The Streptococcal Binding Site in the Gelatin-binding Domain of Fibronectin is Consistent with a Non-linear Arrangement of Modules

Kate E. Atkin, Andrew S. Brentnall, Gemma Harris, Richard J. Bingham, Michele C. Erat, Christopher J. Millard, Ulrich Schwarz-Linek, David Staunton, Ioannis Vakonakis, Iain D. Campbell, Jennifer R. Potts

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Fibronectin-binding proteins (FnBPs) of Staphylococcus aureus and Streptococcus pyogenes mediate invasion of human endothelial and epithelial cells in a process likely to aid the persistence and/or dissemination of infection. In addition to binding sites for the N-terminal domain (NTD) of fibronectin (Fn), a number of streptococcal FnBPs also contain an upstream region (UR) that is closely associated with an NTD-binding region; UR binds to the adjacent gelatin-binding domain (GBD) of Fn. Previously, UR was shown to be required for efficient streptococcal invasion of epithelial cells. Here we show, using a Streptococcus zooepidemicus FnBP, that the UR-binding site in GBD resides largely in the 8F19F1 module pair. We also show that UR inhibits binding of a peptide from the α1 chain of type I collagen to 8F19F1 and that UR binding to 8F1 is likely to occur through anti-parallel β-zipper formation. Thus, we propose that streptococcal proteins that contain adjacent NTD- and GBD-binding sites form a highly unusual extended tandem β-zipper that spans the two domains and mediates high affinity binding to Fn through a large intermolecular interface. The proximity of the UR- and NTD-binding sequences in streptococcal FnBPs is consistent with a non-linear arrangement of modules in the tertiary structure of the GBD of Fn.

Original languageEnglish
Pages (from-to)36977-36983
Number of pages7
JournalJournal of Biological Chemistry
Volume285
Issue number47
DOIs
Publication statusPublished - 19 Nov 2010
Externally publishedYes

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