J. Cell Biol.
© The Rockefeller University Press
0021-9525/97/01/307/11 $2.00
Volume 136, Number 2, January 27, 1997 307-317

Docking of Yeast Vacuoles Is Catalyzed by the Ras-like GTPase Ypt7p after Symmetric Priming by Sec18p (NSF)

Andreas Mayer, and William Wickner

Department of Biochemistry, Dartmouth Medical School, Hanover, New Hampshire 03755-3844

Vacuole inheritance in yeast involves the formation of tubular and vesicular "segregation structures" which migrate into the bud and fuse there to establish the daughter cell vacuole. Vacuole fusion has been reconstituted in vitro and may be used as a model for an NSF-dependent reaction of priming, docking, and fusion. We have developed biochemical and microscopic assays for the docking step of in vitro vacuole fusion and characterized its requirements. The vacuoles must be primed for docking by the action of Sec17p (-SNAP) and Sec18p (NSF). Priming is necessary for both fusion partners. It produces a labile state which requires rapid docking in order to lead productively to fusion. In addition to Sec17p/Sec18p, docking requires the activity of the Ras-like GTPase Ypt7p. Unlike Sec17p/Sec18p, which must act before docking, Ypt7p is directly involved in the docking process itself.

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