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'''Unreleased structure'''
==CO-bound form of Selenium incorporated nitrogenase MoFe-protein (Av1-Se-CO) from A. vinelandii==
<StructureSection load='5bvh' size='340' side='right' caption='[[5bvh]], [[Resolution|resolution]] 1.53&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5bvh]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Azotobacter_vinelandii Azotobacter vinelandii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5BVH OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5BVH FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=CLF:FE(8)-S(7)+CLUSTER'>CLF</scene>, <scene name='pdbligand=CMO:CARBON+MONOXIDE'>CMO</scene>, <scene name='pdbligand=FE2:FE+(II)+ION'>FE2</scene>, <scene name='pdbligand=HCA:3-HYDROXY-3-CARBOXY-ADIPIC+ACID'>HCA</scene>, <scene name='pdbligand=ICH:IRON-SULFUR-MOLYBDENUM+CLUSTER+WITH+INTERSTITIAL+CARBON+WITH+SELENIUM+INCORPORATED'>ICH</scene>, <scene name='pdbligand=ICS:IRON-SULFUR-MOLYBDENUM+CLUSTER+WITH+INTERSTITIAL+CARBON'>ICS</scene>, <scene name='pdbligand=IMD:IMIDAZOLE'>IMD</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[5bvg|5bvg]]</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Nitrogenase Nitrogenase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.18.6.1 1.18.6.1] </span></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5bvh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5bvh OCA], [http://pdbe.org/5bvh PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5bvh RCSB], [http://www.ebi.ac.uk/pdbsum/5bvh PDBsum]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/NIFD_AZOVI NIFD_AZOVI]] This molybdenum-iron protein is part of the nitrogenase complex that catalyzes the key enzymatic reactions in nitrogen fixation. [[http://www.uniprot.org/uniprot/NIFK_AZOVI NIFK_AZOVI]] This molybdenum-iron protein is part of the nitrogenase complex that catalyzes the key enzymatic reactions in nitrogen fixation.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Dinitrogen reduction in the biological nitrogen cycle is catalyzed by nitrogenase, a two-component metalloenzyme. Understanding of the transformation of the inert resting state of the active site FeMo-cofactor into an activated state capable of reducing dinitrogen remains elusive. Here we report the catalysis dependent, site-selective incorporation of selenium into the FeMo-cofactor from selenocyanate as a newly identified substrate and inhibitor. The 1.60 A resolution structure reveals selenium occupying the S2B site of FeMo-cofactor in the Azotobacter vinelandii MoFe-protein, a position that was recently identified as the CO-binding site. The Se2B-labeled enzyme retains substrate reduction activity and marks the starting point for a crystallographic pulse-chase experiment of the active site during turnover. Through a series of crystal structures obtained at resolutions of 1.32-1.66 A, including the CO-inhibited form of Av1-Se2B, the exchangeability of all three belt-sulfur sites is demonstrated, providing direct insights into unforeseen rearrangements of the metal center during catalysis.


The entry 5bvh is ON HOLD
Catalysis-dependent selenium incorporation and migration in the nitrogenase active site iron-molybdenum cofactor.,Spatzal T, Perez KA, Howard JB, Rees DC Elife. 2015 Dec 16;4. pii: e11620. doi: 10.7554/eLife.11620. PMID:26673079<ref>PMID:26673079</ref>


Authors: Spatzal, T., Perez, K.A., Howard, J.B., Rees, D.C.
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 
</div>
Description:  
<div class="pdbe-citations 5bvh" style="background-color:#fffaf0;"></div>
[[Category: Unreleased Structures]]
== References ==
[[Category: Perez, K.A]]
<references/>
[[Category: Howard, J.B]]
__TOC__
[[Category: Rees, D.C]]
</StructureSection>
[[Category: Azotobacter vinelandii]]
[[Category: Nitrogenase]]
[[Category: Howard, J B]]
[[Category: Perez, K A]]
[[Category: Rees, D C]]
[[Category: Spatzal, T]]
[[Category: Spatzal, T]]
[[Category: Femo-cofactor]]
[[Category: Oxidoreductase]]
[[Category: Se-incorporation]]
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