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High Throughput Screening of Fungal Endoglucanase Activity in Escherichia coli
Published on: August 13, 2011
Thermostable bacterial endoglucanases mined from SWISS-PROT database
Li-Huan Qiu1, Chun-Xiu Li, Jie Sun
1State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, People's Republic of China.
Applied Biochemistry and Biotechnology
|October 13, 2011
Summary
Two novel endoglucanases (EGs), EGtf1 and EGtf2, exhibit exceptional thermostability and activity under industrial conditions. These enzymes show significant potential for biomass industry applications due to their enhanced performance and stability.
Area of Science:
- Biochemistry
- Enzymology
- Industrial Biotechnology
Background:
- Cellulose deconstruction is crucial for biomass utilization.
- Endoglucanases (EGs) are key enzymes for breaking down cellulose.
- Industrial applications require EGs with high activity and thermostability.
Purpose of the Study:
- To identify and characterize novel endoglucanases with superior industrial performance.
- To evaluate the activity and stability of selected EGs under various conditions.
Main Methods:
- Selection of 43 putative EG genes from SWISS-PROT database.
- Overexpression of EGtf1 and EGtf2 in Escherichia coli.
- Purification using one-step affinity chromatography.
- Enzyme activity and stability assays at different pH, temperature, and in presence of metal ions/organic solvents.
Main Results:
- EGtf1 and EGtf2 showed optimal activity at pH 5.0 and 50 °C.
- Demonstrated outstanding thermostability with a half-life of 1,386 h at 50 °C, ~100-fold higher than reported EGs.
- Unaffected by most metal ions and organic solvents, with dodecanol enhancing activity 2.1-2.7 fold.
Conclusions:
- EGtf1 and EGtf2 possess remarkable thermostability and activity, suitable for harsh industrial environments.
- These enzymes are promising candidates for protein engineering and biomass industry applications.
