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1irw

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Revision as of 23:53, 10 September 2015

CYTOCHROME C ISOZYME 1, REDUCED, MUTANT WITH ASN 52 REPLACED BY ALA AND CYS 102 REPLACED BY THR

Structural highlights

1irw is a 1 chain structure with sequence from Atcc 18824. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	,
NonStd Res:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum

Function

[CYC1_YEAST] Electron carrier protein. The oxidized form of the cytochrome c heme group can accept an electron from the heme group of the cytochrome c1 subunit of cytochrome reductase. Cytochrome c then transfers this electron to the cytochrome oxidase complex, the final protein carrier in the mitochondrial electron-transport chain.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

The influence of mutations in two conserved regions of yeast iso-1-cytochrome c believed to be critical to the mechanism of cytochrome c electron transfer reactions has been investigated. The variants Asn52Ala, Tyr67Phe, Ile75Met, and Thr78Gly involve perturbation of critical hydrogen-bonding interactions with an internal water molecule (Wat166) and have been studied in terms of their electrochemical properties and the kinetics with which they are reduced by Fe(EDTA)2- and oxidized by Co(phen)3(3+). In parallel studies, the Co(phen)3(3+) oxidation kinetics of Tyr, Leu, Ile, Ala, Ser, and Gly variants of the phylogenetically conserved residue Phe82 have been studied and correlated with previous electrochemical and kinetic results. To assist mechanistic interpretation of these results, the three-dimensional structures of the Asn52Ala and Ile75Met ferrocytochrome c variants have been determined. The reduction potentials of the variants modified in the region of Wat166 were at least 33 mV (pH 6, 25 degrees C, and mu = 0.1 M) lower than that of the wild-type protein. Electron transfer reactivity of this family of variants in both the oxidation and reduction reactions was increased as much as 10-fold over that of the wild-type cytochrome. On the other hand, the reactivity of the position-82 variants in both oxidation and reduction depended on the structural characteristics of the oxidation-reduction reagent with which they reacted, and this reactivity was related to the nature of the residue at this position. These findings have been interpreted as demonstrating that the principal influence of modification at position-82 arises from changes in the nature of reactant-protein interaction at the surface of the protein and in maintaining the high reduction potential of the cytochrome while the principal influence of internal modifications near Wat166 results from alteration of the reorganization energy for the oxidation state-linked conformational change defined by crystallographic analysis of the wild-type protein.

Mechanistic and structural contributions of critical surface and internal residues to cytochrome c electron transfer reactivity.,Rafferty SP, Guillemette JG, Berghuis AM, Smith M, Brayer GD, Mauk AG Biochemistry. 1996 Aug 20;35(33):10784-92. PMID:8718869^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Rafferty SP, Guillemette JG, Berghuis AM, Smith M, Brayer GD, Mauk AG. Mechanistic and structural contributions of critical surface and internal residues to cytochrome c electron transfer reactivity. Biochemistry. 1996 Aug 20;35(33):10784-92. PMID:8718869 doi:10.1021/bi960430v

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 See Also
6 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1irw"

@@ Line 2: / Line 2: @@
 <StructureSection load='1irw' size='340' side='right' caption='[[1irw]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[1irw]] is a 1 chain structure with 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=1IRW OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1IRW FirstGlance]. <br>
+<table><tr><td colspan='2'>[[1irw]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_18824 Atcc 18824]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1IRW OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1IRW FirstGlance]. <br>
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
 <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=M3L:N-TRIMETHYLLYSINE'>M3L</scene></td></tr>
-<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1irw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1irw OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1irw RCSB], [http://www.ebi.ac.uk/pdbsum/1irw PDBsum]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1irw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1irw OCA], [http://pdbe.org/1irw PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1irw RCSB], [http://www.ebi.ac.uk/pdbsum/1irw PDBsum]</span></td></tr>
 </table>
 == Function ==
@@ Line 27: / Line 27: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 1irw" style="background-color:#fffaf0;"></div>
 ==See Also==
@@ Line 34: / Line 35: @@
 __TOC__
 </StructureSection>
-[[Category: Saccharomyces cerevisiae]]
+[[Category: Atcc 18824]]
 [[Category: Berghuis, A M]]
 [[Category: Brayer, G D]]

1irw

From Proteopedia

Revision as of 23:53, 10 September 2015

CYTOCHROME C ISOZYME 1, REDUCED, MUTANT WITH ASN 52 REPLACED BY ALA AND CYS 102 REPLACED BY THR

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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