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1kok

From Proteopedia

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(New page: 200px<br /><applet load="1kok" size="450" color="white" frame="true" align="right" spinBox="true" caption="1kok, resolution 1.70&Aring;" /> '''Crystal Structure of...)
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[[Image:1kok.gif|left|200px]]<br /><applet load="1kok" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="1kok, resolution 1.70&Aring;" />
 
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'''Crystal Structure of Mesopone Cytochrome c Peroxidase (MpCcP)'''<br />
 
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==Overview==
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==Crystal Structure of Mesopone Cytochrome c Peroxidase (MpCcP)==
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The effect of heme ring oxygenation on enzyme structure and function has, been examined in a reconstituted cytochrome c peroxidase. Oxochlorin, derivatives were formed by OsO(4) treatment of mesoporphyrin followed by, acid-catalyzed pinacol rearrangement. The northern oxochlorin isomers were, isolated by chromatography, and the regio-isomers assignments determined, by 2D COSY and NOE 1H NMR. The major isomer, 4-mesoporphyrinone (Mp), was, metallated with FeCl(2) and reconstituted into cytochrome c peroxidase, (CcP) forming a hybrid green protein, MpCcP. The heme-altered enzyme has, 99% wild-type peroxidase activity with cytochrome c. EPR spectroscopy of, MpCcP intermediate compound I verifies the formation of the Trp(191), radical similar to wild-type CcP in the reaction cycle. Peroxidase, activity with small molecules is varied: guaiacol turnover increases, approximately five-fold while that with ferrocyanide is approximately 85%, of native. The electron-withdrawing oxo-substitutents on the cofactor, cause a approximately 60-mV increase in Fe(III)/Fe(II) reduction, potential. The present investigation represents the first structural, characterization of an oxochlorin protein with X-ray intensity data, collected to 1.70 A. Although a mixture of R- and S-mesopone isomers of, the FeMP cofactor was used during heme incorporation into the apo-protein, only the S-isomer is found in the crystallized protein.
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<StructureSection load='1kok' size='340' side='right'caption='[[1kok]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1kok]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1KOK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1KOK FirstGlance]. <br>
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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]] 1.7&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HIF:FE(III)-(4-MESOPORPHYRINONE)'>HIF</scene></td></tr>
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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=1kok FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1kok OCA], [https://pdbe.org/1kok PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1kok RCSB], [https://www.ebi.ac.uk/pdbsum/1kok PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1kok ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/CCPR_YEAST CCPR_YEAST] Destroys radicals which are normally produced within the cells and which are toxic to biological systems.
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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/ko/1kok_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=1kok ConSurf].
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<div style="clear:both"></div>
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==About this Structure==
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==See Also==
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1KOK is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae] with HIF as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Cytochrome-c_peroxidase Cytochrome-c peroxidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.11.1.5 1.11.1.5] Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1KOK OCA].
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*[[Cytochrome c peroxidase 3D structures|Cytochrome c peroxidase 3D structures]]
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__TOC__
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==Reference==
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</StructureSection>
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Mesopone cytochrome c peroxidase: functional model of heme oxygenated oxidases., Immoos CE, Bhaskar B, Cohen MS, Barrows TP, Farmer PJ, Poulos TL, J Inorg Biochem. 2002 Sep 20;91(4):635-43. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=12237229 12237229]
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[[Category: Large Structures]]
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[[Category: Cytochrome-c peroxidase]]
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[[Category: Saccharomyces cerevisiae]]
[[Category: Saccharomyces cerevisiae]]
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[[Category: Single protein]]
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[[Category: Barrows TP]]
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[[Category: Barrows, T.P.]]
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[[Category: Bhaskar B]]
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[[Category: Bhaskar, B.]]
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[[Category: Cohen MS]]
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[[Category: Cohen, M.S.]]
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[[Category: Farmer PJ]]
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[[Category: Farmer, P.J.]]
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[[Category: Immoos CE]]
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[[Category: Immoos, C.E.]]
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[[Category: Poulos TL]]
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[[Category: Poulos, T.L.]]
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[[Category: HIF]]
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[[Category: bifunctional catalyst]]
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[[Category: cytochrome c peroxidase]]
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[[Category: cytochrome oxidase]]
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[[Category: mesoporphyrin]]
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[[Category: nitrite reducatse]]
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[[Category: proximal loop]]
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[[Category: trp191 cationic radical]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Nov 20 19:30:33 2007''
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Current revision

Crystal Structure of Mesopone Cytochrome c Peroxidase (MpCcP)

PDB ID 1kok

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