Experimental Data Snapshot

  • Resolution: 1.95 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.211 

wwPDB Validation   3D Report Full Report

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Intracellular antibody signalling is regulated by phosphorylation of the Fc receptor TRIM21.

Dickson, C.Fletcher, A.Vaysburd, M.Yang, J.C.Mallery, D.L.Zeng, J.Johnson, C.M.McLaughlin, S.H.Skehel, M.Maslen, S.Cruickshank, J.Huguenin-Dezot, N.Chin, J.W.Neuhaus, D.James, L.C.

(2018) Elife 7

  • DOI: https://doi.org/10.7554/eLife.32660
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Cell surface Fc receptors activate inflammation and are tightly controlled to prevent autoimmunity. Antibodies also simulate potent immune signalling from inside the cell via the cytosolic antibody receptor TRIM21, but how this is regulated is unknown. Here we show that TRIM21 signalling is constitutively repressed by its B-Box domain and activated by phosphorylation. The B-Box occupies an E2 binding site on the catalytic RING domain by mimicking E2-E3 interactions, inhibiting TRIM21 ubiquitination and preventing immune activation. TRIM21 is derepressed by IKKβ and TBK1 phosphorylation of an LxxIS motif in the RING domain, at the interface with the B-Box. Incorporation of phosphoserine or a phosphomimetic within this motif relieves B-Box inhibition, promoting E2 binding, RING catalysis, NF-κB activation and cytokine transcription upon infection with DNA or RNA viruses. These data explain how intracellular antibody signalling is regulated and reveal that the B-Box is a critical regulator of RING E3 ligase activity.

  • Organizational Affiliation

    Medical Research Council Laboratory of Molecular Biology, Cambridge, United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
E3 ubiquitin-protein ligase TRIM21
A, B
132Homo sapiensMutation(s): 0 
Gene Names: TRIM21RNF81RO52SSA1
UniProt & NIH Common Fund Data Resources
Find proteins for P19474 (Homo sapiens)
Explore P19474 
Go to UniProtKB:  P19474
PHAROS:  P19474
GTEx:  ENSG00000132109 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP19474
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.95 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.211 
  • Space Group: P 2 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 28.4α = 90
b = 83.26β = 90
c = 117.588γ = 90
Software Package:
Software NamePurpose
iMOSFLMdata reduction
Aimlessdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

  • Released Date: 2018-04-25 
  • Deposition Author(s): James, L.C.

Revision History  (Full details and data files)

  • Version 1.0: 2018-04-25
    Type: Initial release