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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




Journal article



Publication Date





1184 - 1197.e6


clathrin uncoating, endophilin, flash-and-freeze, membrane remodeling, synaptic endosomes, synaptic vesicle endocytosis, synaptic vesicle recycling, synaptojanin, ultrafast endocytosis, Acyltransferases, Adaptor Proteins, Signal Transducing, Animals, Cell Membrane, Clathrin, Clathrin-Coated Vesicles, Endocytosis, Endosomes, Mice, Mice, Knockout, Nerve Tissue Proteins, Neurons, Phosphoric Monoester Hydrolases, Synapses, Synaptic Vesicles, Transport Vesicles