4AUQ

Structure of BIRC7-UbcH5b-Ub complex.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.18 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.204 

Starting Models: experimental
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This is version 1.3 of the entry. See complete history


Literature

Birc7-E2 Ubiquitin Conjugate Structure Reveals the Mechanism of Ubiquitin Transfer by a Ring Dimer.

Dou, H.Buetow, L.Sibbet, G.J.Cameron, K.Huang, D.T.

(2012) Nat Struct Mol Biol 19: 876

  • DOI: https://doi.org/10.1038/nsmb.2379
  • Primary Citation of Related Structures:  
    4AUQ

  • PubMed Abstract: 

    Certain RING ubiquitin ligases (E3s) dimerize to facilitate ubiquitin (Ub) transfer from ubiquitin-conjugating enzyme (E2) to substrate, but structural evidence on how this process promotes Ub transfer is lacking. Here we report the structure of the human dimeric RING domain from BIRC7 in complex with the E2 UbcH5B covalently linked to Ub (UbcH5B∼Ub). The structure reveals extensive noncovalent donor Ub interactions with UbcH5B and both subunits of the RING domain dimer that stabilize the globular body and C-terminal tail of Ub. Mutations that disrupt these noncovalent interactions or RING dimerization reduce UbcH5B∼Ub binding affinity and ubiquitination activity. Moreover, NMR analyses demonstrate that BIRC7 binding to UbcH5B∼Ub induces peak-shift perturbations in the donor Ub consistent with the crystallographically-observed Ub interactions. Our results provide structural insights into how dimeric RING E3s recruit E2∼Ub and optimize the donor Ub configuration for transfer.


  • Organizational Affiliation

    The Beatson Institute for Cancer Research, Garscube Estate, Switchback Road, Glasgow, G61 1BD, United Kingdom.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
UBIQUITIN-CONJUGATING ENZYME E2 D2
A, D
147Homo sapiensMutation(s): 3 
EC: 6.3.2.19 (PDB Primary Data), 2.3.2.24 (UniProt), 2.3.2.23 (UniProt)
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Find proteins for P62837 (Homo sapiens)
Explore P62837 
Go to UniProtKB:  P62837
PHAROS:  P62837
GTEx:  ENSG00000131508 
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UniProt GroupP62837
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
BACULOVIRAL IAP REPEAT-CONTAINING PROTEIN 7
B, E
62Homo sapiensMutation(s): 0 
EC: 6.3.2 (PDB Primary Data), 2.3.2.27 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for Q96CA5 (Homo sapiens)
Explore Q96CA5 
Go to UniProtKB:  Q96CA5
PHAROS:  Q96CA5
GTEx:  ENSG00000101197 
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UniProt GroupQ96CA5
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
POLYUBIQUITIN-C
C, F
81Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P0CG48 (Homo sapiens)
Explore P0CG48 
Go to UniProtKB:  P0CG48
PHAROS:  P0CG48
GTEx:  ENSG00000150991 
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UniProt GroupP0CG48
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.18 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.204 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.64α = 90
b = 100.64β = 90
c = 123.899γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-08-15
    Type: Initial release
  • Version 1.1: 2012-09-26
    Changes: Database references
  • Version 1.2: 2019-07-31
    Changes: Advisory, Data collection, Derived calculations
  • Version 1.3: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description