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• W4225540737 startingPage "119" @default.
• W4225540737 abstract "The distinct movements of macropinosome formation and maturation have corresponding biochemical activities which occur in a defined sequence of stages and transitions between those stages. Each stage in the process is regulated by variously phosphorylated derivatives of phosphatidylinositol (PtdIns) which reside in the cytoplasmic face of the membrane lipid bilayer. PtdIns derivatives phosphorylated at the 3’ position of the inositol moiety, called 3’ phosphoinositides (3’PIs), regulate different stages of the sequence. 3’PIs are synthesized by numerous phosphoinositide 3’-kinases (PI3K) and other lipid kinases and phosphatases, which are themselves regulated by small GTPases of the Ras superfamily. The combined actions of these enzymes localize four principal species of 3’PI to distinct domains of the plasma membrane or to discrete organelles, with distinct biochemical activities confined to those domains. Phosphatidylinositol (3,4,5)-trisphosphate (PtdIns(3,4,5)P3) and phosphatidylinositol (3,4)-bisphosphate (PtdIns(3,4)P2) regulate the early stages of macropinosome formation, which include cell surface ruffling and constrictions of circular ruffles which close into macropinosomes. Phosphatidylinositol 3-phosphate (PtdIns3P) regulates macropinosome fusion with other macropinosomes and early endocytic organelles. Phosphatidylinositol (3,5)-bisphosphate (PtdIns(3,5)P2) mediates macropinosome maturation and shrinkage, through loss of ions and water, and subsequent traffic to lysosomes. The different characteristic rates of macropinocytosis in different cell types indicate levels of regulation which may be governed by the cell’s capacity to generate 3’PIs." @default.
• W4225540737 created "2022-05-05" @default.
• W4225540737 creator A5036726875 @default.
• W4225540737 creator A5055543052 @default.
• W4225540737 date "2022-01-01" @default.
• W4225540737 modified "2023-10-06" @default.
• W4225540737 title "Roles for 3’ Phosphoinositides in Macropinocytosis" @default.
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