A novel cell-binding mechanism of Moraxella catarrhalis ubiquitous surface protein UspA: specific targeting of the N-domain of carcinoembryonic antigen-related cell adhesion molecules by UspA1

DJ Hill, M Virji*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

113 Citations (Scopus)

Abstract

Carcinoembryonic antigen-related cell adhesion molecules (CEACAMs) are receptors for several Neisseria and Haemophilus spp. In this investigation, we demonstrate that a major outer membrane protein of Moraxella catarrhalis (Mx) strains, belonging to the ubiquitous surface protein (Usp) family, also interacts with the receptor. The interaction was demonstrated in Western blot overlay of SDS-PAGE-separated bacterial proteins using soluble receptor constructs as well as by co-precipitation experiments. The identity of the bacterial ligand was further ascertained by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). It was shown to belong to the UspA1 subfamily. In general, antibodies raised against synthetic UspA1, but not UspA2, peptides bound to the Mx ligand. CEACAM1-Fc-binding property could be demonstrated in all the clinical isolates examined but varied between strains. A single colony derivative of an Mx isolate was also demonstrated to bind to transfected Chinese hamster ovary and some human respiratory epithelial cells in a CEACAM-dependent manner. Thus, we have identified the third respiratory pathogen with the capacity to target the CEACAM family of receptors. The Mx ligand is structurally unrelated to those of Neisseria and Haemophilus.

Translated title of the contributionA novel cell-binding mechanism of Moraxella catarrhalis ubiquitous surface protein UspA: specific targeting of the N-domain of carcinoembryonic antigen-related cell adhesion molecules by UspA1
Original languageEnglish
Pages (from-to)117-129
Number of pages13
JournalMolecular Microbiology
Volume48
Issue number1
DOIs
Publication statusPublished - Apr 2003

Bibliographical note

Publisher: Blackwell Scientific

Keywords

  • NONTYPABLE HAEMOPHILUS-INFLUENZAE
  • CROSS-REACTING ANTIGEN
  • BRANHAMELLA-CATARRHALIS
  • NEISSERIA-MENINGITIDIS
  • ESCHERICHIA-COLI
  • OPA PROTEINS
  • ENDOTHELIAL-CELLS
  • EPITHELIAL-CELLS
  • TYPE-1 FIMBRIAE
  • CEA FAMILY

Fingerprint Dive into the research topics of 'A novel cell-binding mechanism of <i>Moraxella catarrhalis </i>ubiquitous surface protein UspA: specific targeting of the N-domain of carcinoembryonic antigen-related cell adhesion molecules by UspA1'. Together they form a unique fingerprint.

Cite this