TurboID-Based Proximity Labeling for In Planta Identification of Protein-Protein Interaction Networks
May 17th, 2020
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Described here is a proximity labeling method for identification of interaction partners of the TIR domain of the NLR immune receptor in Nicotiana benthamiana leaf tissue. Also provided is a detailed protocol for the identification of interactions between other proteins of interest using this technique in Nicotiana and other plant species.
Overview
This article describes a TurboID-based proximity labeling method for identifying interaction partners of NLR immune receptors in Nicotiana benthamiana. The protocol can be adapted for studying protein-protein interactions in various plant species.
Key Study Components
Area of Science
- Plant Immunology
- Protein-Protein Interactions
- Biotechnology
Background
- NLR immune receptors are vital for plant defense against pathogens.
- Understanding protein interactions is crucial for elucidating immune responses.
- Traditional methods may not capture transient or weak interactions.
- TurboID offers a novel approach for in vivo studies.
Purpose of Study
- To develop a method for identifying interaction partners of NLR receptors.
- To provide a protocol applicable to other proteins in Nicotiana and beyond.
- To enhance understanding of plant immune mechanisms.
Methods Used
- TurboID-based proximity labeling technique.
- Growth of Nicotiana benthamiana plants in controlled conditions.
- Identification of protein interactions in vivo.
- Adaptation of the method for various proteins of interest.
Main Results
- Successful identification of interaction partners for NLR receptors.
- Demonstration of the method's applicability to other proteins.
- Evidence of capturing transient interactions.
- Protocol serves as a reference for future studies.
Conclusions
- The TurboID method is a valuable tool for studying protein interactions in plants.
- This approach can advance research in plant immunity.
- Further applications may extend to other species and proteins.
Frequently Asked Questions
What is the TurboID method?
TurboID is a proximity labeling technique used to identify protein interactions in living cells.
Why is studying NLR receptors important?
NLR receptors play a crucial role in plant defense against pathogens, making them key targets for research.
Can this method be used for other plant species?
Yes, the protocol can be adapted for various proteins in different plant species.
What are the advantages of the TurboID method?
It captures transient and weak protein-protein interactions that traditional methods may miss.
How are Nicotiana benthamiana plants grown for this study?
They are grown in wet soil at high density in a climate chamber with specific light and temperature conditions.
What is the significance of protein-protein interactions in plants?
Understanding these interactions helps elucidate the mechanisms of plant immunity and response to stress.
Executive Industry Relevance
TurboID-based proximity labeling enables rapid, room-temperature identification of protein-protein interactions in plants, addressing key limitations of traditional methods that require toxic reagents, prolonged incubation, or elevated temperatures. This approach supports target validation and mechanistic de-risking in plant immunity research by capturing transient or weak interactions that are often missed by conventional assays. The method enhances predictive confidence in early discovery stages and provides a scalable, reusable platform for studying NLR immune receptors and other proteins of interest across plant species.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Scientific Value: Enables interrogation of therapeutic hypotheses by mapping protein interaction networks of NLR immune receptors in planta.
- Operational Value: Facilitates biological de-risking through rapid, room-temperature labeling that preserves labile interactions.
- Scientific Value: Supports target confidence by identifying proximal proteins under near-physiological conditions without toxic hydrogen peroxide.
Screening & Assay Development
- Scientific Value: Generates quantitative, enrichment-dependent readouts via streptavidin affinity purification for downstream mass spectrometry.
- Operational Value: Delivers assay-ready samples in under 12 hours post-biotin treatment, enabling high-throughput screening readiness.
- Operational Value: Ensures reproducibility through standardized desalting, bead-based enrichment, and stringent wash steps.
Translational & Preclinical Research
- Scientific Value: Provides disease-relevant system insights by linking NLR interactors to immune response pathways in Nicotiana benthamiana.
- Operational Value: Enables translational continuity from discovery to preclinical validation through adaptable protocols across plant species.
- Scientific Value: Supports mechanistic de-risking by distinguishing stable from transient interactions via temporal biotin pulse labeling.
Pipeline & Workflow Integration
The TurboID proximity labeling method fits within the early discovery continuum, supporting hypothesis testing and pathway clarification prior to lead identification efforts in plant-based biopharma research.
- Discovery Biology: Tests biological hypotheses by identifying proximal proteins to NLR TIR domains in vivo.
- Screening: Produces quantitative biotinylation readouts that enable comparison of interaction strength across conditions.
- Analytics: Generates mass spectrometry-compatible samples for quantitative interaction profiling.
- Translational Research: Connects molecular interactions to immune phenotypes in a disease-relevant plant model.
- Enterprise Reuse: Offers a plug-and-play platform adaptable to any protein of interest in Nicotiana and related species.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence by capturing weak and transient interactions missed by co-immunoprecipitation.
- Operational Value: Reduces assay time from 16–24 hours (BioID) to 10 minutes labeling plus short incubation.
- Strategic Value: Improves go/no-go decisions by providing early, reliable interaction data for target prioritization.
- Portfolio Impact: Enables risk-adjusted advancement through mechanistically validated interaction networks.
Implementation Considerations
- Requires expertise in molecular cloning, agroinfiltration, and plant protein extraction.
- Needs access to centrifuges, magnetic racks, and streptavidin-conjugated beads for enrichment.
- Demands standardization of biotin concentration, incubation time, and wash protocols across labs.
- Requires adaptation of lysis and buffer conditions for different plant species or subcellular compartments.
- Limited by endogenous biotin levels in certain plant tissues, necessitating background controls.
Biopharma FAQs
Why does TurboID labeling time matter for target validation?
The 10-minute labeling window enables capture of transient protein-protein interactions that longer incubation methods may miss, improving target confidence in early discovery.
How does biotin concentration affect interaction network identification?
Using 200 micromolar biotin ensures efficient labeling of proximal proteins while minimizing nonspecific background, supporting reliable interaction mapping.
What does streptavidin bead enrichment enable for downstream analysis?
Affinity purification of biotinylated proteins allows specific enrichment for mass spectrometry, enabling quantitative identification of interaction partners.
Why are replication requirements important for cross-functional collaboration?
Repeating the protocol across biological replicates ensures reproducibility of interaction data, which is essential for consistent interpretation between discovery and preclinical teams.
What statistical analysis is needed before implementing TurboID in a screening pipeline?
Normalization of biotinylation signals against controls and statistical enrichment scoring are required to distinguish specific interactions from noise before assay deployment.
