2pan

Crystal structure of E. coli glyoxylate carboligase

spinqualitylabelsall models 2pan, resolution 2.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2pan is a 6 chain structure with sequence from "bacillus_coli"_migula_1895 "bacillus coli" migula 1895. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: 1PE, DTT, FAD, MG, TDP NonStd Res: MSE Gene: gcl ("Bacillus coli" Migula 1895) Activity: Tartronate-semialdehyde synthase, with EC number 4.1.1.47 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [GCL_ECOLI] Catalyzes the condensation of two molecules of glyoxylate to give 2-hydroxy-3-oxopropanoate (also termed tartronate semialdehyde). 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 Thiamine diphosphate (ThDP), a derivative of vitamin B1, is an enzymatic cofactor whose special chemical properties allow it to play critical mechanistic roles in a number of essential metabolic enzymes. It has been assumed that all ThDP-dependent enzymes exploit a polar interaction between a strictly conserved glutamate and the N1' of the ThDP moiety. The crystal structure of glyoxylate carboligase challenges this paradigm by revealing that valine replaces the conserved glutamate. Through kinetic, spectroscopic and site-directed mutagenesis studies, we show that although this extreme change lowers the rate of the initial step of the enzymatic reaction, it ensures efficient progress through subsequent steps. Glyoxylate carboligase thus provides a unique illustration of the fine tuning between catalytic stages imposed during evolution on enzymes catalyzing multistep processes. Glyoxylate carboligase lacks the canonical active site glutamate of thiamine-dependent enzymes.,Kaplun A, Binshtein E, Vyazmensky M, Steinmetz A, Barak Z, Chipman DM, Tittmann K, Shaanan B Nat Chem Biol. 2008 Feb;4(2):113-8. Epub 2008 Jan 6. PMID:18176558 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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