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Published on: April 6, 2016
Designing a mesoporous cascade reactor for enhanced enzymatic performance
Ziman Chen1, Qunfeng Fan1, Jianhua Wang1
1International Joint Bioenergy Laboratory of Ministry of Education, National Energy Research and Development Center for Biorefinery, Beijing Key Laboratory of Green Chemicals Biomanufacturing, Beijing Synthetic Bio-manufacturing Technology Innovation Center, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China.
This study developed a new method to immobilize enzymes using defect-engineered covalent organic frameworks and a polydopamine shell, significantly boosting their stability and reusability for biocatalysis.
Area of Science:
- Biocatalysis
- Materials Science
- Biotechnology
Background:
- Designing stable and reusable biomimetic catalysts is crucial for biocatalysis.
- Enzyme immobilization often faces challenges with activity, stability, and reusability.
Purpose of the Study:
- To create a robust biocatalytic cascade reactor using a hierarchical and modular strategy.
- To enhance enzyme activity, stability, and reusability through spatial organization and protective coating.
Main Methods:
- Constructed defect-engineered covalent organic frameworks (COFs) with tunable pore architectures.
- Immobilized dual enzymes, d-amino acid oxidase (DAAO) and cytochrome c (Cyt c), within COFs via physical and covalent methods.
- Encapsulated the enzyme-COF system with a polydopamine (PDA) shell to mimic cellular compartmentalization.
Main Results:
- COF-immobilized enzymes showed significantly improved catalytic performance: DAAO activity increased by 165% and catalytic efficiency (kcat/Km) by 430% compared to free enzymes.
- The PDA coating enhanced enzyme resilience to harsh conditions (high temperature, organic solvents, proteases, alkaline pH).
- Engineered bioreactors retained over 85% of initial activity after 22 cycles, outperforming conventional methods.
Conclusions:
- The developed hierarchical and modular strategy provides a generalizable platform for constructing artificial enzymatic systems with cellular-level organization.
- This approach offers new opportunities for continuous biomanufacturing, biosensing, and synthetic biology in demanding environments.
