ERK-mediated phosphorylation of TFAM downregulates mitochondrial transcription: implications for Parkinson's disease.

ERK-mediated phosphorylation of TFAM downregulates mitochondrial transcription: implications for Parkinson's disease.
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DOI:
10.1016/j.mito.2014.04.008
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发表时间:
2014-07
期刊:
影响因子:
4.4
通讯作者:
Chu, Charleen T.
Chu, Charleen T.
中科院分区:
生物学3区
文献类型:
--
作者:
Wang, Kent Z. Q.;Zhu, Jianhui;Dagda, Ruben K.;Uechi, Guy;Cherra, Salvatore J., III;Gusdon, Aaron M.;Balasubramani, Manimalha;Chu, Charleen T.

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线粒体转录因子A(TFAM)调节线粒体生物发生,其在用复合物I抑制剂1-甲基-4-苯基吡啶鎓(MPP+)长期处理的细胞中被细胞外信号调节蛋白激酶(ERK 1/2)下调。我们利用质谱鉴定ERK 1/2依赖性TFAM磷酸化位点。TFAM在丝氨酸177处突变以模拟磷酸化,重现了MPP+在降低TFAM与轻链启动子的结合、抑制线粒体转录中的作用。突变TFAM不能影响呼吸功能或挽救MPP+对呼吸复合物的作用。这些数据揭示了ERK 1/2通过直接磷酸化TFAM调节线粒体功能的新机制。
Mitochondrial transcription factor A (TFAM) regulates mitochondrial biogenesis, which is downregulated by extracellular signal-regulated protein kinases (ERK1/2) in cells treated chronically with the complex I inhibitor 1-methyl-4-phenylpyridinium (MPP+). We utilized mass spectrometry to identify ERK1/2-dependent TFAM phosphorylation sites. Mutation of TFAM at serine 177 to mimic phosphorylation recapitulated the effects of MPP+ in decreasing the binding of TFAM to the light strand promoter, suppressing mitochondrial transcription. Mutant TFAM was unable to affect respiratory function or rescue the effects of MPP+ on respiratory complexes. These data disclose a novel mechanism by which ERK1/2 regulates mitochondrial function through direct phosphorylation of TFAM.
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