Engineering Spatial Control of Bacterial Organelles

Area of Science:

• Synthetic biology
• Microbiology
• Biochemistry

Background:

• Bacteria were traditionally thought to lack organelles.
• It is now understood that bacteria utilize protein- and membrane-based compartments for cellular reactions.
• The spatial organization and engineering of these bacterial compartments remain key research questions.

Purpose of the Study:

• To investigate the engineering of bacterial organelle positioning.
• To determine if the McdAB protein system can provide programmable spatial control over diverse organelles in E. coli.
• To establish a new design principle for synthetic biology applications.

Main Methods:

• Utilized the McdAB protein system from autotrophic bacteria.
• Repurposed McdAB to position carboxysomes (CO2-fixing organelles) in E. coli.
• Tested McdAB's ability to organize other bacterial organelles, including encapsulins, biomolecular condensates, and membrane-bound organelles.

Main Results:

• McdAB successfully restored assembly and positioning of heterologously expressed carboxysomes in E. coli.
• The McdAB system was reprogrammed to spatially organize various other bacterial organelles.
• Demonstrated programmable spatial control over diverse organelle types within E. coli.

Conclusions:

• The McdAB system offers a versatile tool for programmable spatial organization of bacterial organelles.
• This work establishes a new design principle in synthetic biology, enabling tunable reaction localization.
• The findings pave the way for developing more efficient biocatalysis in engineered microbes.