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The intracellular fate of zonula occludens 2 is regulated by the phosphorylation of SR repeats and the phosphorylation/O-GlcNAcylation of S257

ZO-2 nuclear import and accumulation in speckles is regulated by phosphorylation of its SR repeats by SRPK1 in a process initiated by EGF activation of AKT. ZO-2 nuclear exportation is favored by O-GlcNAc of S257 at the nucleus, whereas maturation of tight junctions is accompanied by ZO-2 phosphorylation at S257 by PKCζ.