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
- PubMed: 22007755 
- DOI: 10.1021/ja2068752
- Primary Citation of Related Structures:  
3OV1, 3OVE, 3S8L, 3S8N, 3S8O - 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. 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 ...