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Related Experiment Videos

Binding in the growth hormone receptor complex

J A Wells1

  • 1Department of Protein Engineering, Genentech, Inc., South San Francisco, CA 94080, USA.

Proceedings of the National Academy of Sciences of the United States of America
|January 9, 1996
PubMed
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Human growth hormone (hGH) binding to its receptor involves two sites, sequentially activating the receptor. This mechanism allows for the development of potent receptor antagonists by mutating hGH binding sites.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Protein-protein interactions are crucial for biological processes.
  • Hormone-receptor binding initiates cellular signaling pathways.
  • Understanding human growth hormone (hGH) receptor activation is key to signal transduction.

Purpose of the Study:

  • To elucidate the molecular mechanism of hGH receptor activation.
  • To identify key binding sites and interactions between hGH and its receptor.
  • To explore strategies for developing hGH receptor antagonists.

Main Methods:

  • High-resolution structural and functional studies.
  • Alanine-scanning mutagenesis of hGH interface residues.
  • Kinetic analysis of binding reactions.

Related Experiment Videos

Main Results:

  • hGH binds two receptor molecules sequentially using distinct sites (site 1 and site 2).
  • Mutations blocking site 2 or enhancing site 1 binding can create potent antagonists.
  • Hydrophobic interactions at the site 1 interface are critical for complex stability.

Conclusions:

  • hGH-receptor interaction is a sequential dimerization process activating the receptor.
  • The identified binding principles are likely applicable to other protein-protein interactions.
  • This study provides a foundation for designing targeted therapeutics modulating hGH signaling.