Development of a prokaryotic expression vector that exploits dicistronic gene organization

Area of Science:

• Molecular Biology
• Biotechnology
• Protein Expression

Background:

• Foreign gene expression in Escherichia coli (E. coli) is often undetectable.
• Translation initiation is a critical bottleneck for successful foreign protein production.
• Prokaryotic genes are typically transcribed in a polycistronic form.

Purpose of the Study:

• To develop a new prokaryotic expression system to improve foreign protein production in E. coli.
• To overcome the limitations of undetectable foreign gene expression.
• To facilitate the production of discrete foreign polypeptides.

Main Methods:

• Devised a dicistronic gene organization strategy in E. coli.
• Utilized a strong promoter upstream of the glutathione S-transferase gene.
• Connected various foreign genes via a ribosome-binding site, stop codon, and start codon.

Main Results:

• Successfully produced discrete polypeptides of various foreign genes in E. coli.
• Demonstrated the efficacy of the dicistronic system for protein expression.
• Included examples such as VH domain of immunoglobulin, FK506-binding protein, cyclophilin, and MHC antigen domain.

Conclusions:

• The novel dicistronic gene expression system enhances foreign protein production in E. coli.
• This method overcomes previous challenges with undetectable gene expression.
• The system facilitates the production of discrete, functional foreign proteins.