1kek

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[[Image:1kek.png|left|200px]]
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==Crystal Structure of the Free Radical Intermediate of Pyruvate:Ferredoxin Oxidoreductase==
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<StructureSection load='1kek' size='340' side='right' caption='[[1kek]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1kek]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Desulfovibrio_africanus Desulfovibrio africanus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1KEK OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1KEK FirstGlance]. <br>
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</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=CO2:CARBON+DIOXIDE'>CO2</scene>, <scene name='pdbligand=HTL:2-ACETYL-THIAMINE+DIPHOSPHATE'>HTL</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=SF4:IRON/SULFUR+CLUSTER'>SF4</scene><br>
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<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1b0p|1b0p]], [[2pda|2pda]]</td></tr>
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<tr><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Pyruvate_synthase Pyruvate synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.2.7.1 1.2.7.1] </span></td></tr>
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<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1kek FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1kek OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1kek RCSB], [http://www.ebi.ac.uk/pdbsum/1kek PDBsum]</span></td></tr>
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<table>
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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/ke/1kek_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/chain_selection.php?pdb_ID=2ata ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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In anaerobic organisms, the decarboxylation of pyruvate, a crucial component of intermediary metabolism, is catalyzed by the metalloenzyme pyruvate: ferredoxin oxidoreductase (PFOR) resulting in the generation of low potential electrons and the subsequent acetylation of coenzyme A (CoA). PFOR is the only enzyme for which a stable acetyl thiamine diphosphate (ThDP)-based free radical reaction intermediate has been identified. The 1.87 A-resolution structure of the radical form of PFOR from Desulfovibrio africanus shows that, despite currently accepted ideas, the thiazole ring of the ThDP cofactor is markedly bent, indicating a drastic reduction of its aromaticity. In addition, the bond connecting the acetyl group to ThDP is unusually long, probably of the one-electron type already described for several cation radicals but not yet found in a biological system. Taken together, our data, along with evidence from the literature, suggest that acetyl-CoA synthesis by PFOR proceeds via a condensation mechanism involving acetyl (PFOR-based) and thiyl (CoA-based) radicals.
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{{STRUCTURE_1kek| PDB=1kek | SCENE= }}
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Crystal structure of the free radical intermediate of pyruvate:ferredoxin oxidoreductase.,Chabriere E, Vernede X, Guigliarelli B, Charon MH, Hatchikian EC, Fontecilla-Camps JC Science. 2001 Dec 21;294(5551):2559-63. PMID:11752578<ref>PMID:11752578</ref>
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===Crystal Structure of the Free Radical Intermediate of Pyruvate:Ferredoxin Oxidoreductase===
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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{{ABSTRACT_PUBMED_11752578}}
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==About this Structure==
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[[1kek]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Desulfovibrio_africanus Desulfovibrio africanus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1KEK OCA].
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==See Also==
==See Also==
*[[Pyruvate-ferredoxin oxidoreductase|Pyruvate-ferredoxin oxidoreductase]]
*[[Pyruvate-ferredoxin oxidoreductase|Pyruvate-ferredoxin oxidoreductase]]
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== References ==
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==Reference==
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<references/>
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<ref group="xtra">PMID:011752578</ref><ref group="xtra">PMID:012651851</ref><references group="xtra"/>
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__TOC__
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</StructureSection>
[[Category: Desulfovibrio africanus]]
[[Category: Desulfovibrio africanus]]
[[Category: Pyruvate synthase]]
[[Category: Pyruvate synthase]]

Revision as of 09:04, 28 September 2014

Crystal Structure of the Free Radical Intermediate of Pyruvate:Ferredoxin Oxidoreductase

1kek, resolution 1.90Å

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