Proto-Oncogenic Src Phosphorylates EB1 to Regulate the Microtubule-Focal Adhesion Crosstalk and Stimulate Cell Migration.

Proto-Oncogenic Src Phosphorylates EB1 to Regulate the Microtubule-Focal Adhesion Crosstalk and Stimulate Cell Migration.
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原癌 Src 磷酸化 EB1 以调节微管-焦点粘附串扰并刺激细胞迁移

DOI:
10.7150/thno.16356
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发表时间:
2016
期刊:
影响因子:
12.4
通讯作者:
Zhou J
Zhou J
中科院分区:
医学1区
文献类型:
--
作者:
Zhang Y;Luo Y;Lyu R;Chen J;Liu R;Li D;Liu M;Zhou J

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细胞迁移是一个复杂的过程,对肿瘤的进展和转移至关重要,需要微管(MT)和粘着斑(FA)之间的动态串扰。然而,这一事件背后的分子机制仍然难以捉摸。在这里,我们确定的原癌基因蛋白Src作为一个重要的球员在调节MT-FA串扰。Src与末端结合蛋白1(EB 1)相互作用并使其磷酸化,EB 1是MT加末端跟踪蛋白(+TIPs)的成员,在细胞和体外都是如此。系统突变显示酪氨酸-247(Y247)是Src磷酸化EB 1的主要残基。有趣的是,组成型激活的Src和Y247-磷酸化的EB 1定位于中心体和FA。Src介导的EB 1磷酸化减少了它与其他+TIP的相互作用,包括腺瘤性结肠息肉病(APC)和有丝分裂着丝粒相关驱动蛋白(MCAK)。此外,EB 1在Y247处的磷酸化增强了MT突变的速率,并显著刺激细胞迁移。因此,这些发现表明Src-EB 1轴在调节MT和FA之间的串扰以促进细胞迁移中起着至关重要的作用。
Cell migration, a complex process critical for tumor progression and metastasis, requires a dynamic crosstalk between microtubules (MTs) and focal adhesions (FAs). However, the molecular mechanisms underlying this event remain elusive. Herein we identify the proto-oncogenic protein Src as an important player in the regulation of the MT-FA crosstalk. Src interacts with and phosphorylates end-binding protein 1 (EB1), a member of MT plus end-tracking proteins (+TIPs), both in cells and in vitro. Systematic mutagenesis reveals that tyrosine-247 (Y247) is the primary residue of EB1 phosphorylated by Src. Interestingly, both constitutively activated Src and Y247-phosphorylated EB1 localize to the centrosome and FAs. Src-mediated EB1 phosphorylation diminishes its interactions with other +TIPs, including adenomatous polyposis coli (APC) and mitotic centromere associated kinesin (MCAK). In addition, EB1 phosphorylation at Y247 enhances the rate of MT catastrophe and significantly stimulates cell migration. These findings thus demonstrate that the Src-EB1 axis plays a crucial role in regulating the crosstalk between MTs and FAs to promote cell migration.
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