Efficient solid-phase synthesis of pppRNA by using product-specific labeling.

Area of Science:

• Organic Chemistry
• Molecular Biology
• Immunology

Background:

• 5 -triphosphate oligonucleotides are crucial for activating the cytosolic immune sensor RIG-I.
• Current synthesis methods for these molecules can be inefficient.
• Developing improved synthesis strategies is vital for advancing therapeutic applications.

Purpose of the Study:

• To report a novel solid-phase synthesis and purification strategy for 5 -triphosphate oligonucleotides.
• To enable efficient production of 5 -triphosphorylated RNA derivatives and analogues.
• To facilitate the development of therapeutic approaches utilizing 5 -triphosphate oligonucleotides.

Main Methods:

• Utilized a lipophilic tagging strategy for the triphosphate moiety.
• Employed 5 -O-cyclotriphosphate intermediates for triphosphate synthesis.
• Introduced a lipophilic tag (e.g., decylamine) during ring-opening to create gamma-phosphate-tagged species.

Main Results:

• Achieved highly efficient synthesis of 5 -triphosphorylated RNA derivatives.
• Successfully synthesized gamma-phosphate-substituted analogues.
• Established a robust solid-phase strategy for purification.

Conclusions:

• The novel lipophilic tagging method provides an efficient route to 5 -triphosphate oligonucleotides.
• This advancement supports the use of these oligonucleotides as potent RIG-I activators.
• The strategy holds significant promise for developing new immunotherapies.