2ez8

Pyruvate oxidase variant F479W in complex with reaction intermediate 2-lactyl-thiamin diphosphate

spinqualitylabelsall models 2ez8, resolution 1.96Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2ez8 is a 2 chain structure with sequence from Lactiplantibacillus plantarum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.963Å Ligands: FAD, MG, NA, PYR, TDL Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function POXB_LACPL Important for the aerobic growth. Decarboxylates pyruvate in four steps. The energy released is partially stored in acetyl phosphate. 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 Enzymes that use the cofactor thiamin diphosphate (ThDP, 1), the biologically active form of vitamin B(1), are involved in numerous metabolic pathways in all organisms. Although a theory of the cofactor's underlying reaction mechanism has been established over the last five decades, the three-dimensional structures of most major reaction intermediates of ThDP enzymes have remained elusive. Here, we report the X-ray structures of key intermediates in the oxidative decarboxylation of pyruvate, a central reaction in carbon metabolism catalyzed by the ThDP- and flavin-dependent enzyme pyruvate oxidase (POX)3 from Lactobacillus plantarum. The structures of 2-lactyl-ThDP (LThDP, 2) and its stable phosphonate analog, of 2-hydroxyethyl-ThDP (HEThDP, 3) enamine and of 2-acetyl-ThDP (AcThDP, 4; all shown bound to the enzyme's active site) provide profound insights into the chemical mechanisms and the stereochemical course of thiamin catalysis. These snapshots also suggest a mechanism for a phosphate-linked acyl transfer coupled to electron transfer in a radical reaction of pyruvate oxidase. The catalytic cycle of a thiamin diphosphate enzyme examined by cryocrystallography.,Wille G, Meyer D, Steinmetz A, Hinze E, Golbik R, Tittmann K Nat Chem Biol. 2006 Jun;2(6):324-8. Epub 2006 May 7. PMID:16680160 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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