View source for 3exy


==Crystal structure of the 2[4Fe-4S] ferredoxin V13G variant from allochromatium vinosum==
<StructureSection load='3exy' size='340' side='right'caption='[[3exy]], [[Resolution|resolution]] 1.48&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3exy]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Allochromatium_vinosum Allochromatium vinosum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3EXY OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3EXY 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]] 1.48&#8491;</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=3exy FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3exy OCA], [https://pdbe.org/3exy PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3exy RCSB], [https://www.ebi.ac.uk/pdbsum/3exy PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3exy ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/FER_ALLVD FER_ALLVD] Ferredoxins are iron-sulfur proteins that transfer electrons in a wide variety of metabolic reactions.
== 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/ex/3exy_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=3exy ConSurf].
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== Publication Abstract from PubMed ==
The crystal structures of the C57A and V13G molecular variants of Allochromatium vinosum 2[4Fe-4S] ferredoxin (AlvinFd) and that of the homologous ferredoxin from Escherichia coli (EcFd) have been determined at 1.05-, 1.48-, and 1.65-A resolution, respectively. The present structures combined with cyclic voltammetry studies establish clear effects of the degree of exposure of the cluster with the lowest reduction potential (cluster I) towards less negative reduction potentials (E degrees ). This is better illustrated by V13G AlvinFd (high exposure, E degrees = -594 mV) and EcFd (low exposure, E degrees = -675 mV). In C57A AlvinFd, the movement of the protein backbone, as a result of replacing the noncoordinating Cys57 by Ala, leads to a +50-mV upshift of the potential of the nearby cluster I, by removal of polar interactions involving the thiolate group and adjustment of the hydrogen-bond network involving the cluster atoms. In addition, the present structures and other previously reported accurate structures of this family of ferredoxins indicate that polar interactions of side chains and water molecules with cluster II sulfur atoms, which are absent in the environment of cluster I, are correlated to the approximately 180-250 mV difference between the reduction potentials of clusters I and II. These findings provide insight into the significant effects of subtle structural differences of the protein and solvent environment around the clusters of [4Fe-4S] ferredoxins on their electrochemical properties.

Insight into the protein and solvent contributions to the reduction potentials of [4Fe-4S](2+/+) clusters: crystal structures of the Allochromatium vinosum ferredoxin variants C57A and V13G and the homologous Escherichia coli ferredoxin.,Saridakis E, Giastas P, Efthymiou G, Thoma V, Moulis JM, Kyritsis P, Mavridis IM J Biol Inorg Chem. 2009 Mar 17. PMID:19290553<ref>PMID:19290553</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Ferredoxin 3D structures|Ferredoxin 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Allochromatium vinosum]]
[[Category: Large Structures]]
[[Category: Giastas P]]
[[Category: Mavridis IM]]
[[Category: Saridakis E]]