operon. Immunoblots using anti-FlaA serum from Treponema pallidum and a lysate of B. burgdorferi showed strong reactivity to a protein of 38.0 kDa, which is consistent with the expression of flaA in growing cells.

    PMID: 8990312 [PubMed - indexed for MEDLINE]

    PMCID: 178730

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