6HKF

Ternary complex of Estrogen Receptor alpha peptide and 14-3-3 sigma C42 mutant bound to disulfide fragment PPI stabilizer 4

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.182 

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Literature

Site-Directed Fragment-Based Screening for the Discovery of Protein-Protein Interaction Stabilizers.

Sijbesma, E., Hallenbeck, K.K., Leysen, S., de Vink, P.J., Skora, L., Jahnke, W., Brunsveld, L., Arkin, M.R., Ottmann, C.

(2019) J Am Chem Soc 141: 3524-3531

  • DOI: 10.1021/jacs.8b11658
  • Primary Citation of Related Structures:  
    6HHP, 6HKB, 6HKF, 6HMT, 6HMU, 6HN2

  • PubMed Abstract: 

    • Modulation of protein-protein interactions (PPIs) by small molecules has emerged as a valuable approach in drug discovery. Compared to direct inhibition, PPI stabilization is vastly underexplored but has strong advantages, including the ability to gain selectivity by targeting an interface formed only upon association of proteins ...

    Modulation of protein-protein interactions (PPIs) by small molecules has emerged as a valuable approach in drug discovery. Compared to direct inhibition, PPI stabilization is vastly underexplored but has strong advantages, including the ability to gain selectivity by targeting an interface formed only upon association of proteins. Here, we present the application of a site-directed screening technique based on disulfide trapping (tethering) to select for fragments that enhance the affinity between protein partners. We target the phosphorylation-dependent interaction between the hub protein 14-3-3σ and a peptide derived from Estrogen Receptor α (ERα), an important breast cancer target that is negatively regulated by 14-3-3σ. We identify orthosteric stabilizers that increase 14-3-3/ERα affinity up to 40-fold and propose the mechanism of stabilization based on X-ray crystal structures. These fragments already display partial selectivity toward ERα-like motifs over other representative 14-3-3 clients. This first of its kind study illustrates the potential of the tethering approach to overcome the hurdles in systematic PPI stabilizer discovery.

    Organizational Affiliation: 

    Department of Chemistry , University of Duisburg-Essen , 47057 Essen , Germany.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
14-3-3 protein sigmaA236Homo sapiensMutation(s): 2 
Gene Names: SFN, HME1
UniProt & NIH Common Fund Data Resources
Find proteins for P31947 (Homo sapiens)
Explore P31947 
Go to UniProtKB:  P31947
PHAROS:  P31947
GTEx:  ENSG00000175793 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP31947
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Estrogen receptorB8Homo sapiensMutation(s): 0 
Gene Names: ESR1, ESR, NR3A1
UniProt & NIH Common Fund Data Resources
Find proteins for P03372 (Homo sapiens)
Explore P03372 
Go to UniProtKB:  P03372
PHAROS:  P03372
GTEx:  ENSG00000091831 
Entity Groups  
UniProt GroupP03372
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
G8T (Subject of Investigation/LOI)
Query on G8T
Download Ideal Coordinates CCD File 
F [auth A](1~{S})-2,2-diphenyl-1-(2-sulfanylethylamino)propan-1-ol
C17 H21 N O S
KDPCPEKIGGUZRH-INIZCTEOSA-N		 Ligand Interaction
MG
Query on MG
Download Ideal Coordinates CCD File 
C [auth A],
D [auth A],
E [auth A]		MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
TPO
Query on TPO		B L-PEPTIDE LINKINGC4 H10 N O6 PTHR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.182 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.019α = 90
b = 112.531β = 90
c = 62.467γ = 90
Software Package:
Software NamePurpose
Aimlessdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
BUSTERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Netherlands Organisation for Scientific ResearchNetherlands024.001.035

Revision History  (Full details and data files)

  • Version 1.0: 2019-02-27
    Type: Initial release
  • Version 1.1: 2019-03-06
    Changes: Data collection, Database references