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Related Experiment Videos

Comparison of a structural and a functional epitope

B C Cunningham1, J A Wells

  • 1Department of Protein Engineering Genetech. Inc., South San Francisco, CA 94080-4990.

Journal of Molecular Biology
|December 5, 1993
PubMed
Summary

A small fraction of buried side-chains drives most of the binding energy between human growth hormone (hGH) and its receptor (hGHbp). These key residues primarily slow dissociation, suggesting potential for designing smaller hormone mimics.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • The interaction between human growth hormone (hGH) and its receptor (hGHbp) is crucial for biological function.
  • Understanding the energetic contributions of interface residues is key to elucidating binding mechanisms.

Purpose of the Study:

  • To comprehensively analyze the energetic importance of side-chains at the hGH-hGHbp interface.
  • To determine the roles of contact side-chains in modulating binding affinity and kinetics.

Main Methods:

  • Site-directed mutagenesis of hGH, converting interface side-chains to alanine.
  • Kinetic and affinity measurements using a biosensor device detecting refractive index changes.
  • Validation of biosensor data against radio-immune assay results.

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Main Results:

  • A small subset of buried side-chains (approx. 25%) accounts for the majority of the binding energy.
  • Key residues cluster at the center of the structural epitope.
  • Mutations predominantly increase the dissociation rate (off-rate) rather than affecting the association rate (on-rate).
  • Electrostatic interactions, particularly involving Arg residues, significantly modulate association (contributing ~20-fold to the on-rate).

Conclusions:

  • hGH-hGHbp association involves diffusion and electrostatics, forming transient collisional complexes.
  • The final bound complex is stabilized by a limited number of contacts.
  • Favorable pre-binding interactions (solvation, intra-molecular interactions) may limit energy gain upon binding.
  • The functional epitope is significantly smaller than the structural epitope, indicating potential for designing smaller hormone mimics.