View source for 5e44


==Crystal structure of holo-FNR of A. fischeri==
<StructureSection load='5e44' size='340' side='right'caption='[[5e44]], [[Resolution|resolution]] 2.65&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5e44]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Aliivibrio_fischeri Aliivibrio fischeri]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5E44 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5E44 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]] 2.65&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MPD:(4S)-2-METHYL-2,4-PENTANEDIOL'>MPD</scene>, <scene name='pdbligand=SF4:IRON/SULFUR+CLUSTER'>SF4</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=5e44 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5e44 OCA], [https://pdbe.org/5e44 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5e44 RCSB], [https://www.ebi.ac.uk/pdbsum/5e44 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5e44 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q70ET4_ALIFS Q70ET4_ALIFS] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The structure of the dimeric holo-fumarate and nitrate reduction regulator (FNR) from Aliivibrio fischeri has been solved at 2.65 A resolution. FNR globally controls the transition between anaerobic and aerobic respiration in facultative anaerobes through the assembly/degradation of its oxygen-sensitive [4Fe-4S] cluster. In the absence of O2, FNR forms a dimer and specifically binds to DNA, whereas in its presence, the cluster is degraded causing FNR monomerization and DNA dissociation. We have used our crystal structure and the information previously gathered from numerous FNR variants to propose that this process is governed by extremely fine-tuned interactions, mediated by two salt bridges near the amino-terminal cluster-binding domain and an "imperfect" coiled-coil dimer interface. [4Fe-4S] to [2Fe-2S] cluster degradation propagates a conformational signal that indirectly causes monomerization by disrupting the first of these interactions and unleashing the "unzipping" of the FNR dimer in the direction of the carboxyl-terminal DNA binding domain.

The crystal structure of the global anaerobic transcriptional regulator FNR explains its extremely fine-tuned monomer-dimer equilibrium.,Volbeda A, Darnault C, Renoux O, Nicolet Y, Fontecilla-Camps JC Sci Adv. 2015 Dec 4;1(11):e1501086. doi: 10.1126/sciadv.1501086. eCollection 2015, Dec. PMID:26665177<ref>PMID:26665177</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5e44" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Aliivibrio fischeri]]
[[Category: Large Structures]]
[[Category: Fontecilla-Camps JC]]
[[Category: Volbeda A]]