1cce

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[[Image:1cce.jpg|left|200px]]
 
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==CONSTRUCTION OF A BIS-AQUO HEME ENZYME AND REPLACEMENT WITH EXOGENOUS LIGAND==
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The line below this paragraph, containing "STRUCTURE_1cce", creates the "Structure Box" on the page.
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<StructureSection load='1cce' size='340' side='right'caption='[[1cce]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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== Structural highlights ==
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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<table><tr><td colspan='2'>[[1cce]] 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=1CCE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1CCE FirstGlance]. <br>
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or leave the SCENE parameter empty for the default display.
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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]] 2.3&#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=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene></td></tr>
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{{STRUCTURE_1cce| PDB=1cce | SCENE= }}
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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=1cce FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1cce OCA], [https://pdbe.org/1cce PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1cce RCSB], [https://www.ebi.ac.uk/pdbsum/1cce PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1cce 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/cc/1cce_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=1cce ConSurf].
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<div style="clear:both"></div>
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'''CONSTRUCTION OF A BIS-AQUO HEME ENZYME AND REPLACEMENT WITH EXOGENOUS LIGAND'''
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==See Also==
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*[[Cytochrome c peroxidase 3D structures|Cytochrome c peroxidase 3D structures]]
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__TOC__
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==Overview==
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</StructureSection>
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The crystal structure of the His-175--&gt;Gly (H175G) mutant of cytochrome-c peroxidase (EC 1.11.1.5), missing its only heme ligand, reveals that the histidine is replaced by solvent to give a bisaquo heme protein. This protein retains some residual activity, which can be stimulated or inhibited by addition of exogenous ligands. Structural analysis confirms the binding of imidazole to the heme at the position of the wild-type histidine ligand. This imidazole complex reacts readily with hydrogen peroxide to produce a radical species with novel properties. However, reactivation in this complex is incomplete (approximately 5%), which, in view of the very similar structures of the wild-type and the H175G/imidazole forms, implies a critical role for tethering of the axial ligand in catalysis. This study demonstrates the feasibility of constructing heme enzymes with no covalent link to the protein and with unnatural ligand replacements. Such enzymes may prove useful in studies of electron transfer mechanisms and in the engineering of novel heme-based catalysts.
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[[Category: Large Structures]]
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==About this Structure==
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1CCE is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CCE OCA].
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==Reference==
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Construction of a bisaquo heme enzyme and binding by exogenous ligands., McRee DE, Jensen GM, Fitzgerald MM, Siegel HA, Goodin DB, Proc Natl Acad Sci U S A. 1994 Dec 20;91(26):12847-51. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/7809133 7809133]
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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: Fitzgerald MM]]
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[[Category: Fitzgerald, M M.]]
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[[Category: Goodin DB]]
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[[Category: Goodin, D B.]]
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[[Category: Jensen GM]]
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[[Category: Jensen, G M.]]
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[[Category: Mcree DE]]
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[[Category: Mcree, D E.]]
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[[Category: Siegel HA]]
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[[Category: Siegel, H A.]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 12:34:42 2008''
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Current revision

CONSTRUCTION OF A BIS-AQUO HEME ENZYME AND REPLACEMENT WITH EXOGENOUS LIGAND

PDB ID 1cce

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