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Ultrafast endocytosis generates vesicles from the plasma membrane as quickly as 50 ms in hippocampal neurons following synaptic vesicle fusion. The molecular mechanism underlying the rapid maturation of these endocytic pits is not known. Here we demonstrate that synaptojanin-1, and its partner endophilin-A, function in ultrafast endocytosis. In the absence of synaptojanin or endophilin, the membrane is rapidly invaginated, but pits do not become constricted at the base. The 5-phosphatase activity of synaptojanin is involved in formation of the neck, but 4-phosphatase is not required. Nevertheless, these pits are eventually cleaved into vesicles; within a 30-s interval, synaptic endosomes form and are resolved by clathrin-mediated budding. Then synaptojanin and endophilin function at a second step to aid with the removal of clathrin coats from the regenerated vesicles. These data together suggest that synaptojanin and endophilin can mediate membrane remodeling on a millisecond timescale during ultrafast endocytosis.

Original publication

DOI

10.1016/j.neuron.2018.06.005

Type

Journal article

Journal

Neuron

Publication Date

06/2018

Volume

98

Pages

1184 - 1197.e6

Addresses

Department of Neurophysiology, NeuroCure Cluster of Excellence, Charité-Universitätsmedizin Berlin, Berlin, Germany; Department of Cell Biology, Johns Hopkins University, School of Medicine, Baltimore, MD 21205, USA; Solomon H. Snyder Department of Neuroscience, Johns Hopkins University, School of Medicine, Baltimore, MD 21205, USA. Electronic address: shigeki.watanabe@jhmi.edu.

Keywords

Neurons, Synapses, Synaptic Vesicles, Cell Membrane, Endosomes, Transport Vesicles, Clathrin-Coated Vesicles, Animals, Mice, Knockout, Mice, Phosphoric Monoester Hydrolases, Acyltransferases, Adaptor Proteins, Signal Transducing, Clathrin, Nerve Tissue Proteins, Endocytosis