Noncovalent Enzyme Nanogels via a Photocleavable Linkage

Area of Science:

• Biomaterials Science
• Protein Engineering
• Nanotechnology

Background:

• Enzyme nanogels (ENGs) protect therapeutic proteins from in vivo degradation.
• Current methods involve covalent modification or noncovalent assembly, with limitations.
• A hybrid approach is needed for efficient and stable enzyme encapsulation.

Purpose of the Study:

• To develop a new method for preparing noncovalent enzyme nanogels (ENGs).
• To utilize a heterobifunctional, photocleavable monomer for controlled nanogel formation.
• To enhance the stability of enzymes encapsulated within the nanogels.

Main Methods:

• A heterobifunctional, photocleavable monomer was used for initial covalent modification of the protein surface.
• Radical polymerization with poly(ethylene glycol) methacrylate and ethylene glycol dimethacrylate crosslinker was performed.
• Photoirradiation was employed to cleave the linkage, yielding noncovalent ENGs.
• Phenylalanine ammonia lyase (PAL) was used as a model enzyme, and nanogel characteristics were analyzed using DLS and AFM.

Main Results:

• Well-defined noncovalent ENGs of approximately 80 nm were successfully prepared.
• Encapsulated PAL demonstrated enhanced stability against trypsin and low pH compared to free PAL.
• The method provides a versatile platform for enzyme stabilization.

Conclusions:

• The developed hybrid approach enables the creation of stable, noncovalent enzyme nanogels.
• This method offers a promising strategy for protecting therapeutic enzymes in vivo.
• The enhanced stability of encapsulated enzymes has significant implications for enzyme-based therapies.