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Actin and fimbrin are required for the internalization step of endocytosis in yeast.
Author(s) -
Kübler E.,
Riezman H.
Publication year - 1993
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1002/j.1460-2075.1993.tb05947.x
Subject(s) - internalization , endocytosis , biology , microbiology and biotechnology , endocytic cycle , actin , vacuole , biochemistry , receptor , cytoplasm
In Saccharomyces cerevisiae, alpha‐factor is internalized by receptor‐mediated endocytosis and transported via vesicular intermediates to the vacuole where the pheromone is degraded. Using beta‐tubulin and actin mutant strains, we showed that actin plays a direct role in receptor‐mediated internalization of alpha‐factor, but is not necessary for transport from the endocytic intermediates to the vacuole. beta‐tubulin mutant strains showed no defect in these processes. In addition, cells lacking the actin‐binding protein, Sac6p, which is the yeast fimbrin homologue, are defective for internalization of alpha‐factor suggesting that actin filament bundling might be required for this step. The actin dependence of endocytosis shows some interesting similarities to endocytosis from the apical membrane in polarized mammalian cells.