SIRT1 associates with eIF2-alpha and regulates the cellular stress response.

SIRT1 associates with eIF2-alpha and regulates the cellular stress response.
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DOI:
10.1038/srep00150
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发表时间:
2011
期刊:
影响因子:
4.6
通讯作者:
Robbins, Paul D.
Robbins, Paul D.
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ghosh, Hiyaa Singhee;Reizis, Boris;Robbins, Paul D.

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SIRT 1是一种NAD+依赖性蛋白脱乙酰酶,已知可增加模型生物的寿命。SIRT 1通过调节蛋白质如p53和FOXO来调节细胞对氧化和/或遗传毒性应激的反应。真核生物起始因子2(eIF 2)在整合的应激反应途径中起着关键作用。在细胞应激下,eIF 2 α亚基的磷酸化对于立即关闭翻译和激活应激反应基因是必不可少的。在这里,我们证明了SIRT 1与eIF 2 α相互作用。SIRT 1的缺失导致eIF 2 α的磷酸化增加。然而,下游应激诱导的信号传导途径在SIRT 1缺陷细胞中受损,这由下游靶基因CHOP和GADD 34的延迟表达和较慢的应激后翻译恢复指示。最后,SIRT 1与eIF 2 α去磷酸化介质GADD 34和CreP共免疫沉淀,表明SIRT 1在eIF 2 α磷酸化的负反馈调节中发挥作用。
SIRT1 is a NAD+ dependent protein deacetylase known to increase longevity in model organisms. SIRT1 regulates cellular response to oxidative and/or genotoxic stress by regulating proteins such as p53 and FOXO. The eukaryotic initiation factor-2, eIF2, plays a critical role in the integrated stress response pathway. Under cellular stress, phosphorylation of the alpha subunit of eIF2 is essential for immediate shut-off of translation and activation of stress response genes. Here we demonstrate that SIRT1 interacts with eIF2α. Loss of SIRT1 results in increased phosphorylation of eIF2α. However, the downstream stress induced signaling pathway is compromised in SIRT1-deficient cells, indicated by delayed expression of the downstream target genes CHOP and GADD34 and a slower post-stress translation recovery. Finally, SIRT1 co-immunoprecipitates with mediators of eIF2α dephosphorylation, GADD34 and CreP, suggesting a role for SIRT1 in the negative feedback regulation of eIF2α phosphorylation.
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