1ye4

Crystal structure of the Lys-274 to Arg mutant of Candida tenuis xylose reductase (AKR2B5) bound to NAD+

spinqualitylabelsall models 1ye4, resolution 2.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1ye4 is a 4 chain structure with sequence from Yamadazyma tenuis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.4Å Ligands: NAD, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function XYL1_CANTE Reduces D-xylose into xylitol. Has a preference for NADPH, but can also utilize NADH as cosubstrate. 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 Aldo-keto reductases of family 2 employ single site replacement Lys-->Arg to switch their cosubstrate preference from NADPH to NADH. X-ray crystal structures of Lys-274-->Arg mutant of Candida tenuis xylose reductase (AKR2B5) bound to NAD+ and NADP+ were determined at a resolution of 2.4 and 2.3A, respectively. Due to steric conflicts in the NADP+-bound form, the arginine side chain must rotate away from the position of the original lysine side chain, thereby disrupting a network of direct and water-mediated interactions between Glu-227, Lys-274 and the cofactor 2'-phosphate and 3'-hydroxy groups. Because anchoring contacts of its Glu-227 are lost, the coenzyme-enfolding loop that becomes ordered upon binding of NAD(P)+ in the wild-type remains partly disordered in the NADP+-bound mutant. The results delineate a catalytic reaction profile for the mutant in comparison to wild-type. Fine tuning of coenzyme specificity in family 2 aldo-keto reductases revealed by crystal structures of the Lys-274-->Arg mutant of Candida tenuis xylose reductase (AKR2B5) bound to NAD+ and NADP+.,Leitgeb S, Petschacher B, Wilson DK, Nidetzky B FEBS Lett. 2005 Jan 31;579(3):763-7. PMID:15670843 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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