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. 1995 Apr 18;14(8):1674–1679. doi: 10.1002/j.1460-2075.1995.tb07156.x

Protein H--a bacterial surface protein with affinity for both immunoglobulin and fibronectin type III domains.

I M Frick 1, K L Crossin 1, G M Edelman 1, L Björck 1
PMCID: PMC398260  PMID: 7737120

Abstract

Several bacterial species express surface proteins with affinity for the constant region (Fc) of immunoglobulin (Ig) G. The biological consequences of the interaction with IgG are poorly understood but it has been demonstrated that genes encoding different IgG Fc-binding proteins have undergone convergent evolution, suggesting that these surface molecules are connected with essential microbial functions. One of the molecules, protein H, is present in some strains of Streptococcus pyogenes, the most significant streptococcal species in clinical medicine. In contrast to other Ig-binding bacterial proteins tested, protein H was found to interact also with the neural cell adhesion molecule (N-CAM), a eukaryotic cell surface glycoprotein mediating homo- and heterophilic cell-cell interactions. The affinity for the interaction between protein H and N-CAM was 1.6 x 10(8)/M and the binding site on protein H was mapped to the NH2-terminal 80 amino acid residues. N-CAM and IgG are both members of the Ig superfamily and analogous to N-CAM, IgG binds to the NH2-terminal part of protein H. However, the binding sites for the two proteins were found to be separate, an unexpected result which was explained by the observation that the fibronectin type III (FNIII) domains and not the Ig-like domains of N-CAM are responsible for the interaction with protein H. Thus, the binding of N-CAM to protein H was blocked with fibronectin but not with IgG. Moreover, apart from fibronectin itself and N-CAM, fragments of fibronectin and the matrix protein cytotactin/tenascin containing FNIII domains also showed affinity for protein H.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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