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Updated: Jul 6, 2025
10:53
Isolation of Cognate RNA-protein Complexes from Cells Using Oligonucleotide-directed Elution
Published on: January 16, 2017
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A new small molecule DoNA binding to CAG repeat RNA.
Qingwen Chen1, Takeshi Yamada2, Koichi Miyagawa3
1SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1 Mihogaoka, Ibaraki 567-0047, Japan.
Bioorganic & Medicinal Chemistry
|January 9, 2024
Summary
A new molecule, DoNA, binds strongly to CAG repeat RNA, unlike its predecessor NA. DoNA targets specific CAG RNA structures, offering potential for new therapeutic strategies.
Area of Science:
- Molecular Biology
- Biochemistry
- RNA Therapeutics
Background:
- The molecule NA exhibits high affinity for CAG repeat DNA but not CAG repeat RNA.
- CAG repeat sequences are implicated in various neurological disorders.
Purpose of the Study:
- To investigate the binding capabilities of DoNA, a dimer of NA, to CAG repeat RNA.
- To characterize the specific binding sites and affinity of DoNA on CAG repeat RNA.
Main Methods:
- Surface Plasmon Resonance (SPR) for binding affinity analysis.
- Capillary Electrophoresis-Mass Spectrometry (CE-MS) for detailed binding characterization.
- Hairpin RNA models to investigate RNA motif interactions.
Main Results:
- DoNA demonstrates significantly increased binding affinity to single-stranded CAG repeat RNA compared to NA.
- DoNA selectively binds to CAG units at overhang and terminal positions.
- DoNA also binds to structurally flexible internal and hairpin loop regions of CAG repeat RNA.
Conclusions:
- DoNA represents a novel molecule with enhanced affinity for CAG repeat RNA.
- DoNA's specific binding to CAG RNA motifs suggests potential applications in targeting RNA structures.
- This finding opens avenues for developing new therapeutic agents for diseases associated with CAG repeat expansions.
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