1. A genome-wide visual screen reveals a role for sphingolipids and ergosterol in cell surface delivery in yeast.
- Author
-
Proszynski TJ, Klemm RW, Gravert M, Hsu PP, Gloor Y, Wagner J, Kozak K, Grabner H, Walzer K, Bagnat M, Simons K, and Walch-Solimena C
- Subjects
- Biological Transport genetics, Biological Transport physiology, Calcium-Binding Proteins genetics, DNA Mutational Analysis, Gene Library, Green Fluorescent Proteins, Intracellular Signaling Peptides and Proteins, Membrane Glycoproteins, Membrane Proteins genetics, Mutant Chimeric Proteins genetics, Mutant Chimeric Proteins metabolism, Phenotype, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins genetics, Transport Vesicles metabolism, Vesicular Transport Proteins genetics, Calcium-Binding Proteins metabolism, Ergosterol biosynthesis, Genes, Fungal genetics, Membrane Proteins metabolism, Saccharomyces cerevisiae Proteins metabolism, Sphingolipids biosynthesis, Vesicular Transport Proteins metabolism, trans-Golgi Network metabolism
- Abstract
Recently synthesized proteins are sorted at the trans-Golgi network into specialized routes for exocytosis. Surprisingly little is known about the underlying molecular machinery. Here, we present a visual screen to search for proteins involved in cargo sorting and vesicle formation. We expressed a GFP-tagged plasma membrane protein in the yeast deletion library and identified mutants with altered marker localization. This screen revealed a requirement of several enzymes regulating the synthesis of sphingolipids and ergosterol in the correct and efficient delivery of the marker protein to the cell surface. Additionally, we identified mutants regulating the actin cytoskeleton (Rvs161p and Vrp1p), known membrane traffic regulators (Kes1p and Chs5p), and several unknown genes. This visual screening method can now be used for different cargo proteins to search in a genome-wide fashion for machinery involved in post-Golgi sorting.
- Published
- 2005
- Full Text
- View/download PDF