Using Tools from Optogenetics to Create Light-Responsive Biomaterials: LOVTRAP-PEG Hydrogels for Dynamic Peptide...

Area of Science:

• Biomaterials Science
• Biotechnology
• Cell Biology

Background:

• Hydrogels are valuable for in vitro cell culture, mimicking native tissues.
• Precise spatiotemporal control of biomolecule presentation in hydrogels remains a challenge.

Purpose of the Study:

• To develop a novel method for spatiotemporal control of biomolecule presentation within synthetic hydrogels.
• To utilize light-sensing proteins (LSPs) as light-activated reversible binding sites in poly(ethylene glycol) (PEG) hydrogels.

Main Methods:

• Immobilization of the LOV2 protein domain within PEG hydrogels.
• Utilizing the LOVTRAP system (LOV2 and Zdark [Zdk]) for reversible protein binding.
• Employing blue light to activate and deactivate the binding of Zdk-tagged proteins.

Main Results:

• Demonstrated successful capture and light-induced release of a fluorescent protein using LOV2-functionalized PEG hydrogels.
• Achieved a 30% reduction in fluorescence in light-exposed regions, indicating controlled release.
• Showcased the reversible binding capability of the LOVTRAP system, with successful capture and release cycles repeated at least three times.

Conclusions:

• Light-sensing proteins offer a viable strategy for dynamic and spatially controlled presentation of ligands within hydrogels.
• This method enables precise control over biomolecule display, advancing in vitro cell culture and tissue engineering.
• The LOVTRAP system provides a robust platform for creating responsive biomaterial interfaces.