Merkel cell polyomavirus small T antigen controls viral replication and oncoprotein expression by targeting the cellular ubiquitin ligase SCFFbw7.

Merkel cell polyomavirus small T antigen controls viral replication and oncoprotein expression by targeting the cellular ubiquitin ligase SCFFbw7.
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DOI:
10.1016/j.chom.2013.06.008
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发表时间:
2013-08-14
影响因子:
30.3
通讯作者:
Chang Y
Chang Y
中科院分区:
医学1区
文献类型:
--
作者:
Kwun HJ;Shuda M;Feng H;Camacho CJ;Moore PS;Chang Y

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默克尔细胞多瘤病毒 (MCV) 通过表达小 T (sT) 和大 T (LT) 病毒癌蛋白,引起侵袭性人类皮肤癌,即默克尔细胞癌。 MCV sT 也是多功能 MCV LT 解旋酶蛋白有效复制 MCV DNA 所必需的。我们发现 LT 是细胞 SCFFbw7 E3 连接酶降解蛋白酶体的目标,而 sT 可通过其 LT 稳定结构域 (LSD) 抑制该连接酶。因此,sT 还能稳定细胞 SCFFbw7 靶标,包括细胞周期调节因子 c-Myc 和细胞周期蛋白 E。突变 sT LSD 会降低 LT 蛋白水平,并消除 MCV DNA 复制和 sT 诱导的细胞转化中的协同作用。 SCFFbw7 敲低模拟了 sT 介导的 LT 稳定,但这种敲低不足以完全重建突变型 LSD sT 蛋白的转化活性。因此,MCV 已经进化出一个涉及 SCFFbw7 的调节系统,该系统控制病毒复制,但也有助于宿主细胞转化。
Merkel cell polyomavirus (MCV) causes an aggressive human skin cancer, Merkel cell carcinoma, through expression of small T (sT) and large T (LT) viral oncoproteins. MCV sT is also required for efficient MCV DNA replication by the multifunctional MCV LT helicase protein. We find that LT is targeted for proteasomal degradation by the cellular SCFFbw7 E3 ligase, which can be inhibited by sT through its LT stabilization domain (LSD). Consequently, sT also stabilizes cellular SCFFbw7 targets, including the cell cycle regulators c-Myc and cyclin E. Mutating the sT LSD decreases LT protein levels and eliminates synergism in MCV DNA replication as well as sT-induced cell transformation. SCFFbw7 knockdown mimics sT-mediated stabilization of LT, but this knockdown is insufficient to fully reconstitute the transforming activity of a mutant LSD sT protein. Thus, MCV has evolved a regulatory system involving SCFFbw7 that controls viral replication but also contributes to host cell transformation.
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