8AJO

Negative-stain electron microscopy structure of DDB1-DCAF12-CCT5


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 30.6 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Recognition of the CCT5 di-Glu degron by CRL4 DCAF12 is dependent on TRiC assembly.

Pla-Prats, C.Cavadini, S.Kempf, G.Thoma, N.H.

(2023) EMBO J 42: e112253-e112253

  • DOI: https://doi.org/10.15252/embj.2022112253
  • Primary Citation of Related Structures:  
    8AJM, 8AJN, 8AJO

  • PubMed Abstract: 

    Assembly Quality Control (AQC) E3 ubiquitin ligases target incomplete or incorrectly assembled protein complexes for degradation. The CUL4-RBX1-DDB1-DCAF12 (CRL4 DCAF12 ) E3 ligase preferentially ubiquitinates proteins that carry a C-terminal double glutamate (di-Glu) motif. Reported CRL4 DCAF12 di-Glu-containing substrates include CCT5, a subunit of the TRiC chaperonin. How DCAF12 engages its substrates and the functional relationship between CRL4 DCAF12 and CCT5/TRiC is currently unknown. Here, we present the cryo-EM structure of the DDB1-DCAF12-CCT5 complex at 2.8 Å resolution. DCAF12 serves as a canonical WD40 DCAF substrate receptor and uses a positively charged pocket at the center of the β-propeller to bind the C-terminus of CCT5. DCAF12 specifically reads out the CCT5 di-Glu side chains, and contacts other visible degron amino acids through Van der Waals interactions. The CCT5 C-terminus is inaccessible in an assembled TRiC complex, and functional assays demonstrate that DCAF12 binds and ubiquitinates monomeric CCT5, but not CCT5 assembled into TRiC. Our biochemical and structural results suggest a previously unknown role for the CRL4 DCAF12 E3 ligase in overseeing the assembly of a key cellular complex.


  • Organizational Affiliation

    Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA damage-binding protein 11,164Homo sapiensMutation(s): 0 
Gene Names: DDB1XAP1
UniProt & NIH Common Fund Data Resources
Find proteins for Q16531 (Homo sapiens)
Explore Q16531 
Go to UniProtKB:  Q16531
PHAROS:  Q16531
GTEx:  ENSG00000167986 
Entity Groups  
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UniProt GroupQ16531
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
DDB1- and CUL4-associated factor 12477Homo sapiensMutation(s): 0 
Gene Names: DCAF12KIAA1892TCC52WDR40A
UniProt & NIH Common Fund Data Resources
Find proteins for Q5T6F0 (Homo sapiens)
Explore Q5T6F0 
Go to UniProtKB:  Q5T6F0
PHAROS:  Q5T6F0
GTEx:  ENSG00000198876 
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UniProt GroupQ5T6F0
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
T-complex protein 1 subunit epsilon565Homo sapiensMutation(s): 0 
Gene Names: CCT5CCTEKIAA0098
UniProt & NIH Common Fund Data Resources
Find proteins for P48643 (Homo sapiens)
Explore P48643 
Go to UniProtKB:  P48643
PHAROS:  P48643
GTEx:  ENSG00000150753 
Entity Groups  
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UniProt GroupP48643
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 30.6 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European Research Council (ERC)European Union--

Revision History  (Full details and data files)

  • Version 1.0: 2022-11-09
    Type: Initial release
  • Version 1.1: 2023-05-24
    Changes: Database references
  • Version 1.2: 2024-07-24
    Changes: Data collection