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. 1987 Dec;55(12):3011–3016. doi: 10.1128/iai.55.12.3011-3016.1987

Characterization by affinity electrophoresis of an alpha-1,6-glucan-binding protein from Streptococcus sobrinus.

E C Landale 1, M M McCabe 1
PMCID: PMC260021  PMID: 2445685

Abstract

Glucan-binding protein 1 (GBP1), the most abundant glucan-binding protein isolated from culture supernatants of Streptococcus sobrinus 6715-49, has been purified by affinity chromatography on Sephadex G-50 followed by gel permeation chromatography with Bio-Gel P-10. The specificity and affinity of GBP1 for glucans were assessed by affinity electrophoresis. GBP1 did not detectably bind to glucans lacking linear arrays of alpha-1,6 linkages. The association constant for the linear alpha-1,6-glucan Dextran T2000 was 3 x 10(7) M-1. Providing small isomaltosaccharide ligands to compete with this dextran indicated that the binding site maximally accommodated isomaltosaccharides with a degree of polymerization of 8. When glucans produced by purified S. sobrinus glucosyltransferases were tested, GBP1 displayed the highest affinity for the glucan from the soluble-product, primer-independent glucosyltransferase.

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Selected References

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