Fine-Tuning Protein Self-Organization by Orthogonal Chemo-Optogenetic Tools

Area of Science:

• Synthetic Biology
• Biochemistry
• Microbiology

Background:

• Controlling protein activity spatiotemporally is crucial for in vitro biological system reconstitution.
• The bacterial cell division protein FtsZ is key for forming the division ring.
• Understanding FtsZ self-organization mechanisms is vital for bacterial cell biology.

Purpose of the Study:

• To develop a universal gain-of-function approach for spatiotemporal protein control.
• To elucidate the molecular mechanisms governing FtsZ self-organization using this novel method.
• To investigate the role of specific tyrosine residues in FtsZ function and dynamics.

Main Methods:

• Utilized orthogonal translation with a photocaged amino acid for site-specific modification of FtsZ.
• Incorporated a photocaged tyrosine analogue to mask a specific tyrosine residue.
• Employed UV-mediated uncaging to restore protein activity and observe dynamic changes.

Main Results:

• The modified FtsZ mutant retained self-assembly into filaments but lost dynamic ring formation.
• UV uncaging restored FtsZ activity, demonstrating the light-inducible nature of the system.
• Tyrosine 222 was identified as essential for regulating FtsZ GTPase activity, self-organization, and treadmilling dynamics.

Conclusions:

• Light-mediated control of protein activity offers a promising strategy for building complex biological modules.
• This approach facilitates the study of protein dynamics and molecular mechanisms in vitro.
• The findings contribute to the development of minimal cell systems and synthetic biology.