Abstract
Glucan-binding proteins (3) were isolated from the extracellular fluid of cultures of S. mutans serotype c. These proteins were adsorbed to glucans containing 1,3-.alpha. or 1,6-.alpha. bonds and linked to various chromatographic supports: they were eluted from columns by a dextran solution. Glucosyltransferase acitity was associated with 2 of the glucan-binding proteins. [These proteins may be involved in adherence of S. mutans to dental surfaces and the formation of dental plaque].