Tumour suppressor SIRT3 deacetylates and activates manganese superoxide dismutase to scavenge ROS.
Tumour suppressor SIRT3 deacetylates and activates manganese superoxide dismutase to scavenge ROS.
复制标题
肿瘤抑制因子 SIRT3 脱乙酰并激活锰超氧化物歧化酶清除 ROS
DOI:
10.1038/embor.2011.65
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发表时间:
2011-06
期刊:
影响因子:
7.7
通讯作者:
Xiong, Yue
中科院分区:
文献类型:
--
作者:
Chen, Yaohui;Zhang, Jinye;Lin, Yan;Lei, Qunying;Guan, Kun-Liang;Zhao, Shimin;Xiong, Yue
Mitochondria manganese superoxide dismutase (SOD2) is an important antioxidant enzyme, deficiency of which is associated with various human diseases. The known primary regulation of SOD2 is through transcriptional activation. Here, we report that SOD2 is acetylated at Lys 68 and that this acetylation decreases SOD2 activity. Mitochondrial deacetylase SIRT3 binds to, deacetylates and activates SOD2. Increase of reactive oxygen species (ROS) levels stimulates SIRT3 transcription, leading to SOD2 deacetylation and activation. SOD2-mediated ROS reduction is synergistically increased by SIRT3 co-expression, but is cancelled by SIRT3 depletion. These results reveal a new post-translational regulation of SOD2 by means of acetylation and SIRT3-dependent deacetylation in response to oxidative stress.
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