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Published online 26 March 2002. doi:10.1083/jcb.200112098
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© The Rockefeller University Press, 0021-9525/2002/4/79 $5.00
The Journal of Cell Biology, Volume 157, Number 1, April 1, 2002 79-90

Article

A cycle of Vam7p release from and PtdIns 3-P–dependent rebinding to the yeast vacuole is required for homotypic vacuole fusion



Christine Boeddinghaus1, Alexey J. Merz1,2, Rico Laage1 and Christian Ungermann1

1 Biochemie-Zentrum Heidelberg, University of Heidelberg, 69120 Heidelberg, Germany
2 Dartmouth Medical School, Department of Biochemistry, Hanover, NH 03755

Address correspondence to Christian Ungermann, Biochemie-Zentrum Heidelberg, University of Heidelberg, Im Neuenheimer Feld 328, 69120 Heidelberg, Germany. Tel.: 49-6221-544180. Fax: 49-6221-544366. E-mail: cu2{at}ix.urz.uni-heidelberg.de

Vacuole fusion requires a coordinated cascade of priming, docking, and fusion. SNARE proteins have been implicated in the fusion itself, although their precise role in the cascade remains unclear. We now report that the vacuolar SNAP-23 homologue Vam7p is a mobile element of the SNARE complex, which moves from an initial association with the cis-SNARE complex via a soluble intermediate to the docking site. Soluble Vam7p is specifically recruited to vacuoles and can rescue a fusion reaction poisoned with antibodies to Vam7p. Both the recombinant Vam7p PX domain and a FYVE domain construct of human Hrs block the recruitment of Vam7p and vacuole fusion, demonstrating that phosphatidylinositol 3-phosphate is a primary receptor of Vam7p on vacuoles. We propose that the Vam7p cycle is linked to the availability of a lipid domain on yeast vacuoles, which is essential for coordinating the fusion reaction prior to and beyond docking.

Key Words: vacuole fusion; Vam7p; SNAP-23; SNARE complex; PX domain


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