Bacterial expression systems for recombinant protein production: E. coli and beyond.

Area of Science:

• Biotechnology
• Molecular Biology
• Microbial Expression Systems

Background:

• Escherichia coli remains the dominant bacterial expression system for research and commercial development.
• Existing E. coli systems have limitations that necessitate ongoing innovation.
• Alternative bacterial platforms are emerging as viable options for protein expression.

Purpose of the Study:

• To review recent advancements in overcoming the limitations of Escherichia coli expression systems.
• To highlight the progress and potential of alternative bacterial expression systems.
• To provide an overview of current trends in bacterial protein production.

Main Methods:

• Review of literature on bacterial expression systems.
• Analysis of new developments in E. coli expression technology, including selection methods and protein modification.
• Evaluation of alternative systems such as Lactococcus lactis, Pseudomonas, Streptomyces, and others.

Main Results:

• Escherichia coli system improvements include antibiotics-free selection, extracellular production, and enhanced posttranslational modifications, enabling glycosylated protein production.
• Lactococcus lactis shows viability for membrane protein expression.
• Pseudomonas systems achieve titers comparable to E. coli.
• Other systems like Streptomyces offer advantages for recalcitrant proteins.

Conclusions:

• Advancements continue to expand the utility of Escherichia coli for protein expression.
• Alternative bacterial systems provide valuable options for specific protein targets and challenges.
• The diversity of bacterial expression platforms offers increased flexibility for researchers and industry.