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- W2746289009 abstract "Abstract Uptake of large volumes of extracellular fluid by actin-dependent macropinocytosis plays important roles in infection, immunity and cancer development. A key question is how large macropinosomes are able to squeeze through the dense actin network underlying the plasma membrane in order to move towards the cell centre for maturation. Here we show that, immediately after macropinosomes have been sealed off from the plasma membrane, the PH-and FYVE domain-containing protein Phafin2 is recruited by a mechanism that involves binding to phosphatidylinositol 3-phosphate (PtdIns3P) generated in a non-canonical manner. Phafin2 in turn regulates the actin cross-linking protein Filamin A to promote entry of macropinosomes through the subcortical actin matrix and subsequent maturation. Depletion of Phafin2 inhibits macropinocytic internalization and maturation. We conclude that PtdIns3P and its effector Phafin2 are key components of a system that allows nascent macropinosomes to navigate through the dense subcortical actin network." @default.
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- W2746289009 date "2017-08-25" @default.
- W2746289009 modified "2023-10-16" @default.
- W2746289009 title "The PtdIns3P-binding protein Phafin2 escorts macropinosomes through the cortical actin cytoskeleton" @default.
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- W2746289009 doi "https://doi.org/10.1101/180760" @default.
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