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• W2131194303 abstract "Annexin 2 is a Ca2+-regulated membrane protein and an F-actin-binding protein enriched at actin assembly sites both, on the plasma membrane and on endosomal vesicles. Here, we identify annexin 2 as a phosphatidylinositol (4,5)-bisphosphate (PtdIns(4,5)P2)-interacting protein, thereby explaining this specific membrane association. Using the pleckstrin-homology (PH) domain of phospholipase Cδ1 fused to yellow fluorescent protein as a marker for PtdIns(4,5)P2, we show that annexin 2 and its ligand p11 (S100A10) are targeted to sites of PtdIns(4,5)P2 enrichment where F-actin accumulates. At the plasma membrane, adhesion of pedestal-forming enteropathogenic Escherichia coli induces a recruitment of 1-phosphatidylinositol-4-phosphate 5-kinase (PtdIns4P 5-kinase) and an enrichment of PtdIns(4,5)P2 and annexin 2-p11 at sites of bacterial adhesion. Induction of PtdIns(4,5)P2-enriched ruffles and PtdIns(4,5)P2-positive, actin-coated vacuoles by Arf6-mediated activation of PtdIns4P 5-kinase also leads to a concomitant accumulation of the annexin 2-p11 complex and the PH domain. Binding studies with immobilized phosphoinositides and phosphoinositide-containing liposomes reveal that the purified annexin 2-p11 complex directly and specifically binds to PtdIns(4,5)P2 with an affinity comparable to that of the PH domain of phospholipase Cδ1. Experiments using individual subunits identify annexin 2 as the PtdIns(4,5)P2-binding entity. Thus, the direct interaction of annexin 2 with PtdIns(4,5)P2 is a means of specifically recruiting the annexin 2-p11 complex to sites of membrane-associated actin assembly." @default.
• W2131194303 created "2016-06-24" @default.
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• W2131194303 date "2004-07-15" @default.
• W2131194303 modified "2023-10-14" @default.
• W2131194303 title "Annexin 2 is a phosphatidylinositol (4,5)-bisphosphate binding protein recruited to actin assembly sites at cellular membranes" @default.
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• W2131194303 doi "https://doi.org/10.1242/jcs.01208" @default.
• W2131194303 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15226372" @default.
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