Vesicle Fusion Triggered by Optically Heated Gold Nanoparticles

Area of Science:

• Biophysics
• Nanotechnology
• Cell Biology

Background:

• Membrane fusion is a fundamental biological process essential for cellular functions.
• Controlled induction of membrane fusion is crucial for various applications, including drug delivery and synthetic biology.
• Existing methods for inducing membrane fusion often lack spatial precision or scalability.

Purpose of the Study:

• To develop a precise method for inducing and controlling membrane fusion using localized heating.
• To investigate the kinetics of membrane and cargo mixing following laser-induced fusion.
• To demonstrate the utility of this method for triggering nanoscale biological reactions.

Main Methods:

• Utilizing gold nanoparticles as localized heat sources upon laser irradiation.
• Inducing fusion between adjacent vesicles through precise thermal control.
• Employing membrane dyes and aqueous content markers to quantify mixing dynamics.
• Observing I-BAR protein-mediated membrane tubulation triggered by the fusion event.

Main Results:

• Laser-irradiated gold nanoparticles successfully induced localized membrane fusion in vesicles.
• The observed mixing time scales for membrane dyes and aqueous content were consistent with diffusive mixing.
• The study demonstrated the successful triggering of I-BAR protein-mediated membrane tubulation via laser-induced fusion.
• This technique offers a controllable method for initiating nanoscale reactions.

Conclusions:

• Localized heating of gold nanoparticles provides a precise and effective method for inducing vesicle membrane fusion.
• The developed technique allows for controlled cargo and membrane mixing at the nanoscale.
• This approach serves as a valuable tool for initiating and studying nanoscale reactions, such as protein-mediated membrane remodeling.