PIP kinases and their role in plant tip growing cells
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概要
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Phosphatidylinositol (4,5) bisphosphate [PtdIns(4,5)P2], is asignaling lipid involved in many important processes in animalcells such as cytoskeleton organization, intracellular vesiculartrafficking, secretion, cell motility, regulation of ion channels,and nuclear signaling pathways. In the last years PtdIns(4,5)P2and its synthesizing enzyme, phosphatidylinositol phosphatekinase (PIPK), has been intensively studied in plant cells,revealing a key role in the control of polar tip growth. Analysis ofthe PIPK members from Arabidopsis thaliana, Oryza sativa andPhyscomitrella patens showed that they share some regulatoryfeatures with animal PIPKs but also exert plant-specific modesof regulation. This review aims at giving an overview on thePIPK family from Arabidopsis thaliana and Physcomitrellapatens. Even though their basic structure, modes of activationand physiological role is evolutionary conserved, modulesresponsible for plasma membrane localization are distinct fordifferent PIPKs, depending on differences in physiological and/or developmental status of cells, such as polarized and nonpolarized.
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