Crystal structure of 14-3-3sigma and a p53 C-terminal 12-mer synthetic phosphopeptide stabilized by Fusicoccin-A

Experimental Data Snapshot

  • Resolution: 1.20 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.154 
  • R-Value Observed: 0.155 

Starting Model: experimental
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Small-molecule stabilization of the p53 - 14-3-3 protein-protein interaction.

Doveston, R.G.Kuusk, A.Andrei, S.A.Leysen, S.Cao, Q.Castaldi, M.P.Hendricks, A.Brunsveld, L.Chen, H.Boyd, H.Ottmann, C.

(2017) FEBS Lett 591: 2449-2457

  • DOI: https://doi.org/10.1002/1873-3468.12723
  • Primary Citation of Related Structures:  
    5MHC, 5MOC, 5MXO

  • PubMed Abstract: 

    14-3-3 proteins are positive regulators of the tumor suppressor p53, the mutation of which is implicated in many human cancers. Current strategies for targeting of p53 involve restoration of wild-type function or inhibition of the interaction with MDM2, its key negative regulator. Despite the efficacy of these strategies, the alternate approach of stabilizing the interaction of p53 with positive regulators and, thus, enhancing tumor suppressor activity, has not been explored. Here, we report the first example of small-molecule stabilization of the 14-3-3 - p53 protein-protein interaction (PPI) and demonstrate the potential of this approach as a therapeutic modality. We also observed a disconnect between biophysical and crystallographic data in the presence of a stabilizing molecule, which is unusual in 14-3-3 PPIs.

  • Organizational Affiliation

    Laboratory of Chemical Biology, Department of Biomedical Engineering and Institute for Complex Molecular Systems, Eindhoven University of Technology, The Netherlands.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
14-3-3 protein sigma236Homo sapiensMutation(s): 0 
Gene Names: SFNHME1
UniProt & NIH Common Fund Data Resources
Find proteins for P31947 (Homo sapiens)
Explore P31947 
Go to UniProtKB:  P31947
GTEx:  ENSG00000175793 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP31947
Sequence Annotations
  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
p53 C-terminal 12 amino acidsB [auth P]3synthetic constructMutation(s): 0 
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on TPO
Experimental Data & Validation

Experimental Data

  • Resolution: 1.20 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.154 
  • R-Value Observed: 0.155 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.688α = 90
b = 111.56β = 90
c = 62.69γ = 90
Software Package:
Software NamePurpose
Aimlessdata scaling
PDB_EXTRACTdata extraction
MOSFLMdata reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Marie CurieNetherlandsPIAP-GA-2011-286418 14-3-3stab

Revision History  (Full details and data files)

  • Version 1.0: 2017-11-08
    Type: Initial release
  • Version 2.0: 2019-03-13
    Changes: Atomic model, Data collection, Derived calculations
  • Version 2.1: 2024-01-17
    Changes: Data collection, Database references, Derived calculations, Refinement description