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.
(1999) Acta Crystallogr.,Sect.D 55: 1375-1382
- PubMed: 10417405
- Primary Citation of Related Structures:  1QF3
- PubMed Abstract:
- Conformation, Protein-Carbohydrate Interactions and a Novel Subunit Association in the Refined Structure of Peanut Lectin-Lactose Complex
Banerjee, R.,Das, K.,Ravishankar, R.,Suguna, K.,Surolia, A.,Vijayan, M.
(1996) J.Mol.Biol. 259: 281
- The Specificity of Peanut Agglutinin for Thomsen-Friedenreich Antigen is Mediated by Water-Bridges
Ravishankar, R.,Ravindran, M.,Suguna, K.,Surolia, A.,Vijayan, M.
(1997) Curr.Sci. 72: 855
- Crystal Structure of Peanut Lectin, a Protein with an Unusual Quaternary Structure
Banerjee, R.,Mande, S.C.,Ganesh, V.,Das, K.,Dhanaraj, V.,Mahanta, S.K.,Suguna, K.,Surolia, A.,Vijayan, M.
(1994) Proc.Natl.Acad.Sci.USA 91: 227
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 previous ...
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.
Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560 012, India.