Lectins from the seeds of broad bean (Vicia faba L.), pea (Pisum sativum L.), common vetch (V. sativa L.), and lentil (Lens culinaris Medik.) were isolated and purified by affinity chromatography. The hemagglutinating activity of lectins was most effectively inhibited by methyl-α-D-mannopyranoside, trehalose, and D-mannose. Other carbohydrate haptens, such as methyl-α-D-glucopyranoside, maltose, and alginic and D-glucuronic acids were less effective. Two lectins obtained from different lentil cultivars, unlike other lectins, had a relatively high affinity for melecitose, N-acetyl-D-glucosamine, L-sorbose, and sucrose. Furthermore, these lectins interacted with soluble starch. All the lectins examined had similar, but not identical, carbohydrate-binding properties. Because of their similar D-mannose/D-glucose specificity, these lectins interacted with lipopolysaccharides and exopolysaccharides of Rhizobium leguminosarum bv. viciae, root nodule bacteria that infect broad-bean, pea, common-vetch, and lentil plants with the formation of nitrogen-fixing symbiosis. However, owing to individual distinctions of carbohydrate-binding properties, these lectins showed a higher affinity for the polysaccharides of those microsymbionts within the R. leguminosarum bv. viciae species that were better specialized towards one or the other host plant from the cross inoculation group of legumes.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 13, 2004
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