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Calculating Half Maximal Inhibitory Concentration (IC50) Values from Glycomics Microarray Data Using GraphPad Prism.

Marie Le Berre1,2, Jared Q Gerlach2, Iwona Dziembała1

  • 1Carbohydrate Signalling Group, Discipline of Microbiology, School of Natural Sciences, National University of Ireland Galway, Galway, Ireland.

Methods in Molecular Biology (Clifton, N.J.)
|January 1, 2022
PubMed
Summary

This study details a method for determining the half maximal inhibitory concentration (IC50) of molecules that inhibit lectin binding. The described glycan microarray technique provides a standardized approach for comparing carbohydrate inhibitor efficiency.

Keywords:
Glycan microarraysHalf maximal inhibitor concentrationHaptenic sugarIC50 concentrationIC50 valueInhibitionLactoseLectinMAAMAL

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Area of Science:

  • Carbohydrate Chemistry
  • Biochemistry
  • Glycobiology

Background:

  • Half maximal inhibitory concentration (IC50) is crucial for comparing carbohydrate inhibitor efficiency against lectin binding.
  • Existing methods for IC50 calculation include ELISA, ITC, and glycan microarrays, each with specific applications.
  • Standardized protocols are needed for reliable IC50 determination in lectin-glycan interactions.

Purpose of the Study:

  • To describe a comprehensive method for fluorescently labeling lectins.
  • To outline the procedure for conducting lectin binding inhibition experiments on glycan microarrays.
  • To demonstrate the calculation of IC50 values for lectin binding inhibitors using GraphPad Prism software.

Main Methods:

  • Fluorescent labeling of lectins for enhanced detection.
  • Glycan microarray assay to measure lectin binding.
  • Inhibition experiments using known carbohydrate inhibitors.
  • Data analysis and IC50 calculation using GraphPad Prism.

Main Results:

  • Successful fluorescent labeling of Maackia amurensis agglutinin (MAA).
  • Demonstration of MAA binding to 3'sialyl-N-acetyllactosamine (3SLN) on a glycan microarray.
  • Quantification of lactose's inhibitory effect on MAA binding to 3SLN, yielding an IC50 value.

Conclusions:

  • The described method provides a robust platform for IC50 determination of lectin-carbohydrate interactions.
  • This approach facilitates the comparison of various carbohydrate inhibitors' efficiencies.
  • The protocol is applicable to diverse lectin-ligand systems and inhibitor molecules.