1h2j

ENDOGLUCANASE CEL5A IN COMPLEX WITH UNHYDROLYSED AND COVALENTLY LINKED 2,4-DINITROPHENYL-2-DEOXY-2-FLUORO-CELLOBIOSIDE AT 1.15 A RESOLUTION

spinqualitylabelsall models 1h2j, resolution 1.15Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1h2j is a 1 chain structure with sequence from Salipaludibacillus agaradhaerens. This structure supersedes the now removed PDB entry 1hf7. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.15Å Ligands: DCB, GOL, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function GUN5_SALAG 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 PubMed Non-covalent interactions between protein and ligand at the active centre of glycosidases play an enormous role in catalysis. Dissection of these hydrogen-bonding networks is not merely important for an understanding of enzymatic catalysis, but is also increasingly relevant for the design of transition-state mimics, whose tautomeric state, hydrogen-bonding interactions and protonation contribute to tight binding. Here, atomic resolution ( approximately 1 A) analysis of a series of complexes of the 34 kDa catalytic core domain of the Bacillus agaradhaerens endoglucanase Cel5A is presented. Cel5A is a 'retaining' endoglucanase which performs catalysis via the formation and subsequent breakdown of a covalent glycosyl-enzyme intermediate via oxocarbenium-ion-like transition states. Previous medium-resolution analyses of a series of enzymatic snapshots has revealed conformational changes in the substrate along the reaction coordinate (Davies et al., 1998). Here, atomic resolution analyses of the series of complexes along the pathway are presented, including the 'Michaelis' complex of the unhydrolysed substrate, the covalent glycosyl-enzyme intermediate and the complex with the reaction product, cellotriose. These structures reveal intimate details of the protein-ligand interactions, including most of the carbohydrate-associated H atoms and the tautomeric state of crucial active-centre groups in the pH 5 orthorhombic crystal form and serve to illustrate the potential for atomic resolution analyses to inform strategies for enzyme inhibition. Direct experimental observation of the hydrogen-bonding network of a glycosidase along its reaction coordinate revealed by atomic resolution analyses of endoglucanase Cel5A.,Varrot A, Davies GJ Acta Crystallogr D Biol Crystallogr. 2003 Mar;59(Pt 3):447-52. Epub 2003, Feb 21. PMID:12595701 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Glucanase 3D structures

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