A tunable and reversible thermo-inducible bio-switch for streptomycetes

Area of Science:

• Microbiology
• Synthetic Biology
• Biotechnology

Background:

• Bacterial gene expression control is crucial for research and industry.
• Streptomyces are vital for natural product biosynthesis, necessitating advanced genetic tools.
• Existing inducible systems for Streptomyces require expansion with high-performance options.

Purpose of the Study:

• To develop a robust and reversible thermo-inducible bio-switch for Streptomyces.
• To enable tunable gene expression control using physiological temperature stimuli.
• To demonstrate the bio-switch's utility in genome engineering and natural product synthesis.

Main Methods:

• Design and implementation of a novel temperature-sensing module (StrepT-switch).
• Application of StrepT-switch for CRISPR/Cas9-mediated genome engineering.
• Utilizing StrepT-switch for controlling antibiotic production and morphological differentiation.

Main Results:

• The StrepT-switch provides efficient, tunable, and reversible control of gene expression.
• Successful application in CRISPR/Cas9 genome engineering in Streptomyces.
• Demonstrated programmable control over antibiotic (e.g., actinorhodin) production and cell differentiation.
• Validated thermal induction of ZouA for enhanced actinorhodin overproduction.

Conclusions:

• StrepT-switch is a versatile and effective tool for programmable gene expression in Streptomyces.
• This bio-switch expands the genetic engineering toolkit for Streptomyces species.
• The temperature-sensing module offers a novel approach for controlling complex biological processes.