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Efficient selection for thermostable protease in Thermus thermophilus
H Takagi1, A Suzumura, Y Hasuura
1Department of Bioscience, Fukui Prefectural University, Japan. hiro@fpu.ac.jp
Bioscience, Biotechnology, and Biochemistry
|June 1, 2000
Summary
Researchers developed a method to find heat-stable proteases using the extreme thermophile Thermus thermophilus. This technique allows for the selection of these enzymes, crucial for industrial applications.
Area of Science:
- Biotechnology
- Enzymology
- Extremophile Research
Background:
- Extreme thermophiles like Thermus thermophilus are valuable sources of thermostable enzymes.
- Proteases are essential enzymes with broad industrial applications.
- Developing efficient selection methods for thermostable proteases is crucial for biotechnology.
Purpose of the Study:
- To establish an efficient procedure for selecting thermostable proteases.
- To utilize a non-protease-secreting mutant of Thermus thermophilus as a host.
- To express aqualysin I, a thermostable protease, in the host organism.
Main Methods:
- Construction of an expression plasmid for aqualysin I from Thermus aquaticus YT-1.
- Transformation of a non-protease-secreting T. thermophilus mutant with the expression plasmid.
- Cultivation of recombinant T. thermophilus on minimal medium with casein as the sole nutrient source.
Main Results:
- Recombinant T. thermophilus successfully produced and secreted active aqualysin I into the medium.
- The engineered cells demonstrated growth on minimal medium containing casein, indicating protease activity.
- The established procedure efficiently selected for thermostable protease production.
Conclusions:
- An effective method for selecting thermostable proteases in Thermus thermophilus was developed.
- This method facilitates the identification and utilization of heat-stable enzymes.
- The findings have implications for enzyme engineering and industrial biotechnology.