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G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
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Drug-receptor interaction describes the binding of receptors by drugs, but not all drug-receptor interactions result in activation and tissue response. For instance, the binding of agonists activates the receptor to generate a cellular reaction, while antagonists bind to receptors without causing their activation.
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The receptor occupancy theory connects a drug's response to the number of occupied receptors. With higher drug concentrations, more receptors are occupied, leading to increased responses. The formation of drug-receptor complexes involves association and dissociation rates, which reach equilibrium when the forward and backward reactions are equal. The equilibrium association constant (Ka) and its inverse, the equilibrium dissociation constant (Kd), indicate drug affinity. Higher Ka and lower...
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Related Experiment Video

Updated: Feb 2, 2026

Biosensor-based High Throughput Biopanning and Bioinformatics Analysis Strategy for the Global Validation of Drug-protein Interactions
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High-Throughput, Biosensor-Based Approach to Examine Bone Morphogenetic Protein (BMP)-Receptor Interactions.

Senem Aykul1, Erik Martinez-Hackert2

  • 1Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI, USA.

Methods in Molecular Biology (Clifton, N.J.)
|November 11, 2018
PubMed
Summary

This study introduces a rapid surface plasmon resonance (SPR) method to identify bone morphogenetic protein (BMP) receptor interactions. The technique efficiently characterizes BMP-receptor complexes, crucial for understanding BMP signaling pathways.

Keywords:
ActivinBone morphogenetic proteinProtein–protein interaction sSurface plasmon resonanceTGF-β

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Signaling

Background:

  • Bone morphogenetic proteins (BMPs) initiate signaling cascades upon binding to cell surface receptors.
  • Understanding BMP-receptor complex formation is essential for elucidating BMP physiological functions.
  • Existing methods for characterizing these interactions can be time-consuming.

Purpose of the Study:

  • To develop a high-throughput surface plasmon resonance (SPR) based assay for rapid identification and evaluation of BMP-receptor complexes.
  • To enable accurate characterization of binding affinities between various BMPs and their cognate receptors.

Main Methods:

  • Extracellular, BMP-binding domains of receptors were engineered as human IgG1-Fc-fusion proteins.
  • Fc-receptor-fusion proteins were immobilized onto a sensor chip for SPR analysis.
  • BMPs were injected at a fixed concentration (60-100 nM) to assess binding kinetics and affinity.

Main Results:

  • The SPR assay successfully identified and stratified BMP-receptor interactions based on binding affinity (high, medium, low).
  • The method demonstrated high reproducibility and ensured full receptor activity.
  • Equilibrium dissociation constants were accurately estimated for high- and medium-affinity binders from single injection curves.

Conclusions:

  • The developed SPR approach provides a fast, efficient, and accurate method for characterizing BMP-receptor interactions.
  • This technique facilitates a deeper understanding of BMP signaling pathways and their physiological roles.
  • The assay is valuable for drug discovery and research involving BMPs and their receptors.