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Phosphatidylinositol 5-phosphate (PtdIns5P … Phosphatidylinositol 5-phosphate (PtdIns5P) is a phosphoinositide, one of the phosphorylated derivatives of phosphatidylinositol (PtdIns), that are well-established membrane-anchored regulatory molecules. Phosphoinositides participate in signaling events that control cytoskeletal dynamics, intracellular membrane trafficking, cell proliferation and many other cellular functions. Generally, phosphoinositides transduce signals by recruiting specific phosphoinositide-binding proteins to intracellular membranes. Phosphatidylinositol 5-phosphate is one of the 7 known cellular phosphoinositides with less understood functions. It is phosphorylated on position D-5 of the inositol head group, which is attached via phosphodiester linkage to diacylglycerol (with varying chemical composition of the acyl chains, frequently 1-stearoyl-2-arachidonoyl chain). In quiescent cells, on average, PtdIns5P is of similar or higher abundance as compared to PtdIns3P and ~20-100-fold below the levels of PtdIns4P (Phosphatidylinositol 4-phosphate and PtdIns(4,5)P2 (Phosphatidylinositol 4,5-bisphosphate).Notably, steady-state PtdIns5P levels are more than 5-fold higher than those of PtdIns(3,5)P2. PtdIns5P was first demonstrated by HPLC (high pressure liquid chromatography) in mouse fibroblasts as a substrate for PtdIns(4,5)P2 synthesis by type II PIP kinases (1-phosphatidylinositol-5-phosphate 4-kinase). In many cell types, however, PtdIns5P is not detected by HPLC due to technical limitations associated with its poor separation from the abundant PtdIns4P. Rather, PtdIns5P is measured by the "mass assay", where PtdIns5P (as a part of the extracted cellular lipids) is converted in vitro by purified PtdIns5P 4-kinase to PtdIns(4,5)P2 that is subsequently quantified. Based on studies with the mass assay and an improved HPLC technique, PtdIns5P is detected in all studied mammalian cells. Most of the cellular PtdIns5P is found on cytoplasmic membranes whereas a smaller fraction resides in the nucleus. The cytoplasmic and nuclear pools have distinct functions and regulation.ls have distinct functions and regulation.
, Un phosphatidylinositol-5-phosphate (abrég … Un phosphatidylinositol-5-phosphate (abrégé PtdIns(5)P ou PI5P) est l'une des sept classes de phosphoinositides des membranes cellulaires des eucaryotes, c'est-à-dire un dérivé phosphorylé de phosphatidylinositols. Son rôle physiologique est cependant moins bien compris.
* Portail de la chimie
* Portail de la biochimieil de la chimie
* Portail de la biochimie
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Un phosphatidylinositol-5-phosphate (abrég … Un phosphatidylinositol-5-phosphate (abrégé PtdIns(5)P ou PI5P) est l'une des sept classes de phosphoinositides des membranes cellulaires des eucaryotes, c'est-à-dire un dérivé phosphorylé de phosphatidylinositols. Son rôle physiologique est cependant moins bien compris.
* Portail de la chimie
* Portail de la biochimieil de la chimie
* Portail de la biochimie
, Phosphatidylinositol 5-phosphate (PtdIns5P … Phosphatidylinositol 5-phosphate (PtdIns5P) is a phosphoinositide, one of the phosphorylated derivatives of phosphatidylinositol (PtdIns), that are well-established membrane-anchored regulatory molecules. Phosphoinositides participate in signaling events that control cytoskeletal dynamics, intracellular membrane trafficking, cell proliferation and many other cellular functions. Generally, phosphoinositides transduce signals by recruiting specific phosphoinositide-binding proteins to intracellular membranes.nding proteins to intracellular membranes.
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Phosphatidylinositol-5-phosphate
, Phosphatidylinositol 5-phosphate
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