View source for 3oeq


==Crystal structure of trimeric frataxin from the yeast Saccharomyces cerevisiae, with full length n-terminus==
<StructureSection load='3oeq' size='340' side='right'caption='[[3oeq]], [[Resolution|resolution]] 2.96&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3oeq]] 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=3OEQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3OEQ 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]] 2.96&#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=3oeq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3oeq OCA], [https://pdbe.org/3oeq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3oeq RCSB], [https://www.ebi.ac.uk/pdbsum/3oeq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3oeq ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/FRDA_YEAST FRDA_YEAST] Promotes the biosynthesis of heme as well as the assembly and repair of iron-sulfur clusters by delivering Fe(2+) to proteins involved in these pathways. Plays a role in the protection against iron-catalyzed oxidative stress through its ability to catalyze the oxidation of Fe(2+) to Fe(3+). Can store large amounts of the metal in the form of a ferrihydrite mineral by oligomerization. May be involved in regulation of the mitochondrial electron transport chain.<ref>PMID:9180083</ref> <ref>PMID:9988680</ref> <ref>PMID:15961414</ref> <ref>PMID:16371422</ref> <ref>PMID:19884169</ref> <ref>PMID:17027502</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Frataxin is a mitochondrial protein with a central role in iron homeostasis. Defects in frataxin function lead to Friedreich's ataxia, a progressive neurodegenerative disease with childhood onset. The function of frataxin has been shown to be closely associated with its ability to form oligomeric species; however, the factors controlling oligomerization and the types of oligomers present in solution are a matter of debate. Using small-angle X-ray scattering, we found that Co(2+), glycerol, and a single amino acid substitution at the N-terminus, Y73A, facilitate oligomerization of yeast frataxin, resulting in a dynamic equilibrium between monomers, dimers, trimers, hexamers, and higher-order oligomers. Using X-ray crystallography, we found that Co(2+) binds inside the channel at the 3-fold axis of the trimer, which suggests that the metal has an oligomer-stabilizing role. The results reveal the types of oligomers present in solution and support our earlier suggestions that the trimer is the main building block of yeast frataxin oligomers. They also indicate that different mechanisms may control oligomer stability and oligomerization in vivo.

Oligomerization Propensity and Flexibility of Yeast Frataxin Studied by X-ray Crystallography and Small-Angle X-ray Scattering.,Soderberg CA, Shkumatov AV, Rajan S, Gakh O, Svergun DI, Isaya G, Al-Karadaghi S J Mol Biol. 2011 Dec 16;414(5):783-97. Epub 2011 Oct 25. PMID:22051511<ref>PMID:22051511</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 3oeq" style="background-color:#fffaf0;"></div>

==See Also==
*[[Frataxin 3D Structures|Frataxin 3D Structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Saccharomyces cerevisiae]]
[[Category: Al-Karadaghi S]]
[[Category: Gakh O]]
[[Category: Isaya G]]
[[Category: Rajan S]]
[[Category: Soderberg CAG]]
[[Category: Ta C]]