A mild and efficient solid-support synthesis of novel oligonucleotide conjugates

Area of Science:

• Chemical Synthesis
• Oligonucleotide Chemistry
• Bioconjugation

Background:

• Oligodeoxyribonucleotide phosphorothioate (ODN-PS) modifications are crucial for enhancing therapeutic properties.
• Conjugation of ODN-PS with specific ligands can improve targeting and delivery.
• Developing efficient synthesis methods for modified oligonucleotides is essential for their clinical translation.

Purpose of the Study:

• To synthesize novel conjugates of ODN-PS with folic acid, retinoic acid, arachidonic acid, and methoxypoly(ethylene glycol)propionic acid.
• To establish a robust and efficient method for preparing these ODN-PS conjugates.
• To confirm the identity and integrity of the synthesized oligonucleotide conjugates.

Main Methods:

• Solid-phase synthesis of 5'-amino-functionalized ODN-PS using N-pent-4-enoyl-derived nucleoside phosphoramidites.
• Conjugation of ODN-PS to ligand acids using 1-[3-(dimethylamino)propyl]-3-ethylcarbodiimide or their succinimidyl derivatives.
• Deprotection, purification via reversed-phase HPLC or polyacrylamide gel electrophoresis, and characterization by MALDI-TOF mass spectrometry.

Main Results:

• Successful synthesis of ODN-PS conjugates with folic acid, retinoic acid, arachidonic acid, and methoxypoly(ethylene glycol)propionic acid.
• Demonstrated efficient conjugation strategies for creating modified oligonucleotides.
• Confirmed the successful synthesis and deprotection of the ODN conjugates through mass spectral analysis.

Conclusions:

• A reliable method for synthesizing ODN-PS conjugates with diverse ligands has been developed.
• The synthesized conjugates are well-characterized and suitable for further investigation.
• These modified oligonucleotides hold promise for advanced therapeutic applications.