1mp0

Binary Complex of Human Glutathione-Dependent Formaldehyde Dehydrogenase with NAD(H)

spinqualitylabelsall models 1mp0, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1mp0 is a 2 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: K, NAD, PO4, ZN Gene: ADH5 (Homo sapiens) Resources: FirstGlance, OCA, RCSB, PDBsum Function [ADHX_HUMAN] Class-III ADH is remarkably ineffective in oxidizing ethanol, but it readily catalyzes the oxidation of long-chain primary alcohols and the oxidation of S-(hydroxymethyl) glutathione. 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 Human Class III alcohol dehydrogenase (ADH), also known as glutathione-dependent formaldehyde dehydrogenase plays an important role in the formaldehyde detoxification and reduction of the nitric oxide metabolite s-nitrosoglutathione (GSNO). It follows a random bi bi kinetic mechanism and prefers bulkier substrates like long chain primary alcohols and glutathione adducts like s-hydroxymethylglutathione and GSNO over smaller alcohols like ethanol. The structure of the FDH.NAD(H) binary complex reported here, in conjunction with the other complexes of FDH, provide the structural basis of the kinetic observations. These structures show that the apoenzyme has a semi-open domain conformation that permits random random addition of alcohol or NAD(H). Moreover, there is no significant domain movement upon binding of the coenzyme or the substrate, 12-hydroxydodecanoic acid. Interestingly, two active site zinc coordination environments are observed in FDH. In the apoenzyme, the active site zinc is coordinated to Cys44, His66, Cys173 and a water molecule. In the FDH.NAD(H) binary complex reported here, Glu67 is added to the coordination environment of the active site zinc and the distance between the water molecule and zinc is increased. This change in the zinc coordination, brought about by the displacement of zinc of about 2 A towards Glu67 could promote substrate exchange at the active site metal during catalysis. Structure-function relationships in human Class III alcohol dehydrogenase (formaldehyde dehydrogenase).,Sanghani PC, Robinson H, Bennett-Lovsey R, Hurley TD, Bosron WF Chem Biol Interact. 2003 Feb 1;143-144:195-200. PMID:12604204 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Alcohol dehydrogenase

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