PACT establishes a posttranscriptional brake on mitochondrial biogenesis by promoting the maturation of miR-181c.

PACT establishes a posttranscriptional brake on mitochondrial biogenesis by promoting the maturation of miR-181c.
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PACT通过促进miR-181 c的成熟对线粒体生物合成建立转录后制动。

DOI:
10.1016/j.jbc.2022.102050
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发表时间:
2022-07
影响因子:
4.8
通讯作者:
Erbay, Ebru
Erbay, Ebru
中科院分区:
生物学2区
文献类型:
--
作者:
Dogan, Asli E.;Hamid, Syed M.;Yildirim, Asli D.;Yildirim, Zehra;Sen, Ganes;Riera, Celine E.;Gottlieb, Roberta A.;Erbay, Ebru

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双链rna依赖蛋白激酶激活蛋白(PACT)是一种rna结合蛋白,是rna诱导沉默复合体的一部分,在mir介导的翻译抑制中起关键作用。先前的研究表明,PACT调节各种miR的表达,选择miR链装载到rna诱导的沉默复合体上,并决定合适的miR长度。除了PACT在免疫细胞中介导抗病毒反应的作用外,PACT在其他细胞类型中的作用尚不清楚。引人注目的是,研究还表明,寒冷暴露会导致小鼠棕色脂肪组织(BAT)中PACT蛋白的显著下调,而线粒体的生物发生和代谢在BAT中起着核心作用。在这里,我们发现PACT通过促进miR-181c的成熟,建立了线粒体生物发生(线粒体生物发生)的转录后抑制,miR-181c是线粒体生物发生的关键抑制因子,已被证明可靶向线粒体复合体IV亚基I (Mtco1)和sirtuin 1 (Sirt1)。与此一致的是,我们发现PACT表达的部分减少足以增强培养中的棕色脂肪细胞以及小鼠BAT激活过程中的丝分裂发生。总之,我们证明了PACT在细胞和BAT的线粒体生物发生和能量学调控中的意想不到的作用。
The double-stranded RNA-dependent protein kinase activating protein (PACT), an RNA-binding protein that is part of the RNA-induced silencing complex, plays a key role in miR-mediated translational repression. Previous studies showed that PACT regulates the expression of various miRs, selects the miR strand to be loaded onto RNA-induced silencing complex, and determines proper miR length. Apart from PACT’s role in mediating the antiviral response in immune cells, what PACT does in other cell types is unknown. Strikingly, it has also been shown that cold exposure leads to marked downregulation of PACT protein in mouse brown adipose tissue (BAT), where mitochondrial biogenesis and metabolism play a central role. Here, we show that PACT establishes a posttranscriptional brake on mitochondrial biogenesis (mitobiogenesis) by promoting the maturation of miR-181c, a key suppressor of mitobiogenesis that has been shown to target mitochondrial complex IV subunit I (Mtco1) and sirtuin 1 (Sirt1). Consistently, we found that a partial reduction in PACT expression is sufficient to enhance mitobiogenesis in brown adipocytes in culture as well as during BAT activation in mice. In conclusion, we demonstrate an unexpected role for PACT in the regulation of mitochondrial biogenesis and energetics in cells and BAT.
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