View source for 7zqq


==Molybdenum storage protein - LB131H==
<StructureSection load='7zqq' size='340' side='right'caption='[[7zqq]], [[Resolution|resolution]] 1.75&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7zqq]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Azotobacter_vinelandii Azotobacter vinelandii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7ZQQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7ZQQ 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]] 1.75&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ATP:ADENOSINE-5-TRIPHOSPHATE'>ATP</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>, <scene name='pdbligand=UNL:UNKNOWN+LIGAND'>UNL</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=7zqq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7zqq OCA], [https://pdbe.org/7zqq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7zqq RCSB], [https://www.ebi.ac.uk/pdbsum/7zqq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7zqq ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/MOSA_AZOVD MOSA_AZOVD] Intracellular storage of molybdenum. Binds polyoxomolybdates. Can bind at least 90 molybdenum atoms per protein molecule.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Some N2-fixing bacteria store Mo to maintain the formation of the vital FeMo-cofactor dependent nitrogenase under Mo depleting conditions. The Mo storage protein (MoSto), developed for this purpose, has the unique capability to compactly deposit molybdate as polyoxometalate (POM) clusters in a (alphabeta)3 hexameric cage; the same occurs with the physicochemically related tungstate. To explore the structural diversity of W-based POM clusters, MoSto loaded under different conditions with tungstate and two site-specifically modified MoSto variants were structurally characterized by X-ray crystallography or single-particle cryo-EM. The MoSto cage contains five major locations for POM clusters occupied among others by heptanuclear, Keggin ion and even Dawson-like species also found in bulk solvent under defined conditions. We found both lacunary derivatives of these archetypical POM clusters with missing WOx units at positions exposed to bulk solvent and expanded derivatives with additional WOx units next to protecting polypeptide segments or other POM clusters. The cryo-EM map, unexpectedly, reveals a POM cluster in the cage center anchored to the wall by a WOx linker. Interestingly, distinct POM cluster structures can originate from identical, highly occupied core fragments of three to seven WOx units that partly correspond to those found in MoSto loaded with molybdate. These core fragments are firmly bound to the complementary protein template in contrast to the more variable, less occupied residual parts of the visible POM clusters. Due to their higher stability, W-based POM clusters are, on average, larger and more diverse than their Mo-based counterparts.

The molybdenum storage protein forms and deposits distinct polynuclear tungsten oxygen aggregates.,Aziz I, Kaltwasser S, Kayastha K, Khera R, Vonck J, Ermler U J Inorg Biochem. 2022 Sep;234:111904. doi: 10.1016/j.jinorgbio.2022.111904. Epub , 2022 Jun 16. PMID:35779405<ref>PMID:35779405</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7zqq" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Azotobacter vinelandii]]
[[Category: Large Structures]]
[[Category: Aziz I]]
[[Category: Ermler U]]