The E3 ligase TRAF6 regulates Akt ubiquitination and activation.

The E3 ligase TRAF6 regulates Akt ubiquitination and activation.
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DOI:
10.1126/science.1175065
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发表时间:
2009-08-28
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Lin HK
Lin HK
中科院分区:
其他
文献类型:
--
作者:
Yang WL;Wang J;Chan CH;Lee SW;Campos AD;Lamothe B;Hur L;Grabiner BC;Lin X;Darnay BG;Lin HK

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Akt信号在许多生物学功能中起着重要作用,如细胞增殖和凋亡。由于Akt主要存在于胞质溶胶中,因此尚不清楚这些信号分子如何被募集到质膜并随后被生长因子刺激激活。在这里,我们发现蛋白激酶Akt经历赖氨酸63链泛素化,这对于Akt膜定位和磷酸化是重要的。TRAF6被发现是Akt的直接E3连接酶,并且对于生长因子刺激后的Akt泛素化、膜募集和磷酸化是必需的。人类癌症相关Akt突变体(E17 K)显示Akt泛素化增加,反过来有助于Akt膜定位和磷酸化的增强。因此,Akt泛素化是致癌Akt激活的重要步骤。
Akt signaling plays a central role in many biological functions, such as cell proliferation and apoptosis. Since Akt resides primarily in the cytosol, it is not known how these signaling molecules are recruited to the plasma membrane and subsequently activated by growth factor stimuli. Here, we found that the protein kinase Akt undergoes lysine 63 chain ubiquitination, which is important for Akt membrane localization and phosphorylation. TRAF6 was found to be a direct E3 ligase for Akt and was essential for Akt ubiquitination, membrane recruitment, and phosphorylation upon growth-factor stimulation. The human cancer-associated Akt mutant (E17K) displayed an increase in Akt ubiquitination, in turn contributing to the enhancement of Akt membrane localization and phosphorylation. Thus, Akt ubiquitination is an important step for oncogenic Akt activation.
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