Multiple pathways regulate endocytic coat disassembly in Saccharomyces cerevisiae for optimal downstream trafficking

Area of Science:

• Cell biology
• Molecular and cell biology

Background:

• Endocytosis is a fundamental cellular process involving protein recruitment.
• The dynamics of endocytic coat proteins are critical for efficient cargo internalization.

Purpose of the Study:

• Investigate the roles of candidate disassembly factors in regulating endocytic coat protein dynamics.
• Identify pathways involved in the disassembly of endocytic coat proteins in budding yeast.

Main Methods:

• Live cell imaging of endocytic protein recruitment and dynamics.
• Analysis of protein coat dynamics in various mutant yeast strains.

Main Results:

• Identified Ark1p, Prk1p kinases, Gts1p (Arf GTPase-activating protein), and Lsb5p (Arf GTPase-interacting protein) as late-arriving factors at endocytic sites.
• Demonstrated that multiple pathways, including Arf GTPase and synaptojanin-mediated pathways, facilitate efficient disassembly of endocytic coat proteins.
• Discovered at least four distinct processes are essential for endocytic complex disassembly and cargo trafficking.

Conclusions:

• Multiple regulatory pathways contribute to the disassembly of endocytic coat proteins.
• Efficient disassembly is critical for downstream cargo trafficking in budding yeast endocytosis.
• Findings provide insights into conserved mechanisms of endocytic regulation with implications for mammalian cells.