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Light-Inducible Recombinases for Bacterial Optogenetics.

Michael B Sheets^1,2, Wilson W Wong^1,2, Mary J Dunlop^1,2

¹Department of Biomedical Engineering , Boston University , Boston , Massachusetts 02215 , United States.

ACS Synthetic Biology

|January 22, 2020

Summary

This summary is machine-generated.

Scientists engineered optogenetic recombinases for bacteria using blue light. This breakthrough enables precise, light-controlled DNA modification in *Escherichia coli*, expanding microbial optogenetics.

Keywords:

Cre inducible recombinase optogenetics photoactivation recombinase

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Area of Science:

Microbial genetics
Synthetic biology
Optogenetics

Background:

Optogenetic tools offer programmable control over biological systems, particularly gene expression.
Light-inducible recombinases enable precise spatiotemporal control of DNA modification.
Current optogenetic recombinase technology is primarily limited to eukaryotic systems.

Purpose of the Study:

To develop novel optogenetic recombinases for *Escherichia coli* (bacteria) activated by blue light.
To engineer precise, light-inducible DNA modification tools for microbial applications.
To expand the optogenetic toolbox for bacterial synthetic biology.

Main Methods:

Utilized a split recombinase system fused with blue light-sensitive photodimers (Vivid and Magnet).
Investigated different recombinase types (Cre, Flp) and protein split sites.
Optimized the system for blue light responsiveness and minimal ambient light sensitivity.

Main Results:

Developed functional optogenetic recombinases for *Escherichia coli* that activate upon blue light exposure.
Identified an optimal configuration (Opto-Cre-Vvd) demonstrating strong blue light-induced DNA excision.
Characterized the influence of light intensity and temporal dynamics on recombination efficiency.

Conclusions:

Successfully engineered blue light-inducible recombinases for use in bacteria.
These tools provide precise spatiotemporal control over DNA excision in *Escherichia coli*.
The developed optogenetic system significantly advances microbial synthetic biology capabilities.