1irv
From Proteopedia
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| - | [[Image:1irv.gif|left|200px]] | + | [[Image:1irv.gif|left|200px]] |
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| - | '''CYTOCHROME C ISOZYME 1, REDUCED, MUTANT WITH ILE 75 REPLACED BY MET AND CYS 102 REPLACED BY THR''' | + | {{Structure |
| + | |PDB= 1irv |SIZE=350|CAPTION= <scene name='initialview01'>1irv</scene>, resolution 1.9Å | ||
| + | |SITE= | ||
| + | |LIGAND= <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene> and <scene name='pdbligand=HEM:PROTOPORPHYRIN IX CONTAINING FE'>HEM</scene> | ||
| + | |ACTIVITY= | ||
| + | |GENE= | ||
| + | }} | ||
| + | |||
| + | '''CYTOCHROME C ISOZYME 1, REDUCED, MUTANT WITH ILE 75 REPLACED BY MET AND CYS 102 REPLACED BY THR''' | ||
| + | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1IRV is a [ | + | 1IRV 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=1IRV OCA]. |
==Reference== | ==Reference== | ||
| - | 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:[http:// | + | 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:[http://www.ncbi.nlm.nih.gov/pubmed/8718869 8718869] |
[[Category: Saccharomyces cerevisiae]] | [[Category: Saccharomyces cerevisiae]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
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[[Category: mitochondrion]] | [[Category: mitochondrion]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 11:54:07 2008'' |
Revision as of 09:54, 20 March 2008
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| , resolution 1.9Å | |||||||
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| Ligands: | and | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
CYTOCHROME C ISOZYME 1, REDUCED, MUTANT WITH ILE 75 REPLACED BY MET AND CYS 102 REPLACED BY THR
Overview
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.
About this Structure
1IRV is a Single protein structure of sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA.
Reference
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
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