A 200 kDa protein is associated with haemagglutinating isolates of Moraxella (Branhamella) catarrhalis

Margaret Fitzgerald, Riona Mulcahy, Susan Murphy, Conor Keane, Davis Coakley, Thomas Scott

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


Moraxella catarrhalis adheres to human erythrocytes by means of a proteinaceous, trypsin sensitive, heat modifiable haemagglutinin. A 200 kDa protein was found to be associated with haemagglutinating isolates of M. catarrhalis. This protein was present on all haemagglutinating isolates (n = 17), but was absent on the non-haemagglutinating isolates (n = 23) examined. This protein demonstrated heat-modifiable properties in sodium dodecyl sulfate and was degraded by trypsin. Immunoblot assays with polyclonal antiserum indicated that the 200 kDa protein was associated exclusively with haemagglutinating isolates and antibodies to this protein did not recognise epitopes on non-haemagglutinating isolates. This protein, which appears to be a surface expressed protein may be a haemagglutinin of M. catarrhalis.

Original languageEnglish (US)
Pages (from-to)209-216
Number of pages8
JournalFEMS Immunology and Medical Microbiology
Issue number3
StatePublished - Jul 1997


  • Haemagglutination
  • Heat modifiability
  • Immunoblotting
  • Moraxella (Branhamella) catarrhalis
  • Surface protein

ASJC Scopus subject areas

  • Immunology and Allergy
  • Microbiology
  • Immunology
  • Microbiology (medical)
  • Infectious Diseases


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