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Non-Covalent Spin-Labeling of RNA With Short Hairpins Containing the Rigid Spin Label Çm.

Iram M Ahmad1, Burkhard Endeward2, Thomas F Prisner2

  • 1Department of Chemistry, Science Institute, University of Iceland, Reykjavik, Iceland.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 26, 2025
PubMed
Summary

Researchers developed a novel method for labeling nucleic acids using rigid spin labels and noncovalent hairpin assembly. This technique simplifies the structural analysis of RNA and RNA-protein complexes using Electron Paramagnetic Resonance (EPR) spectroscopy.

Keywords:
DEEREPR spectroscopyPELDORnucleic acidsspin labeling

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Spectroscopy

Background:

  • Nucleic acid structure and dynamics are crucial for biological function.
  • Electron Paramagnetic Resonance (EPR) spectroscopy is a powerful tool for studying nucleic acids.
  • Incorporating rigid spin labels into nucleic acids for EPR analysis is challenging.

Purpose of the Study:

  • To develop a noncovalent strategy for incorporating rigid spin labels into oligonucleotides.
  • To enable precise structural studies of RNA and RNA-protein complexes using EPR.

Main Methods:

  • Synthesis of a rigid spin label (Çm) incorporated into an RNA hairpin.
  • Noncovalent labeling of various oligonucleotides via helical stacking of the hairpin.
  • Analysis using continuous wave (CW) and pulsed dipolar EPR spectroscopy, including pulsed electron-electron double resonance (PELDOR/DEER).

Main Results:

  • Demonstrated efficient helical stacking between spin-labeled RNA hairpins and RNA duplexes using short complementary overhangs.
  • Validated the utility of the noncovalent labeling strategy for structural investigations.
  • Showcased the potential for high-precision distance measurements and orientation information.

Conclusions:

  • The developed noncovalent hairpin labeling strategy simplifies the incorporation of rigid spin labels for EPR studies.
  • This method facilitates structural analysis of larger RNA molecules and RNA-protein complexes.
  • Opens new avenues for advanced biophysical characterization of nucleic acid structures and dynamics.