4P4H image
Deposition Date 2014-03-12
Release Date 2014-07-30
Last Version Date 2023-12-27
Entry Detail
PDB ID:
4P4H
Keywords:
SIGNALING PROTEIN
Title:
Caught-in-action signaling complex of RIG-I 2CARD domain and MAVS CARD domain
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Escherichia coli
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
3.40 Å
R-Value Free:
0.23
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 21 21 21
4P4H validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Probable ATP-dependent RNA helicase DDX58
Gene (Uniprot):RIGI
Mutations:E52A
Chain IDs:A, B, C, D, E, F, G, H
Chain Length:205
Number of Molecules:8
Biological Source:Homo sapiens
UniProt ID:O95786 Pfam ID:PF16739 EC:3.6.4.13
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Mitochondrial antiviral-signaling protein
Gene (Uniprot):MAVS
Mutations:D23K, E26K, E80K
Chain IDs:I, J, K, L, M (auth: N), N (auth: O), O (auth: P), U (auth: M)
Chain Length:108
Number of Molecules:8
Biological Source:Homo sapiens
UniProt ID:Q7Z434 Pfam ID:PF16739
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Ubiquitin-60S ribosomal protein L40
Gene (Uniprot):UBA52
Chain IDs:P (auth: S), Q (auth: T), R (auth: U), S (auth: W), T (auth: X)
Chain Length:79
Number of Molecules:5
Biological Source:Homo sapiens
UniProt ID:P62987 Pfam ID:PF00240
Ligand Molecules
NA
Primary Citation
Molecular Imprinting as a Signal-Activation Mechanism of the Viral RNA Sensor RIG-I.
Mol.Cell 55 511 523 (2014)
PMID: 25018021 DOI: 10.1016/j.molcel.2014.06.010

Abstact

RIG-I activates interferon signaling pathways by promoting filament formation of the adaptor molecule, MAVS. Assembly of the MAVS filament is mediated by its CARD domain (CARD(MAVS)), and requires its interaction with the tandem CARDs of RIG-I (2CARD(RIG-I)). However, the precise nature of the interaction between 2CARD(RIG-I) and CARD(MAVS), and how this interaction leads to CARD(MAVS) filament assembly, has been unclear. Here we report a 3.6 Å electron microscopy structure of the CARD(MAVS) filament and a 3.4 Å crystal structure of the 2CARD(RIG-I):CARD(MAVS) complex, representing 2CARD(RIG-I) "caught in the act" of nucleating the CARD(MAVS) filament. These structures, together with functional analyses, show that 2CARD(RIG-I) acts as a template for the CARD(MAVS) filament assembly, by forming a helical tetrameric structure and recruiting CARD(MAVS) along its helical trajectory. Our work thus reveals that signal activation by RIG-I occurs by imprinting its helical assembly architecture on MAVS, a previously uncharacterized mechanism of signal transmission.

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Primary Citation of related structures
4P4H