DNA-Polymer Nanostructures by RAFT Polymerization and Polymerization-Induced Self-Assembly

Area of Science:

• Polymer Chemistry
• Nanotechnology
• Bioconjugation

Background:

• Amphiphilic DNA-polymer conjugates exhibit complex self-assembly behaviors crucial for nanotechnology.
• Traditional synthesis of these conjugates is often challenging and limits structural diversity.

Purpose of the Study:

• To establish a novel platform technology for synthesizing DNA-polymer nanostructures with controlled shapes.
• To leverage polymerization-induced self-assembly (PISA) for creating functional DNA-polymer conjugates from single-stranded DNA (ssDNA).

Main Methods:

• Developed a "grafting from" protocol for thermal reversible addition-fragmentation chain-transfer (RAFT) polymerization from ssDNA under ambient conditions.
• Synthesized functional DNA-polymer conjugates and DNA-diblock conjugates using acrylates and acrylamides.
• Applied PISA to create isotropic and anisotropic nanostructures by tuning polymer block length.

Main Results:

• Successfully synthesized functional DNA-polymer conjugates and DNA-diblock conjugates via a novel ssDNA-based RAFT polymerization.
• Demonstrated the ability of PISA to produce DNA-polymer nanostructures of varying morphologies (isotropic and anisotropic) by controlling polymer chain length.
• Achieved intrinsic functionality in nanostructures through subsequent hybridization with dye-labeled complementary ssDNA.

Conclusions:

• Polymerization-induced self-assembly (PISA) offers a powerful and versatile route for constructing diverse DNA-polymer nanostructures.
• The developed ssDNA-based RAFT polymerization protocol overcomes traditional synthesis challenges.
• This platform enables the creation of intrinsically functional nanostructures for advanced applications.