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Published on: February 11, 2019
Enzyme stabilization by domain insertion into a thermophilic protein
Chung-Sei Kim1, Brennal Pierre, Marc Ostermeier
1Othmer-Jacobs Department of Chemical and Biological Engineering, Polytechnic Institute of New York University, 6 MetroTech Center, Brooklyn, NY 11201, USA.
Researchers stabilized exoinulinase (EI) by inserting its domain into a scaffold protein. This novel method enhances enzyme kinetic stability without altering its activity, opening new applications in inulin processing and bioethanol production.
Area of Science:
- Biotechnology
- Enzyme Engineering
- Protein Stabilization
Background:
- Exoinulinase (EI) kinetic stability is limited, restricting its use in inulin processing and bioethanol fermentation.
- Conventional enzyme stabilization via mutagenesis can negatively impact enzyme activity.
Purpose of the Study:
- To develop a novel method for stabilizing exoinulinase (EI) without altering its primary sequence.
- To improve the kinetic stability of EI for broader industrial applications.
Main Methods:
- Domain insertion of exoinulinase (EI) into a thermophilic scaffold protein.
- Utilized a thermophilic maltodextrin-binding protein (PfMBP) from Pyrococcus furiosus as the scaffold.
- Assessed kinetic stability at 37 degrees C and enzyme activity.
Main Results:
- Successfully stabilized exoinulinase (EI) through domain insertion into PfMBP.
- Achieved improved kinetic stability at 37 degrees C without compromising EI activity.
- Hypothesized increased kinetic barrier for inactivation contributes to enhanced stability.
Conclusions:
- Domain insertion into a thermophilic scaffold is an effective strategy for enzyme stabilization.
- This method offers a promising alternative to mutagenesis for enhancing enzyme kinetic stability.
- The stabilized EI has potential for improved industrial applications in inulin biotransformation and fermentation.
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