A modular design for the clathrin- and actin-mediated endocytosis machinery.
摘要：
Endocytosis depends on an extensive network of interacting proteins that execute a series of distinct subprocesses. Previously, we used live-cell imaging of six budding-yeast proteins to define a pathway for association of receptors, adaptors, and actin during endocytic internalization. Here, we analyzed the effects of 61 deletion mutants on the dynamics of this pathway, revealing functions for 15 proteins, and we analyzed the dynamics of 8 of these proteins. Our studies provide evidence for four protein modules that cooperate to drive coat formation, membrane invagination, actin-meshwork assembly, and vesicle scission during clathrin/actin-mediated endocytosis. We found that clathrin facilitates the initiation of endocytic-site assembly but is not needed for membrane invagination or vesicle formation. Finally, we present evidence that the actin-meshwork assembly that drives membrane invagination is nucleated proximally to the plasma membrane, opposite to the orientation observed for previously studied actin-assembly-driven motility processes.
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关键词：
Cell Membrane Clathrin-Coated Vesicles Saccharomyces cerevisiae Microfilament Proteins Actins Carrier Proteins Cytoskeletal Proteins Fungal Proteins Saccharomyces cerevisiae Proteins Membrane Glycoproteins
DOI：
10.1016/j.cell.2005.09.024
被引量：
年份：
2005
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