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Evaluation of Galectin Binding by Surface Plasmon Resonance.

Padmaja Mehta-D'souza1

  • 1Oklahoma Medical Research Center, Oklahoma City, OK, USA. Padmaja-Mehta-DSouza@omrf.org.

Methods in Molecular Biology (Clifton, N.J.)
|March 23, 2022
PubMed
Summary

Surface plasmon resonance (SPR) instruments accurately measure real-time macromolecular binding. This study details using SPR to quantify the affinity of Galectins-1, -2, and -3 with their glycoside ligands.

Keywords:
AffinityAnalyteFlow cell (fc)GalectinGlycosidesLigandStreptavidin (SA) sensor chipSurface plasmon resonance (SPR)

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biophysics

Background:

  • Surface Plasmon Resonance (SPR) is a label-free optical technique for real-time analysis of molecular interactions.
  • Biacore instruments offer high sensitivity and low sample consumption, ideal for characterizing rapid kinetics and low-affinity binding.
  • Galectins are a family of beta-galactoside-binding proteins involved in diverse biological processes.

Purpose of the Study:

  • To describe the application of SPR for the affinity measurement of Galectins-1, -2, and -3.
  • To characterize the binding interactions between these galectins and their specific glycoside ligands.

Main Methods:

  • Utilizing a Biacore 3000 instrument for Surface Plasmon Resonance (SPR) measurements.
  • Immobilization of galectin ligands onto the SPR sensor chip.
  • Flowing different concentrations of Galectins-1, -2, and -3 over the immobilized ligands to determine binding kinetics and affinity.

Main Results:

  • Quantitative data on the binding affinities (Kd values) of Galectins-1, -2, and -3 to their respective glycoside ligands were obtained.
  • The SPR approach successfully measured the rapid kinetics and low affinities characteristic of these biological interactions.
  • Demonstrated the utility of SPR for precise characterization of galectin-ligand interactions.

Conclusions:

  • SPR is a powerful and sensitive method for determining the affinity and kinetics of galectin-ligand interactions.
  • The study provides valuable quantitative data for understanding the molecular recognition mechanisms of Galectins-1, -2, and -3.
  • This approach facilitates the study of numerous other biological interactions with similar characteristics.