Homotypic vacuole fusion occurs by sequential priming, docking and fusion reactions. Priming frees the HOPS complex (Vps 11, 16, 18, 33, 39 and 41) to activate Ypt7p for docking. Here we explore the roles of the GDP and GTP states of Ypt7p using Gdi1p (which extracts Ypt7:GDP), Gyp7p (a GTPase-activating protein for Ypt7p:GTP), GTPgammaS or GppNHp (non… (More)
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