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Related Experiment Videos

Gaining target access for deoxyribozymes.

Steffen Schubert1, Jens P Fürste, Denise Werk

  • 1Institute for Chemistry (Biochemistry), Free University Berlin, Thielallee 63, D-14195 Berlin, Germany.

Journal of Molecular Biology
|May 12, 2004
PubMed
Summary

Modified nucleotides enhance DNAzyme efficiency by overcoming RNA structural barriers, enabling gene regulation for previously inaccessible viral targets. This strategy improves DNAzyme activity against complex RNA structures.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • RNA Therapeutics

Background:

  • Gene expression regulation often targets messenger RNAs (mRNAs) using antisense oligonucleotides and ribozymes.
  • Internal structures of long RNAs limit accessibility for classical ribozymes and DNAzymes, hindering cleavage efficiency.
  • Up to 90% of potential cleavage sites on target RNAs remain inaccessible to existing RNA-based catalytic molecules.

Purpose of the Study:

  • To develop modified nucleotides that overcome internal RNA structural barriers for improved DNAzyme-mediated gene regulation.
  • To enhance the catalytic activity of DNAzymes against previously inaccessible viral RNA sequences.
  • To demonstrate the broad applicability of modified nucleotides in improving DNAzyme efficacy.

Main Methods:

Related Experiment Videos

  • Generation of a DNAzyme targeting a conserved sequence in the 5' untranslated region (5' UTR) of picornavirus RNAs.
  • Incorporation of 2'-O-methyl RNA or locked nucleic acid (LNA) monomers into DNAzyme substrate recognition arms.
  • Testing modified DNAzyme activity against human rhinovirus 14 and coxsackievirus A21 (CAV-21) RNAs.

    • Main Results:

    • A DNAzyme initially ineffective against CAV-21 RNA became highly efficient after modification with 2'-O-methyl RNA or LNA monomers.
    • Modified DNAzymes demonstrated high catalytic rates, degrading target RNAs even to completion.
    • The strategy successfully improved the activity of previously inactive DNAzymes against their target RNA structures.

    Conclusions:

    • Modified nucleotides with high target affinity can successfully compete with internal RNA structures, overcoming accessibility barriers.
    • This approach offers a viable strategy for enhancing ribozyme and DNAzyme activity against challenging RNA targets.
    • The findings have implications for developing novel RNA-targeting therapeutics and gene regulation tools.