Abstract:
:Clathrin/adaptor protein-1-coated carriers connect the secretory and the endocytic pathways. Carrier biogenesis relies on distinct protein networks changing membrane shape at the trans-Golgi network, each regulating coat assembly, F-actin-based mechanical forces, or the biophysical properties of lipid bilayers. How these different hubs are spatiotemporally coordinated remains largely unknown. Using in vitro reconstitution systems, quantitative proteomics, and lipidomics, as well as in vivo cell-based assays, we characterize the protein networks controlling membrane lipid composition, membrane shape, and carrier scission. These include PIP5K1A and phospholipase C-beta 3 controlling the conversion of PI[4]P into diacylglycerol. PIP5K1A binding to RAC1 provides a link to F-actin-based mechanical forces needed to tubulate membranes. Tubular membranes then recruit the BAR-domain-containing arfaptin-1/2 guiding carrier scission. These findings provide a framework for synchronizing the chemical/biophysical properties of lipid bilayers, F-actin-based mechanical forces, and the activity of proteins sensing membrane shape during clathrin/adaptor protein-1-coated carrier biogenesis.
journal_name
Cell Repjournal_title
Cell reportsauthors
Anitei M,Stange C,Czupalla C,Niehage C,Schuhmann K,Sala P,Czogalla A,Pursche T,Coskun Ü,Shevchenko A,Hoflack Bdoi
10.1016/j.celrep.2017.08.013subject
Has Abstractpub_date
2017-08-29 00:00:00pages
2087-2099issue
9issn
2211-1247pii
S2211-1247(17)31105-1journal_volume
20pub_type
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