Trihydrophobin 1 phosphorylation by c-Src regulates MAPK/ERK signaling and cell migration.

Trihydrophobin 1 phosphorylation by c-Src regulates MAPK/ERK signaling and cell migration.
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C-SRC通过C-SRC磷酸化1磷酸化,调节MAPK/ERK信号传导和细胞迁移。

DOI:
10.1371/journal.pone.0029920
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Zhang S
Zhang S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Wu W;Sun Z;Wu J;Peng X;Gan H;Zhang C;Ji L;Xie J;Zhu H;Ren S;Gu J;Zhang S

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c-Src激活Ras-MAPK/ERK信号通路,调控细胞迁移,而trihydrophobin 1 (TH1)通过与A-Raf和PAK1相互作用,抑制其激酶活性,抑制MAPK/ERK激活和细胞迁移。通过GST-pull - down实验、共免疫沉淀和共聚焦显微镜实验,我们发现c-Src与TH1相互作用。这种相互作用导致TH1在体内和体外的tyr6位点磷酸化。TH1的磷酸化降低了其与A-Raf和PAK1的关联。进一步的研究表明TH1的tyr6磷酸化降低了其对MAPK/ERK信号的抑制,增强了c-Src介导的细胞迁移。此外,已发现EGF和雌激素处理可诱导TH1的酪氨酸磷酸化。综上所述,我们的研究结果证明了一种新的机制,可以全面调节Ras/Raf/MEK/ERK信号传导和细胞迁移,涉及c-Src对TH1的酪氨酸磷酸化。
c-Src activates Ras-MAPK/ERK signaling pathway and regulates cell migration, while trihydrophobin 1 (TH1) inhibits MAPK/ERK activation and cell migration through interaction with A-Raf and PAK1 and inhibiting their kinase activities. Here we show that c-Src interacts with TH1 by GST-pull down assay, coimmunoprecipitation and confocal microscopy assay. The interaction leads to phosphorylation of TH1 at Tyr-6 in vivo and in vitro. Phosphorylation of TH1 decreases its association with A-Raf and PAK1. Further study reveals that Tyr-6 phosphorylation of TH1 reduces its inhibition on MAPK/ERK signaling, enhances c-Src mediated cell migration. Moreover, induced tyrosine phosphorylation of TH1 has been found by EGF and estrogen treatments. Taken together, our findings demonstrate a novel mechanism for the comprehensive regulation of Ras/Raf/MEK/ERK signaling and cell migration involving tyrosine phosphorylation of TH1 by c-Src.
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