Conservation of surface epitopes in Pseudomonas aeruginosa outer membrane porin protein OprF

Nancy L. Martin, Eileen G. Rawling, Rebecca S.Y. Wong, Mae Rosok, Robert E.W. Hancock

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13 Citations (Scopus)


The outer membrane proteins of several prominent bacterial pathogens demonstrate substantial variation in their surface antigenic epitopes. To determine if this was also true for Pseudomonas aeruginosa outer membraine protein OprF, gene sequencing of a serotype 5 isolate was performed to permit comparison with the published serotype 12 oprF gene sequence. Only 16 nucleotide substitutions in the 1053 nucleotide coding region were observed; none of these changed the amino acid sequence. A panel of 10 monoclonal antibodies (mAbs) reacted with each of 46 P. aeruginosa strains representing all 17 serotype strains, 12 clinical isolates, 15 environmental isolates and 2 laboratory isolates. Between two and eight of these mAbs also reacted with proteins from representatives of the rRNA homology group I of the Pseudomonadaceae. Nine of the ten mAbs recognized surface antigenic epitopes as determined by indirect immunofluorescence techniques and their ability to opsonize P. aeuroginosa for phagocytosis. These epitopes were partially masked by lipopolysacharide side chains as revealed using a side chain-deficient mutant. It is concluded that OprF is a highly conserved protein with several conserved surface antigenic epitopes.

Original languageEnglish
Pages (from-to)261-266
Number of pages6
JournalFEMS Microbiology Letters
Issue number3
Publication statusPublished or Issued - 1 Nov 1993
Externally publishedYes


  • Epitope
  • OprF
  • Outer membrane
  • Porin
  • pseudomonas aeruginosa

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology
  • Genetics

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