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A Convenient and General Expression Platform for the Production of Secreted Proteins from Human Cells
Published on: July 31, 2012
High-yield, in vitro protein expression using a continuous-exchange, coupled transcription/ translation system
G A Martin1, R Kawaguchi, Y Lam
1Roche Diagnostics, Berkeley, CA, USA. george.martin@roche.com
Biotechniques
|October 30, 2001
Summary
The Rapid Translation System (RTS 500) offers high-yield protein expression for toxic or insoluble proteins. This in vitro system enables continuous expression for over 24 hours, overcoming limitations of cell-based methods.
Area of Science:
- Biochemistry
- Molecular Biology
- Protein Expression
Background:
- Conventional transcription/translation systems have limitations in expressing difficult proteins.
- Cell-based expression systems often struggle with toxic or insoluble protein production.
Purpose of the Study:
- To evaluate the utility of the Rapid Translation System (RTS 500) for high-yield protein expression.
- To demonstrate the system's capability in producing proteins problematic for cell-based systems.
Main Methods:
- Utilized the RTS 500, an in vitro transcription/translation system based on enhanced E. coli lysate.
- Expressed challenging proteins including GFP-lunasin, human interleukin-2 (IL-2), and co-expressed GFP and CAT.
Main Results:
- Successfully expressed toxic GFP-lunasin, which is not producible in whole cells.
- Achieved soluble expression of human interleukin-2 (IL-2), often difficult in bacterial systems.
- Demonstrated co-expression of multiple proteins (GFP and CAT) in a single reaction.
Conclusions:
- The RTS 500 is effective for producing preparative amounts (100-900 µg) of proteins toxic or insoluble in cell-based systems.
- This in vitro technology provides a convenient solution for expressing problematic proteins.
