Identification and characterization of complete RTX operons in Moraxella bovoculi and Moraxella ovis

John A Angelos, Louise M. Ball, John F. Hess

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

To determine if Moraxella bovoculi (M. bovoculi), a recently characterized coccoid Moraxella that was isolated from the eyes of calves affected with infectious bovine keratoconjunctivitis (IBK), and Moraxella ovis (M. ovis), originally isolated from sheep with conjunctivitis, possessed genes encoding RTX proteins, genomic DNA was amplified with oligonucleotide primers targeting RTX operon genes of Moraxella bovis (M. bovis). Complete classical RTX operons composed of RTXCABD genes closely linked to a putative secretion accessory protein encoding gene (tolC) were identified in M. bovoculi and M. ovis and were designated mbvCABDtolC and movCABDtolC, respectively. These genes were closely related to M. bovis mbxCABDtolC. Polyclonal rabbit antiserum against the carboxy terminus of M. bovoculi MbvA neutralized hemolytic activity of both M. bovoculi and M. ovis; this antiserum did not neutralize the hemolytic activity of M. bovis. M. bovoculi and M. ovis possess genes that encode proteins related to pathogenic factors of M. bovis.

Original languageEnglish (US)
Pages (from-to)73-79
Number of pages7
JournalVeterinary Microbiology
Volume125
Issue number1-2
DOIs
StatePublished - Nov 15 2007

Keywords

  • Cattle
  • Cytotoxin
  • Hemolysin
  • IBK
  • Infectious bovine keratoconjunctivitis
  • Moraxella bovis
  • Moraxella bovoculi
  • Moraxella ovis
  • RTX operon
  • RTX toxin

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Microbiology
  • veterinary(all)

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