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Published on: June 25, 2014
Property Characterization of Leucine-Integrated Oligonucleotide
Yang Sun1, Yichen Huang1, Cai Yang1,2,3
1Institute of Molecular Medicine (IMM), Shanghai Key Laboratory for Nucleic Acid Chemistry and Nanomedicine, State Key Laboratory of Systems Medicine for Cancer, Department of Pharmacy, Renji Hospital, School of Medicine, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200127, China.
Researchers engineered novel oligonucleotide chimeras by incorporating leucine-mimicking elements (LEs). These modified nucleic acids show enhanced binding affinity and improved in vivo tumor targeting, advancing oligonucleotide engineering for therapeutic applications.
Area of Science:
- Oligonucleotide chemistry
- Bioconjugation
- Medicinal chemistry
Background:
- Peptide nucleic acids utilize peptide bonds in their backbone.
- Integrating amino acid R groups as nucleobase surrogates in oligonucleotides is underexplored.
- This gap presents an opportunity for novel chimera development with unique properties.
Purpose of the Study:
- To design and synthesize oligonucleotide chimeras functionalized with leucine-mimicking elements (LEs).
- To explore the properties and applications of these novel oligonucleotide-based molecules.
- To investigate the impact of LE incorporation on oligonucleotide structure, function, and therapeutic potential.
Main Methods:
- Synthesis of phosphoramidites containing isobutyl, neopentyl, and trimethylsilyl ethyl groups.
- Solid-phase synthesis of oligonucleotide chimeras (molecular beacons, aptamers, antisense oligonucleotides) with mono-, di-, and poly-LEs.
- Fluorescence assays to analyze helical structure stability and molecular beacon assembly via hydrophobic interactions.
Main Results:
- Successfully constructed oligonucleotide chimeras with varying LE incorporation.
- Demonstrated functional versatility, including improved internalization properties and enhanced target binding affinity.
- Poly-LE incorporation significantly improved the in vivo tumor-targeting efficiency of a PTK7-targeted aptamer (Sgc8c).
Conclusions:
- Oligonucleotide engineering can be advanced by incorporating protein-like hydrophobic elements.
- Leucine-mimicking elements offer a novel approach to functionalizing oligonucleotides.
- These chimeras hold promise for expanded applications in biological research and therapeutics, particularly in targeted delivery.
