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Altered temperature induction sensitivity of the lambda pR/cI857 system for controlled gene E expression in
W Jechlinger1, M P Szostak, A Witte
1Institute of Microbiology and Genetics, University of Vienna, Austria. W.Jechlinger@evax.de
FEMS Microbiology Letters
|May 5, 1999
Summary
Researchers modified a bacteriophage PhiX174 lysis gene E system for bacterial ghosts production. A new mutation allows bacteria to grow at 37 degrees C before lysis induction at 42 degrees C.
Area of Science:
- Microbiology
- Molecular Biology
- Biotechnology
Background:
- Bacteriophage PhiX174 lysis gene E enables efficient Gram-negative bacterial cell lysis.
- Bacterial ghosts (empty cell envelopes) are explored as vaccine candidates.
- Current methods require bacterial growth at 28°C, limiting applicability for pathogens thriving at 37°C.
Purpose of the Study:
- To engineer a heat-stable lysis system for bacterial ghosts production.
- To enable bacterial cultivation at physiological temperatures (37°C) before lysis induction.
Main Methods:
- A lysis plasmid (pAW12) containing bacteriophage PhiX174 lysis gene E was used.
- The system is controlled by the lambda pR promoter and temperature-sensitive cI857 repressor.
- A specific mutation was introduced into the lambda pR promoter to enhance heat stability.
Main Results:
- The modified lambda pR promoter demonstrated stringent repression of gene E up to 36°C.
- Cell lysis was successfully induced at 42°C, indicating successful system activation.
- This system allows bacterial growth at 37°C prior to lysis induction.
Conclusions:
- A heat-stable lysis system was developed for bacterial ghosts production.
- This advancement supports the investigation of bacterial ghosts as vaccines under more physiologically relevant conditions.
- The modified system broadens the potential applications of bacterial ghosts in biotechnology and vaccinology.