1XGU

Structure for antibody HyHEL-63 Y33F mutant complexed with hen egg lysozyme

Summary for 1XGU

• Entry DOI: 10.2210/pdb1xgu/pdb
• Related: 1XGP 1XGQ 1XGR 1XGT
• Descriptor: antibody kappa light chain, antibody kappa heavy chain, Lysozyme C, ... (4 entities in total)
• Functional Keywords: hyhel-63, 2.1a crystal structure, y33f mutant, immune system
• Biological source: Mus musculus (mouse); More
• Total number of polymer chains: 3
• Total formula weight: 60455.05

Authors

Li, Y.,Huang, Y.,Swaminathan, C.P.,Smith-Gill, S.J.,Mariuzza, R.A. (deposition date: 2004-09-17, release date: 2005-09-06, Last modification date: 2013-10-02)

Primary citation

Li, Y.,Huang, Y.,Swaminathan, C.P.,Smith-Gill, S.J.,Mariuzza, R.A.
Magnitude of the hydrophobic effect at central versus peripheral sites in protein-protein interfaces
Structure, 13:297-307, 2005

PubMed Abstract: 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.

PubMed: 15698573
DOI: 10.1016/j.str.2004.12.012

Experimental method

X-RAY DIFFRACTION (2.1 Å)