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Photoactivatable RNA Tags for Subcellular Photolabeling of RNA.

Zhenyin Chen1,2,3,4, Haodong Jiang1,3, Lin Yuan5

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Researchers developed PA-Broccoli, a novel photoactivatable RNA tag. This tool enables real-time tracking of RNA dynamics within cells, revealing new insights into RNA transport and localization.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Photoactivatable fluorescent proteins (PA-FPs) allow precise tracking of protein dynamics.
  • A similar method for photoactivated tagging of subcellular RNA is currently unavailable.

Purpose of the Study:

  • To develop a photoactivatable fluorescent RNA tag, named PA-Broccoli.
  • To utilize PA-Broccoli for live-cell RNA tracking and investigate RNA dynamics.

Main Methods:

  • Development of PA-Broccoli, a photoactivatable RNA tag mimicking PA-GFP.
  • Utilizing PA-Broccoli for live-cell imaging and analysis of RNA mobility and localization.
  • Investigating Ran-GTP-dependent nuclear export of circular RNAs and mRNA dynamics in stress granules.

Main Results:

  • PA-Broccoli exhibits a 6000-fold fluorescence enhancement with rapid activation (t1/2 = ~3 s), outperforming PA-GFP.
  • Cytoplasmic RNAs show restricted mobility compared to proteins.
  • Circular RNAs undergo Ran-GTP-dependent nuclear export, and mRNA exchange in stress granules is energy-dependent.

Conclusions:

  • PA-Broccoli is a powerful new tool for live-cell RNA tracking.
  • The study provides unprecedented insights into RNA dynamics, nuclear export, and intracellular transport mechanisms.