Dual transcriptional-translational cascade permits cellular level tuneable expression control

Area of Science:

• Synthetic Biology
• Molecular Biology
• Biotechnology

Background:

• Gene expression control is crucial for applications like target discovery and bio-production.
• Current methods rely on limited protein-based transcriptional control.
• Riboswitches offer an alternative gene expression regulation mechanism.

Purpose of the Study:

• To develop and characterize a novel tunable recombinant expression system.
• To establish a multi-layered genetic control circuit for precise gene expression regulation.
• To enhance recombinant protein production in E. coli.

Main Methods:

• Development of the RiboTite system, a tunable recombinant expression system.
• Utilizing standard inducible promoters and orthogonal riboswitches.
• Constructing a multi-layered modular genetic control circuit for bacteriophage T7 RNA polymerase and recombinant gene expression.

Main Results:

• RiboTite demonstrates tight basal control and precise analog tunability of gene expression.
• The system allows dose-dependent regulation of protein production rates over extended periods.
• Enhanced cell viability and improved performance compared to common E. coli expression systems were observed.

Conclusions:

• The RiboTite system provides a novel, high-performance E. coli expression platform.
• It expands the available tools for recombinant protein production.
• The system offers enhanced control and tunability at both transcriptional and translational levels.