SUMOylation of the MAGUK protein CASK regulates dendritic spinogenesis.

SUMOylation of the MAGUK protein CASK regulates dendritic spinogenesis.
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DOI:
10.1083/jcb.200712094
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发表时间:
2008-07-14
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Hsueh YP
Hsueh YP
中科院分区:
其他
文献类型:
--
作者:
Chao HW;Hong CJ;Huang TN;Lin YL;Hsueh YP

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膜相关鸟苷酸激酶 (MAGUK) 蛋白与多种触发突触发生的粘附分子相互作用。然而,缺乏 MAGUK 蛋白参与突触形成的直接证据。在这项研究中,我们通过 RNA 干扰研究了钙/钙调蛋白依赖性丝氨酸蛋白激酶 (CASK)(一种 MAGUK 蛋白)在树突棘形成中的功能。培养的海马神经元中 CASK 的敲低会降低树突棘密度并缩小树突棘。我们对 RNA 干扰和 CASK 过表达实验的时间过程的分析进一步表明 CASK 稳定或维持脊柱形态。仅使用 CASK PDZ 结构域或缺乏蛋白质 4.1 结合位点的突变体的实验表明 CASK 参与连接跨膜粘附分子和肌动蛋白细胞骨架。我们还发现 CASK 是 SUMO 化的。小泛素样修饰剂 1 (SUMO1) 与 CASK 的缀合可减少 CASK 与蛋白质 4.1 之间的相互作用。 CASK-SUMO1 融合构建体的过度表达(模仿 CASK SUMO 化)会损害脊柱形成。我们的研究表明,CASK 有助于棘发生,并且这是由 SUMOylation 控制的。
Membrane-associated guanylate kinase (MAGUK) proteins interact with several synaptogenesis-triggering adhesion molecules. However, direct evidence for the involvement of MAGUK proteins in synapse formation is lacking. In this study, we investigate the function of calcium/calmodulin-dependent serine protein kinase (CASK), a MAGUK protein, in dendritic spine formation by RNA interference. Knockdown of CASK in cultured hippocampal neurons reduces spine density and shrinks dendritic spines. Our analysis of the time course of RNA interference and CASK overexpression experiments further suggests that CASK stabilizes or maintains spine morphology. Experiments using only the CASK PDZ domain or a mutant lacking the protein 4.1–binding site indicate an involvement of CASK in linking transmembrane adhesion molecules and the actin cytoskeleton. We also find that CASK is SUMOylated. Conjugation of small ubiquitin-like modifier 1 (SUMO1) to CASK reduces the interaction between CASK and protein 4.1. Overexpression of a CASK–SUMO1 fusion construct, which mimicks CASK SUMOylation, impairs spine formation. Our study suggests that CASK contributes to spinogenesis and that this is controlled by SUMOylation.
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