Crystal Structure of the Grb2 SH2 Domain in Complex with a 20-Membered Macrocyclic Ligand Having the Sequence pYVNV

Experimental Data Snapshot

  • Resolution: 2.02 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.180 

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Thermodynamic and Structural Effects of Macrocyclization as a Constraining Method in Protein-Ligand Interactions.

Delorbe, J.E.Clements, J.H.Whiddon, B.B.Martin, S.F.

(2010) ACS Med Chem Lett 1: 448-452

  • DOI: https://doi.org/10.1021/ml100142y
  • Primary Citation of Related Structures:  
    3N7Y, 3N84, 3N8M

  • PubMed Abstract: 

    The thermodynamic and structural effects of macrocyclization as a tactic for stabilizing the biologically-active conformation of Grb2 SH2 binding peptides were investigated using isothermal titration calorimetry and x-ray crystallography. 23-Membered macrocycles containing the sequence pYVN were slightly more potent than their linear controls; however, preorganization did not necessarily eventuate in a more favorable binding entropy. Structures of complexes of macrocycle 7 and its acyclic control 8 are similar except for differences in relative orientations of corresponding atoms in the linking moieties of 7 and 8. There are no differences in the number of direct or water-mediated protein-ligand contacts that might account for the less favorable binding enthalpy of 7; however, an intramolecular hydrogen bond between the pY and pY+3 residues in 8 that is absent in 7 may be a factor. These studies highlight the difficulties associated with correlating energetics and structure in protein-ligand interactions.

  • Organizational Affiliation

    Department of Chemistry and Biochemistry, The Institute of Cellular and Molecular Biology, and The Texas Institute of Drug and Diagnostic Development, The University of Texas, Austin, Texas 78712, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Growth factor receptor-bound protein 2
A, B, C
98Homo sapiensMutation(s): 0 
Gene Names: GRB2ASH
UniProt & NIH Common Fund Data Resources
Find proteins for P62993 (Homo sapiens)
Explore P62993 
Go to UniProtKB:  P62993
PHAROS:  P62993
GTEx:  ENSG00000177885 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP62993
Sequence Annotations
  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
20-membered peptide-like macrocyclic ligand
D, E, F
5N/AMutation(s): 0 
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on PTR
D, E, F
Experimental Data & Validation

Experimental Data

  • Resolution: 2.02 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.180 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 83.162α = 90
b = 83.162β = 90
c = 96.009γ = 120
Software Package:
Software NamePurpose
CrystalCleardata collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-01-12
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description
  • Version 2.0: 2023-11-15
    Changes: Atomic model, Data collection, Derived calculations