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• W2968233637 abstract "Abstract Phosphoinositides (PIs) as regulatory membrane lipids play essential roles in multiple cellular processes. Although the exact molecular targets of PIs-dependent modulation remain largely elusive, the effects of disturbed PIs metabolism could be employed to propose regulatory modules associated with particular downstream targets of PIs. Here, we identified the role of GRAIN NUMBER AND PLANT HEIGHT 1 ( GH1 ), which encodes a suppressor of actin (SAC) domain-containing phosphatase with unknown function in rice. Endoplasmic reticulum-localized GH1 specifically dephosphorylated and hydrolyzed phosphatidylinositol 4-phosphate (PI4P) and phosphatidylinositol 4,5-bisphosphate [PI(4,5)P 2 ]. Inactivation of GH1 resulted in massive accumulation of both PI4P and PI(4,5)P 2 , while excessive GH1 caused their depletion. Notably, superabundant PI4P and PI(4,5)P 2 could both disrupt actin cytoskeleton organization and suppress cell elongation. Interestingly, both PI4P and PI(4,5)P 2 inhibited actin-related proteins 2 and 3 (Arp2/3) complex-nucleated actin branching networks in vitro , whereas PI(4,5)P 2 showed more dramatic effect in a dose-dependent manner. Overall, the overaccumulation of PI(4,5)P 2 resulted from dysfunction of SAC phosphatase possibly perturbs Arp2/3 complex-mediated actin polymerization, thereby disordering the cell development. These findings imply that Arp2/3 complex might be the potential molecular target of PI(4,5)P 2 -dependent modulation in eukaryotes, thereby providing new insights into the relationship between PIs homeostasis and plants growth and development." @default.
• W2968233637 created "2019-08-22" @default.
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• W2968233637 date "2019-08-19" @default.
• W2968233637 modified "2023-09-26" @default.
• W2968233637 title "A SAC phosphoinositide phosphatase controls rice development via hydrolyzing phosphatidylinositol 4-phosphate and phosphatidylinositol 4,5-bisphosphate" @default.
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• W2968233637 doi "https://doi.org/10.1101/740001" @default.
• W2968233637 hasPublicationYear "2019" @default.
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