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Escherichia coli-Based Cell-Free Protein Synthesis: Protocols for a robust, flexible, and accessible platform technology
Published on: February 25, 2019
Efficient and scalable method for scaling up cell free protein synthesis in batch mode
Alexei M Voloshin1, James R Swartz
1Department of Chemical Engineering, Stanford University, Stanford, California 94305-5025, USA.
Biotechnology and Bioengineering
|June 7, 2005
Summary
A new thin film method enhances cell-free protein production scale-up. This novel approach improves yields for E. coli chloramphenicol acetyl transferase (CAT) and a lymphoma vaccine candidate (GLH) across various volumes.
Area of Science:
- Biotechnology
- Molecular Biology
- Protein Expression
Background:
- Cell-free protein synthesis (CFPS) offers advantages for rapid protein production.
- Scaling up CFPS reactions in batch mode presents challenges in maintaining volumetric yields.
- Efficient scale-up methods are crucial for the industrial application of CFPS.
Purpose of the Study:
- To introduce and evaluate a novel thin film method for scaling up batch mode cell-free systems.
- To assess the performance of the scale-up method using two different E. coli-based cell-free systems.
- To determine the impact of the method on the expression of chloramphenicol acetyl transferase (CAT) and a GMCSF-scFv fusion protein (GLH).
Main Methods:
- Applied a novel thin film batch mode scale-up method to E. coli-based cell-free systems.
- Tested reaction volumes ranging from 15 to 500 microL for CAT and GLH protein expression.
- Compared protein yields obtained with the thin film method against traditional test tube reactions.
Main Results:
- The thin film scale-up method consistently preserved total, soluble, and active volumetric yields for both CAT and GLH.
- At 500 microL, the PANOx SP system achieved significantly higher active CAT (560 microg/mL) and GLH (99 microg/mL) yields compared to test tubes (250 microg/mL and 72 microg/mL).
- The Cytomim system also showed substantial improvements with the thin film method, yielding 481 microg/mL active CAT and 109 microg/mL active GLH versus 29 microg/mL and 5 microg/mL in test tubes.
Conclusions:
- The novel thin film approach is a generalizable scale-up technology for cell-free protein synthesis.
- Improved oxygen supply and increased hydrophobic surface availability contribute to enhanced protein expression and folding.
- This method is suitable for various protein targets, cell-free systems, and reaction volumes, facilitating broader application of CFPS.
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