5EYA image
Deposition Date 2015-11-24
Release Date 2016-08-17
Last Version Date 2024-10-09
Entry Detail
PDB ID:
5EYA
Title:
TRIM25 RING domain in complex with Ubc13-Ub conjugate
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.40 Å
R-Value Free:
0.22
R-Value Work:
0.18
R-Value Observed:
0.19
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Ubiquitin-conjugating enzyme E2 N
Gene (Uniprot):UBE2N
Mutations:C87K
Chain IDs:A, D (auth: B)
Chain Length:152
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Polyubiquitin-B
Gene (Uniprot):UBB
Chain IDs:E (auth: C), F (auth: D)
Chain Length:76
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Tripartite motif-containing 25 variant
Chain IDs:B (auth: F), C (auth: G)
Chain Length:86
Number of Molecules:2
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Mechanism of TRIM25 Catalytic Activation in the Antiviral RIG-I Pathway.
Cell Rep 16 1315 1325 (2016)
PMID: 27425606 DOI: 10.1016/j.celrep.2016.06.070

Abstact

Antiviral response pathways induce interferon by higher-order assembly of signaling complexes called signalosomes. Assembly of the RIG-I signalosome is regulated by K63-linked polyubiquitin chains, which are synthesized by the E3 ubiquitin ligase, TRIM25. We have previously shown that the TRIM25 coiled-coil domain is a stable, antiparallel dimer that positions two catalytic RING domains on opposite ends of an elongated rod. We now show that the RING domain is a separate self-association motif that engages ubiquitin-conjugated E2 enzymes as a dimer. RING dimerization is required for catalysis, TRIM25-mediated RIG-I ubiquitination, interferon induction, and antiviral activity. We also provide evidence that RING dimerization and E3 ligase activity are promoted by binding of the TRIM25 SPRY domain to the RIG-I effector domain. These results indicate that TRIM25 actively participates in higher-order assembly of the RIG-I signalosome and helps to fine-tune the efficiency of the RIG-I-mediated antiviral response.

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Primary Citation of related structures