Systematic Nanoscale Analysis of Endocytosis Links Efficient Vesicle Formation to Patterned Actin Nucleation.

Authors:
Serge Dmitrieff
Serge Dmitrieff
European Molecular Biology Laboratory
Philipp Hoess
Philipp Hoess
European Molecular Biology Laboratory (EMBL)
Andrea Picco
Andrea Picco
Institute for Cancer Research and Treatment
Italy

Cell 2018 Aug 26;174(4):884-896.e17. Epub 2018 Jul 26.

Cell Biology and Biophysics Unit, European Molecular Biology Laboratory (EMBL), Meyerhofstrasse 1, 69117 Heidelberg, Germany. Electronic address:

Clathrin-mediated endocytosis is an essential cellular function in all eukaryotes that is driven by a self-assembled macromolecular machine of over 50 different proteins in tens to hundreds of copies. How these proteins are organized to produce endocytic vesicles with high precision and efficiency is not understood. Here, we developed high-throughput superresolution microscopy to reconstruct the nanoscale structural organization of 23 endocytic proteins from over 100,000 endocytic sites in yeast. We found that proteins assemble by radially ordered recruitment according to function. WASP family proteins form a circular nanoscale template on the membrane to spatially control actin nucleation during vesicle formation. Mathematical modeling of actin polymerization showed that this WASP nano-template optimizes force generation for membrane invagination and substantially increases the efficiency of endocytosis. Such nanoscale pre-patterning of actin nucleation may represent a general design principle for directional force generation in membrane remodeling processes such as during cell migration and division.

Abstract Video

Model of actin nucleation during endocytosis


Source: Cell Press

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http://dx.doi.org/10.1016/j.cell.2018.06.032DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6086932PMC

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August 2018
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