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Tag-Based Pull-Down Assay.

Shanwu Lyu^1,2, Changwei Zhang², Xilin Hou²

¹London Research and Development Centre, Agriculture and Agri-Food Canada, London, ON, Canada.

Methods in Molecular Biology (Clifton, N.J.)

|December 14, 2021

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This study details a tag-based pull-down assay protocol for identifying plant virus-host protein interactions. This method helps understand viral infection mechanisms and develop new antiviral strategies.

Area of Science:

Molecular Biology
Plant Virology
Biochemistry

Background:

Protein-protein interactions are vital for biological processes, including viral infection.
Understanding virus-host interactions is key to developing antiviral technologies.
The pull-down assay is a common method for studying these interactions.

Purpose of the Study:

To describe a practical protocol for tag-based pull-down assays in plant virology.
To provide solutions for common challenges encountered during the assay.
To facilitate the study of virus-host protein interactions.

Main Methods:

Expression of tagged viral proteins (bait) in model plants like Nicotiana benthamiana.
Purification of bait proteins using affinity resins (e.g., glutathione or cobalt chelate).

Keywords:

Agroinfiltration Immunoblot Mass spectrometry Protein–protein interaction Transient expression Virus-plant interaction

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Analysis of purified protein complexes via mass spectrometry or immunoblotting.

Main Results:

The chapter provides a detailed protocol for conducting tag-based pull-down assays.
Common problems and their solutions are discussed to optimize the assay.
The described method enables the discovery of novel virus-host protein interactions.

Conclusions:

Tag-based pull-down assays are effective for identifying plant virus-host protein interactions.
This method advances understanding of viral infection at the molecular level.
The protocol aids in the development of novel antiviral strategies.