Human C4b-binding protein, structural basis for interaction with streptococcal M protein, a major bacterial virulence factor
Författare
Summary, in English
Human C4b-binding protein (C4BP) protects host tissue, and those pathogens able to hijack this plasma glycoprotein, from complement-mediated destruction. We now show that the first two complement control protein (CCP) modules of the C4BP alpha-chain, plus the four residues connecting them, are necessary and sufficient for binding a bacterial virulence factor, the Streptococcus pyogenes M4 (Arp4) protein. Structure determination by NMR reveals two tightly coupled CCP modules in an elongated arrangement within this region of C4BP. Chemical shift perturbation studies demonstrate that the N-terminal, hypervariable region of M4 binds to a site including strand 1 of CCP module 2. This interaction is accompanied by an intermodular reorientation within C4BP. We thus provide a detailed picture of an interaction whereby a pathogen evades complement.
Avdelning/ar
Publiceringsår
2006
Språk
Engelska
Sidor
3690-3697
Publikation/Tidskrift/Serie
Journal of Biological Chemistry
Volym
281
Issue
6
Dokumenttyp
Artikel i tidskrift
Förlag
American Society for Biochemistry and Molecular Biology
Ämne
- Medicinal Chemistry
- Microbiology in the medical area
Status
Published
Forskningsgrupp
- Clinical Chemistry, Malmö
- Host-Pathogen Interactions
ISBN/ISSN/Övrigt
- ISSN: 1083-351X