Cleaving Folded RNA by Multifunctional DNAzyme Nanomachines

Area of Science:

• Biotechnology
• Molecular Biology
• Nanotechnology

Background:

• Gene silencing via oligonucleotide therapy requires tight and specific binding to folded mRNA.
• Conventional probes face an affinity/specificity dilemma, limiting their effectiveness.
• Developing agents that can overcome this challenge is crucial for advanced gene therapy.

Purpose of the Study:

• To address the affinity/specificity dilemma in targeting folded RNA for gene therapy.
• To develop and evaluate multicomponent agents, termed DNA nanomachines (DNMs), for enhanced RNA binding and cleavage.
• To improve the catalytic efficiency of DNAzymes through novel structural designs.

Main Methods:

• Design and synthesis of multicomponent DNA nanomachines (DNMs) with multiple RNA-binding arms.
• Characterization of DNM binding affinity and sequence selectivity towards folded RNA targets.
• Assay of DNAzyme catalytic efficiency (kcat/Km) using DNM constructs.

Main Results:

• DNMs demonstrated tight and highly selective binding to folded RNA targets.
• DNMs improved DNAzyme catalytic efficiency by up to 3-fold compared to conventional probes.
• The enhanced efficiency was attributed to improved RNA substrate binding and product release.

Conclusions:

• Multicomponent probes organized in sophisticated structures, like DNMs, can balance affinity and selectivity for folded RNA recognition.
• DNA nanomachines offer a promising foundation for applying DNA nanotechnology in gene therapy.
• This approach advances the development of effective oligonucleotide-based gene silencing agents.