Mono- and bivalent 14-3-3 inhibitors for characterizing supramolecular lysine-PEG interactions in proteins

Experimental Data Snapshot

  • Resolution: 2.27 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.232 

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Mono- and Bivalent 14-3-3 Inhibitors for Characterizing Supramolecular "Lysine Wrapping" of Oligoethylene Glycol (OEG) Moieties in Proteins.

Yilmaz, E.Bier, D.Guillory, X.Briels, J.Ruiz-Blanco, Y.B.Sanchez-Garcia, E.Ottmann, C.Kaiser, M.

(2018) Chemistry 24: 13807-13814

  • DOI: https://doi.org/10.1002/chem.201801074
  • Primary Citation of Related Structures:  
    6FN9, 6FNA, 6FNB, 6FNC

  • PubMed Abstract: 

    Previous studies have indicated the presence of defined interactions between oligo or poly(ethylene glycol) (OEG or PEG) and lysine residues. In these interactions, the OEG or PEG residues "wrap around" the lysine amino group, thereby enabling complexation of the amino group by the ether oxygen residues. The resulting biochemical binding affinity and thus biological relevance of this supramolecular interaction however remains unclear so far. Here, we report that OEG-containing phosphophenol ether inhibitors of 14-3-3 proteins also display such a "lysine-wrapping" binding mode. For better investigating the biochemical relevance of this binding mode, we made use of the dimeric nature of 14-3-3 proteins and designed as well as synthesized a set of bivalent 14-3-3 inhibitors for biochemical and X-ray crystallography-based structural studies. We found that all synthesized derivatives adapted the "lysine-wrapping" binding mode in the crystal structures; in solution, a different binding mode is however observed, most probably as the "lysine-wrapping" binding mode turned out to be a rather weak interaction. Accordingly, our studies demonstrate that structural studies of OEG-lysine interactions are difficult to interpret and their presence in structural studies may not automatically be correlated with a relevant interaction also in solution but requires further biochemical studies.

  • Organizational Affiliation

    Chemical Biology, Zentrum für Medizinische Biotechnologie, Fakultät für Biologie, Universität Duisburg-Essen, Universitätsstr. 2, 45117, Essen, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
14-3-3 protein zeta/delta
A, B
230Homo sapiensMutation(s): 0 
Gene Names: YWHAZ
UniProt & NIH Common Fund Data Resources
Find proteins for P63104 (Homo sapiens)
Explore P63104 
Go to UniProtKB:  P63104
PHAROS:  P63104
GTEx:  ENSG00000164924 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP63104
Sequence Annotations
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
DW8 Binding MOAD:  6FN9 IC50: 2.84e+5 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.27 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.232 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.94α = 90
b = 102.42β = 90
c = 113.57γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
German Research FoundationGermanyCRC1093 (Supramolecular Chemistry on Proteins)

Revision History  (Full details and data files)

  • Version 1.0: 2018-07-04
    Type: Initial release
  • Version 1.1: 2018-10-03
    Changes: Data collection, Database references
  • Version 1.2: 2018-12-19
    Changes: Data collection, Derived calculations
  • Version 1.3: 2024-05-08
    Changes: Data collection, Database references