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• W2138879042 abstract "Sterols are essential factors for endocytosis in animals and yeast. To investigate the sterol structural requirements for yeast endocytosis, we created a variety of ergDelta mutants, each accumulating a distinct set of sterols different from ergosterol. Mutant erg2Deltaerg6Delta and erg3Deltaerg6Delta cells exhibit a strong internalization defect of the alpha-factor receptor (Ste2p). Specific sterol structures are necessary for pheromone-dependent receptor hyperphosphorylation, a prerequisite for internalization. The lack of phosphorylation is not due to a defect in Ste2p localization or in ligand-receptor interaction. Contrary to most known endocytic factors, sterols seem to function in internalization independently of actin. Furthermore, sterol structures are required at a postinternalization step of endocytosis. ergDelta cells were able to take up the membrane marker FM4-64, but exhibited defects in FM4-64 movement through endosomal compartments to the vacuole. Therefore, there are at least two roles for sterols in endocytosis. Based on sterol analysis, the sterol structural requirements for these two processes were different, suggesting that sterols may have distinct functions at different places in the endocytic pathway. Interestingly, sterol structures unable to support endocytosis allowed transport of the glycosylphosphatidylinositol-anchored protein Gas1p from the endoplasmic reticulum to Golgi compartment." @default.
• W2138879042 created "2016-06-24" @default.
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• W2138879042 date "2002-08-01" @default.
• W2138879042 modified "2023-09-23" @default.
• W2138879042 title "Multiple Functions of Sterols in Yeast Endocytosis" @default.
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• W2138879042 doi "https://doi.org/10.1091/mbc.e02-04-0186" @default.
• W2138879042 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/117933" @default.
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