5kjc

V222I horse liver alcohol dehydrogenase complexed with NAD+ and pentafluorobenzyl alcohol

spinqualitylabelsall models 5kjc, resolution 1.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5kjc is a 2 chain structure with sequence from Equus caballus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.2Å Ligands: MRD, NAJ, PFB, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function ADH1E_HORSE Publication Abstract from PubMed The dynamics of enzyme catalysis range from the slow time scale ( approximately ms) for substrate binding and conformational changes to the fast time ( approximately ps) scale for reorganization of substrates in the chemical step. The contribution of global dynamics to catalysis by alcohol dehydrogenase was tested by substituting five different, conserved amino acid residues that are distal from the active site and located in the hinge region for the conformational change or in hydrophobic clusters. X-ray crystallography shows that the structures for the G173A, V197I, I220(V, L or F), V222I, and F322L enzymes complexed with NAD(+) and an analogue of benzyl alcohol are almost identical, except for small perturbations at the sites of substitution. The enzymes have very similar kinetic constants for the oxidation of benzyl alcohol and reduction of benzaldehyde as compared to the wild-type enzyme, and the rates of conformational changes are not altered. Less conservative substitutions of these amino acid residues, such as G173(V, E, K, or R), V197(G, S, or T), I220(G, S, T, or N), and V222(G, S, or T) produced unstable or poorly-expressed proteins, indicating that the residues are critical for global stability. The enzyme scaffold accommodates conservative substitutions of distal residues, and there is no evidence that fast, global dynamics significantly affect the rate constants for hydride transfers. In contrast, other studies show that proximal residues significantly participate in catalysis. This article is protected by copyright. All rights reserved. Contribution of Buried Distal Amino Acid Residues in Horse Liver Alcohol Dehydrogenase to Structure and Catalysis.,Shanmuganatham KK, Wallace RS, Lee AT, Plapp BV Protein Sci. 2017 Dec 22. doi: 10.1002/pro.3370. PMID:29271062 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Alcohol dehydrogenase 3D structures

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