6FLN image
Deposition Date 2018-01-26
Release Date 2018-05-23
Last Version Date 2024-01-17
Entry Detail
PDB ID:
6FLN
Keywords:
Title:
Crystal structure of the human TRIM25 coiled-coil and PRYSPRY domains
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.60 Å
R-Value Free:
0.31
R-Value Work:
0.28
R-Value Observed:
0.28
Space Group:
P 61 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:E3 ubiquitin/ISG15 ligase TRIM25
Gene (Uniprot):TRIM25
Chain IDs:A, B, C (auth: E)
Chain Length:445
Number of Molecules:3
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Molecular mechanism of influenza A NS1-mediated TRIM25 recognition and inhibition.
Nat Commun 9 1820 1820 (2018)
PMID: 29739942 DOI: 10.1038/s41467-018-04214-8

Abstact

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.

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