1fbx | pdb_00001fbx

CRYSTAL STRUCTURE OF ZINC-CONTAINING E.COLI GTP CYCLOHYDROLASE I

spinqualitylabelsall models 1fbx, resolution 2.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1fbx is a 15 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, ZN Related: 1gtp, 1a8r, 1fb1 Activity: GTP cyclohydrolase I, with EC number 3.5.4.16 Resources: FirstGlance, OCA, RCSB, PDBsum 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 The crystal structure of recombinant human GTP cyclohydrolase I was solved by Patterson search methods by using the coordinates of the Escherichia coli enzyme as a model. The human as well as bacterial enzyme were shown to contain an essential zinc ion coordinated to a His side chain and two thiol groups in each active site of the homodecameric enzymes that had escaped detection during earlier studies of the E. coli enzyme. The zinc ion is proposed to generate a hydroxyl nucleophile for attack of imidazole ring carbon atom eight of the substrate, GTP. It may also be involved in the hydrolytic release of formate from the intermediate, 2-amino-5-formylamino-6-ribosylamino-4(3H)-pyrimidinone 5'-triphosphate, and in the consecutive Amadori rearrangement of the ribosyl moiety. Zinc plays a key role in human and bacterial GTP cyclohydrolase I.,Auerbach G, Herrmann A, Bracher A, Bader G, Gutlich M, Fischer M, Neukamm M, Garrido-Franco M, Richardson J, Nar H, Huber R, Bacher A Proc Natl Acad Sci U S A. 2000 Dec 5;97(25):13567-72. PMID:11087827 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Cyclohydrolase

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