期刊
CHEM CATALYSIS
卷 1, 期 1, 页码 146-161出版社
CELL PRESS
DOI: 10.1016/j.checat.2021.03.001
关键词
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资金
- National Science Foundation [MCB 1942596]
- North Dakota State University New Faculty Startup Funds
- USDA-NIFA [2021-67021-34002]
The co-precipitation of enzymes in metal-organic frameworks with Ca2+ and carboxylate ligands under ambient aqueous conditions has been shown to result in stable enzyme@metalorganic material composites across a wide pH range. The catalytic efficiency of enzymes depended on the ligand used, indicating a correlation between enzyme backbone dynamics, ligand selection, and catalytic efficiency. This approach provides a solution to the stability issue of aqueous-phase co-precipitation and has potential applications in bio-catalysis research and industry.
Co-precipitation of enzymes in metal-organic frameworks is a unique enzyme-immobilization strategy but is challenged by weak acid-base stability. To overcome this drawback, we discovered that Ca2+ can co-precipitate with carboxylate ligands and enzymes under ambient aqueous conditions and form enzyme@metalorganic material composites stable under a wide range of pHs (3.7-9.5). We proved this strategy on four enzymes with varied isoelectric points, molecular weights, and substrate sizes-lysozyme, lipase, glucose oxidase (GOx), and horseradish peroxidase (HRP)-as well as the cluster of HRP and GOx. Interestingly, the catalytic efficiency of the studied enzymes was found to depend on the ligand, probing the origins of which resulted in a correlation among enzyme backbone dynamics, ligand selection, and catalytic efficiency. Our approach resolved the long-lasting stability issue of aqueous-phase co-precipitation and can be generalized to bio-catalysis with other enzymes to benefit both research and industry.
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