在二氧化原酶的催化循环中,甲酸通过减少Fe (III) 来重新编程表观基因组和表转录基因组
Weizhi He1, Xiaotong Yin1, Chu Xu1
1Cancer Institute, Fudan university Shanghai Cancer Center, Institutes of Biomedical Sciences, Shanghai Key Laboratory of Medical Epigenetics, International Co-laboratory of Medical Epigenetics and Metabolism (Ministry of Science and Technology), Shanghai Medical College of Fudan University, Shanghai 200032, China.
ACS chemical biology
|December 15, 2023
概括
亚酸 (ASC) 作为二氧化原酶的辅因子,通过将Fe (III) 降低为Fe (II) 来再生不活跃的酶. 这一过程通过删除mRNAm6A甲基化来重新编程表转录组,揭示了ASC在酶催化中的关键作用.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 众所周知,甲酸 (ASC) 能够刺激DNA和基因组脱甲基酶.
- 它在二氧化原酶的催化循环中作为辅助因子的确切作用尚不清楚.
- 研究ASC对TET2,ALKBH3,基因组脱甲基酶和FTO的刺激是必不可少的.
研究的目的:
- 系统地研究 Askorbic 酸 (ASC) 对二氧化原酶的刺激作用.
- 阐明ASC在TET2,ALKBH3,基因组脱甲基酶和FTO的催化循环中的作用.
- 了解ASC如何通过m6A去甲基化重新编程表表达体.
主要方法:
- 生物化学测定用于研究二氧化原酶活性.
- 电子自旋共振 (ESR) 谱学用于分析氧化还原状态.
- 在体外对DNA和基因素脱甲基酶以及RNA脱甲基酶FTO和ALKBH5.5的研究.
主要成果:
- 亚酸 (ASC) 通过在mRNA中删除超甲基化m6A位点来重编程表转录组.
- 生物化学和ESR测定表明ASC进入了二氧化原酶活性部位.
- ASC将Fe (III) 降低到Fe (II),这对酶活性至关重要.
结论:
- 亚酸 (ASC) 作为一种关键的辅因子作用于二氧化原酶,包括TET2,ALKBH3和FTO.
- 在一个动态的"撞击逃跑"机制中,ASC通过回收Fe (III) 变成Fe (II) 来再生非活性二氧化酶.
- 这种ASC的辅因子活动对于通过m6A脱甲基化对表表体转录组重编程至关重要.
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