A highly efficient cell-free protein synthesis system from Escherichia coli

Area of Science:

• Biochemistry
• Molecular Biology
• Synthetic Biology

Background:

• Cell-free protein synthesis (CFPS) systems offer a powerful platform for rapid protein production.
• Existing CFPS systems face limitations in productivity and efficiency.
• Escherichia coli (E. coli) extracts are commonly used but can be further optimized.

Purpose of the Study:

• To enhance the productivity of a cell-free coupled transcription/translation system from E. coli.
• To investigate the interdependent roles of phosphoenolpyruvate (PEP) and poly(ethylene glycol) (PEG) concentrations.
• To improve protein yields beyond current reported benchmarks.

Main Methods:

• Modified a cell-free coupled transcription/translation system using T7 phage RNA polymerase.
• Investigated the co-optimization of PEP and PEG concentrations.
• Utilized a condensed cell extract (30,000 x g pellet) instead of conventional extract.
• Supplemented the reaction mixture with a pool of amino acids.

Main Results:

• Achieved a maximum protein productivity of 0.4 mg/ml.
• Identified an interdependent relationship between PEP and PEG concentrations for optimal synthesis.
• Demonstrated that a condensed cell extract significantly increased the initial rate of protein synthesis.
• Further increased productivity to 0.4 mg/ml through amino acid supplementation.

Conclusions:

• The modified cell-free system demonstrates superior protein synthesis productivity compared to previously reported systems.
• Optimization of key reaction components and extract preparation is crucial for maximizing CFPS efficiency.
• This enhanced CFPS system provides a valuable tool for research and biotechnology applications.