4LTB image
Deposition Date 2013-07-23
Release Date 2014-02-05
Last Version Date 2024-02-28
Entry Detail
PDB ID:
4LTB
Title:
Coiled-coil domain of TRIM25
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.59 Å
R-Value Free:
0.25
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Tripartite motif-containing 25 variant
Chain IDs:A, B
Chain Length:191
Number of Molecules:2
Biological Source:Homo sapiens
Primary Citation
The tripartite motif coiled-coil is an elongated antiparallel hairpin dimer.
Proc.Natl.Acad.Sci.USA 111 2494 2499 (2014)
PMID: 24550273 DOI: 10.1073/pnas.1318962111

Abstact

Tripartite motif (TRIM) proteins make up a large family of coiled-coil-containing RING E3 ligases that function in many cellular processes, particularly innate antiviral response pathways. Both dimerization and higher-order assembly are important elements of TRIM protein function, but the atomic details of TRIM tertiary and quaternary structure have not been fully understood. Here, we present crystallographic and biochemical analyses of the TRIM coiled-coil and show that TRIM proteins dimerize by forming interdigitating antiparallel helical hairpins that position the N-terminal catalytic RING domains at opposite ends of the dimer and the C-terminal substrate-binding domains at the center. The dimer core comprises an antiparallel coiled-coil with a distinctive, symmetric pattern of flanking heptad and central hendecad repeats that appear to be conserved across the entire TRIM family. Our studies reveal how the coiled-coil organizes TRIM25 to polyubiquitylate the RIG-I/viral RNA recognition complex and how dimers of the TRIM5α protein are arranged within hexagonal arrays that recognize the HIV-1 capsid lattice and restrict retroviral replication.

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