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. 1992 Oct;174(20):6404–6410. doi: 10.1128/jb.174.20.6404-6410.1992

Molecular genetic analysis of a class B periplasmic-flagellum gene of Treponema phagedenis.

R J Limberger 1, L L Slivienski 1, D B Yelton 1, N W Charon 1
PMCID: PMC207590  PMID: 1400192

Abstract

Treponema phagedenis is a host-associated spirochete with multiple polypeptides making up its periplasmic flagella (PFs). Each PF has a 39-kDa polypeptide making up the sheath (class A PF polypeptide) and two to four antigenically similar 33- to 34-kDa polypeptide species making up the core (class B PF polypeptides). A genetic analysis of the PF-deficient mutants T-40 and T-55 has shown that the PFs are involved in motility. To better understand the synthesis and assembly of these complex organelles and to compare the PF genes with those of other spirochetes, we cloned and characterized the T. phagedenis flaB2 gene, which encodes one class B polypeptide. The flaB2 gene consists of an open reading frame of 858 nucleotides capable of encoding a protein of 31.5 kDa. The predicted amino acid sequence of the FlaB2 polypeptide was 92% identical to that of T. pallidum FlaB2, with a 76% identity at the nucleotide level. These results confirm previous immunological and N-terminal-sequence analyses which suggested that the PF genes are well conserved in the spirochetes. Primer extension analysis of T. phagedenis flaB2 indicated that the start site of transcription was 127 nucleotides upstream from the ATG initiation codon. Preceding the start site is a DNA sequence similar to the sigma 28 consensus promoter sequence commonly found associated with motility genes. Northern (RNA) blots probed with a segment of flaB2 DNA revealed a 1,000-nucleotide monocistronic transcript in the wild type and in PF-deficient mutants T-40 and T-55. DNA sequencing of most of the flaB2 gene of the mutants revealed no differences from the wild-type gene. Because the mutants fail to synthesize detectable class B PF polypeptides yet synthesize extensive amounts of flaB2 mRNA, PF synthesis in T. phagedenis is likely to involve regulation at the translational level.

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Selected References

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