Characterization of a Lectin from the Leaves of Great Northern Bean,<i>Phaseolus vulgaris</i>L.

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  • Characterization of a Lectin from the Leaves of Great Northern Bean, Phaseolus vulgaris L.

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A novel lectin (GNLL) was isolated from the leaves of the Great Northern bean, Phaseolus vulgaris. GNLL was purified by affinity chromatography on ovomucoid-Sepharose 4B. GNLL had a molecular mass of 135 kDa on gel filtration and gave two bands on SDS-polyacrylamide gel electrophoresis (PAGE) (band A of 34.0 kDa and band B of 34.2 kDa). Binding assay of horseradish peroxidase (HRP)-glycoproteins to the bands electroblotted onto polyvinylidene difluoride (PVDF) membrane showed that both bands could bind to complex-type N-linked oligosaccharide chains in glycoproteins. The N-terminal amino acid sequences of both bands were identical through the 10 residues and identical to that of α-subunit of a pod lectin (pod-α-subunit) from the same bean. On the other hand, band B cross-reacted with monoclonal antibody against a seed lectin from the same bean, but band A did not.

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