3S8L

Protein-Ligand Interactions: Thermodynamic Effects Associated with Increasing Hydrophobic Surface Area


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.71 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.196 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Protein-ligand interactions: thermodynamic effects associated with increasing nonpolar surface area.

Myslinski, J.M.Delorbe, J.E.Clements, J.H.Martin, S.F.

(2011) J.Am.Chem.Soc. 133: 18518-18521

  • DOI: 10.1021/ja2068752
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Thermodynamic parameters were determined for complex formation between the Grb2 SH2 domain and Ac-pTyr-Xaa-Asn derived tripeptides in which the Xaa residue is an α,α-cycloaliphatic amino acid that varies in ring size from three- to seven-membered. Al ...

    Thermodynamic parameters were determined for complex formation between the Grb2 SH2 domain and Ac-pTyr-Xaa-Asn derived tripeptides in which the Xaa residue is an α,α-cycloaliphatic amino acid that varies in ring size from three- to seven-membered. Although the six- and seven-membered ring analogs are approximately equipotent, binding affinities of those having three- to six-membered rings increase incrementally with ring size because increasingly more favorable binding enthalpies dominate increasingly less favorable binding entropies, a finding consistent with an enthalpy-driven hydrophobic effect. Crystallographic analysis reveals that the only significant differences in structures of the complexes are in the number of van der Waals contacts between the domain and the methylene groups in the Xaa residues. There is a positive correlation between buried nonpolar surface area and binding free energy and enthalpy, but not with ΔC(p). Displacing a water molecule from a protein-ligand interface is not necessarily reflected in a favorable change in binding entropy. These findings highlight some of the fallibilities associated with commonly held views of relationships of structure and energetics in protein-ligand interactions and have significant implications for ligand design.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Growth factor receptor-bound protein 2
A
117Homo sapiensMutation(s): 0 
Gene Names: GRB2 (ASH)
Find proteins for P62993 (Homo sapiens)
Go to Gene View: GRB2
Go to UniProtKB:  P62993
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
pYAc4cN
B
5N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
GOL
Query on GOL

Download SDF File 
Download CCD File 
A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  4 Unique
IDChainsTypeFormula2D DiagramParent
NH2
Query on NH2
B
NON-POLYMERH2 N

--

PTR
Query on PTR
B
L-PEPTIDE LINKINGC9 H12 N O6 PTYR
192
Query on 192
B
PEPTIDE LINKINGC5 H9 N O2

--

ACE
Query on ACE
B
NON-POLYMERC2 H4 O

--

Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.71 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.196 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 42.072α = 90.00
b = 42.072β = 90.00
c = 108.755γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
HKL-2000data reduction
REFMACrefinement
HKL-2000data scaling
CrystalCleardata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-11-02
    Type: Initial release
  • Version 1.1: 2011-12-07
    Type: Database references