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A plasmid system for high-level expression and in vitro processing of recombinant proteins
J Pohlner1, J Krämer, T F Meyer
1Max-Planck-Institut für Biologie, Infektionsbiologie, Tübingen, Germany.
Gene
|August 16, 1993
Summary
A new plasmid expression system enables easy purification and processing of fusion proteins in E. coli. This system facilitates the production of functional antibody fragments, advancing recombinant protein technology.
Area of Science:
- Molecular Biology
- Biotechnology
- Protein Engineering
Background:
- Overproduction of recombinant proteins often requires complex purification strategies.
- Efficient processing and assembly of protein domains, like antibody fragments, remain challenging.
Purpose of the Study:
- To develop a novel plasmid expression system for simplified production of fusion proteins.
- To enable single-step affinity purification and specific in vitro processing of overproduced fusion proteins.
Main Methods:
- Construction of a pEV41-based plasmid system in E. coli.
- Utilizing lambda pL promoter and MS2 polymerase translation initiation region for high expression.
- Employing His6 peptide for affinity purification and IgA protease (Igase) for fusion protein processing.
- Demonstrating production of monoclonal antibody variable heavy (VH) and light (VL)-chain domains.
Main Results:
- Achieved high-level expression of gene fusions in E. coli.
- Enabled single-step purification of fusion proteins using His6 affinity tags.
- Demonstrated specific cleavage of fusion proteins with Igase, either in purified form or in culture medium.
- Successfully produced and cross-linked VH and VL domains into functional recombinant antibody Fv fragments.
Conclusions:
- The novel expression system simplifies recombinant fusion protein production and purification.
- The system allows for efficient generation of functional antibody Fv fragments.
- This technology offers a versatile platform for protein engineering and antibody production.