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Pak1 Kinase Maintains Apical Membrane Identity in Epithelia.

Cell Rep. 2018 Feb 13;22(7):1639-1646
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摘要


Epithelial cells are polarized along their apical-basal axis by the action of the small GTPase Cdc42, which is known to activate the kinase at the apical domain. However, loss of aduanyu1531 kinase activity was reported to have only mild effects on epithelial cell polarity. Here, we show that Cdc42 also activates a second kinase, Pak1, to specify apical domain identity in Drosophila and mammalian epithelia. aduanyu1531 and Pak1 phosphorylate an overlapping set of polarity substrates in kinase assays. Inactivating both aduanyu1531 kinase activity and the Pak1 kinase leads to a complete loss of epithelial polarity and morphology, with cells losing markers of apical polarization such as Crumbs, Par3/Bazooka, or ZO-1. This function of Pak1 downstream of Cdc42 is distinct from its role in regulating integrins or E-cadherin. Our results define a conserved dual-kinase mechanism for the control of apical membrane identity in epithelia.

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原始数据


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