Light-dependent modulation of protein localization and function in living bacteria cells.

Area of Science:

• Bacterial cell biology
• Optogenetics
• Synthetic biology

Background:

• Bacteria utilize macromolecular scaffolds for protein recruitment due to the absence of membrane-enclosed organelles.
• Controlling protein localization is crucial for understanding and manipulating bacterial cellular functions.

Purpose of the Study:

• To investigate the applicability of the Arabidopsis thaliana CRY2-CIB1 optogenetic system for light-induced protein re-localization in live bacteria.
• To demonstrate the rapid inhibition of bacterial cytokinesis using light-induced protein re-localization.
• To explore the modulation of CRY2-CIBN binding kinetics with green light and test the system in diverse bacterial species.

Main Methods:

• Utilized the CRY2-CIB1 optogenetic system for light-induced protein targeting in Escherichia coli.
• Applied green light to modulate CRY2-CIBN binding kinetics.
• Tested the optogenetic system's efficacy in Bacillus subtilis, Caulobacter crescentus, and Streptococcus pneumoniae.

Main Results:

• Successfully demonstrated light-induced protein re-localization to various subcellular locations (nucleoid, cell pole, membrane, midcell) in E. coli.
• Showed rapid inhibition of cytokinesis in actively dividing E. coli cells via light-induced protein re-localization.
• Confirmed that CRY2-CIBN binding kinetics can be modulated by green light, offering tunable control.

Conclusions:

• The CRY2-CIB1 optogenetic system provides a powerful tool for rapid, light-controlled manipulation of protein localization and cellular processes in bacteria.
• This system offers a new dimension of control for bacterial cell biology research and has broad applicability across different bacterial species.
• Optogenetic control of protein localization presents a versatile approach for studying and engineering bacterial functions.