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The protein histidine phosphatase LHPP is a tumour suppressor
Nature ( IF 50.5 ) Pub Date : 2018-03-01 , DOI: 10.1038/nature26140
Sravanth K Hindupur 1 , Marco Colombi 1 , Stephen R Fuhs 2 , Matthias S Matter 3 , Yakir Guri 1 , Kevin Adam 2 , Marion Cornu 1 , Salvatore Piscuoglio 3 , Charlotte K Y Ng 3 , Charles Betz 1 , Dritan Liko 1 , Luca Quagliata 3 , Suzette Moes 1 , Paul Jenoe 1 , Luigi M Terracciano 3 , Markus H Heim 4 , Tony Hunter 2 , Michael N Hall 1
Affiliation  

Histidine phosphorylation, the so-called hidden phosphoproteome, is a poorly characterized post-translational modification of proteins. Here we describe a role of histidine phosphorylation in tumorigenesis. Proteomic analysis of 12 tumours from an mTOR-driven hepatocellular carcinoma mouse model revealed that NME1 and NME2, the only known mammalian histidine kinases, were upregulated. Conversely, expression of the putative histidine phosphatase LHPP was downregulated specifically in the tumours. We demonstrate that LHPP is indeed a protein histidine phosphatase. Consistent with these observations, global histidine phosphorylation was significantly upregulated in the liver tumours. Sustained, hepatic expression of LHPP in the hepatocellular carcinoma mouse model reduced tumour burden and prevented the loss of liver function. Finally, in patients with hepatocellular carcinoma, low expression of LHPP correlated with increased tumour severity and reduced overall survival. Thus, LHPP is a protein histidine phosphatase and tumour suppressor, suggesting that deregulated histidine phosphorylation is oncogenic.

中文翻译:

蛋白质组氨酸磷酸酶 LHPP 是一种肿瘤抑制因子

组氨酸磷酸化,即所谓的隐藏磷酸化蛋白质组,是蛋白质翻译后修饰的特征不佳。在这里,我们描述了组氨酸磷酸化在肿瘤发生中的作用。来自 mTOR 驱动的肝细胞癌小鼠模型的 12 个肿瘤的蛋白质组学分析显示,NME1 和 NME2(唯一已知的哺乳动物组氨酸激酶)被上调。相反,假定的组氨酸磷酸酶 LHPP 的表达在肿瘤中被特异性下调。我们证明 LHPP 确实是一种蛋白质组氨酸磷酸酶。与这些观察结果一致,整体组氨酸磷酸化在肝脏肿瘤中显着上调。LHPP 在肝细胞癌小鼠模型中的持续肝脏表达减少了肿瘤负荷并防止了肝功能的丧失。最后,在肝细胞癌患者中,LHPP 的低表达与肿瘤严重程度增加和总生存率降低相关。因此,LHPP 是一种蛋白质组氨酸磷酸酶和肿瘤抑制因子,表明失调的组氨酸磷酸化是致癌的。
更新日期:2018-03-01
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