5f5q
Crystal structure of Canavalia virosa lectin in complex with alpha-methyl-mannoside
Structural highlights
FunctionCONV_CANCT D-mannose/D-glucose-binding lectin which binds alpha-methyl-D-mannoside, D-mannose and D-glucose in that order (PubMed:24519628, PubMed:27737777). Also binds to serum fetuin and ovalbumin (PubMed:24519628). Has hemagglutinating activity towards rabbit erythrocytes (PubMed:24519628). Is not toxic towards larvae of the brine shrimp Artemia (PubMed:24519628). Induces relaxation in rat endothelized aorta (PubMed:24519628). Shows a transient edematogenic effect in rat (PubMed:27737777).[1] [2] Publication Abstract from PubMedA lectin from Canavalia virosa, Diocleinae subtribe, was purified by affinity chromatography with Sephadex G-50 matrix and named ConV. The primary structure of ConV was obtained by mass spectrometry and crystals were obtained by the vapor diffusion method at 293K and belonged to orthorhombic space group P21221 with two molecules in its asymmetric unit. The structure obtained presented Rfactor and Rfree of 18.91% and 24.92% respectively, with no residues in nonallowed regions of Ramachandran plot. The crystal structure was solved at 2.53A and was demonstrated to be very similar to other lectins from the same subtribe. In inflammatory tests, ConV elicited paw edema, but incubation of lectin with glucose beforehand was able to reduce the edematogenic effect, indicating the involvement of the carbohydrate recognition domain in this process. The lectin also showed toxicity to rat C6 glioma cells, disrupting the mitochondrial membrane potential (DeltaYm) and decreasing cell viability, indicating an anticancer potential for ConV. In silico studies confirmed that ConV interacts strongly with carbohydrates that comprise the N-glycans of glycoproteins. This finding corroborates the hypothesis which holds that the lectin domain interacts with glycans in molecular targets and that this contributes to the effects observed in biological activities. Structural characterization of a lectin from Canavalia virosa seeds with inflammatory and cytotoxic activities.,Osterne VJ, Silva-Filho JC, Santiago MQ, Pinto-Junior VR, Almeida AC, Barreto AA, Wolin IA, Nascimento AP, Amorim RM, Rocha BA, Delatorre P, Nagano CS, Leal RB, Assreuy AM, Nascimento KS, Cavada BS Int J Biol Macromol. 2016 Oct 11;94(Pt A):271-282. doi:, 10.1016/j.ijbiomac.2016.10.020. PMID:27737777[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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