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• W2407151060 abstract "1. A beta-galactosyl-binding lectin was purified from the haemolymph of the clam Tridacna maxima by affinity chromatography using polylecyl larch galactan, D-galactosamine coupled to epoxy-activated Sepharose or acid-treated Sepharose. Elution with N-acetyl-D-galactosamine or lactose displaced the bound lectin, which appeared homogeneous by sedimentation analysis. On immunoelectrophoresis at pH8.6 and against rabbit antisera to crude T. maxima haemolymph, the lectin gave one precipitin arc in the alpha-region. 2. On a alkaline polyacrylamide disc gels, one lightly stained band and a broad diffuse band were seen close to the cathode. Ioselectric focusing in solution revealed two peaks of pI4.05 and 4.25 and a shoulder, pI4.0, whereas at least three bands close together (pI3.9-4.3) were seen after electrofusing in gel. 3. The agglutinin is a glycoprotein with a mol.wt. of 470300 +/- 20000. Amino acid analysis revealed no methionine and a significant amount of half-cystine residues. 4. Tridacna lectin is a metalloprotein requiring Ca2+ for its haemagglutinating and precipitating activities. 5. In haemagglutination studies the agglutinin exhibited a broad pH optimum (4.8-10.6). 6. Polysaccharides and glycoproteins with terminal non-reducing beta-D-galactosyl residues reacted with the lectin to form precipitates both in gel and in solution. Inhibition experiments showed that N-acetyl-D-galactosamine was the best inhibitor of the agglutinin combining sites, followed by p-nitrophenyl beta-D-galactoside, methyl beta-D-galactoside, D-galactosamine and 60O-beta-D-galactopyranosyl-D-galactopyranose. On a molar basis, N-acetyl-D-galactosamine was 20-fold more active than D-galactose and nearly 10-fold more inhibitory than D-galactosamine. 7. Circular-dichroism studies showed that the lectin contains a relatively high proportion of beta-structure. 8. Mercaptoethanol treatment of the agglutinin followed by sodium dodecyl sulphate/polyacrylamide-gel electrophoresis revealed subunits with approx. mol.wts. of 10000, 20000 and 40000." @default.
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• W2407151060 date "1978-11-01" @default.
• W2407151060 modified "2023-09-23" @default.
• W2407151060 title "Purification and characterization of a galactan-reactive agglutinin from the clam Tridacna maxima (Röding) and a study of its combining site" @default.
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• W2407151060 doi "https://doi.org/10.1042/bj1750467" @default.
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