Smart hydrogels containing adenylate kinase: translating substrate recognition into macroscopic motion

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Enzyme Engineering

Background:

• Hydrogels are versatile materials with applications in drug delivery and tissue engineering.
• Enzyme-responsive materials offer potential for controlled actuation and sensing.
• Integrating enzymes into synthetic polymer networks presents challenges in maintaining activity and achieving desired responses.

Purpose of the Study:

• To develop enzyme-based hybrid hydrogels capable of macroscopic motion.
• To investigate the relationship between enzyme conformational changes and hydrogel actuation.
• To explore the potential of these materials in substrate-triggered applications.

Main Methods:

• Covalent incorporation of an adenylate kinase mutant into HPMA copolymer- and PEG-based hydrogel networks.
• Utilizing a mutant adenylate kinase with two thiol groups for crosslinking.
• Characterizing hydrogel properties and macroscopic motion in response to substrate binding.

Main Results:

• Successful preparation of enzyme-based hybrid hydrogels with integrated adenylate kinase.
• Demonstrated substrate-triggered nanoscale conformational changes of the enzyme.
• Observed translation of enzyme conformational changes into macroscopic hydrogel motion.

Conclusions:

• Enzyme-based hybrid hydrogels can be engineered to exhibit substrate-responsive macroscopic movement.
• This approach offers a novel strategy for creating smart biomaterials with tunable actuation.
• The developed hydrogels hold promise for applications requiring precise, enzyme-mediated mechanical responses.