Non-monotonous enzyme-assisted self-assembly profiles resulting from reaction-diffusion processes in host gels

Area of Science:

• Materials Science
• Biomaterials Engineering
• Chemical Engineering

Background:

• Reaction-diffusion (RD) processes drive pattern formation in various materials.
• Hydrogel functionalization is crucial for advanced biomaterials and artificial living systems.
• Enzyme-assisted self-assembly (EASA) offers a novel approach for material patterning.

Purpose of the Study:

• To investigate the use of EASA for creating patterned peptide self-assemblies within hydrogels.
• To explore the influence of EASA on hydrogel mechanical properties.
• To develop a reaction-diffusion model for understanding EASA-driven pattern formation.

Main Methods:

• Utilized a phosphatase enzyme within a host hydrogel to facilitate peptide self-assembly.
• Investigated peptide diffusion from a liquid/hydrogel interface.
• Employed nanoindentation to measure local changes in gel mechanical properties.

Main Results:

• Demonstrated spontaneous formation of dephosphorylated peptide self-assembly patterns with multiple maxima.
• Observed pattern formation along and perpendicular to the gel-solution interface.
• Showcased that EASA-induced patterns alter local hydrogel mechanics.
• Identified similarities between EASA patterns and Liesegang patterns.

Conclusions:

• EASA is an effective method for functionalizing hydrogels and creating organic Liesegang-like microstructures.
• The observed patterns result from nucleation and growth processes within the hydrogel.
• The study provides a reaction-diffusion model for EASA pattern formation, applicable to biomaterials and artificial living systems.