Molecular mechanisms of Campylobacter fetus surface layer protein expression

Joel Dworkin, Martin J. Blaser

Research output: Contribution to journalReview articlepeer-review

64 Scopus citations

Abstract

Cells of the Gram-negative bacteria Campylobacter fetus are covered by monomolecular arrays of surface layer proteins (SLPs) critical for both persistence in their natural hosts and for virulence. For C. fetus cells, expression of SLPs essentially eliminates C3b binding and their antigenic variation thwarts host immunological defences. Each cell possesses multiple partially homologous and highly conserved SLP gene cassettes, tightly clustered in the genome, that encode SLPs of 97-149 kDa. These attach non-covalently via a conserved N-terminus to the cell wall lipopolysaccharide. Recent studies indicate that C. fetus reassorts a single promoter, controlling SLP expression, and one, or more, complete open reading frame strictly by DNA inversion, and that rearrangement is independent of the distance between sites of inversion. In contrast to previously reported programmed DNA inversion systems, inversion in C. fetus is recA-dependent. These rearrangements permit variation in protein expression from the family of SLP genes and suggest an expanding paradigm of programmed DNA rearrangements among microorganisms.

Original languageEnglish (US)
Pages (from-to)433-440
Number of pages8
JournalMolecular Microbiology
Volume26
Issue number3
DOIs
StatePublished - 1997
Externally publishedYes

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology

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