Differential requirements for actin during yeast and mammalian endocytosis.

Key features of clathrin-mediated endocytosis have been conserved across evolution. However, endocytosis in Saccharomyces cerevisiae is completely dependent on a functional actin cytoskeleton, whereas actin appears to be less critical in mammalian cell endocytosis. We reveal that the fundamental requirement for actin in the early stages of yeast endocytosis is ...
to provide a strong framework to support the force generation needed to direct the invaginating plasma membrane into the cell against turgor pressure. By providing osmotic support, pressure differences across the plasma membrane were removed and this reduced the requirement for actin-bundling proteins in normal endocytosis. Conversely, increased turgor pressure in specific yeast mutants correlated with a decreased rate of endocytic patch invagination.
Mesh Terms:
Actins, Animals, Endocytosis, Green Fluorescent Proteins, Humans, Microfilament Proteins, Microscopy, Fluorescence, Models, Biological, Mutation, Osmotic Pressure, Recombinant Fusion Proteins, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Transformation, Genetic
Nat. Cell Biol.
Date: Aug. 01, 2009
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