Abstract
Proteins form complex networks through interaction to drive biological processes. Thus, dissecting protein–protein interactions (PPIs) is essential for interpreting cellular processes. To overcome the drawbacks of traditional approaches for analyzing PPIs, enzyme-catalyzed proximity labeling (PL) techniques based on peroxidases or biotin ligases have been developed and successfully utilized in mammalian systems. However, the use of toxic H2O2 in peroxidase-based PL, the requirement of long incubation time (16–24 h), and higher incubation temperature (37 °C) with biotin in BioID-based PL significantly restricted their applications in plants. TurboID-based PL, a recently developed approach, circumvents the limitations of these methods by providing rapid PL of proteins under room temperature. We recently optimized the use of TurboID-based PL in plants and demonstrated that it performs better than BioID in labeling endogenous proteins. Here, we describe a step-by-step protocol for TurboID-based PL in studying PPIs in planta, including Agrobacterium-based transient expression of proteins, biotin treatment, protein extraction, removal of free biotin, quantification, and enrichment of the biotinylated proteins by affinity purification. We describe the PL using plant viral immune receptor N, which belongs to the nucleotide-binding leucine-rich repeat (NLR) class of immune receptors, as a model. The method described could be easily adapted to study PPI networks of other proteins in Nicotiana benthamiana and provides valuable information for future application of TurboID-based PL in other plant species.
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Acknowledgments
This work was supported by grants from NIH-GM132582, NSF-MCB-EAGER-2028283 and NSF-IOS-2139987 to SPD-K.
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Li, Y., Zhang, Y., Dinesh-Kumar, S.P. (2024). TurboID-Based Proximity Labeling: A Method to Decipher Protein–Protein Interactions in Plants. In: Fontes, E.P., Mäkinen, K. (eds) Plant-Virus Interactions. Methods in Molecular Biology, vol 2724. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-3485-1_19
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DOI: https://doi.org/10.1007/978-1-0716-3485-1_19
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