8j4u: Difference between revisions

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'''Unreleased structure'''


The entry 8j4u is ON HOLD  until Paper Publication
==Structure of HerA-Sir2 complex from Escherichia coli Nezha system==
<StructureSection load='8j4u' size='340' side='right'caption='[[8j4u]], [[Resolution|resolution]] 2.97&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8j4u]] is a 18 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8J4U OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8J4U FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 2.97&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=AGS:PHOSPHOTHIOPHOSPHORIC+ACID-ADENYLATE+ESTER'>AGS</scene>, <scene name='pdbligand=AR6:[(2R,3S,4R,5R)-5-(6-AMINOPURIN-9-YL)-3,4-DIHYDROXY-OXOLAN-2-YL]METHYL+[HYDROXY-[[(2R,3S,4R,5S)-3,4,5-TRIHYDROXYOXOLAN-2-YL]METHOXY]PHOSPHORYL]+HYDROGEN+PHOSPHATE'>AR6</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</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=8j4u FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8j4u OCA], [https://pdbe.org/8j4u PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8j4u RCSB], [https://www.ebi.ac.uk/pdbsum/8j4u PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8j4u ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0A7B5N0T7_ECOLX A0A7B5N0T7_ECOLX]
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
In response to the persistent exposure to phage infection, bacteria have evolved diverse antiviral defense mechanisms. In this study, we report a bacterial two-component defense system consisting of a Sir2 NADase and a HerA helicase. Cryo-electron microscopy reveals that Sir2 and HerA assemble into a approximately 1 MDa supramolecular octadecamer. Unexpectedly, this complex exhibits various enzymatic activities, including ATPase, NADase, helicase, and nuclease, which work together in a sophisticated manner to fulfill the antiphage function. Therefore, we name this defense system "Nezha" after a divine warrior in Chinese mythology who employs multiple weapons to defeat enemies. Our findings demonstrate that Nezha could sense phage infections, self-activate to arrest cell growth, eliminate phage genomes, and subsequently deactivate to allow for cell recovery. Collectively, Nezha represents a paradigm of sophisticated and multifaceted strategies bacteria use to defend against viral infections.


Authors:  
Multiple enzymatic activities of a Sir2-HerA system cooperate for anti-phage defense.,Tang D, Chen Y, Chen H, Jia T, Chen Q, Yu Y Mol Cell. 2023 Dec 21;83(24):4600-4613.e6. doi: 10.1016/j.molcel.2023.11.010. , Epub 2023 Dec 13. PMID:38096825<ref>PMID:38096825</ref>


Description:  
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
[[Category: Unreleased Structures]]
</div>
<div class="pdbe-citations 8j4u" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli]]
[[Category: Large Structures]]
[[Category: Chen Q]]
[[Category: Yu Y]]
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