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Using Defect Control To Break the Stability-Activity Trade-Off in Enzyme Immobilization via Competitive Coordination
Jianghua Yang1, Wenguang Huang1, Wentao Zhang1
1State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing210023, China.
Researchers developed a method to improve enzyme stability and activity using metal-organic frameworks. By controlling defects through competitive coordination, they enhanced enzyme performance for biomacromolecule engineering applications.
Area of Science:
- Materials Science
- Biotechnology
- Chemical Engineering
Background:
- Enzyme immobilization in metal-organic frameworks (MOFs) enhances enzyme usability.
- Confined enzymes face a stability-activity trade-off due to crystallinity versus accessibility.
- Zeolitic imidazolate framework-8 (ZIF-8) is a common MOF for enzyme encapsulation.
Purpose of the Study:
- To overcome the stability-activity trade-off in enzyme-MOF composites.
- To explore defect control via competitive coordination for enhanced enzyme function.
- To investigate the encapsulation process of laccase within ZIF-8.
Main Methods:
- Utilized laccase and ZIF-8 as model systems.
- Employed competitive coordination between the enzyme and MOF ligand precursor.
- Analyzed the three-stage encapsulation process: nucleation, crystallization, and recrystallization.
Main Results:
- Identified a three-stage encapsulation process (nucleation-crystallization-recrystallization).
- Biocomposites collected before recrystallization showed improved activity and stability.
- Demonstrated that controlling defects via competitive coordination resolves the stability-activity trade-off.
Conclusions:
- Competitive coordination offers a novel strategy to control defects in MOF-enzyme composites.
- Optimized MOF encapsulation by arresting the process before recrystallization enhances both enzyme stability and activity.
- Findings provide significant implications for engineering biomacromolecules for industrial applications.
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