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. 1996 Mar 1;15(5):989–998.

A two-domain mechanism for group A streptococcal adherence through protein F to the extracellular matrix.

V Ozeri 1, A Tovi 1, I Burstein 1, S Natanson-Yaron 1, M G Caparon 1, K M Yamada 1, S K Akiyama 1, I Vlodavsky 1, E Hanski 1
PMCID: PMC449993  PMID: 8605894

Abstract

Streptococcus pyogenes binds to the extracellular matrix (ECM) and a variety of host cells and tissues, causing diverse human diseases. Protein F, a S.pyogenes adhesin that binds fibronectin (Fn), contains two binding domains. A repeated domain (RD2) and an additional domain (UR), located immediately N-terminal to RD2. Both domains are required for maximal Fn binding. In this study, we characterize RD2 and UR precisely and compare their functions and binding sites in Fn. The minimal functional unit of RD2 is of 44 amino acids, with contributions from two adjacent RD2 repeats flanked by a novel 'MGGQSES' motif. RD2 binds to the N-terminal fibrin binding domain of Fn. UR contains 49 amino acids, of which six are from the first repeat of RD2. It binds to Fn with higher affinity than RD2, and recognizes a larger fragment that contains fibrin and collagen binding domains. Expression of UR and RD2 independently on the surface-exposed region of unrelated streptococcal protein demonstrates that both mediate adherence of the bacteria to the ECM. We describe here a mechanism of adherence of a pathogen that involves two pairs of sites located on a single adhesin molecule and directed at the same host receptor.

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Selected References

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