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Papers by Mu To

Research paper thumbnail of Further characterization and immunochemical studies on the carbohydrate specificity of jackfruit (Artocarpus integrifolia) lectin

Journal of Biological Chemistry, 1989

The lectin from jackfruit (Artocarpus integrifolia) seeds has been purified by Rivanol (6,9-diami... more The lectin from jackfruit (Artocarpus integrifolia) seeds has been purified by Rivanol (6,9-diamino-2ethoxyacridine lactate) treatment. The specific activity, molecular weights of parent lectin and its subunit, its glycoprotein nature, and hemagglutination-inhibition assays suggest that this preparation is identical to that obtained by affinity chromatography on melibiose-agarose adsorbent (Ahmed, H., and Chatterjee, B. P. (1986) in Lectins, Biology, Biochemistry, Clinical Biochemistry (B0g-Hansen, T. C., and van Driessche, E., eds) Vol. 5, pp. 125-133, Walter de Gruyter, New York). The lectin strongly agglutinates human and several animal erythrocytes. The lectin contains five isolectins of PI values 7.1, 6.85, 5.5, 5.3, and 5.1. It is thermally stable and loses its activity above 75 "C. The hemagglutinating activity remains unchanged in the presence of bivalent cations viz., Ca2+, Mg2', Mn2+, etc. It is a metalloprotein. The lectin retains its activity by dialysis with acetic acid followed by EDTA. It agglutinates Ehrlich ascites cells. Equilibrium dialysis of lectin with melibiose and quenching of fluorescence of 4-methylumbelliferyl-cy-~-galactopyranoside by the lectin show that homotetrameric jackfruit lectin has two sugar-binding sites. The lectin precipitates well several galactomannans and glycoproteins having terminal D-Gal-cy-(l + 6)-or D-Gal-@-(l + 3)-~-GalNAc residues. It hardly or does not precipitate polysaccharides having terminal D-Gal-a-( 1 + 3) residues. Quantitative precipitin-inhibition studies using various haptens suggest that the -OCH2group at C-1 and -OH groups at C-4 and partially at C-6 in the cy-glycoside of D-galactose configuration are important for lectinsugar interaction.

Research paper thumbnail of Further characterization and immunochemical studies on the carbohydrate specificity of jackfruit (Artocarpus integrifolia) lectin

Journal of Biological Chemistry, 1989

The lectin from jackfruit (Artocarpus integrifolia) seeds has been purified by Rivanol (6,9-diami... more The lectin from jackfruit (Artocarpus integrifolia) seeds has been purified by Rivanol (6,9-diamino-2ethoxyacridine lactate) treatment. The specific activity, molecular weights of parent lectin and its subunit, its glycoprotein nature, and hemagglutination-inhibition assays suggest that this preparation is identical to that obtained by affinity chromatography on melibiose-agarose adsorbent (Ahmed, H., and Chatterjee, B. P. (1986) in Lectins, Biology, Biochemistry, Clinical Biochemistry (B0g-Hansen, T. C., and van Driessche, E., eds) Vol. 5, pp. 125-133, Walter de Gruyter, New York). The lectin strongly agglutinates human and several animal erythrocytes. The lectin contains five isolectins of PI values 7.1, 6.85, 5.5, 5.3, and 5.1. It is thermally stable and loses its activity above 75 "C. The hemagglutinating activity remains unchanged in the presence of bivalent cations viz., Ca2+, Mg2', Mn2+, etc. It is a metalloprotein. The lectin retains its activity by dialysis with acetic acid followed by EDTA. It agglutinates Ehrlich ascites cells. Equilibrium dialysis of lectin with melibiose and quenching of fluorescence of 4-methylumbelliferyl-cy-~-galactopyranoside by the lectin show that homotetrameric jackfruit lectin has two sugar-binding sites. The lectin precipitates well several galactomannans and glycoproteins having terminal D-Gal-cy-(l + 6)-or D-Gal-@-(l + 3)-~-GalNAc residues. It hardly or does not precipitate polysaccharides having terminal D-Gal-a-( 1 + 3) residues. Quantitative precipitin-inhibition studies using various haptens suggest that the -OCH2group at C-1 and -OH groups at C-4 and partially at C-6 in the cy-glycoside of D-galactose configuration are important for lectinsugar interaction.