Bioengineering a Light-Responsive Encapsulin Nanoreactor: A Potential Tool for In Vitro Photodynamic Therapy

Area of Science:

• Biotechnology and Nanomedicine
• Biochemistry and Molecular Biology

Background:

• Encapsulins are prokaryotic protein nanocompartments capable of self-assembly.
• Re-engineering encapsulins as nanoreactors for biochemical reactions is an emerging field.
• Current limitations include the lack of precise spatial and temporal control over nanoreactor activation.

Purpose of the Study:

• To construct a light-responsive encapsulin nanoreactor for controlled reactive oxygen species (ROS) production.
• To investigate the potential of this nanoreactor in photodynamic therapy applications.

Main Methods:

• Encapsulins were loaded with mini-singlet oxygen generator (miniSOG), a blue-light-activated photosensitizer.
• The ability of the nanocompartments to stably encapsulate miniSOG was confirmed.
• ROS generation upon blue light exposure was assessed, and its effect on lung cancer cells was evaluated in vitro.

Main Results:

• The encapsulin nanoreactors successfully encased miniSOG.
• Blue light activation mediated the conversion of molecular oxygen into ROS by the encapsulated miniSOG.
• Generated ROS induced photosensitized oxidation reactions, leading to toxicity in lung cancer cells.

Conclusions:

• A novel light-responsive encapsulin nanoreactor system was developed.
• This system allows for the precise, light-controlled generation of ROS.
• The nanoreactor platform shows promise for photodynamic therapy and modulating ROS-driven processes in biomedicine and biotechnology.