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
中科院分区:
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
关键词:
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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DOI:
10.1073/pnas.0804793105
发表时间:
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影响因子:
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