5exd | pdb_00005exd

Crystal structure of oxalate oxidoreductase from Moorella thermoacetica bound with carboxy-di-oxido-methyl-TPP (COOM-TPP) intermediate

spinqualitylabelsall models 5exd, resolution 2.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5exd is a 12 chain structure with sequence from Moorella thermoacetica ATCC 39073. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.5Å Ligands: MG, O2T, SF4, TPP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function OORA_MOOTA Catalyzes the anaerobic oxidation of oxalate using a broad range of electron acceptors, including ferredoxin and the nickel-dependent carbon monoxide dehydrogenase. Does not require coenzyme A as cosubstrate. Enables anaerobic growth on oxalate which is used as energy source by the bacteria. Publication Abstract from PubMed Thiamine pyrophosphate (TPP)-dependent oxalate oxidoreductase (OOR) metabolizes oxalate, generating two molecules of CO2 and two low-potential electrons, thus providing both the carbon and reducing equivalents for operation of the Wood-Ljungdahl pathway of acetogenesis. Here we present structures of OOR in which two different reaction intermediate bound states have been trapped: the covalent adducts between TPP and oxalate and between TPP and CO2. These structures, along with the previously determined structure of substrate-free OOR, allow us to visualize how active site rearrangements can drive catalysis. Our results suggest that OOR operates via a bait-and-switch mechanism, attracting substrate into the active site through the presence of positively charged and polar residues, and then altering the electrostatic environment through loop and side chain movements to drive catalysis. This simple but elegant mechanism explains how oxalate, a molecule that humans and most animals cannot break down, can be used for growth by acetogenic bacteria. One-carbon chemistry of oxalate oxidoreductase captured by X-ray crystallography.,Gibson MI, Chen PY, Johnson AC, Pierce E, Can M, Ragsdale SW, Drennan CL Proc Natl Acad Sci U S A. 2015 Dec 28. pii: 201518537. PMID:26712008 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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