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1wuq

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[[Image:1wuq.gif|left|200px]]
 
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{{Structure
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==Structure of GTP cyclohydrolase I Complexed with 8-oxo-GTP==
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|PDB= 1wuq |SIZE=350|CAPTION= <scene name='initialview01'>1wuq</scene>, resolution 2.0&Aring;
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<StructureSection load='1wuq' size='340' side='right'caption='[[1wuq]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
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|SITE=
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== Structural highlights ==
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|LIGAND= <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene> and <scene name='pdbligand=8GT:8-OXO-GUANOSINE-5&#39;-TRIPHOSPHATE'>8GT</scene>
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<table><tr><td colspan='2'>[[1wuq]] is a 5 chain structure with sequence from [https://en.wikipedia.org/wiki/Thermus_thermophilus Thermus thermophilus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1WUQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1WUQ FirstGlance]. <br>
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|ACTIVITY= [http://en.wikipedia.org/wiki/GTP_cyclohydrolase_I GTP cyclohydrolase I], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.5.4.16 3.5.4.16]
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2&#8491;</td></tr>
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|GENE=
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=8GT:8-OXO-GUANOSINE-5-TRIPHOSPHATE'>8GT</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
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}}
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1wuq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1wuq OCA], [https://pdbe.org/1wuq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1wuq RCSB], [https://www.ebi.ac.uk/pdbsum/1wuq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1wuq ProSAT], [https://www.topsan.org/Proteins/RSGI/1wuq TOPSAN]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/Q5SH52_THET8 Q5SH52_THET8]
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/wu/1wuq_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1wuq ConSurf].
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<div style="clear:both"></div>
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'''Structure of GTP cyclohydrolase I Complexed with 8-oxo-GTP'''
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==See Also==
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*[[Cyclohydrolase 3D structures|Cyclohydrolase 3D structures]]
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__TOC__
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==Overview==
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</StructureSection>
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GTP cyclohydrolase I (GTPCH1) catalyzes the conversion of GTP to dihydroneopterin 3'-triphosphate. We found that an 8-oxoguanine derivative of GTP (8-oxo-GTP) strongly bound to GTPCH1 from Thermus thermophilus HB8 (tGTPCH1) as a competitive inhibitor. The affinity of 8-oxo-GTP was three orders of magnitude greater than that of GTP. These results suggest that 8-oxo-GTP is a transition state analogue of GTPCH1. We have solved the X-ray crystal structures of tGTPCH1 complexed with 8-oxo-GTP and 8-oxo-dGTP at 2.0 and 1.8 A resolution, respectively, as well as the free form of the enzyme at 2.2 A resolution. In the structure of tGTPCH1 complexed with 8-oxo-GTP or 8-oxo-dGTP, the oxygen atoms at O8 of the 8-oxoguanine groups, together with residues Cys108, His111 and Cys179, are coordinated to the zinc ion. The water molecule between Ndelta1 of His177 and N7 of 8-oxoguanine is conserved in both structures. These structural data are in accordance with one of the proposed transition states. Superimpositioning of the structures indicates the imidazole ring of His110 is rotated, implying concomitant proton transfer to the ribose ring O4'. Based on these structural data we propose a novel reaction mechanism for GTPCH1.
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[[Category: Large Structures]]
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==About this Structure==
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1WUQ is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Thermus_thermophilus Thermus thermophilus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1WUQ OCA].
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==Reference==
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Novel reaction mechanism of GTP cyclohydrolase I. High-resolution X-ray crystallography of Thermus thermophilus HB8 enzyme complexed with a transition state analogue, the 8-oxoguanine derivative., Tanaka Y, Nakagawa N, Kuramitsu S, Yokoyama S, Masui R, J Biochem. 2005 Sep;138(3):263-75. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/16169877 16169877]
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[[Category: GTP cyclohydrolase I]]
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[[Category: Single protein]]
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[[Category: Thermus thermophilus]]
[[Category: Thermus thermophilus]]
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[[Category: Kuramitsu, S.]]
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[[Category: Kuramitsu S]]
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[[Category: Masui, R.]]
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[[Category: Masui R]]
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[[Category: Nakagawa, N.]]
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[[Category: Nakagawa N]]
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[[Category: RSGI, RIKEN Structural Genomics/Proteomics Initiative.]]
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[[Category: Tanaka Y]]
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[[Category: Tanaka, Y.]]
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[[Category: Yokoyama S]]
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[[Category: Yokoyama, S.]]
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[[Category: 8GT]]
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[[Category: ZN]]
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[[Category: beta barrel]]
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[[Category: hydrolase]]
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[[Category: national project on protein structural and functional analyse]]
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[[Category: nppsfa]]
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[[Category: protein-inhibitor complex]]
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[[Category: pteridine]]
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[[Category: riken structural genomics/proteomics initiative]]
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[[Category: rsgi]]
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[[Category: structural genomic]]
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[[Category: tetrahydrobiopterin]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 23 14:09:10 2008''
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Current revision

Structure of GTP cyclohydrolase I Complexed with 8-oxo-GTP

PDB ID 1wuq

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