Ubiquitin-conjugating enzyme E2-25 kDa (Huntington interacting protein 2)

Experimental Data Snapshot

  • Resolution: 2.40 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.225 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Structural basis of E2-25K/UBB+1 interaction leading to proteasome inhibition and neurotoxicity

Ko, S.Kang, G.B.Song, S.M.Lee, J.-G.Shin, D.Y.Yun, J.-H.Sheng, Y.Cheong, C.Jeon, Y.H.Jung, Y.-K.Arrowsmith, C.H.Avvakumov, G.V.Dhe-Paganon, S.Yoo, Y.J.Eom, S.H.Lee, W.

(2010) J Biol Chem 285: 36070-36080

  • DOI: https://doi.org/10.1074/jbc.M110.145219
  • Primary Citation of Related Structures:  
    1YLA, 3K9P

  • PubMed Abstract: 

    E2-25K/Hip2 is an unusual ubiquitin-conjugating enzyme that interacts with the frameshift mutant of ubiquitin B (UBB(+1)) and has been identified as a crucial factor regulating amyloid-β neurotoxicity. To study the structural basis of the neurotoxicity mediated by the E2-25K-UBB(+1) interaction, we determined the three-dimensional structures of UBB(+1), E2-25K and the E2-25K/ubiquitin, and E2-25K/UBB(+1) complex. The structures revealed that ubiquitin or UBB(+1) is bound to E2-25K via the enzyme MGF motif and residues in α9 of the enzyme. Polyubiquitylation assays together with analyses of various E2-25K mutants showed that disrupting UBB(+1) binding markedly diminishes synthesis of neurotoxic UBB(+1)-anchored polyubiquitin. These results suggest that the interaction between E2-25K and UBB(+1) is critical for the synthesis and accumulation of UBB(+1)-anchored polyubiquitin, which results in proteasomal inhibition and neuronal cell death.

  • Organizational Affiliation

    Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul 120-749, Korea.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ubiquitin-conjugating enzyme E2-25 kDa
A, B
202Homo sapiensMutation(s): 0 
Gene Names: HIP2LIG
UniProt & NIH Common Fund Data Resources
Find proteins for P61086 (Homo sapiens)
Explore P61086 
Go to UniProtKB:  P61086
GTEx:  ENSG00000078140 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP61086
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.40 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.225 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 37.831α = 64.19
b = 55.022β = 74.61
c = 61.762γ = 69.89
Software Package:
Software NamePurpose
CrystalCleardata reduction
CrystalCleardata scaling

Structure Validation

View Full Validation Report

Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2005-02-01
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-23
    Changes: Data collection, Database references, Refinement description