Crystal structure of CbpF, a bifunctional choline-binding protein and autolysis regulator from Streptococcus pneumoniae

Rafael Molina, Ana González, Meike Stelter, Inmaculada Pérez-Dorado, Richard Kahn, María Morales, Miriam Moscoso, Susana Campuzano, Nuria E Campillo, Shahriar Mobashery, José L García, Pedro García, Juan A Hermoso

38 Citations (Scopus)

Abstract

Phosphorylcholine, a crucial component of the pneumococcal cell wall, is essential in bacterial physiology and in human pathogenesis because it binds to serum components of the immune system and acts as a docking station for the family of surface choline-binding proteins. The three-dimensional structure of choline-binding protein F (CbpF), one of the most abundant proteins in the pneumococcal cell wall, has been solved in complex with choline. CbpF shows a new modular structure composed both of consensus and non-consensus choline-binding repeats, distributed along its length, which markedly alter its shape, charge distribution and binding ability, and organizing the protein into two well-defined modules. The carboxy-terminal module is involved in cell wall binding and the amino-terminal module is crucial for inhibition of the autolytic LytC muramidase, providing a regulatory function for pneumococcal autolysis.

Original languageEnglish
JournalEMBO Reports
Volume10
Issue number3
Pages (from-to)246-51
Number of pages6
ISSN1469-221X
DOIs
Publication statusPublished - Mar 2009

Keywords

  • Amino Acid Sequence
  • Autolysis
  • Bacterial Proteins/chemistry
  • Choline/metabolism
  • Crystallography, X-Ray
  • Humans
  • Models, Molecular
  • Molecular Sequence Data
  • N-Acetylmuramoyl-L-alanine Amidase/metabolism
  • Peptidoglycan/metabolism
  • Protein Structure, Tertiary
  • Receptors, Cell Surface/chemistry
  • Sequence Alignment
  • Streptococcus pneumoniae/genetics

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