Protein V, a novel type-II IgG receptor from Streptococcus sp.: sequence, homologies and putative Fc-binding site.

We have cloned and sequenced the Fc-receptor-encoding gene, fcrV, from a group G streptococcus. Considerable sim¬ilarity was revealed between the FcRV, FcRA76 and M proteins of group A streptococci in their signal sequences and 3' termini, and between the Fc-binding regions of FcRV and FcRA76. The promoter and terminator regions showed no ho¬mology with those of the fcrA76 and M protein-encoding genes. The A1-A4 domains of FcRV (protein V) exhibit a heptapeptide repeat motif which is characteristic of α-helical coiled-coil proteins. The sequence, Ser-Asn-Arg-Ala-Ala, in the outer position, 'f' of each domain, is highly conserved and may be involved in FcR-IgG interactions. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/1758