Human Cdc34 E2 in complex with CC0651 inhibitor

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.223 

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An allosteric inhibitor of the human cdc34 ubiquitin conjugating enzyme

Ceccarelli, D.F.Tang, X.Pelletier, B.Orlicky, S.Xie, W.Plantevin, V.Neculai, D.Chou, Y.C.Ogunjimi, A.Al-Hakim, A.Varelas, X.Koszela, J.Wasney, G.A.Vedadi, M.Dhe-Paganon, S.Cox, S.Xu, S.Lopez-Girona, A.Mercurio, F.Wrana, J.Durocher, D.Meloche, S.Webb, D.R.Tyers, M.Sicheri, F.

(2011) Cell 145: 1075-1087

  • DOI: https://doi.org/10.1016/j.cell.2011.05.039
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    In the ubiquitin-proteasome system (UPS), E2 enzymes mediate the conjugation of ubiquitin to substrates and thereby control protein stability and interactions. The E2 enzyme hCdc34 catalyzes the ubiquitination of hundreds of proteins in conjunction with the cullin-RING (CRL) superfamily of E3 enzymes. We identified a small molecule termed CC0651 that selectively inhibits hCdc34. Structure determination revealed that CC0651 inserts into a cryptic binding pocket on hCdc34 distant from the catalytic site, causing subtle but wholesale displacement of E2 secondary structural elements. CC0651 analogs inhibited proliferation of human cancer cell lines and caused accumulation of the SCF(Skp2) substrate p27(Kip1). CC0651 does not affect hCdc34 interactions with E1 or E3 enzymes or the formation of the ubiquitin thioester but instead interferes with the discharge of ubiquitin to acceptor lysine residues. E2 enzymes are thus susceptible to noncatalytic site inhibition and may represent a viable class of drug target in the UPS.

  • Organizational Affiliation

    Center for Systems Biology, Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario M5G1X5, Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ubiquitin-conjugating enzyme E2 R1
A, B, C, D
183Homo sapiensMutation(s): 0 
Gene Names: CDC34UBCH3UBE2R1
UniProt & NIH Common Fund Data Resources
Find proteins for P49427 (Homo sapiens)
Explore P49427 
Go to UniProtKB:  P49427
PHAROS:  P49427
GTEx:  ENSG00000099804 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP49427
Sequence Annotations
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
U94 Binding MOAD:  3RZ3 IC50: 1720 (nM) from 1 assay(s)
PDBBind:  3RZ3 IC50: 1720 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.30 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.223 
  • Space Group: F 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 121.797α = 90
b = 139.525β = 90
c = 216.059γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-07-06
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description