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Proc Natl Acad Sci U S A. 2005 Dec 13;102(50):17981-6. Epub 2005 Dec 5.

A genome-wide visual screen reveals a role for sphingolipids and ergosterol in cell surface delivery in yeast.

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  • 1Max Planck Institute of Molecular Cell Biology and Genetics, Dresden, Germany.

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.

PMID:
16330752
[PubMed - indexed for MEDLINE]
PMCID:
PMC1312417
Free PMC Article

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