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Force-Clamp Rheometry for Characterizing Protein-based Hydrogels
Published on: August 21, 2018
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A Modeling-Based Design to Engineering Protein Hydrogels with Random Copolymers.
Annalisa Cardellini1,2, Felipe Jiménez-Ángeles2, Pietro Asinari1,3
1Politecnico di Torino, Torino 10129, Italy.
ACS Nano
|October 13, 2021
Summary
This study introduces a computational design for enzyme-polymer hydrogels, offering precise control over protein stability and activity for industrial use. The findings provide guidelines for creating effective enzyme immobilization strategies.
Area of Science:
- Bioconjugate chemistry
- Materials science
- Biotechnology
Background:
- Protein enzymes are crucial for technological applications but require supportive materials for stability outside native environments.
- Direct enzyme-polymer self-assembly in aqueous solutions is a promising method for immobilizing enzymes, enhancing stability and activity.
- Engineering enzyme-polymer hydrogels requires understanding the physical-chemistry of both components for optimal design.
Purpose of the Study:
- To propose a modeling-based design for engineering hydrogels of cytochrome P450 and PETase using styrene/2-vinylpyridine (2VP) random copolymers.
- To provide quantitative guidelines for selecting between protein-polymer hydrogel structures and single-protein encapsulation.
- To elucidate the mechanisms of enzyme-polymer coassembly based on physical-chemistry principles.
Main Methods:
- Computational modeling was used to design enzyme-polymer hydrogels.
- Tuning copolymer fractions of polar and charged groups (via quaternization of 2VP and sulfonation of styrene) was employed.
- Analysis focused on protein surface domains, polar interactions, hydration effects, and hydrophobic interactions.
Main Results:
- Polar interactions and hydration effects promote elongated enzyme-polymer complexes, suggesting membrane-like coassembly.
- Single-protein encapsulation is effective when polar group fraction is decreased and charge fraction is increased up to 15%.
- Hydrophobic interactions initially drive enzyme-polymer assembly, with protein nonpolar residues acting as robust contact points.
Conclusions:
- The study provides bioconjugate phase diagrams for optimal material design in enzyme immobilization.
- Quantitative guidelines are established for engineering enzyme-polymer hydrogels and single-protein encapsulation.
- Understanding enzyme-polymer coassembly mechanisms is key to advancing industrial applications of enzymes.
