2VJF

Crystal Structure of the MDM2-MDMX RING Domain Heterodimer

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.209 

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This is version 1.3 of the entry. See complete history. 


Literature

Structure of the Mdm2/Mdmx Ring Domain Heterodimer Reveals Dimerization is Required for Their Ubiquitylation in Trans.

Linke, K., Mace, P.D., Smith, C.A., Vaux, D.L., Silke, J., Day, C.L.

(2008) Cell Death Differ 15: 841

  • DOI: 10.1038/sj.cdd.4402309
  • Primary Citation of Related Structures:  
    2VJE, 2VJF

  • PubMed Abstract: 

    • MDM2, a ubiquitin E3-ligase of the RING family, has a key role in regulating p53 abundance. During normal non-stress conditions p53 is targeted for degradation by MDM2. MDM2 can also target itself and MDMX for degradation. MDMX is closely related to MDM2 but the RING domain of MDMX does not possess intrinsic E3-ligase activity ...

    MDM2, a ubiquitin E3-ligase of the RING family, has a key role in regulating p53 abundance. During normal non-stress conditions p53 is targeted for degradation by MDM2. MDM2 can also target itself and MDMX for degradation. MDMX is closely related to MDM2 but the RING domain of MDMX does not possess intrinsic E3-ligase activity. Instead, MDMX regulates p53 abundance by modulating the levels and activity of MDM2. Dimerization, mediated by the conserved C-terminal RING domains of both MDM2 and MDMX, is critical to this activity. Here we report the crystal structure of the MDM2/MDMX RING domain heterodimer and map residues required for functional interaction with the E2 (UbcH5b). In both MDM2 and MDMX residues C-terminal to the RING domain have a key role in dimer formation. In addition we show that these residues are part of an extended surface that is essential for ubiquitylation in trans. This study provides a molecular basis for understanding how heterodimer formation leads to stabilization of MDM2, yet degradation of p53, and suggests novel targets for therapeutic intervention.

    Organizational Affiliation: 

    Department of Biochemistry, University of Otago, Dunedin, New Zealand.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
E3 UBIQUITIN-PROTEIN LIGASE MDM2A, C64Homo sapiensMutation(s): 0 
Gene Names: MDM2
EC: 6.3.2 (PDB Primary Data), 2.3.2.27 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for Q00987 (Homo sapiens)
Explore Q00987 
Go to UniProtKB:  Q00987
PHAROS:  Q00987
Entity Groups  
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UniProt GroupQ00987
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
MDM4 PROTEINB, D63Homo sapiensMutation(s): 0 
Gene Names: MDM4, MDMX
UniProt & NIH Common Fund Data Resources
Find proteins for O15151 (Homo sapiens)
Explore O15151 
Go to UniProtKB:  O15151
PHAROS:  O15151
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO15151
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.209 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.216α = 90
b = 41.784β = 109.03
c = 76.939γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-05-13
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-10-09
    Changes: Data collection, Derived calculations, Other