Structural and Functional Analysis of Cell Wall-Anchored PolypeptideAdhesin BspA in Streptococcus agalactiae

Sara Rego, Timothy J Heal, Grace R Pidwill, Marisa Till, Alice Robson, Richard Lamont, Richard B Sessions, Howard F Jenkinson, Paul R Race*, Angela H Nobbs

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

21 Citations (Scopus)
264 Downloads (Pure)

Abstract

Streptococcus agalactiae (Group B Streptococcus, GBS) is the predominant cause of early-onset infectious disease in neonates and is responsible for life threatening infections in elderly and immune-compromised individuals. Clinical manifestations of GBS infection include sepsis, pneumonia and meningitis. Here we describe BspA, a deviant antigen I/II family polypeptide that confers adhesive properties linked to pathogenesis in GBS. Heterologous expression of BspA on the surface of the non-adherent bacterium Lactococcus lactis confers adherence to scavenger receptor gp340, human vaginal epithelium, and to the fungus Candida albicans. Complementary crystallographic and biophysical characterization of BspA reveal a novel β-sandwich adhesion domain and unique asparagine-dependent super-helical stalk. Collectively these findings establish a new bacterial adhesin structure that has in effect been hijacked by a pathogenic Streptococcus species to provide competitive advantage in human mucosal infections.
Original languageEnglish
Pages (from-to)15985-16000
Number of pages16
JournalJournal of Biological Chemistry
Volume291
Issue number31
Early online date15 Jun 2016
DOIs
Publication statusPublished - 29 Jul 2016

Keywords

  • adhesin
  • AgI/II polypeptide
  • Streptococcus
  • virulence factor
  • Candida albicans
  • crystallography
  • circular dichroism (CD)
  • isothermal titration calorimetry (ITC)
  • molecular dynamics

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