SHP2 tyrosine phosphatase converts parafibromin/Cdc73 from a tumor suppressor to an oncogenic driver.

SHP2 tyrosine phosphatase converts parafibromin/Cdc73 from a tumor suppressor to an oncogenic driver.
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DOI:
10.1016/j.molcel.2011.05.014
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发表时间:
2011-07-08
期刊:
影响因子:
16
通讯作者:
Hatakeyama M
Hatakeyama M
中科院分区:
生物学1区
文献类型:
--
作者:
Takahashi A;Tsutsumi R;Kikuchi I;Obuse C;Saito Y;Seidi A;Karisch R;Fernandez M;Cho T;Ohnishi N;Rozenblatt-Rosen O;Meyerson M;Neel BG;Hatakeyama M

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SHP 2的失调与恶性疾病以及发育障碍有关。尽管SHP 2是RAS信号传导完全激活所必需的,但在细胞生理学中的其他潜在作用尚未阐明。在这里,我们表明,SHP 2去磷酸化parafibromin/Cdc 73,RNA聚合酶II相关因子(PAF)复合物的核心组成部分。已知副纤维蛋白作为肿瘤抑制剂,通过募集SUV 39 H1组蛋白甲基转移酶抑制细胞周期蛋白D1和c-myc。然而,副纤维蛋白也可以通过结合β-连环蛋白以相反的方向起作用,从而激活促有丝分裂/致癌Wnt信号传导。我们发现,当酪氨酸被SHP 2去磷酸化时,parafibromin获得稳定结合β-catenin的能力。parafibromin/β-catenin相互作用推翻parafibromin/SUV 39 H1介导的反式阻遏,并诱导Wnt靶基因的表达,包括细胞周期蛋白D1和c-myc。因此,SHP 2控制副纤维蛋白的相反功能,其失调可能导致肿瘤或发育畸形的发展。
Deregulation of SHP2 is associated with malignant diseases as well as developmental disorders. Although SHP2 is required for full activation of RAS signaling, other potential roles in cell physiology have not been elucidated. Here we show that SHP2 dephosphorylates parafibromin/Cdc73, a core component of the RNA polymerase II-associated factor (PAF) complex. Parafibromin is known to act as a tumor suppressor that inhibits cyclin D1 and c-myc by recruiting SUV39H1 histone methyltransferase. However, parafibromin can also act in the opposing direction by binding β-catenin, thereby activating pro-mitogenic/oncogenic Wnt signaling. We found that, upon tyrosine dephosphorylation by SHP2, parafibromin acquires the ability to stably bind β-catenin. The parafibromin/β-catenin interaction overrides parafibromin/SUV39H1-mediated transrepression and induces expression of Wnt target genes, including cyclin D1 and c-myc. Hence, SHP2 governs the opposing functions of parafibromin, deregulation of which may cause the development of tumors or developmental malformations.
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