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Enhancing multiple disulfide bonded protein folding in a cell-free system
1Department of Chemical Engineering, Stanford University, Stanford, California 94305-5025, USA.
Biotechnology and Bioengineering
|March 31, 2004
Summary
Researchers optimized a cell-free protein synthesis system to efficiently produce active recombinant plasminogen activator (PA). Modifications improved protein folding and yield, achieving over 60 microg/mL of bioactive PA in a 3-hour batch reaction.
Area of Science:
- Biochemistry
- Protein Engineering
- Cell-Free Systems
Background:
- Producing complex proteins like plasminogen activator (PA) with multiple disulfide bonds in cell-free systems is challenging due to unstable and reducing environments.
- Initial E. coli-based cell-free systems struggled with efficient disulfide bond formation, limiting active protein yield.
Purpose of the Study:
- To enhance the cell-free synthesis of a recombinant plasminogen activator (PA) protein with nine disulfide bonds.
- To overcome limitations in disulfide bond formation and improve the solubility and yield of bioactive PA.
Main Methods:
- Optimized redox potential by treating cell extract with iodoacetamide and using a glutathione redox buffer.
- Incorporated DsbC, spermidine, putrescine, and Skp chaperone into the cell-free system.
- Expressed PA at 30 degrees C to improve protein folding and solubility.
Main Results:
- Achieved a stabilized redox potential for efficient disulfide bond formation.
- Increased protein solubility and yield of active PA through optimized conditions and chaperone addition.
- Produced over 60 microg/mL of bioactive PA in a 3-hour batch reaction.
Conclusions:
- The modified cell-free system successfully produced high yields of bioactive recombinant plasminogen activator.
- The optimized conditions provide a robust platform for the cell-free synthesis of complex, disulfide-rich proteins.