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- W3049546120 abstract "Abstract Upon Ca2+ influx, synaptic vesicles fuse with the presynaptic plasma membrane (PM) to release neurotransmitters. Membrane fusion is triggered by synaptotagmin-1, a transmembrane protein in the vesicle membrane (VM), but the mechanism is under debate. Synaptotagmin-1 contains a single transmembrane helix (TM) and two tandem C2 domains (C2A and C2B). This study aimed to use molecular dynamics simulations to elucidate how Ca2+-bound synaptotagmin-1, by simultaneously associating with VM and PM, brings them together for fusion. Although C2A stably associates with VM via two Ca2+-binding loops, C2B has a propensity to partially dissociate. Importantly, an acidic motif in the TM-C2A linker competes with VM for interacting with C2B, thereby flipping its orientation to face PM. Subsequently, C2B readily associates with PM via a polybasic cluster and a Ca2+-binding loop. The resulting mechanistic model for the triggering of membrane fusion by synaptotagmin-1 reconciles many experimental observations." @default.
- W3049546120 created "2020-08-21" @default.
- W3049546120 creator A5073951064 @default.
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- W3049546120 date "2020-09-01" @default.
- W3049546120 modified "2023-10-14" @default.
- W3049546120 title "Membrane Association and Functional Mechanism of Synaptotagmin-1 in Triggering Vesicle Fusion" @default.
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- W3049546120 doi "https://doi.org/10.1016/j.bpj.2020.08.008" @default.
- W3049546120 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7499113" @default.
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