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Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
Published on: September 21, 2017
Recognition of RNA duplexes by chemically modified triplex-forming oligonucleotides
Yuan Zhou1, Elzbieta Kierzek, Zi Ping Loo
1Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore.
Nucleic Acids Research
|May 10, 2013
Summary
Chemical modifications in triplex-forming oligonucleotides (TFOs) significantly impact RNA triplex stability. Locked nucleic acid and 2-thio U modifications enhance stability, while 2′-O methyl modifications show varied effects, aiding in designing RNA-targeting agents.
Area of Science:
- Molecular Biology
- Biochemistry
- RNA Structure
Background:
- RNA triplexes are crucial tertiary structures involved in various biological processes.
- Understanding chemical modifications' effects on triplex stability is vital for therapeutic applications.
- Triplex-forming oligonucleotides (TFOs) offer potential for regulating RNA functions.
Purpose of the Study:
- To investigate how chemical modifications in TFOs influence RNA triplex stability.
- To explore the binding of modified TFOs to RNA hairpin structures.
- To elucidate the molecular mechanisms behind TFO-mediated triplex stabilization/destabilization.
Main Methods:
- Incorporation of locked nucleic acid, 2-thio U, and 2'-O methyl modifications into pyrimidine RNA TFOs.
- Formation of 12-base-triple major-groove pyrimidine-purine-pyrimidine triplexes with RNA/DNA hairpins.
- Ultraviolet-absorbance-detected thermal melting studies to assess triplex stability.
Main Results:
- Locked nucleic acid and 2-thio U modifications significantly enhanced triplex formation with both RNA and DNA duplex regions.
- 2'-O methyl modifications destabilized triplexes with RNA but stabilized them with DNA duplex regions.
- Observed (de)stabilization effects are attributed to modulation of van der Waals contacts, base stacking, hydrogen bonding, and other molecular interactions.
Conclusions:
- Chemical modifications in TFOs can be strategically employed to modulate RNA triplex stability.
- This study provides a foundation for designing novel sequence-specific ligands targeting RNA for diagnostic and therapeutic purposes.
- Understanding the molecular determinants of RNA triplex stability is key for developing effective RNA-based therapeutics.
