1887

Abstract

Summary: During screening of a gene library of type M15 for fibrinogen-binding material, a protein of approximately 100 kDa, encoded outside the region, was found. DNA sequencing revealed this component to be identical to protein F, a fibronectin-binding protein. Isolation of the recombinant protein, termed F15, was performed by the use of fibrinogen affinity chromatography. The affinity constant ( ) of protein F15 for fibrinogen, 1.25 x 10 mol, was lower than that for fibronectin, 1.8 x 10 mol. The fibrinogen-binding domain was located in the N-terminal part of the molecule, while the fibronectin-binding domains, as previously determined, were in the C-terminal portion of protein F. To examine the amino acid sequence heterogeneity of protein F, the 5′ part of the gene, corresponding to the N-terminal variable region of the protein, was amplified by PCR from 12 strains of belonging to six different M-types. Alignment of these nucleotide sequences indicated that the 5′ portion of the gene had probably undergone a number of intragenic recombination and horizontal gene transfer events, allowing a pattern of structural diversity of protein F observed earlier for some other streptococcal virulence factors. There was no strict correlation between M-type and nucleotide sequence of the variable region of the gene and, compared to streptococcal M protein, the overall variation observed for protein F appeared more limited.

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1998-01-01
2021-05-18
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