6SQO

Crystal structure of human MDM2 RING domain homodimer bound to UbcH5B-Ub


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.41 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.139 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural basis for DNA damage-induced phosphoregulation of MDM2 RING domain.

Magnussen, H.M.Ahmed, S.F.Sibbet, G.J.Hristova, V.A.Nomura, K.Hock, A.K.Archibald, L.J.Jamieson, A.G.Fushman, D.Vousden, K.H.Weissman, A.M.Huang, D.T.

(2020) Nat Commun 11: 2094-2094

  • DOI: 10.1038/s41467-020-15783-y
  • Primary Citation of Related Structures:  
    6SQO, 6SQP, 6SQS, 6SQR

  • PubMed Abstract: 
  • Phosphorylation of MDM2 by ATM upon DNA damage is an important mechanism for deregulating MDM2, thereby leading to p53 activation. ATM phosphorylates multiple residues near the RING domain of MDM2, but the underlying molecular basis for deregulation rema ...

    Phosphorylation of MDM2 by ATM upon DNA damage is an important mechanism for deregulating MDM2, thereby leading to p53 activation. ATM phosphorylates multiple residues near the RING domain of MDM2, but the underlying molecular basis for deregulation remains elusive. Here we show that Ser429 phosphorylation selectively enhances the ubiquitin ligase activity of MDM2 homodimer but not MDM2-MDMX heterodimer. A crystal structure of phospho-Ser429 (pS429)-MDM2 bound to E2-ubiquitin reveals a unique 3 10 -helical feature present in MDM2 homodimer that allows pS429 to stabilize the closed E2-ubiquitin conformation and thereby enhancing ubiquitin transfer. In cells Ser429 phosphorylation increases MDM2 autoubiquitination and degradation upon DNA damage, whereas S429A substitution protects MDM2 from auto-degradation. Our results demonstrate that Ser429 phosphorylation serves as a switch to boost the activity of MDM2 homodimer and promote its self-destruction to enable rapid p53 stabilization and resolve a long-standing controversy surrounding MDM2 auto-degradation in response to DNA damage.


    Organizational Affiliation

    Institute of Cancer Sciences, University of Glasgow, Glasgow, G61 1QH, UK. d.huang@beatson.gla.ac.uk.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
E3 ubiquitin-protein ligase Mdm2 AD62Homo sapiensMutation(s): 0 
Gene Names: MDM2
EC: 2.3.2.27
Find proteins for Q00987 (Homo sapiens)
Explore Q00987 
Go to UniProtKB:  Q00987
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PHAROS:  Q00987
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Ubiquitin-conjugating enzyme E2 D2 BE146Homo sapiensMutation(s): 2 
Gene Names: UBE2D2PUBC1UBC4UBC5BUBCH4UBCH5B
EC: 2.3.2.23 (PDB Primary Data), 2.3.2.24 (PDB Primary Data)
Find proteins for P62837 (Homo sapiens)
Explore P62837 
Go to UniProtKB:  P62837
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PHAROS:  P62837
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Ubiquitin-40S ribosomal protein S27a CF77Homo sapiensMutation(s): 0 
Gene Names: RPS27AUBA80UBCEP1
Find proteins for P62979 (Homo sapiens)
Explore P62979 
Go to UniProtKB:  P62979
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PHAROS:  P62979
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.41 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.139 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 129.709α = 90
b = 129.709β = 90
c = 70.537γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
xia2data reduction
xia2data scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Cancer Research UKUnited KingdomA23278
European Research CouncilBelgium647849

Revision History 

  • Version 1.0: 2020-05-06
    Type: Initial release
  • Version 1.1: 2020-05-13
    Changes: Database references