Protein Translocation Control in E. coli via Temperature-Dependent Aggregation: Application to a Conditionally Lethal...

Area of Science:

• Synthetic Biology
• Protein Engineering
• Biotechnology

Background:

• Precise control of protein translocation is vital for advancing synthetic biology and protein engineering.
• Developing controllable systems for protein localization and secretion is a key challenge.

Purpose of the Study:

• To develop a temperature-responsive system for regulating protein translocation in Escherichia coli.
• To utilize elastin-like polypeptides (ELPs) for controlling the secretion of a conditionally lethal enzyme.

Main Methods:

• Engineered a fusion protein comprising levansucrase, a signal peptide, and an ELP tag.
• Investigated protein behavior and secretion at different temperatures (37 °C and 16 °C).
• Assessed host cell survival and enzyme activity based on secretion.

Main Results:

• At 37 °C, ELP-mediated aggregation prevented enzyme secretion, ensuring cell survival.
• At 16 °C, ELP remained soluble, allowing enzyme secretion and subsequent host cell death in the presence of sucrose.
• Demonstrated reversible control over protein localization and secretion.

Conclusions:

• ELP-mediated aggregation offers a tunable and reversible strategy for regulating protein localization and secretion in E. coli.
• This system has potential applications in synthetic biology, metabolic engineering, and biocontainment.
• Highlights the utility of ELPs in controlling protein behavior for biotechnological purposes.