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Evolution of a phosphorothioate RNA library during in vitro selection
1Department of Chemistry, Faculty of Science, Konan University, Kobe, Japan.
Nucleic Acids Symposium Series
|January 1, 1997
Summary
Modified RNA aptamers with phosphorothioate linkages demonstrated improved binding to target proteins. This thio-RNA approach offers a promising strategy for developing superior nucleic acid-based therapeutics.
Area of Science:
- Biochemistry
- Molecular Biology
- Drug Discovery
Background:
- Nucleic acid aptamers are therapeutic molecules selected for high affinity and specificity.
- Natural RNA aptamers face challenges like nuclease degradation and suboptimal binding kinetics.
Purpose of the Study:
- To investigate the utility of phosphorothioate linkages in RNA aptamers for enhanced therapeutic properties.
- To compare the binding affinity of thio-RNA aptamers against natural RNA aptamers.
Main Methods:
- In vitro selection was performed using an RNA library incorporating phosphorothioate linkages (thio-RNA).
- Dissociation rate constant (kd) was measured to assess binding kinetics to a target protein.
Main Results:
- The thio-RNA library exhibited a significantly smaller dissociation rate constant (kd) compared to the natural RNA library.
- This indicates enhanced binding affinity and stability of thio-RNA aptamers.
Conclusions:
- Phosphorothioate linkages improve the binding characteristics of RNA aptamers.
- The thio-RNA selection strategy presents a viable method for developing advanced nucleic acid drugs with improved therapeutic potential.