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Mapping RNA-protein interactions with subcellular resolution using colocalization CLIP.

Soon Yi1,2, Shashi S Singh1,2, Kathryn Rozen-Gagnon3

  • 1Center for RNA Science and Therapeutics, School of Medicine, Case Western Reserve University, Cleveland, Ohio 44106, USA.

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Summary
This summary is machine-generated.

This study introduces colocalization CLIP (coCLIP), a new method to map RNA-binding protein (RBP) interactions with RNA in specific cellular locations. coCLIP reveals how HuR protein

Keywords:
HuR/ELAVL1RNA localizationRNA-binding proteinscross-linking and immunoprecipitation (CLIP)proximity labelingstress granules

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • RNA-binding proteins (RBPs) are crucial for RNA metabolism, influencing cellular functions and disease states.
  • Understanding the subcellular localization of RBP-RNA interactions is vital but remains largely unexplored.
  • Existing methods lack the resolution to capture location-specific RBP-RNA networks.

Purpose of the Study:

  • To develop and validate a novel method, colocalization CLIP (coCLIP), for mapping RBP-RNA interactions within specific subcellular compartments.
  • To investigate the dynamic and location-dependent RNA interactions of the RBP human antigen R (HuR).
  • To uncover the unique binding preferences of HuR within stress granules (SGs) under cellular stress.

Main Methods:

  • Development of colocalization CLIP (coCLIP), integrating cross-linking and immunoprecipitation (CLIP) with proximity labeling.
  • Application of coCLIP to study the human antigen R (HuR) RBP in different subcellular locations (nucleus, cytosol, SGs).
  • Analysis of HuR's sequence preferences and interaction profiles across distinct cellular compartments.

Main Results:

  • coCLIP successfully revealed dynamic and location-specific RNA interactions of HuR.
  • Significant alterations in HuR's sequence preferences and binding partners were observed in the nucleus, cytosol, and SGs.
  • Unique binding preferences of HuR within SGs during arsenite-induced stress were identified, offering insights not achievable with conventional methods.

Conclusions:

  • coCLIP is a powerful technique for dissecting RBP-RNA interactions based on subcellular localization.
  • HuR exhibits distinct interaction profiles depending on its cellular location, particularly within SGs under stress.
  • This study provides a foundation for advanced RBP models that integrate subcellular location as a key determinant of function.