1ye4
From Proteopedia
Crystal structure of the Lys-274 to Arg mutant of Candida tenuis xylose reductase (AKR2B5) bound to NAD+
Structural highlights
FunctionXYL1_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 PubMedAldo-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[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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