The PDZ2 domain of zonula occludens-1 and -2 is a phosphoinositide binding domain.

The PDZ2 domain of zonula occludens-1 and -2 is a phosphoinositide binding domain.
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DOI:
10.1007/s00018-009-0156-6
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发表时间:
2009-12
影响因子:
8
通讯作者:
Gettemans, Jan
Gettemans, Jan
中科院分区:
生物学1区
文献类型:
--
作者:
Meerschaert, Kris;Tun, Moe Phyu;Remue, Eline;De Ganck, Ariane;Boucherie, Ciska;Vanloo, Berlinda;Degeest, Gisele;Vandekerckhove, Joel;Zimmermann, Pascale;Bhardwaj, Nitin;Lu, Hui;Cho, Wonhwa;Gettemans, Jan

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小带闭锁蛋白(ZO)是突触后密度蛋白-95Discs大小带闭塞蛋白(PDZ)结构域,在紧密连接(TJ)的组装和细胞极性的建立中起着重要作用。在这里,我们证明了ZO-1和ZO-2的第二个PDZ结构域与磷脂酰肌醇(PtdInsP)结合,并确定了参与相互作用的关键残基。此外,ZO PDZ2结构域的多肽和PtdInsP结合是相互排斥的。尽管ZO-1的质膜定位似乎不需要脂质结合,但与ZO-2的PDZ2结构域结合的磷脂酰肌醇4,5-二磷酸(PtdIns(4,5)P2)调节ZO-2向核斑点的募集。抑制ZO-2的表达破坏了斑点的形态,表明ZO-2可能在这些亚核结构的形成和稳定中发挥积极的作用。这项研究首次表明,ZO亚型与PtdInsPs结合,并为细胞核中蛋白质复合体的形成和稳定提供了一种替代的调节机制。
Zonula occludens proteins (ZO) are Postsynaptic density protein-95 Discs large-Zonula occludens (PDZ) domain-containing proteins that play a fundamental role in the assembly of tight junctions (TJ) and establishment of cell polarity. Here we show that the second PDZ domain of ZO-1 and ZO-2 binds phosphoinositides (PtdInsP) and we identified critical residues involved in the interaction. Furthermore, peptide and PtdInsP binding of ZO PDZ2 domains are mutually exclusive. Although lipid binding does not seem to be required for plasma membrane localisation of ZO-1, phosphatidylinositol 4,5-bisphosphate (PtdIns(4,5)P2) binding to the PDZ2 domain of ZO-2 regulates ZO-2 recruitment to nuclear speckles. Knockdown of ZO-2 expression disrupts speckle morphology, indicating that ZO-2 might play an active role in formation and stabilisation of these subnuclear structures. This study shows for the first time that ZO isoforms bind PtdInsPs and offers an alternative regulatory mechanism for the formation and stabilisation of protein complexes in the nucleus.
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