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Published on: February 5, 2021
Enzymes in a golden cage.
Yael Baruch-Shpigler1, David Avnir1
1Institute of Chemistry, The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem Jerusalem 9190401 Israel David.Avnir@mail.huji.ac.il.
We developed a novel method to immobilize enzymes in bulk metallic gold, enhancing their stability and activity. This 3D metallic encaging protects enzymes, enabling new applications in biotechnology and medicine.
Area of Science:
- Biotechnology
- Materials Science
- Enzyme Engineering
Background:
- Enzyme immobilization is crucial for industrial and medical applications.
- Traditional methods like 2D adsorption and covalent binding have limitations in enzyme protection and stability.
- A novel 3D metallic encaging approach offers enhanced protection and stability.
Purpose of the Study:
- To introduce a general method for entrapping enzymes within bulk metallic gold.
- To demonstrate the enhanced stability and functionality of enzymes immobilized using this 3D metallic encaging technique.
- To explore the potential applications of enzyme-gold conjugates in various fields.
Main Methods:
- Developed a general method for the 3D entrapment of enzymes within bulk metallic gold.
- Successfully immobilized five diverse enzymes: l-asparaginase, collagenase, horseradish peroxidase, laccase, and glucose oxidase.
- Optimized gold synthesis conditions to maintain enzyme activity during immobilization.
Main Results:
- Enzymes entrapped in gold exhibited enhanced thermal stability and protection against harsh conditions (e.g., pH 13).
- Immobilized enzymes retained Michaelis-Menten kinetics, with determined activation energies.
- Demonstrated good recyclability (eight cycles) and potential for multi-enzymatic reactions using enzyme@gold powders.
Conclusions:
- The 3D metallic encaging method provides a robust platform for enzyme immobilization.
- This technique significantly improves enzyme stability, activity, and reusability.
- Enzyme-gold conjugates hold broad potential for applications in medicine, biotechnology, biofuel cells, and biosensing.
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