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Semirational Design Based on Consensus Sequences to Balance the Enzyme Activity-Stability Trade-Off
Yang Zhao1,2, Kun Chen1, Haixia Yang1
1National Engineering Research Center for Fruit & Vegetable Processing, Key Laboratory of Fruit & Vegetable Processing, Ministry of Agriculture and Rural Affairs, Beijing Key Laboratory for Food Non-Thermal Processing, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China.
Enzyme engineering overcomes the stability-activity trade-off. Novel mutations in Rosa roxburghii copper-zinc superoxide dismutase (RrCuZnSOD) enhanced both stability and activity, offering new possibilities for enzyme applications.
Area of Science:
- Biochemistry
- Enzyme Engineering
- Protein Engineering
Background:
- The stability-activity trade-off is a significant challenge in enzyme engineering, where increased stability often leads to reduced enzymatic activity.
- Rosa roxburghii copper-zinc superoxide dismutase (RrCuZnSOD) serves as a model enzyme to investigate this phenomenon.
Purpose of the Study:
- To explore strategies for overcoming the stability-activity trade-off in enzyme engineering.
- To develop enhanced variants of RrCuZnSOD with improved thermostability and retained or increased enzymatic activity.
Main Methods:
- Semirational design based on consensus sequences was employed to introduce single-site mutations.
- Mutants were selected based on activity, followed by combinatorial mutation to generate double-site mutants.
- Structural analysis and molecular dynamics simulations were used to elucidate the underlying mechanisms.
Main Results:
- Two double-site mutants, D25/A115T and A115T/S135P, were generated with superior enzymatic properties.
- These mutants showed increased half-lives (T1/2) at 80°C by 1.2- and 1.6-fold, respectively.
- Melting temperatures (Tm) increased by 3.4°C and 2.5°C, respectively, without compromising enzymatic activity.
Conclusions:
- Additive and synergistic effects from specific mutations can concurrently enhance both thermostability and enzymatic activity.
- The study successfully overcame the stability-activity trade-off in RrCuZnSOD.
- Understanding the mechanisms through structural and simulation studies provides a foundation for rational enzyme design.
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