Psophocarpus tetragonolobus Lectin (PTL/PTA I+II) - Pure

Product Description

Product Description
Psophocarpus tetragonolobus(psophocarpinB₁, a storage protein with chymotrypsin inhibitory activity), PTL I lectin is isolated from winged bean seeds and purified by affinity chromatography. The seed contains two lectins in which PTL I is thebasicof the two, with an isoelectric point greater than pH 9.5 and a molecular weight of 58,000. PTL I is a dimeric glycoprotein with specificity to GalNAc, eluting the sugar GalNAc.

This lectin agglutinates trypsinized rabbit and human type A and B erythrocytes but not trypsinized human type O erythrocytes. PTL I recognizes blood group A-substance derived oligosaccharides such as trisaccharide GalNAcï±1-3Galï_1-4Glc. Studies on inhibition assays of lectin-blood group A precipitation demonstrated that substance-derived oligosaccharides were the best inhibitors and had the common structure of D-GalNAc alpha(1,3)D-Gal-(beta 1,3/4) to a D-Glc, and about 8 and 4 times more active than D-GalNAc and D-GalNAc alpha(1,3)D-Gal, respectively.

Reports on the thermodynamics and kinetics of the lectin suggest that it has an extended binding site, and its interactions with saccharides involvereorientationof water molecules.

This product comes in a lyophilized powder form and is stored at -20ë�C.

Applications:
Glycobiology
Staining of mouse M-cells
Blood vessel staining of A and B group individuals

References

• Kortt, A. Purification and properties of the basic lectins from winged bean seed [Psophocarpus tetragonolobus(L.) DC].FEBS J. (1984) 138(3):519-525.
• Matsuda, T., et al. Carbohydrate binding specificity of the basic lectin from winged bean (Psophocarpus tetragonolobus).Mol Immunol.(1989) 26(2):189-95.
• Patanjali, S., et al. Erythrocyte-binding studies on an acidic lectin from winged bean (Psophocarpus tetragonolobus).Jbiochem. (1988) 252:625-631.
• Sharma, V., et al. Cloning and sequencing of the winged bean (Psophocarpus tetragonolobus)basic agglutinin (WBA I):presenceof second glycosylation site and its implications in quaternary structure.FEBS J.(1996) 389:289-292.