A phosphorylation-controlled switch confers cell cycle-dependent protein relocalization

Area of Science:

• Cell Biology
• Molecular Biology
• Biochemistry

Background:

• Protein localization studies are crucial for understanding cell function.
• Existing tools for manipulating protein localization often rely on exogenous triggers, which can perturb sensitive cellular processes like mitosis.
• Mitosis is a complex, highly regulated process sensitive to external stimuli.

Purpose of the Study:

• To develop a novel system for mitosis-specific protein recruitment to the plasma membrane.
• To overcome the limitations of exogenous triggers in studying mitosis.
• To enable precise spatiotemporal manipulation of protein function during cell division.

Main Methods:

• Exploited a phosphorylation-controlled, cell cycle-dependent localization of the adaptor protein PLEKHA5.
• Engineered a 15 kDa module derived from PLEKHA5 for protein recruitment.
• Utilized direct fusion or GFP-GFP nanobody interaction for cargo recruitment.
• Developed a mitosis-enabled anchor-away/recruiter system.

Main Results:

• Successfully developed a system for mitosis-specific protein recruitment to the plasma membrane.
• The system requires no exogenous stimulus, avoiding interference with cell physiology.
• Demonstrated applications including 'knock sideways' to remove proteins during mitosis and conditional recruitment of enzymes to alter lipid content.

Conclusions:

• The mitosis-enabled anchor-away/recruiter system provides a powerful, non-perturbative tool for studying mitosis.
• This system allows for precise temporal control of protein function during cell division.
• Facilitates research into mitosis-specific protein functions and cellular processes without exogenous interference.