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- W2079789747 abstract "Munc18-1 plays a crucial role in regulated exocytosis in neurons and neuroendocrine cells through modulation of vesicle docking and membrane fusion. The molecular basis for Munc18 function is still unclear, as are the links with Rabs and SNARE [SNAP (soluble N-ethylmaleimide-sensitive factor-attachment protein) receptor] proteins that are also required. Munc18-1 can bind to SNAREs through at least three modes of interaction, including binding to the closed conformation of syntaxin 1. Using a gain-of-function mutant of Munc18-1 (E466K), which is based on a mutation in the related yeast protein Sly1p, we have identified a direct interaction of Munc18-1 with Rab3A, which is increased by the mutation. Expression of Munc18-1 with the E466K mutation increased exocytosis in adrenal chromaffin cells and PC12 cells (pheochromocytoma cells) and was found to increase the density of secretory granules at the periphery of PC12 cells, suggesting a stimulatory effect on granule recruitment through docking or tethering. Both the increase in exocytosis and changes in granule distribution appear to require Munc18-1 E466K binding to the closed form of syntaxin 1, suggesting a role for this interaction in bridging Rab- and SNARE-mediated events in exocytosis." @default.
- W2079789747 created "2016-06-24" @default.
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- W2079789747 date "2007-12-21" @default.
- W2079789747 modified "2023-10-16" @default.
- W2079789747 title "A gain-of-function mutant of Munc18-1 stimulates secretory granule recruitment and exocytosis and reveals a direct interaction of Munc18-1 with Rab3" @default.
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- W2079789747 doi "https://doi.org/10.1042/bj20071094" @default.
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