1XGQ image
Entry Detail
PDB ID:
1XGQ
Keywords:
Title:
Structure for antibody HyHEL-63 Y33V mutant complexed with hen egg lysozyme
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2004-09-17
Release Date:
2005-09-06
Method Details:
Experimental Method:
Resolution:
2.10 Å
R-Value Free:
0.27
R-Value Work:
0.23
R-Value Observed:
0.23
Space Group:
P 42 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:antibody kappa light chain
Chain IDs:A
Chain Length:215
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Description:antibody kappa heavy chain
Mutations:Y33V
Chain IDs:B
Chain Length:210
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Description:Lysozyme C
Chain IDs:C
Chain Length:129
Number of Molecules:1
Biological Source:Gallus gallus
Primary Citation
Magnitude of the hydrophobic effect at central versus peripheral sites in protein-protein interfaces
Structure 13 297 307 (2005)
PMID: 15698573 DOI: 10.1016/j.str.2004.12.012

Abstact

Hydrophobic interactions are essential for stabilizing protein-protein complexes, whose interfaces generally consist of a central cluster of hot spot residues surrounded by less important peripheral residues. According to the O-ring hypothesis, a condition for high affinity binding is solvent exclusion from interacting residues. This hypothesis predicts that the hydrophobicity at the center is significantly greater than at the periphery, which we estimated at 21 cal mol(-1) A(-2). To measure the hydrophobicity at the center, structures of an antigen-antibody complex where a buried phenylalanine was replaced by smaller hydrophobic residues were determined. By correlating structural changes with binding free energies, we estimate the hydrophobicity at this central site to be 46 cal mol(-1) A(-2), twice that at the periphery. This context dependence of the hydrophobic effect explains the clustering of hot spots at interface centers and has implications for hot spot prediction and the design of small molecule inhibitors.

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