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1stq

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[[Image:1stq.jpg|left|200px]]<br /><applet load="1stq" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1stq, resolution 1.82&Aring;" />
 
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'''Cyrstal Structure of Cytochrome c Peroxidase Mutant: CcPK2M3'''<br />
 
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==Overview==
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==Cyrstal Structure of Cytochrome c Peroxidase Mutant: CcPK2M3==
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Previously a K(+)-binding site, analogous to that found in ascorbate peroxidase (APX), was engineered into cytochrome c peroxidase (CcP) to test the hypothesis that the bound K(+) influences the stability of the Trp191 cation radical formed during the CcP catalytic cycle (Bonagura et al., (1996) Biochemistry 35, 6107 and Bonagura et al., (1999) Biochemistry 38, 5528). Characterization of this mutant, designated CcPK2, showed that the stability of the Trp191 cation radical is dependent on the occupancy of the engineered K(+) site and that the Trp191 radical was much less stable in this mutant than in wild-type CcP. The mutations Met230Leu, Met231Gln, and Met172Ser have now been constructed on the CcPK2 mutant template to test if the Met residues also contribute to the stabilization of the Trp191 cation radical. Crystal structures show that the mutations affect only the local structure near the sites of mutation. Removal of these electronegative residues located less than 8 A from the Trp radical results in a further destabilization of the Trp radical. The characteristic EPR signal associated with the Trp radical is significantly narrowed and is characteristic of a tyrosine radical signal. Double-mixing stopped-flow experiments, where the delay time between the formation of CcP compound I and its mixing with horse heart ferrocytochrome c is varied, show that the stability of the Trp radical decreases as the Met residues are removed from the proximal cavity. When taken together, these results demonstrate a strong correlation between the experimentally determined stability of the Trp191 radical, the enzyme activity, and the calculated electrostatic stabilization of the Trp191 radical.
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<StructureSection load='1stq' size='340' side='right'caption='[[1stq]], [[Resolution|resolution]] 1.82&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1stq]] 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=1STQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1STQ 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]] 1.82&#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>, <scene name='pdbligand=K:POTASSIUM+ION'>K</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=1stq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1stq OCA], [https://pdbe.org/1stq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1stq RCSB], [https://www.ebi.ac.uk/pdbsum/1stq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1stq 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/st/1stq_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=1stq 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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1STQ 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 <scene name='pdbligand=K:'>K</scene> and <scene name='pdbligand=HEM:'>HEM</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. 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://oca.weizmann.ac.il/oca-bin/ocashort?id=1STQ 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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Electrostatic control of the tryptophan radical in cytochrome c peroxidase., Barrows TP, Bhaskar B, Poulos TL, Biochemistry. 2004 Jul 13;43(27):8826-34. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=15236591 15236591]
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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: Poulos TL]]
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[[Category: Poulos, T L.]]
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[[Category: HEM]]
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[[Category: K]]
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[[Category: ccp]]
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[[Category: cytochrome c peroxidase]]
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[[Category: haem peroxidase]]
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[[Category: heme peroxidase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 15:05:04 2008''
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Current revision

Cyrstal Structure of Cytochrome c Peroxidase Mutant: CcPK2M3

PDB ID 1stq

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