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5nt2

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Revision as of 12:11, 26 August 2020

Complex of influenza A NS1 with TRIM25 coiled coil domain

Structural highlights

5nt2 is a 8 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[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). [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.^[1] ^[2] ^[3]

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^[4]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Zou W, Zhang DE. The interferon-inducible ubiquitin-protein isopeptide ligase (E3) EFP also functions as an ISG15 E3 ligase. J Biol Chem. 2006 Feb 17;281(7):3989-94. Epub 2005 Dec 13. PMID:16352599 doi:http://dx.doi.org/10.1074/jbc.M510787200
↑ Nakasato N, Ikeda K, Urano T, Horie-Inoue K, Takeda S, Inoue S. A ubiquitin E3 ligase Efp is up-regulated by interferons and conjugated with ISG15. Biochem Biophys Res Commun. 2006 Dec 15;351(2):540-6. Epub 2006 Oct 18. PMID:17069755 doi:http://dx.doi.org/10.1016/j.bbrc.2006.10.061
↑ Gack MU, Shin YC, Joo CH, Urano T, Liang C, Sun L, Takeuchi O, Akira S, Chen Z, Inoue S, Jung JU. TRIM25 RING-finger E3 ubiquitin ligase is essential for RIG-I-mediated antiviral activity. Nature. 2007 Apr 19;446(7138):916-920. PMID:17392790 doi:http://dx.doi.org/10.1038/nature05732
↑ 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. Molecular mechanism of influenza A NS1-mediated TRIM25 recognition and inhibition. Nat Commun. 2018 May 8;9(1):1820. doi: 10.1038/s41467-018-04214-8. PMID:29739942 doi:http://dx.doi.org/10.1038/s41467-018-04214-8

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 See Also
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/5nt2"

Categories: Large Structures | Koliopoulos, M G | Rittinger, K | Ligase | Viral protein/host protein/e3 ligase/trim protein

@@ Line 1: / Line 1: @@
 ==Complex of influenza A NS1 with TRIM25 coiled coil domain==
-<StructureSection load='5nt2' size='340' side='right' caption='[[5nt2]], [[Resolution|resolution]] 4.26&Aring;' scene=''>
+<StructureSection load='5nt2' size='340' side='right'caption='[[5nt2]], [[Resolution|resolution]] 4.26&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[5nt2]] is a 8 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5NT2 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5NT2 FirstGlance]. <br>
+<table><tr><td colspan='2'>[[5nt2]] is a 8 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5NT2 OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=5NT2 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=5nt2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5nt2 OCA], [http://pdbe.org/5nt2 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5nt2 RCSB], [http://www.ebi.ac.uk/pdbsum/5nt2 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5nt2 ProSAT]</span></td></tr>
+</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=5nt2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5nt2 OCA], [http://pdbe.org/5nt2 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5nt2 RCSB], [http://www.ebi.ac.uk/pdbsum/5nt2 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5nt2 ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 17: / Line 17: @@
 </div>
 <div class="pdbe-citations 5nt2" style="background-color:#fffaf0;"></div>
+==See Also==
+*[[Ubiquitin protein ligase 3D structures|Ubiquitin protein ligase 3D structures]]
 == References ==
 <references/>
 __TOC__
 </StructureSection>
+[[Category: Large Structures]]
 [[Category: Koliopoulos, M G]]
 [[Category: Rittinger, K]]
 [[Category: Ligase]]
 [[Category: Viral protein/host protein/e3 ligase/trim protein]]

5nt2

From Proteopedia

Revision as of 12:11, 26 August 2020

Complex of influenza A NS1 with TRIM25 coiled coil domain

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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