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==Complex of influenza A NS1 effector domain with TRIM25 coiled coil==
==Complex of influenza A NS1 effector domain with TRIM25 coiled coil==
<StructureSection load='5nt1' size='340' side='right' caption='[[5nt1]], [[Resolution|resolution]] 2.82&Aring;' scene=''>
<StructureSection load='5nt1' size='340' side='right'caption='[[5nt1]], [[Resolution|resolution]] 2.82&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[5nt1]] is a 6 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5NT1 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5NT1 FirstGlance]. <br>
<table><tr><td colspan='2'>[[5nt1]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [https://en.wikipedia.org/wiki/Influenza_A_virus_(A/Puerto_Rico/8/1934(H1N1)) Influenza A virus (A/Puerto Rico/8/1934(H1N1))]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5NT1 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5NT1 FirstGlance]. <br>
</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=5nt1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5nt1 OCA], [http://pdbe.org/5nt1 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5nt1 RCSB], [http://www.ebi.ac.uk/pdbsum/5nt1 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5nt1 ProSAT]</span></td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.82&#8491;</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=5nt1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5nt1 OCA], [https://pdbe.org/5nt1 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5nt1 RCSB], [https://www.ebi.ac.uk/pdbsum/5nt1 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5nt1 ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[http://www.uniprot.org/uniprot/TRI25_HUMAN TRI25_HUMAN]] Functions as a ubiquitin E3 ligase and as an ISG15 E3 ligase. Involved in innate immune defense against viruses by mediating ubiquitination of DDX58. Mediates 'Lys-63'-linked polyubiquitination of the DDX58 N-terminal CARD-like region which is crucial for triggering the cytosolic signal transduction that leads to the production of interferons in response to viral infection. Promotes ISGylation of 14-3-3 sigma (SFN), an adapter protein implicated in the regulation of a large spectrum signaling pathway. Mediates estrogen action in various target organs.<ref>PMID:16352599</ref> <ref>PMID:17069755</ref> <ref>PMID:17392790</ref> [[http://www.uniprot.org/uniprot/NS1_I34A1 NS1_I34A1]] 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). This results in the accumulation of unprocessed 3' end pre-mRNAs which can't be exported from the nucleus. 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 (By similarity). Prevents the establishment of the cellular antiviral state by inhibiting TRIM25-mediated DDX58 ubiquitination, which normally triggers the antiviral transduction signal that leads to the activation of type I IFN genes by transcription factors like IRF3 and IRF7. Prevents human EIF2AK2/PKR activation, either by binding double-strand RNA, or by interacting directly with EIF2AK2/PKR. This function may be important at the very beginning of the infection, when NS1 is mainly present in the cytoplasm. Also binds poly(A) and U6 snRNA. Suppresses the RNA silencing-based antiviral response in Drosophila cells (By similarity).
[https://www.uniprot.org/uniprot/TRI25_HUMAN TRI25_HUMAN] Functions as a ubiquitin E3 ligase and as an ISG15 E3 ligase. Involved in innate immune defense against viruses by mediating ubiquitination of DDX58. Mediates 'Lys-63'-linked polyubiquitination of the DDX58 N-terminal CARD-like region which is crucial for triggering the cytosolic signal transduction that leads to the production of interferons in response to viral infection. Promotes ISGylation of 14-3-3 sigma (SFN), an adapter protein implicated in the regulation of a large spectrum signaling pathway. Mediates estrogen action in various target organs.<ref>PMID:16352599</ref> <ref>PMID:17069755</ref> <ref>PMID:17392790</ref>  
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
RIG-I is a viral RNA sensor that induces the production of type I interferon (IFN) in response to infection with a variety of viruses. Modification of RIG-I with K63-linked poly-ubiquitin chains, synthesised by TRIM25, is crucial for activation of the RIG-I/MAVS signalling pathway. TRIM25 activity is targeted by influenza A virus non-structural protein 1 (NS1) to suppress IFN production and prevent an efficient host immune response. Here we present structures of the human TRIM25 coiled-coil-PRYSPRY module and of complexes between the TRIM25 coiled-coil domain and NS1. These structures show that binding of NS1 interferes with the correct positioning of the PRYSPRY domain of TRIM25 required for substrate ubiquitination and provide a mechanistic explanation for how NS1 suppresses RIG-I ubiquitination and hence downstream signalling. In contrast, the formation of unanchored K63-linked poly-ubiquitin chains is unchanged by NS1 binding, indicating that RING dimerisation of TRIM25 is not affected by NS1.
 
Molecular mechanism of influenza A NS1-mediated TRIM25 recognition and inhibition.,Koliopoulos MG, Lethier M, van der Veen AG, Haubrich K, Hennig J, Kowalinski E, Stevens RV, Martin SR, Reis E Sousa C, Cusack S, Rittinger K Nat Commun. 2018 May 8;9(1):1820. doi: 10.1038/s41467-018-04214-8. PMID:29739942<ref>PMID:29739942</ref>
 
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5nt1" style="background-color:#fffaf0;"></div>
 
==See Also==
*[[Ubiquitin protein ligase 3D structures|Ubiquitin protein ligase 3D structures]]
== References ==
== References ==
<references/>
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Koliopoulos, M G]]
[[Category: Homo sapiens]]
[[Category: Rittinger, K]]
[[Category: Large Structures]]
[[Category: Ligase]]
[[Category: Koliopoulos MG]]
[[Category: Viral protein/host protein]]
[[Category: Rittinger K]]

Latest revision as of 12:07, 22 November 2023

Complex of influenza A NS1 effector domain with TRIM25 coiled coil

5nt1, resolution 2.82Å

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