Wavelength-dependent feedback behavior in light-gated polymersome nanoreactors

Area of Science:

• Synthetic Biology
• Nanotechnology
• Chemical Engineering

Background:

• Biological systems utilize complex feedback mechanisms for adaptation and regulation.
• Existing synthetic systems often lack precise, stimulus-specific feedback control.
• Light-responsive materials offer potential for dynamic regulation of chemical processes.

Purpose of the Study:

• To develop a synthetic nanoreactor system with orthogonal, wavelength-dependent feedback loops.
• To achieve light-programmed, autonomous regulation of enzymatic activity.
• To explore applications in synthetic cell mimics and microscale environment modulation.

Main Methods:

• Fabrication of polymersomes encapsulating an esterase enzyme and a Donor-Acceptor Stenhouse Adduct (DASA) photoswitch.
• Investigation of light-gated membrane permeability switching upon irradiation with specific wavelengths (yellow and blue light).
• Analysis of wavelength-dependent positive and negative feedback mechanisms controlling enzyme kinetics via spectral unmasking and competition.

Main Results:

• Demonstrated wavelength-specific positive feedback under yellow light (590 nm) through spectral unmasking, enhancing enzyme activity.
• Achieved wavelength-specific negative feedback under blue light (405 nm) via spectral competition, suppressing enzyme activity.
• Showcased reversible and tunable control over enzymatic reaction kinetics based on light stimulus.

Conclusions:

• The synthetic nanoreactor platform enables orthogonal, light-programmed feedback control.
• This system represents a paradigm shift for autonomous regulation in synthetic cell mimics.
• Potential for dynamic modulation of microscale environments and biointerfaces without genetic intervention.