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Related Experiment Video

Updated: Jun 28, 2025

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GST Pull-Down Assay to Study PIF4 Binding In Vitro.

Abhishesh Bajracharya1, Berry Dickey1, Yongjian Qiu2

  • 1Department of Biology, University of Mississippi, Oxford, MS, USA.

Methods in Molecular Biology (Clifton, N.J.)
|April 9, 2024
PubMed
Summary

Phytochrome-interacting factor 4 (PIF4) regulates plant growth with temperature changes. This guide details the GST pull-down assay to identify PIF4

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Capturing protein-protein interactions in plants: recent advances, challenges, and opportunities.

Frontiers in molecular biosciences·2026
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Oligomerization-competent PIF4 drives thermomorphogenesis through functional redundancy in transactivation and DNA binding.

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Phytochrome-interacting factor 4 (PIF4) is a key transcription factor regulating plant thermomorphogenesis.
  • Understanding PIF4's protein interactions is crucial for elucidating its role in thermal responses.
  • Investigating protein-protein interactions is vital for comprehending complex biological pathways.

Purpose of the Study:

  • To describe the GST pull-down assay for detecting protein-protein interactions with PIF4.
  • To provide a detailed protocol for identifying PIF4 interacting partners.
  • To offer guidance on data analysis for robust results.

Main Methods:

  • Utilizing the GST (glutathione-S-transferase) pull-down assay for in vitro protein interaction studies.
Keywords:
GST pull-downImmunoblotsPIF4Protein-protein interactionsThermomorphogenesis

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  • Preparation of recombinant GST-PIF4 fusion protein.
  • Detailed procedures for binding, elution, and analysis of interacting proteins.

    • Main Results:

    • The GST pull-down assay effectively detects interactions between PIF4 and other proteins.
    • The method allows for the identification of known or suspected PIF4 binding partners.
    • The protocol includes steps for reliable data interpretation and quantification.

    Conclusions:

    • The GST pull-down assay is a valuable tool for studying PIF4 protein interactions.
    • This method aids in understanding the molecular mechanisms of plant thermomorphogenesis.
    • The detailed protocol facilitates reproducible research in plant molecular biology.