View source for 2gx9


==X-ray structure of influenza virus NS1 effector domain==
<StructureSection load='2gx9' size='340' side='right'caption='[[2gx9]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2gx9]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Unidentified_influenza_virus Unidentified influenza virus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2GX9 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2GX9 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]] 2.1&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene>, <scene name='pdbligand=SCN:THIOCYANATE+ION'>SCN</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=2gx9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2gx9 OCA], [https://pdbe.org/2gx9 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2gx9 RCSB], [https://www.ebi.ac.uk/pdbsum/2gx9 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2gx9 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q6LD08_9INFA Q6LD08_9INFA] Inhibits post-transcriptional processing of cellular pre-mRNA, by binding and inhibiting two cellular proteins that are required for the 3'-end processing of cellular pre-mRNAs: the 30 kDa cleavage and polyadenylation specificity factor/CPSF4 and the poly(A)-binding protein 2/PABPN1. In turn, unprocessed 3' end pre-mRNAs accumulate in the host nucleus and are no longer exported to the cytoplasm. Cellular protein synthesis is thereby shut off very early after virus infection. Viral protein synthesis is not affected by the inhibition of the cellular 3' end processing machinery because the poly(A) tails of viral mRNAs are produced by the viral polymerase through a stuttering mechanism. Prevents the establishment of the cellular antiviral state by inhibiting TRIM25-mediated RIGI ubiquitination, which normally triggers the antiviral transduction signal that leads to the activation of type I IFN genes by transcription factors IRF3 and IRF7. Also binds poly(A) and U6 snRNA. Inhibits the integrated stress response (ISR) in the infected cell by blocking dsRNA binding by EIF2AK2/PKR and further phosphorylation of EIF2S1/EIF-2ALPHA. Stress granule formation is thus inhibited, which allows protein synthesis and viral replication.[RuleBase:RU362113]
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== Publication Abstract from PubMed ==
The nonstructural protein NS1 of influenza virus is an antagonist of host immune responses and is implicated in virulence. It has two domains, an N-terminal double-stranded RNA-binding domain (RBD) and an effector domain crucial for RBD function, for nuclear export and for sequestering messenger RNA-processing proteins. Here we present the crystallographic structure of the effector domain, which has a novel fold and suggests mechanisms for increased virulence in H5N1 strains.

X-ray structure of influenza virus NS1 effector domain.,Bornholdt ZA, Prasad BV Nat Struct Mol Biol. 2006 Jun;13(6):559-60. Epub 2006 May 21. PMID:16715094<ref>PMID:16715094</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 2gx9" style="background-color:#fffaf0;"></div>

==See Also==
*[[Nonstructural protein 3D structures|Nonstructural protein 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Unidentified influenza virus]]
[[Category: Bornholdt ZA]]
[[Category: Prasad BV]]