Oligonucleotides conjugated to short lysine chains

Area of Science:

• Oligonucleotide chemistry
• Peptide synthesis
• Bioconjugation techniques

Background:

• Oligonucleotide-peptide conjugates are promising for therapeutic applications.
• Efficient and reliable synthesis methods are crucial for their development.
• Existing methods may face challenges in yield and stability.

Purpose of the Study:

• To develop a novel in-line method for synthesizing oligonucleotide-peptide conjugates.
• To create phosphorothioate oligonucleotides conjugated with peptide tails.
• To characterize the synthesized conjugates and assess their properties.

Main Methods:

• Solid-phase synthesis of a modified oligonucleotide using a succinyl linker.
• Palladium-catalyzed deprotection of the carboxyl group via phase transfer reaction.
• Inverse stepwise peptide synthesis to attach lysyl residues.
• Characterization using High-Performance Liquid Chromatography (HPLC), mass spectrometry, and circular dichroism (CD).

Main Results:

• Successful synthesis of oligonucleotide-peptide conjugates with short lysyl tails.
• Minimal influence of lysyl tails on the circular dichroism spectra of the conjugates.
• Negligible destabilizing effects on DNA duplexes upon peptide conjugation, as shown by melting profiles.

Conclusions:

• The novel in-line approach provides an efficient method for synthesizing oligonucleotide-peptide conjugates.
• The synthesized conjugates maintain structural integrity and exhibit minimal impact on duplex stability.
• This method holds potential for the development of advanced oligonucleotide-based therapeutics.