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Proximity labeling to detect RNA-protein interactions in live cells
1Department of Biomedical Sciences, College of Veterinary Medicine and Life Sciences, City University of Hong Kong, Kowloon Tong, Hong Kong.
FEBS Open Bio
|July 28, 2019
Summary
We developed RNA-bound protein proximity labeling (RBPL), a new method to detect RNA-protein interactions. RBPL using λN-BASU offers high signal-to-noise ratios and is superior for live-cell RNA-protein interaction studies.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- RNA-protein interactions are crucial for cellular processes.
- Existing methods for studying these interactions have limitations.
Purpose of the Study:
- To develop and optimize a novel proximity-dependent protein labeling method for detecting RNA-protein interactions.
- To compare the efficacy of different proximity labeling enzymes and systems.
Main Methods:
- RNA-bound protein proximity labeling (RBPL) was developed using proximity labeling enzymes.
- The method was tested using the well-characterized RNA-binding protein PUF.
- Optimization involved using a new birA* variant (BASU) and an inducible expression system.
Main Results:
- RBPL successfully detected RNA-protein interactions with the PUF protein.
- The RBPL system using λN-BASU demonstrated high signal-to-noise ratios.
- RBPL (λN-BASU) proved more effective than RBPL (λN-APEX2) in live cells.
- Proximity labeling may also biotinylate nascent peptides.
Conclusions:
- RBPL is a powerful new tool for studying RNA-protein interactions in live cells.
- The λN-BASU enzyme offers improved performance for RBPL.
- Further investigation into proximity labeling's capabilities is warranted.
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