Renewable DNA Proportional-Integral Controller with Photoresponsive Molecules.

Area of Science:

• Biomolecular Engineering
• Molecular Systems Engineering
• Synthetic Biology

Background:

• Molecular robots are intelligent systems requiring precise control, often achieved through feedback mechanisms.
• Molecular proportional-integral (PI) controllers regulate concentrations but are limited by fuel DNA strand consumption.
• Existing DNA-based feedback systems face challenges in sustained operation due to finite fuel resources.

Purpose of the Study:

• To design a self-sustaining molecular PI controller for molecular robots.
• To address the limitation of fuel DNA strand depletion in molecular feedback systems.
• To develop a method for regenerating fuel strands within a DNA reaction system.

Main Methods:

• Developed a molecular PI control system incorporating photoresponsive reaction control.
• Utilized azobenzene, a photoresponsive molecule, to direct reaction pathways using light.
• Validated the renewable PI controller design through kinetic-based numerical simulations and experimental DNA circuits.

Main Results:

• Demonstrated a novel design for a renewable molecular PI controller.
• Successfully regenerated fuel DNA strands using light-controlled azobenzene molecules.
• Validated the proof-of-principle through both computational modeling and experimental testing.

Conclusions:

• The developed photoresponsive system enables sustained operation of molecular PI controllers.
• This renewable design overcomes fuel consumption limitations in DNA-based molecular systems.
• The approach offers a promising strategy for advanced molecular robotics and control systems.