3FE7

Crystal Structure of HdmX bound to the p53-peptidomimetic Ac-Phe-Met-Aib-Pmp-Trp-Glu-Ac3c-Leu-NH2 at 1.35A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.35 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.192 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.5 of the entry. See complete history


Literature

Crystal Structures of Human MdmX (HdmX) in Complex with p53 Peptide Analogues Reveal Surprising Conformational Changes

Kallen, J.Goepfert, A.Blechschmidt, A.Izaac, A.Geiser, M.Tavares, G.Ramage, P.Furet, P.Masuya, K.Lisztwan, J.

(2009) J Biol Chem 284: 8812-8821

  • DOI: https://doi.org/10.1074/jbc.M809096200
  • Primary Citation of Related Structures:  
    3FE7, 3FEA

  • PubMed Abstract: 

    p53 tumor suppressor activity is negatively regulated through binding to the oncogenic proteins Hdm2 and HdmX. The p53 residues Leu(26), Trp(23), and Phe(19) are crucial to mediate these interactions. Inhibiting p53 binding to both Hdm2 and HdmX should be a promising clinical approach to reactivate p53 in the cancer setting, but previous studies have suggested that the discovery of dual Hdm2/HdmX inhibitors will be difficult. We have determined the crystal structures at 1.3 A of the N-terminal domain of HdmX bound to two p53 peptidomimetics without and with a 6-chlorine substituent on the indole (which binds in the same subpocket as Trp(23) of p53). The latter compound is the most potent peptide-based antagonist of the p53-Hdm2 interaction yet to be described. The x-ray structures revealed surprising conformational changes of the binding cleft of HdmX, including an "open conformation" of Tyr(99) and unexpected "cross-talk" between the Trp and Leu pockets. Notably, the 6-chloro p53 peptidomimetic bound with high affinity to both HdmX and Hdm2 (K(d) values of 36 and 7 nm, respectively). Our results suggest that the development of potent dual inhibitors for HdmX and Hdm2 should be feasible. They also reveal possible conformational states of HdmX, which should lead to a better prediction of its interactions with potential biological partners.


  • Organizational Affiliation

    Novartis Institutes for BioMedical Research, CH-4002 Basel, Switzerland. joerg.kallen@novartis.com


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Mdm4 protein100Homo 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
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  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
p53-peptidomimetic Ac-Phe-Met-Aib-Pmp-Trp-Glu-Ac3c-Leu-NH2B [auth L]10N/AMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Modified Residues  3 Unique
IDChains TypeFormula2D DiagramParent
1AC
Query on 1AC
B [auth L]PEPTIDE LINKINGC4 H7 N O2ALA
AIB
Query on AIB
B [auth L]L-PEPTIDE LINKINGC4 H9 N O2ALA
PM3
Query on PM3
B [auth L]L-PEPTIDE LINKINGC10 H14 N O5 PPHE
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.35 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.192 
  • Space Group: P 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.294α = 90
b = 43.294β = 90
c = 65.59γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

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Entry History 

Deposition Data

  • Released Date: 2009-01-27 
  • Deposition Author(s): Kallen, J.

Revision History  (Full details and data files)

  • Version 1.0: 2009-01-27
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-11-01
    Changes: Refinement description
  • Version 1.3: 2021-11-10
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-11-01
    Changes: Data collection, Refinement description
  • Version 1.5: 2023-11-22
    Changes: Data collection