Induced Dimerization Tools to Deplete Specific Phosphatidylinositol Phosphates.

Area of Science:

• Cell biology
• Biochemistry
• Molecular biology

Background:

• Polyphosphoinositides (PPIns) are crucial signaling lipids involved in various cellular processes.
• Existing methods for studying PPIns often lack temporal or spatial precision.
• Acute depletion of PPIns is essential for understanding their dynamic cellular roles.

Purpose of the Study:

• To provide detailed protocols for inducing and monitoring the depletion of all seven PPIns in live cells.
• To leverage chemical dimerization systems for precise control over PPIns metabolism.
• To enable real-time investigation of PPIns function through controlled enzymatic degradation.

Main Methods:

• Utilizing chemical dimerization systems to induce the subcellular localization of PPIns-catabolizing enzymes.
• Employing specific recruiter proteins for targeted enzyme recruitment.
• Administering dimerizer agents for rapid induction of enzyme activity.
• Monitoring PPIns levels in real-time within living cells.

Main Results:

• Demonstrated the ability to acutely deplete all seven types of PPIns in living cells.
• Achieved high spatial and temporal resolution in PPIns depletion.
• Showcased minimal cellular perturbation due to rapid agent permeation and specific protein expression.

Conclusions:

• Chemical dimerization provides a powerful tool for the precise and rapid depletion of polyphosphoinositides in live cells.
• This methodology facilitates real-time studies of PPIns function and signaling.
• The described protocols enable researchers to effectively manipulate and observe PPIns dynamics with high fidelity.