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RNA cleaving '10-23' DNAzymes with enhanced stability and activity
Steffen Schubert1, Deniz C Gül, Hans-Peter Grunert
1Free University Berlin, Institute of Chemistry (Biochemistry), Thielallee 63, D-14195 Berlin, Germany.
Nucleic Acids Research
|October 8, 2003
Summary
Optimized DNAzymes offer enhanced RNA cleavage for in vivo applications. Modifications improve stability and activity against viral targets, paving the way for new therapeutic strategies.
Area of Science:
- Molecular Biology
- Biochemistry
- Antiviral Therapeutics
Background:
- DNAzymes are catalytic DNA molecules capable of sequence-specific RNA cleavage.
- In vivo applications require DNAzymes to be stabilized against nucleolytic degradation.
- Human rhinovirus 14 is a common cold virus, and its 5'-non-translated region is a potential therapeutic target.
Purpose of the Study:
- To optimize the design of DNAzymes targeting human rhinovirus 14 for improved kinetic properties and nuclease stability.
- To investigate the impact of various modified nucleotides and structural modifications on DNAzyme performance.
- To establish a generalizable design strategy for nuclease-resistant and highly active DNAzymes.
Main Methods:
- Systematic comparison of DNAzymes with different stabilizing modifications (e.g., 3'-3'-inverted thymidine, phosphorothioate linkages, 2'-O-methyl RNA, locked nucleic acids).
- Optimization of DNAzyme arm length and the content of modified nucleotides in binding arms and catalytic core.
- Assessment of cleavage activity and stability against nucleolytic degradation using biochemical assays.
Main Results:
- Significant enhancement of both cleavage activity and nuclease stability through optimization of arm length and modified nucleotide content.
- Introduction of modified nucleotides into the catalytic core further improved stability against endonucleolytic degradation without compromising catalytic activity.
- Developed DNAzyme designs exhibited up to 10-fold enhanced activity and significantly elevated stability against nucleolytic cleavage.
- The established design strategy proved adaptable to different target sequences with only minor modifications needed to maintain activity.
Conclusions:
- Optimized DNAzyme designs incorporating nucleotide modifications in both binding arms and the catalytic core significantly enhance RNA cleavage activity and nuclease resistance.
- This study provides a robust design framework for developing highly effective and stable DNAzymes for potential therapeutic applications.
- The findings suggest broad applicability of this design strategy for targeting various RNA sequences, including those from other viruses.