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• W2149451120 abstract "Membrane fusion is a process that intimately involves both proteins and lipids. Although the SNARE proteins, which ultimately overcome the energy barrier for fusion, have been extensively studied, regulation of the energy barrier itself, determined by specific membrane lipids, has been largely overlooked. Our findings reveal a novel function for SNARE proteins in reducing the energy barrier for fusion, by directly binding and sequestering fusogenic lipids to sites of fusion. We demonstrate a specific interaction between Syntaxin1A and the fusogenic lipid phosphatidic acid, in addition to multiple polyphosphoinositide lipids, and define a polybasic juxtamembrane region within Syntaxin1A as its lipid-binding domain. In PC-12 cells, Syntaxin1A mutations that progressively reduced lipid binding resulted in a progressive reduction in evoked secretion. Moreover, amperometric analysis of fusion events driven by a lipid-binding–deficient Syntaxin1A mutant (5RK/A) demonstrated alterations in fusion pore dynamics, suggestive of an energetic defect in secretion. Overexpression of the phosphatidic acid–generating enzyme, phospholipase D1, completely rescued the secretory defect seen with the 5RK/A mutant. Moreover, knockdown of phospholipase D1 activity drastically reduced control secretion, while leaving 5RK/A-mediated secretion relatively unaffected. Altogether, these data suggest that Syntaxin1A–lipid interactions are a critical determinant of the energetics of SNARE-catalyzed fusion events." @default.
• W2149451120 created "2016-06-24" @default.
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• W2149451120 date "2008-02-01" @default.
• W2149451120 modified "2023-10-17" @default.
• W2149451120 title "SNARE-catalyzed Fusion Events Are Regulated by Syntaxin1A–Lipid Interactions" @default.
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• W2149451120 doi "https://doi.org/10.1091/mbc.e07-02-0148" @default.
• W2149451120 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2230580" @default.
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