DNA-Polymer Conjugates by Photoinduced RAFT Polymerization

Area of Science:

• Polymer Chemistry
• Bioconjugation Chemistry
• Materials Science

Background:

• Conventional DNA-polymer conjugation methods often suffer from low yields due to steric hindrance.
• The "grafting-from" strategy offers an alternative by initiating polymerization directly from DNA-bound initiators.

Purpose of the Study:

• To develop a convenient, light-mediated "grafting-from" approach for synthesizing DNA-polymer conjugates.
• To explore the use of blue-light-mediated reversible addition-fragmentation chain-transfer (Photo-RAFT) polymerization for this purpose.

Main Methods:

• Utilized blue-light-mediated Photo-RAFT polymerization with Eosin Y photocatalyst and ascorbic acid.
• Initiated polymerization from RAFT agent-terminated DNA sequences.
• Successfully polymerized methacrylates, acrylates, and acrylamides.

Main Results:

• Demonstrated successful polymerization of three monomer families directly from DNA.
• Showed that polymer chain length can be controlled by adjusting the monomer to DNA-initiator ratio.
• Confirmed that the self-assembly properties of the DNA strands were preserved during conjugation.

Conclusions:

• Developed a facile and efficient blue-light-mediated "grafting-from" method for DNA-polymer conjugate synthesis.
• This Photo-RAFT approach overcomes steric limitations of traditional methods.
• The method maintains DNA self-assembly features, enabling the creation of functional biomaterials.