View source for 1ytc


==THERMODYNAMIC CYCLES AS PROBES OF STRUCTURE-FUNCTION RELATIONSHIPS IN UNFOLDED PROTEINS==
<StructureSection load='1ytc' size='340' side='right'caption='[[1ytc]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1ytc]] 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=1YTC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1YTC FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.8&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HEC:HEME+C'>HEC</scene>, <scene name='pdbligand=M3L:N-TRIMETHYLLYSINE'>M3L</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1ytc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ytc OCA], [https://pdbe.org/1ytc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ytc RCSB], [https://www.ebi.ac.uk/pdbsum/1ytc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ytc ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CYC7_YEAST CYC7_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 ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/yt/1ytc_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</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=1ytc ConSurf].
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== Publication Abstract from PubMed ==
The relationship between structure and stability has been investigated for the folded forms and the unfolded forms of iso-2 cytochrome c and a variant protein with a stability-enhancing mutation, N52I iso-2. Differential scanning calorimetry has been used to measure the reversible unfolding transitions for the proteins in both heme oxidation states. Reduction potentials have been measured as a function of temperature for the folded forms of the proteins. The combination of measurements of thermal stability and reduction potential gives three sides of a thermodynamic cycle and allows prediction of the reduction potential of the thermally unfolded state. The free energies of electron binding for the thermally unfolded proteins differ from those expected for a fully unfolded protein, suggesting that residual structure modulates the reduction potential. At temperatures near 50 degrees C the N52I mutation has a small but significant effect on oxidation state-sensitive structure in the thermally unfolded protein. Inspection of the high-resolution X-ray crystallographic structures of iso-2 and N52I iso-2 shows that the effects of the N52I mutation and oxidation state on native protein stability are correlated with changes in the mobility of specific polypeptide chain segments and with altered hydrogen bonding involving a conserved water molecule. However, there is no clear explanation of oxidation state or mutation-induced differences in stability of the proteins in terms of observed changes in structure and mobility of the folded forms of the proteins alone.

Thermodynamic cycles as probes of structure in unfolded proteins.,McGee WA, Rosell FI, Liggins JR, Rodriguez-Ghidarpour S, Luo Y, Chen J, Brayer GD, Mauk AG, Nall BT Biochemistry. 1996 Feb 13;35(6):1995-2007. PMID:8639684<ref>PMID:8639684</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 1ytc" style="background-color:#fffaf0;"></div>

==See Also==
*[[Cytochrome C 3D structures|Cytochrome C 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Saccharomyces cerevisiae]]
[[Category: Brayer GD]]
[[Category: Luo Y]]