Endowing RNase H-inactive antisense with catalytic activity: 2-5A-morphants

Area of Science:

• Medicinal Chemistry
• Oligonucleotide Synthesis
• Molecular Biology

Background:

• 2′,5′-oligoadenylate (2-5A) is a key mediator of the interferon-induced antiviral state.
• Phosphorodiamidate morpholino oligomers (morphants) are synthetic nucleic acid analogs with potential therapeutic applications.
• Conjugating 2-5A to morphants could create novel RNA-targeting agents.

Purpose of the Study:

• To develop a synthetic route for conjugating 2-5A to morphants.
• To synthesize and characterize a 2-5A-morphant chimera.
• To evaluate the biological activity of the novel chimera in RNase L assays.

Main Methods:

• Adapted solid-phase synthesis synthons for large-scale solution synthesis of 2-5A tetramer.
• Utilized phosphoramidite chemistry for chain elongation and functionalization.
• Synthesized the 2-5A-morphant chimera via covalent linkage and reductive amination.
• Assessed biological activity using RNase L assays.

Main Results:

• Successfully synthesized the 2-5A tetramer using adapted solution-phase methods.
• Created a novel 2-5A-morphant chimera by covalently linking the components.
• The resulting chimera exhibited significant biological activity in RNase L assays.
• Demonstrated the potential of this chimera as a tool for RNA ablation.

Conclusions:

• A robust synthetic strategy for 2-5A-morphant conjugates was established.
• The novel 2-5A-morphant chimera possesses potent RNA-targeting capabilities.
• This conjugate represents a promising new avenue for developing RNA ablation therapeutics.