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High level recombinant protein expression in Ralstonia eutropha using T7 RNA polymerase based amplification
Gavin C Barnard1, Grant E Henderson, Sriram Srinivasan
1Thayer School of Engineering & Department of Biological Sciences, Dartmouth College, 8000 Cummings Hall, Hanover, NH 03755, USA.
Protein Expression and Purification
|November 24, 2004
Summary
This study developed a novel protein expression system in Ralstonia eutropha, achieving over 10 g/L of active organophosphohydrolase (OPH). This 100-fold increase over E. coli demonstrates a highly efficient system for recombinant protein production.
Area of Science:
- Biotechnology
- Microbial Engineering
- Protein Expression Systems
Background:
- Escherichia coli often forms inclusion bodies with organophosphohydrolase (OPH).
- Ralstonia eutropha offers a novel host for recombinant protein expression.
- High-titer production of active OPH is desirable for industrial applications.
Purpose of the Study:
- To develop a novel recombinant protein expression system in Ralstonia eutropha.
- To achieve high-titer expression of soluble, active organophosphohydrolase (OPH).
- To overcome limitations of OPH expression in Escherichia coli.
Main Methods:
- Engineered Ralstonia eutropha by integrating T7 RNA polymerase under the phaP promoter.
- Introduced the organophosphohydrolase (oph) gene under the T7 promoter via transposon-mediated single-copy chromosomal integration.
- Utilized high cell density fermentation for protein production.
Main Results:
- Achieved soluble and active organophosphohydrolase (OPH) expression in Ralstonia eutropha.
- Obtained OPH titers exceeding 10 g/L.
- Demonstrated approximately 100-fold higher OPH titers compared to previous Escherichia coli systems.
Conclusions:
- Ralstonia eutropha is a viable and efficient host for high-titer recombinant protein expression.
- The developed system successfully produced soluble, active OPH, overcoming inclusion body formation issues.
- This advancement offers a significant improvement for industrial-scale organophosphohydrolase production.