Structure of hDMX with Dimer Inducing Indolyl Hydantoin RO-2443

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.187 

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Activation of the p53 pathway by small-molecule-induced MDM2 and MDMX dimerization.

Graves, B.Thompson, T.Xia, M.Janson, C.Lukacs, C.Deo, D.Di Lello, P.Fry, D.Garvie, C.Huang, K.S.Gao, L.Tovar, C.Lovey, A.Wanner, J.Vassilev, L.T.

(2012) Proc Natl Acad Sci U S A 109: 11788-11793

  • DOI: https://doi.org/10.1073/pnas.1203789109
  • Primary Citation of Related Structures:  
    3U15, 3VBG

  • PubMed Abstract: 

    Activation of p53 tumor suppressor by antagonizing its negative regulator murine double minute (MDM)2 has been considered an attractive strategy for cancer therapy and several classes of p53-MDM2 binding inhibitors have been developed. However, these compounds do not inhibit the p53-MDMX interaction, and their effectiveness can be compromised in tumors overexpressing MDMX. Here, we identify small molecules that potently block p53 binding with both MDM2 and MDMX by inhibitor-driven homo- and/or heterodimerization of MDM2 and MDMX proteins. Structural studies revealed that the inhibitors bind into and occlude the p53 pockets of MDM2 and MDMX by inducing the formation of dimeric protein complexes kept together by a dimeric small-molecule core. This mode of action effectively stabilized p53 and activated p53 signaling in cancer cells, leading to cell cycle arrest and apoptosis. Dual MDM2/MDMX antagonists restored p53 apoptotic activity in the presence of high levels of MDMX and may offer a more effective therapeutic modality for MDMX-overexpressing cancers.

  • Organizational Affiliation

    Roche Research Center, Hoffmann-La Roche Inc., Nutley, NJ 07110, USA. bradford.graves@roche.com

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein Mdm4
A, B, C, D
100Homo sapiensMutation(s): 1 
Gene Names: MDM4MDMX
UniProt & NIH Common Fund Data Resources
Find proteins for O15151 (Homo sapiens)
Explore O15151 
Go to UniProtKB:  O15151
PHAROS:  O15151
GTEx:  ENSG00000198625 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO15151
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.187 
  • Space Group: P 31
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.031α = 90
b = 73.031β = 90
c = 68.774γ = 120
Software Package:
Software NamePurpose
MAR345data collection
CrystalCleardata reduction
CrystalCleardata 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: 2012-06-27
    Type: Initial release
  • Version 1.1: 2012-07-25
    Changes: Database references
  • Version 1.2: 2012-08-01
    Changes: Database references
  • Version 1.3: 2017-11-08
    Changes: Refinement description
  • Version 1.4: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description