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Mol. Cell. Biol., 03 1995, 1671-1678, Vol 15, No. 3
K Ekena and TH Stevens
The VPS1 gene of Saccharomyces cerevisiae encodes an 80-kDa GTPase that
associates with Golgi membranes and is required for the sorting of proteins
to the yeast vacuole. Vps1p is a member of a growing family of
high-molecular-weight GTPases that are found in a number of organisms and
are involved in a variety of cellular processes. Vps1p is most similar to
mammalian dynamin and the Drosophila Shibire protein, both of which have
been shown to play a role in an early step of endocytosis. To identify
proteins that interact with Vps1p, a genetic screen was designed to isolate
multicopy suppressors of dominant- negative vps1 mutations. One such
suppressor, MVP1, that exhibits genetic interaction with VPS1 and is itself
required for vacuolar protein sorting has been isolated. Overproduction of
Mvp1p will suppress several dominant alleles of VPS1, and suppression is
dependent on the presence of wild-type Vps1p. MVP1 encodes a 59-kDa
hydrophilic protein, Mvp1p, which appears to colocalize with Vps1p in vps1d
and vps27 delta yeast cells. We therefore propose that Mvp1p and Vps1p act
in concert to promote membrane traffic to the vacuole.
Copyright © 1995, American Society for Microbiology
The Saccharomyces cerevisiae MVP1 gene interacts with VPS1 and is required for vacuolar protein sorting
Institute of Molecular Biology, University of Oregon, Eugene 97403.
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