Triggering signaling pathways using F-actin self-organization

Area of Science:

• Cell Biology
• Biophysics
• Biochemistry

Background:

• The spatiotemporal organization of cellular proteins is crucial for cell fate.
• The cytoskeleton's role in shaping and controlling cytoplasmic signaling pathways remains incompletely understood.
• Understanding this interplay is key to deciphering cellular functions.

Purpose of the Study:

• To investigate how F-actin self-organization can trigger and control cellular signaling pathways.
• To engineer novel properties of microfilament self-organization for controlling signaling.
• To establish in vitro models for studying cytoskeleton-signaling interactions.

Main Methods:

• Engineering F-actin self-organization to include protein confinement and scaffolding.
• Utilizing in vitro reconstitutions of cellular functions.
• Employing nanoparticle-based signaling platforms and engineered signaling proteins.
• Investigating Ran-dependent microtubule nucleation.

Main Results:

• Engineered F-actin self-organization, through confinement and scaffolding, can trigger signaling switches.
• F-actin contractility powered nanoparticle-based signaling platforms.
• Scaffolding signaling proteins along actin microfilaments initiated signaling.
• F-actin dynamics were shown to promote robust microtubule assembly.

Conclusions:

• F-actin self-organization is a viable mechanism for controlling signaling pathways in space and time.
• In vitro reconstitution provides a powerful approach to study cytoskeleton-signaling dynamics.
• This work lays the foundation for bottom-up strategies to understand cellular organization and function.