1qf3 | pdb_00001qf3
PEANUT LECTIN COMPLEXED WITH METHYL-BETA-GALACTOSE
|
Overview
The crystal structures of complexes of peanut lectin with, methyl-beta-galactose and N-acetyllactosamine have been determined at 2.8, and 2.7 A, respectively. These, and the complexes involving lactose and, the T-antigenic disaccharide reported previously, permit a detailed, characterization of peanut-lectin-carbohydrate association and the role of, water molecules therein. The water molecules in the combining site are, substantially conserved in the four complexes. The role of interacting, sugar hydroxyl groups, when absent, are often mimicked by ordered water, molecules not only at the primary combining site, but also at the site of, the second sugar ring. The similarity of peanut-lectin-sugar interactions, with those in other galactose/N-acetylgalactosamine-specific lectins also, extend to a substantial degree to water bridges. The comparative study, provides a structural explanation for the exclusive specificity of peanut, lectin for galactose at the monosaccharide level, compared with that of, the other lectins for galactose as well as N-acetylgalactosamine. The, complexes also provide a qualitative structural rationale for differences, in the strengths of binding of peanut lectin to different sugars.
About this Structure
1QF3 is a Single protein structure of sequence from Arachis hypogaea with MBG, CA and MN as ligands. Full crystallographic information is available from OCA.
Reference
Structures of the complexes of peanut lectin with methyl-beta-galactose and N-acetyllactosamine and a comparative study of carbohydrate binding in Gal/GalNAc-specific legume lectins., Ravishankar R, Suguna K, Surolia A, Vijayan M, Acta Crystallogr D Biol Crystallogr. 1999 Aug;55(Pt 8):1375-82. PMID:10417405
Page seeded by OCA on Wed Nov 21 00:37:32 2007
