Mutations in Fbx4 inhibit dimerization of the SCF(Fbx4) ligase and contribute to cyclin D1 overexpression in human cancer.

Mutations in Fbx4 inhibit dimerization of the SCF(Fbx4) ligase and contribute to cyclin D1 overexpression in human cancer.
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DOI:
10.1016/j.ccr.2008.05.017
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发表时间:
2008-07-08
期刊:
影响因子:
50.3
通讯作者:
Diehl, J. Alan
Diehl, J. Alan
中科院分区:
医学1区
文献类型:
--
作者:
Barbash, Olena;Zamfirova, Petia;Lin, Douglas I.;Chen, Xiangmei;Yang, Ke;Nakagawa, Hiroshi;Lu, Fengmin;Rustgi, Anil K.;Diehl, J. Alan

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SCFFbx 4最近被鉴定为细胞周期蛋白D1的E3连接酶。我们现在描述细胞周期依赖性的Fbx 4磷酸化和二聚化,其由GSK 3 β调节,在人类癌症中有缺陷。我们提供的数据表明,涉及Ras-Akt-GSK 3 β的途径控制SCFFbx 4 E3连接酶的时间磷酸化和二聚化。Fbx 4活性的抑制导致核细胞周期蛋白D1的积累和致癌转化。这种调节途径对正常细胞生长的重要性通过在人类癌症中Fbx 4中损害二聚化的突变的流行来强调。总的来说,这些数据表明,细胞周期蛋白D1 E3连接酶的失活可能会导致细胞周期蛋白D1在人类癌症的显着部分过表达。
SCFFbx4 was recently identified as the E3 ligase for cyclin D1. We now describe cell cycle-dependent phosphorylation and dimerization of Fbx4 that is regulated by GSK3β and defective in human cancer. We present data demonstrating that a pathway involving Ras-Akt-GSK3β controls the temporal phosphorylation and dimerization of the SCFFbx4 E3 ligase. Inhibition of Fbx4 activity results in accumulation of nuclear cyclin D1 and oncogenic transformation. The importance of this regulatory pathway for normal cell growth is emphasized by the prevalence of mutations in Fbx4 in human cancer that impair dimerization. Collectively, this data reveals that inactivation of the cyclin D1 E3 ligase will likely contribute to cyclin D1 overexpression in a significant fraction of human cancer.
DOI: 10.1101/gad.11.8.957
发表时间: 1997-04-15
影响因子: 10.5
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