Deubiquitylation and stabilization of PTEN by USP13.

Deubiquitylation and stabilization of PTEN by USP13.
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USP13对PTEN的去泛素化和稳定。

DOI:
10.1038/ncb2874
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发表时间:
2013-12
影响因子:
21.3
通讯作者:
--
中科院分区:
生物学1区
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--
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肿瘤抑制基因PTEN在人类癌症中经常丢失。除了基因突变和缺失,最近的研究已经揭示了翻译后修饰的重要性,如泛素化,在调节PTEN的稳定性,活性和定位。然而,调节PTEN多聚泛素化和蛋白质稳定性的去泛素化酶仍然未知。在这里,我们筛选了总共30种去泛素化酶(DUB),并确定了5种与PTEN物理相关的DUB。其中之一,USP13,通过直接结合和去泛素化的PTEN蛋白稳定。乳腺癌细胞中USP13的缺失通过下调PTEN促进AKT磷酸化、细胞增殖、锚定非依赖性生长、糖酵解和肿瘤生长。相反,USP13的过表达抑制了PTEN阳性乳腺癌细胞中的肿瘤发生和糖酵解,而不是PTEN缺失的乳腺癌细胞。重要的是,USP13蛋白在人类乳腺肿瘤中下调,并与PTEN蛋白水平相关。这些发现将USP13鉴定为通过去泛素化和稳定PTEN发挥作用的肿瘤抑制蛋白。
The tumor suppressor PTEN is frequently lost in human cancers. In addition to gene mutations and deletions, recent studies have revealed the importance of post-translational modifications, such as ubiquitination, in the regulation of PTEN stability, activity and localization. However, the deubiquitinase that regulates PTEN poly-ubiquitination and protein stability remains unknown. Here we screened a total of 30 deubiquitinating enzymes (DUBs) and identified five DUBs that physically associate with PTEN. One of them, USP13, stabilizes PTEN protein via direct binding and deubiquitination of PTEN. Loss of USP13 in breast cancer cells promotes AKT phosphorylation, cell proliferation, anchorage-independent growth, glycolysis and tumor growth through downregulation of PTEN. Conversely, overexpression of USP13 suppresses tumorigenesis and glycolysis in PTEN-positive but not PTEN-null breast cancer cells. Importantly, USP13 protein is downregulated in human breast tumors and correlates with PTEN protein levels. These findings identify USP13 as a tumor-suppressing protein that functions through deubiquitination and stabilization of PTEN.
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