Click'n ROPISA: One-Pot Synthesis of Ultrabright Fluorescent Nanoparticles Made of Polypeptides

Area of Science:

• Polymer Chemistry
• Nanotechnology
• Bioconjugation

Background:

• Fluorescent nanoparticles are crucial for bioimaging and sensing.
• Current preparation methods involve multiple steps, hindering scalability and precise structural control.

Purpose of the Study:

• To develop a streamlined, scalable method for synthesizing fluorescent polypeptide nanoparticles.
• To enable simultaneous nanoparticle formation and fluorophore integration.
• To create bright, structurally uniform nanoparticles for advanced bioimaging and sensing.

Main Methods:

• A one-pot strategy combining aqueous ring-opening polymerization-induced self-assembly (ROPISA) with copper-catalyzed azide-alkyne cycloaddition (CuAAC).
• Utilized γ-propargyl-L-glutamate N-carboxyanhydride for polymerization.
• Incorporated diverse azido-functionalized fluorophores via CuAAC click chemistry.

Main Results:

• Successfully synthesized fluorescent polypeptide nanoparticles using the "Click'n ROPISA" process.
• Achieved tunable emission across the visible spectrum with high brightness and structural uniformity.
• Demonstrated efficient Förster resonance energy transfer (FRET) for sensing applications and enabled single-particle tracking in microscopy.

Conclusions:

• The one-pot "Click'n ROPISA" method offers a scalable and versatile approach to fluorescent nanoparticle synthesis.
• These nanoparticles show significant potential for advanced bioimaging, sensing, and diagnostics.
• The process allows for dense fluorophore incorporation, enhancing FRET efficiency and imaging capabilities.