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Updated: Jun 5, 2026
09:04
Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
Published on: September 21, 2017
Oligonucleotide analogs with peptide internucleotide linkages.
Anna Varizhuk1, Svetlana Kochetkova, Natalia Kolganova
1Engelhardt Institute of Molecular Biology, Moscow, Russian Federation.
Nucleosides, Nucleotides & Nucleic Acids
|January 25, 2011
Summary
Modified oligonucleotides with D-alanine linkages show enhanced duplex stability compared to native DNA. Other amino acid modifications, however, were found to decrease duplex stability, impacting oligonucleotide research.
Area of Science:
- Biochemistry
- Molecular Biology
- Organic Chemistry
Background:
- Oligonucleotides are crucial in molecular biology and therapeutics.
- Phosphodiester backbones are susceptible to degradation.
- Modifying internucleotide linkages is a strategy to enhance stability and function.
Purpose of the Study:
- To synthesize oligonucleotide analogs with amino acid residues replacing phosphodiester linkages.
- To evaluate the impact of these modifications on duplex stability.
Main Methods:
- Synthesis of oligonucleotide analogs incorporating glycine, L-alanine, D-alanine, L-phenylalanine, and D-phenylalanine residues.
- Thermal denaturation studies (Tm analysis) to assess duplex stability of modified oligonucleotides against wild-type complements.
Main Results:
- Oligonucleotides with D-alanine in internucleotide linkages formed more stable duplexes (ΔTm +0.2 °C per modification).
- Modifications with glycine, L-alanine, L-phenylalanine, and D-phenylalanine residues destabilized the oligonucleotide duplexes compared to native structures.
Conclusions:
- D-alanine modifications represent a promising strategy for enhancing oligonucleotide duplex stability.
- Careful selection of amino acid residues is critical for maintaining or improving oligonucleotide structural integrity.
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