PTENα, a PTEN isoform translated through alternative initiation, regulates mitochondrial function and energy metabolism.

PTENα, a PTEN isoform translated through alternative initiation, regulates mitochondrial function and energy metabolism.
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DOI:
10.1016/j.cmet.2014.03.023
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发表时间:
2014-05-06
期刊:
影响因子:
29
通讯作者:
Yin Y
Yin Y
中科院分区:
生物学1区
文献类型:
--
作者:
Liang H;He S;Yang J;Jia X;Wang P;Chen X;Zhang Z;Zou X;McNutt MA;Shen WH;Yin Y

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PTEN是人类肿瘤中最常发生突变的基因之一。已知PTEN具有除肿瘤抑制之外的广泛生物学功能。在这里,我们报告,PTENα,N-末端延伸形式的PTEN,在代谢中发挥作用。PTENα的翻译起始于经典PTEN编码区上游的CUG密码子,并与经典PTEN编码区同框。真核翻译起始因子2A(eIF 2A)控制着PTENα的翻译,在这个过程中需要一个以CUG为中心的回文基序。PTENα诱导线粒体中细胞色素c氧化酶活性和ATP产生。TALEN介导的PTENα体细胞缺失损害线粒体呼吸链功能我们发现,PTENα与典型的PTEN相互作用,以增加PINK 1和促进能量产生。这些数据提供了深入了解PTEN家族参与多种细胞过程的机制。我们的研究表明,哺乳动物细胞可以使用替代翻译起始机制产生蛋白质异构体。
PTEN is one of the most frequently mutated genes in human cancer. It is known that PTEN has a wide range of biological functions beyond tumor suppression. Here we report that PTENα, an N-terminally extended form of PTEN, functions in metabolism. Translation of PTENα is initiated from a CUG codon upstream of and in-frame with the coding region of canonical PTEN. Eukaryotic translation initiation factor 2A (eIF2A) controls PTENα translation and a CUG-centered palindromic motif is required in this process. PTENα induces cytochrome c oxidase activity and ATP production in mitochondria. TALEN-mediated somatic deletion of PTENα impairs mitochondrial respiratory chain function. We show that PTENα interacts with canonical PTEN to increase PINK1 and promote energy production. These data provide insights into the mechanism by which the PTEN family is involved in multiple cellular processes. Our studies suggest that mammalian cells can use alternate translation initiation mechanisms to generate protein isoforms.
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