Engineering an Optogenetic CRISPRi Platform for Improved Chemical Production.

Area of Science:

• Synthetic Biology
• Metabolic Engineering
• Microbial Biotechnology

Background:

• Microbial chemical synthesis requires redirecting metabolic flux toward desired products.
• Dynamic control strategies offer solutions to optimize metabolic pathways.
• Optogenetics provides spatial and temporal control over cellular processes.

Purpose of the Study:

• To develop and apply an optogenetic-CRISPR interference (opto-CRISPRi) system for dynamic metabolic control in bacteria.
• To enhance heterologous muconic acid synthesis by redirecting metabolic flux.
• To demonstrate the utility of light-inducible systems for microbial chemical production.

Main Methods:

• Utilized a blue light-sensitive protein (EL222) to regulate a dCpf1-mediated CRISPR interference system.
• Applied the opto-CRISPRi system to control gene expression in *Escherichia coli*.
• Dynamically suppressed central metabolism and competing pathways to favor muconic acid production.

Main Results:

• The opto-CRISPRi system successfully regulated metabolic flux in response to optical signals.
• Muconic acid production was increased by 130% through dynamic pathway suppression.
• Demonstrated effective redirection of metabolic resources toward target chemical synthesis.

Conclusions:

• The opto-CRISPRi platform offers an effective method for dynamic control of microbial chemical synthesis.
• This technology has broad applicability for enhancing the production of various chemicals in microbial systems.
• Optogenetic control provides a powerful tool for optimizing metabolic engineering strategies.