2VJF

Crystal Structure of the MDM2-MDMX RING Domain Heterodimer

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.2 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:  

  • 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, 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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
E3 UBIQUITIN-PROTEIN LIGASE MDM2
A, C
64Homo sapiensMutation(s): 0 
Gene Names: MDM2
EC: 2.3.2.27
Find proteins for Q00987 (Homo sapiens)
Go to Gene View: MDM2
Go to UniProtKB:  Q00987
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
MDM4 PROTEIN
B, D
63Homo sapiensMutation(s): 0 
Gene Names: MDM4 (MDMX)
Find proteins for O15151 (Homo sapiens)
Go to Gene View: MDM4
Go to UniProtKB:  O15151
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN
Download SDF File 
Download CCD File 
A, B, C, D
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
FLC
Query on FLC
Download SDF File 
Download CCD File 
D
CITRATE ANION
C6 H5 O7
KRKNYBCHXYNGOX-UHFFFAOYSA-K
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.208 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 54.216α = 90.00
b = 41.784β = 109.03
c = 76.939γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
MOSFLMdata reduction
REFMACrefinement
PHASERphasing

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-05-13
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance