1i3h
CONCANAVALIN A-DIMANNOSE STRUCTURECONCANAVALIN A-DIMANNOSE STRUCTURE
Structural highlights
Function[CONA_CANEN] D-mannose specific lectin. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe 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. 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[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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