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Related Experiment Videos

Mechanism for ordered receptor binding by human prolactin.

Umasundari Sivaprasad1, Jeffrey M Canfield, Charles L Brooks

  • 1The Ohio State Biochemistry Program and Department of Veterinary Biosciences, The Ohio State University, Columbus, Ohio 43210, USA.

Biochemistry
|October 27, 2004
PubMed
Summary

Human prolactin (hPRL) binding to its receptor involves sequential interactions at site 1 and site 2. Site 2 binding depends on site 1 occupancy, suggesting an induced-fit mechanism for hormone-receptor complex formation.

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Area of Science:

  • Endocrinology
  • Molecular Biology
  • Biochemistry

Background:

  • Prolactin (PRL) is a lactogenic hormone crucial for various physiological processes.
  • PRL interacts with prolactin receptors (PRLR) through sequential binding events at distinct sites on the hormone.

Purpose of the Study:

  • To elucidate the binding mechanism of human prolactin (hPRL) to the extracellular domain of the human prolactin receptor (hPRLbp).
  • To investigate the functional coupling and affinity dynamics between the two receptor binding sites on hPRL.

Main Methods:

  • Surface Plasmon Resonance (SPR) technology was employed to study hPRL-hPRLbp interactions.
  • Covalent immobilization of hPRL on SPR chips, blocking either site 1 or site 2, was used to assess binding dependencies.
  • Mutagenesis and Fluorescence Resonance Energy Transfer (FRET) experiments were conducted to validate binding models.

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Main Results:

  • Site 2 binding of hPRLbp is dependent on prior site 1 receptor occupancy.
  • Site 1 binding affinity is independent of site 2 occupancy, indicating functional coupling.
  • hPRL undergoes a conformational change upon first receptor binding, facilitating subsequent binding at site 2, supporting an induced-fit model.

Conclusions:

  • The binding of hPRL to its receptor follows an ordered, induced-fit mechanism.
  • Functional coupling between site 1 and site 2 is essential for high-affinity hormone-receptor complex formation.
  • Understanding this mechanism provides insights into prolactin signaling pathways and potential therapeutic targets.