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Construction, expression, and characterization of a thermostable xylanase
1Department of Biological Science, College of Life Science, Zhejiang University, Hangzhou, 310029, PR China.
Current Microbiology
|August 9, 2005
Summary
A novel hybrid xylanase, Btx, was engineered for enhanced thermostability and broader pH activity. This enzyme, derived from Thermomonospora fusca and Bacillus subtilis xylanases, shows improved performance for industrial applications.
Area of Science:
- Biochemistry
- Enzyme Engineering
Background:
- Xylanases are crucial enzymes in biomass degradation.
- Thermostability and broad pH activity are desirable traits for industrial xylanase applications.
Purpose of the Study:
- To construct and characterize a hybrid xylanase (Btx) with improved thermostability and pH profile.
- To investigate the role of N-terminal amino acid sequences in xylanase function.
Main Methods:
- A hybrid gene (btx) was created by combining Thermomonospora fusca xylanase A (TfxA) and Bacillus subtilis xylanase A (BsxA) sequences.
- The btx gene was expressed in Escherichia coli BL21.
- Enzyme activity, thermostability, and pH profiles of the resulting Btx enzyme were analyzed.
Main Results:
- The hybrid xylanase Btx exhibited a larger halo size on RBB xylan plates compared to parent enzymes.
- Btx demonstrated optimal activity at 50-60°C and pH 6.0.
- Btx displayed significant thermostability and maintained over 80% activity across a wide pH range (5.0-9.0).
Conclusions:
- The N-terminal sequence of TfxA plays a critical role in conferring thermostability to the hybrid enzyme.
- The engineered Btx enzyme possesses superior characteristics for potential industrial applications.