Vps1, a recycling factor for the traffic from early endosome to the late Golgi.

Recycling of cellular membranes and their constituents plays a role for cell survival and growth. In the budding yeast, there are recycling traffics from early and late endosomal compartments to the late Golgi. Here, we examined a possible role for Vps1, a large GTPase, in the recycling traffic of GFP-Snc1 ...
from early endosomes to the late Golgi. In the absence of Vps1 we observed an aberrant accumulation of GFP-Snc1 puncta in the cytoplasm that we identified as early endosomes. The N-terminal GTPase and the C-terminal GED domains of Vps1 are essential for Vps1's function in Snc1 recycling. Our finding of genetic interactions of VPS1 with genes involved in early endosome-to-Golgi traffic further suggests Vps1 functions as a recycling factor in the membrane traffic. Finally, we provide evidence that the severe accumulation of GFP-Snc1 cytoplasmic puncta in vps1Δ cells is attributed to a mild defect in the retention of the GARP component Vps51 at the late Golgi, as well as a severe disruption of actin cables.
Mesh Terms:
Actins, Biological Transport, Cell Membrane, Endocytosis, Endosomes, GTP-Binding Proteins, Gene Expression Regulation, Fungal, Genes, Reporter, Golgi Apparatus, Green Fluorescent Proteins, Protein Structure, Tertiary, R-SNARE Proteins, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Signal Transduction, Vesicular Transport Proteins
Biochem. Cell Biol.
Date: Dec. 01, 2013
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