The BioGRID | PUBLICATION VIEW

	J. Cell Biol. Jun (2007); 177(6):1091-104
YGR198w (YPP1) targets A30P alpha-synuclein to the vacuole for degradation.
Flower TR, Clark-Dixon C, Metoyer C, Yang H, Shi R, Zhang Z, Witt SN
Department of Biochemistry and Molecular Biology, Louisiana State University Health Sciences Center, Shreveport, LA 71130, USA.
Abstract: Using a genetic screen we discovered that YGR198w (named YPP1), which is an essential Saccharomyces cerevisiae gene of unknown function, suppresses the toxicity of an alpha-synuclein (alpha-syn) mutant (A30P) that is associated with early onset Parkinson's disease. Here, we show that YPP1 suppresses lethality of A30P, but not of wild-type alpha-syn or the A53T mutant. The Ypp1 protein, when overexpressed, drives each of the three alpha-syns into vesicles that bud off the plasma membrane, but only A30P-containing vesicles traffick to and merge with the vacuole, where A30P is proteolytically degraded. We show that Ypp1p binds to A30P but not the other two alpha-syns; that YPP1 interacts with genes involved in endocytosis/actin dynamics (SLA1, SLA2, and END3), protein sorting (class E vps), and vesicle-vacuole fusion (MON1 and CCZ1) to dispose of A30P; and that YPP1 also participates in pheromone-triggered receptor-mediated endocytosis. Our data reveal that YPP1 mediates the trafficking of A30P to the vacuole via the endocytic pathway.
[PUBMED: 17576801]