3o20: Difference between revisions

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'''Unreleased structure'''


The entry 3o20 is ON HOLD until Sep 30 2012
==Electron transfer complexes:experimental mapping of the Redox-dependent Cytochrome C electrostatic surface==
<StructureSection load='3o20' size='340' side='right'caption='[[3o20]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3o20]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Equus_caballus Equus caballus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3O20 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3O20 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]] 1.9&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACE:ACETYL+GROUP'>ACE</scene>, <scene name='pdbligand=HEC:HEME+C'>HEC</scene>, <scene name='pdbligand=NO3:NITRATE+ION'>NO3</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=3o20 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3o20 OCA], [https://pdbe.org/3o20 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3o20 RCSB], [https://www.ebi.ac.uk/pdbsum/3o20 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3o20 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CYC_HORSE CYC_HORSE] 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. Plays a role in apoptosis. Suppression of the anti-apoptotic members or activation of the pro-apoptotic members of the Bcl-2 family leads to altered mitochondrial membrane permeability resulting in release of cytochrome c into the cytosol. Binding of cytochrome c to Apaf-1 triggers the activation of caspase-9, which then accelerates apoptosis by activating other caspases (By similarity).
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== Publication Abstract from PubMed ==
The electrostatic surface of cytochrome c and its changes with the iron oxidation state are involved in the docking and undocking processes of this protein to its biological partners in the mitochondrial respiratory pathway. To investigate the subtle mechanisms of formation of productive macromolecular complexes and of their breakage following the electron transfer process, the X-ray structures of horse heart ferri-cytochrome c (trigonal form) and ferro-cytochrome c (monoclinic form) were obtained using nitrate ions both as a crystallizing agent and an anionic probe for mapping the electrostatic surface changes. Both crystal forms contain three protein molecules in the asymmetric unit. In addition, a total of 21.5 and 18 crystallographically independent nitrate ions were identified for the trigonal and monoclinic forms, respectively. By matching all the six crystallographically independent protein molecules, 26 different anion-protein interaction sites were identified on the surfaces of cytochrome c, 10 of which were found in both forms, 8 present only in the oxidized and 8 only in the reduced form. The structural analysis of the electron transfer complexes, based on this new information, suggests a specific exit strategy for cytochrome c after formation of productive protein-protein complexes: a directional sliding mechanism for the electron shuttle on the surface of the redox partner is proposed to take place after the electron transfer process has occurred.


Authors: De March, M., De Zorzi, R., Casini, A., Messori, L., Geremia, S., Demitri, N., Gabbiani, C., Guerri, A.
Nitrate as a probe of cytochrome c surface: crystallographic identification of crucial "hot spots" for protein-protein recognition.,De March M, Demitri N, De Zorzi R, Casini A, Gabbiani C, Guerri A, Messori L, Geremia S J Inorg Biochem. 2014 Jun;135:58-67. doi: 10.1016/j.jinorgbio.2014.02.015. Epub, 2014 Mar 11. PMID:24662464<ref>PMID:24662464</ref>


Description: Electron transfer complexes:experimental mapping of the Redox-dependent Cytochrome C electrostatic surface
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 3o20" style="background-color:#fffaf0;"></div>
 
==See Also==
*[[Cytochrome C 3D structures|Cytochrome C 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Equus caballus]]
[[Category: Large Structures]]
[[Category: Casini A]]
[[Category: De March M]]
[[Category: De Zorzi R]]
[[Category: Demitri N]]
[[Category: Gabbiani C]]
[[Category: Geremia S]]
[[Category: Guerri A]]
[[Category: Messori L]]

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