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Label-Free Target Identification and Confirmation Using Thermal Stability Shift Assays.

Cecilia Rodriguez-Furlan1, Glenn R Hicks2,3

  • 1Department of Botany and Plant Sciences, Institute of Integrative Genome Biology, University of California, Riverside, CA, USA. cecilia@ucr.edu.

Methods in Molecular Biology (Clifton, N.J.)
|December 3, 2020
PubMed
Summary

Identifying protein targets in plant cells is challenging. This study introduces a label-free method using thermal shift to detect small-molecule interactions, aiding chemical genomics.

Keywords:
Label-Free Target IdentificationSmall-molecule inhibitorsTarget proteinThermal Stability Shift Assay

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Area of Science:

  • Biochemistry
  • Chemical Genomics
  • Plant Science

Background:

  • Target identification is a major hurdle in chemical genomics.
  • Existing methods for target identification and validation in plant cells have limitations.

Purpose of the Study:

  • To describe a novel, label-free method for identifying compound-target protein interactions.
  • To validate the use of thermodynamic stabilization for target engagement assays in plant systems.

Main Methods:

  • Utilized a label-free assay based on protein thermodynamic stabilization.
  • Measured the increase in the temperature of aggregation (Tagg) upon small-molecule binding.
  • Applied the method for high-throughput screening and validation of compound-target interactions.

Main Results:

  • Demonstrated that small-molecule binding enhances protein stability, increasing the Tagg.
  • Showcased the method's ability to identify specific compound-target interactions.
  • Validated the thermal shift assay for its utility in chemical genomics.

Conclusions:

  • The described thermal shift assay provides a robust, label-free approach for target identification and validation.
  • This method offers a valuable tool for advancing chemical genomic studies in plant cells.
  • The thermodynamic stabilization principle can be broadly applied to study molecular interactions.