1xgq
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| , resolution 2.10Å | |||||||
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| Activity: | Lysozyme, with EC number 3.2.1.17 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Structure for antibody HyHEL-63 Y33V mutant complexed with hen egg lysozyme
OverviewOverview
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.
About this StructureAbout this Structure
1XGQ is a Single protein structure of sequence from Gallus gallus and Mus musculus. Full crystallographic information is available from OCA.
ReferenceReference
Magnitude of the hydrophobic effect at central versus peripheral sites in protein-protein interfaces., Li Y, Huang Y, Swaminathan CP, Smith-Gill SJ, Mariuzza RA, Structure. 2005 Feb;13(2):297-307. PMID:15698573
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