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Related Experiment Video

Updated: Jul 23, 2025

Real Time Measurements of Membrane Protein:Receptor Interactions Using Surface Plasmon Resonance SPR
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Characterization of Small Molecule-Protein Interactions Using SPR Method.

Binmei Sun1, Jianmei Xu1, Shaoqun Liu1

  • 1College of Horticulture, South China Agricultural University, Guangzhou, China.

Methods in Molecular Biology (Clifton, N.J.)
|July 14, 2023
PubMed
Summary

Surface plasmon resonance (SPR) assays monitor molecular interactions without labels. This study details using SPR to analyze flavonoid binding to glucose-regulated protein 78, optimizing the assay for affinity analysis.

Keywords:
BiacoreBinding affinityMolecular interactionMolecular recognitionSensor chipSurface plasmon resonance

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Area of Science:

  • Biochemistry
  • Biophysics
  • Analytical Chemistry

Background:

  • Surface Plasmon Resonance (SPR) is a label-free optical technique widely used for real-time monitoring of molecular interactions.
  • SPR assays are crucial for quantifying binding kinetics, affinity, specificity, and concentration in biochemical studies.
  • Understanding small molecule-protein interactions is vital in drug discovery and molecular biology.

Purpose of the Study:

  • To detail the application of an SPR assay for studying the interaction between flavonoids and glucose-regulated protein 78 (GRP78).
  • To provide a comprehensive guide on optimizing SPR assay steps for small molecule-protein binding analysis.
  • To demonstrate the quantification of binding affinity using SPR.

Main Methods:

  • Immobilization of glucose-regulated protein 78 onto a biosensor surface.
  • Optimization of SPR instrument setup and operational parameters.
  • Sample injection of flavonoids and real-time monitoring of binding events via refractive index changes.

Main Results:

  • Successful establishment of an SPR assay for flavonoid-GRP78 interaction analysis.
  • Quantification of binding affinity and kinetics between specific flavonoids and GRP78.
  • Demonstration of SPR's sensitivity and real-time monitoring capabilities for small molecule-protein interactions.

Conclusions:

  • SPR is a powerful and sensitive technique for characterizing small molecule-protein interactions.
  • The optimized SPR assay provides a reliable method for affinity analysis of flavonoids and GRP78.
  • This methodology can be applied to study other small molecule-protein binding events.