Genetically Encoded Photocleavable Linkers for Patterned Protein Release from Biomaterials

Area of Science:

• Biomaterials Science
• Biotechnology
• Molecular Biology

Background:

• Proteins are crucial for biological processes, but controlling their presentation and release from biomaterials remains challenging.
• Existing methods often yield heterogeneous protein populations with reduced activity, limiting applications for fragile biomolecules like growth factors.

Purpose of the Study:

• To develop a modular, scalable method for immobilizing and photoreleasing bioactive proteins from hydrogels with high precision.
• To create monodisperse, genetically encoded protein chimeras for controlled release applications.

Main Methods:

• Utilized chemoenzymatic reactions, bioorthogonal chemistry, and optogenetics to tether proteins to hydrogels via a photocleavable protein (PhoCl).
• Employed mask-based and laser-scanning lithography with visible light (λ ≈ 400 nm) for spatiotemporal control over protein release.
• Demonstrated site-specific immobilization and dose-dependent, irreversible backbone photoscission of the PhoCl linker.

Main Results:

• Successfully created monodisperse protein-hydrogel conjugates with preserved bioactivity.
• Achieved precise spatiotemporal control over protein release from hydrogels.
• Demonstrated photopatterned epidermal growth factor presentation to promote anisotropic cellular proliferation in 3D.

Conclusions:

• The developed method offers a scalable and precise approach for controlling protein presentation and release from biomaterials.
• This technique retains protein activity and enables patterned delivery, showing promise for diagnostics, drug delivery, and regenerative medicine.