miRNA inhibition by proximity-enabled Dicer inactivation

Area of Science:

• Molecular Biology
• Biochemistry
• Drug Discovery

Background:

• MicroRNAs (miRNAs) are key regulators of biological processes, and their dysregulation is linked to various human diseases.
• Targeting miRNAs for therapeutic purposes is a significant research area, with small molecule inhibitors showing promise due to favorable pharmacological properties.
• Directly targeting and inhibiting miRNAs with small molecules remains challenging due to difficulties in RNA targeting.

Purpose of the Study:

• To outline a workflow for generating bifunctional small molecule inhibitors that block miRNA biogenesis.
• To develop a novel strategy for inhibiting Dicer, an enzyme essential for miRNA processing.

Main Methods:

• Conjugation of a weak Dicer inhibitor with a specific precursor miRNA (pre-miRNA) binder.
• Proximity-enabled inactivation of Dicer at the pre-miRNA processing site.
• Development of a protocol applicable to various miRNAs.

Main Results:

• Demonstrated a method to create bifunctional small molecules that inhibit Dicer activity.
• Successfully delivered Dicer inhibitors to the targeted pre-miRNA processing site.
• Achieved inhibition of Dicer-mediated pre-miRNA processing.

Conclusions:

• The developed protocol provides a viable strategy for engineering bifunctional small molecule inhibitors.
• This approach enables targeted inhibition of miRNA biogenesis by inactivating Dicer.
• The method is adaptable for creating inhibitors against different miRNAs, offering broad therapeutic potential.