▪ Abstract Synaptic vesicle exocytosis occurs in consecutive steps: docking, which specifically attaches vesicles to the active zone; priming, which makes the vesicles competent for Ca 2+ -triggered release and may involve a partial fusion reaction; and the final Ca 2+ -regulated step that completes fusion. Recent evidence suggests that the critical regulation of the last step in the reaction is mediated by two proteins with opposite actions: synaptotagmin, a Ca 2+ -binding protein that is essential for Ca 2+ -triggered release and probably serves as the Ca 2+ -sensor in fusion, and rab3, which limits the number of vesicles that can be fused as a function of Ca 2+ in order to allow a temporally limited, repeatable signal.
Annual Review of Neuroscience – Annual Reviews
Published: Mar 1, 1998
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