Abstract
Pisum sativum cv. Rondo seeds were found to contain two lectins, one of which seemed to be the mannosylated derivative of the other. Hapten-inhibited binding to human A erythrocytes and to Rhizobium leguminosarum by both lectins seemed to be identical; appropriate haptens are (α-linked) sugars with unsubstituted C-4- and C-6-hydroxyls in the same stereochemical position as with glucose or mannose. Pea root slime contained at least two glucose-binding proteins, one of which is a Rhizobium leguminosarum-agglutinating lectin with the same electrophoretic mobility as the glycosylated seed lectin. Both glucose-binding protein fractions were co-purified with a carbohydrate fraction of glucan nature. The role of pea lectins in the recognition of Rhizobium leguminosarum is discussed.
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