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Related Experiment Video

Updated: Jan 27, 2026

Novel RNA-Binding Proteins Isolation by the RaPID Methodology
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Mapping RNA-Binding Proteins on the Ribosome by Tethered Micrococcal Nuclease.

Chia Yi Yao1, Simpson Joseph1

  • 1Department of Chemistry and Biochemistry, University of California at San Diego, 9500 Gilman Drive, La Jolla, California 92093-0314, United States.

Biochemistry
|January 26, 2026
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Summary

We developed a new method, Tethered Micrococcal Nuclease Mapping (TM-map), to visualize RNA-binding protein interactions. This technique accurately maps protein-RNA binding sites, revealing insights into Fragile X Mental Retardation Protein

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • RNA-binding proteins (RBPs) regulate gene expression post-transcriptionally.
  • Understanding RBP binding sites on RNA is crucial for RNP complex assembly.
  • Existing methods for mapping RBP-RNA interactions have limitations like low signal-to-noise and variable efficiency.

Purpose of the Study:

  • To develop a novel sequencing-based strategy for determining RBP binding sites on RNA in vitro.
  • To address limitations of current methods for mapping RBP-RNA interactions.
  • To investigate the ribosome interaction site of Drosophila Fragile X Mental Retardation Protein (FMRP).

Main Methods:

  • Developed Tethered Micrococcal Nuclease Mapping (TM-map), a method fusing RBPs to micrococcal nuclease (MNase).
  • Upon Ca2+ activation, tethered MNase cleaves proximal RNA, with 3' termini indicating spatial proximity.
  • Validated TM-map using MS2 coat protein on the E. coli ribosome and applied it to Drosophila FMRP.

Main Results:

  • TM-map successfully mapped cleavage sites proximal to the MS2 coat protein stem-loop on the ribosome.
  • TM-map revealed reproducible cleavage clusters on 18S rRNA for both N- and C-terminal MNase-FMRP fusions.
  • Results suggest FMRP exhibits flexible termini and dynamic interaction with the ribosome.

Conclusions:

  • TM-map is a reliable, sequencing-based method for mapping RBP-RNA interactions in vitro.
  • The technique provides a simple, proximity-based approach for visualizing interactions within RNP assemblies.
  • TM-map offers a generalizable strategy for studying diverse RBP-RNA binding characteristics.