1i3h
From Proteopedia
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CONCANAVALIN A-DIMANNOSE STRUCTURE
Overview
The complex between concanavalin A (Con A) and alpha1-2 mannobiose, (mannose alpha1-2 mannose) has been refined to 1.2 A resolution. This is, the highest resolution structure reported for any sugar-lectin complex. As, the native structure of Con A to 0.94 A resolution is already in the, database, this gives us a unique opportunity to examine sugar-protein, binding at high resolution. These data have allowed us to model a number, of hydrogen atoms involved in the binding of the sugar to Con A, using the, difference density map to place the hydrogen atoms. This map reveals the, presence of the protonated form of Asp208 involved in binding. Asp208 is, not protonated in the 0.94 A native structure. Our results clearly show, that this residue is protonated and hydrogen bonds to the sugar. The, structure accounts for the higher affinity of the alpha1-2 linked sugar, when compared to other disaccharides. This structure identifies different, interactions to those predicted by previous modelling studies. We believe, that the additional data presented here will enable significant, improvements to be made to the sugar-protein modelling algorithms.
About this Structure
1I3H is a Single protein structure of sequence from Canavalia ensiformis with MN and CA as ligands. Full crystallographic information is available from OCA.
Reference
The 1.2 A resolution structure of the Con A-dimannose complex., Sanders DA, Moothoo DN, Raftery J, Howard AJ, Helliwell JR, Naismith JH, J Mol Biol. 2001 Jul 20;310(4):875-84. PMID:11453694
Page seeded by OCA on Tue Nov 20 17:01:47 2007
