Plant lectins are a heterogeneous group of proteins or
glycoproteins that share in common their ability to recognize and
bind specific sugar residues. At present hundreds of plant lectins
have been isolated and characterized with respect to their
molecular structures and carbohydrate-binding specificities. Since
the unique biological properties of lectins can be exploited in the
investigation of numerous biochemical and cellular phenomena,
intense efforts are being made in many labs to isolate lectins with
unique and unusual sugar-binding specificities. The study deals
with the purification and partial characterization of a lectin from
Crotalaria pallida belonging to Leguminoseae. Conformational
changes and changes in biological properties by chemical
modification of the lectin are also a part of the study. The lectin
is a monomeric galactose and blood group A specific glycoprotein
with about 4% carbohydrate and a molecular weight of 43 kDa. The
activity yield of the lectin was about 4.6% with nearly three fold
purification. Conformational changes were investigated by gel
filtration, viscometery and UV absorption spectroscopy.
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