Parkia platycephala lectin 2 was purified from Parkia platycephala (Leguminosae, Mimosoideae) seeds by affinity chromatography and RP-HPLC. Equilibrium sedimentation and MS showed that Parkia platycephala lectin 2 is a nonglycosylated monomeric protein of molecular mass 29 407 ± 15 Da, which contains six cysteine residues engaged in the formation of three intramolecular disulfide bonds. Parkia platycephala lectin 2 agglutinated rabbit erythrocytes, and this activity was specifically inhibited by N-acetylglucosamine. In addition, Parkia platycephala lectin 2 hydrolyzed β(1-4) glycosidic bonds linking 2-acetoamido-2-deoxy-β-d-glucopyranose units in chitin. The full-length amino acid sequence of Parkia platycephala lectin 2, determined by N-terminal sequencing and cDNA cloning, and its three-dimensional structure, established by X-ray crystallography at 1.75 Å resolution, showed that Parkia platycephala lectin 2 is homologous to endochitinases of the glycosyl hydrolase family 18, which share the (βα)8 barrel topology harboring the catalytic residues Asp125, Glu127, and Tyr182. © 2006 The Authors.2731739623974Van Damme, E.J.M., Peumans, W.J., Barre, A., Rougé, P., Plant lectins: A composite of several distinct families of structurally and evolutionary related proteins with diverse biological roles (1998) Crit Rev Plant Sci, 17, pp. 575-692Gabius, H.-J., Gabius, S., (1997) Glycoscience. 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