Tickets to ride: selecting cargo for clathrin-regulated internalization

Area of Science:

• Cell Biology
• Molecular Biology
• Biochemistry

Background:

• Clathrin-mediated endocytosis (CME) is crucial for internalizing membrane proteins.
• CME regulates the uptake of signaling receptors and ion channels from the cell surface.
• Efficient cargo sorting is essential for proper cellular function.

Purpose of the Study:

• To elucidate the mechanisms of cargo recognition and sorting during CME.
• To understand the role of clathrin adaptors in accommodating diverse transmembrane proteins.
• To investigate how cargo loading influences vesicle budding and coat dynamics.

Main Methods:

• Utilized structural and functional analyses.
• Investigated the plasticity of cargo-selective clathrin adaptors, including AP-2.
• Examined the impact of cargo loading on coat behavior at the plasma membrane.

Main Results:

• Demonstrated remarkable plasticity in how cargo-selective clathrin adaptors recognize diverse sorting signals.
• Showed that cargo loading can determine the fate of clathrin-coated vesicles, preventing abortive dismantling.
• Highlighted the efficiency of the sorting machinery in rapid, non-competitive cargo uptake.

Conclusions:

• The sorting machinery in CME exhibits significant adaptability in cargo recognition.
• Cargo loading plays a critical role in regulating the completion of vesicle formation.
• CME ensures efficient internalization of various transmembrane proteins via dynamic cargo adaptors.