一个α-格酸盐构造开关控制人类FTO蛋白的铁可访问性,激活性和基质选择
Daniel Burns1, Balabhadra Khatiwada2, Aayushi Singh2
1Roy J. Carver Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA 50011.
概括
脂肪质量和与肥胖相关的 (FTO) 蛋白质通过激活α-谷酸盐来去甲基化核酸. 核酸结合稳定了构造,使铁催化剂暴露在氧气中,提高了脱甲基化效率.
科学领域:
- 生物化学 生化学
- 分子生物学分子生物学
- 酶学 是一种酶学.
背景情况:
- 脂肪质量和与肥胖相关的 (FTO) 蛋白质是AlkB家族的二氧化酶,对于去甲基化各种RNA和DNA修饰至关重要.
- FTO的催化机制涉及alpha-ketoglutarate (αKG) 的脱碳化和随后的甲基化核酸的氧化.
- 核酸结合激活FTO并影响脱甲基化速率的确切机制尚不完全理解.
研究的目的:
- 阐明核酸结合激活脂肪质量和与肥胖相关 (FTO) 蛋白质的分子机制.
- 为了研究核酸结构和FTO不同甲基修饰的脱甲基化效率之间的关系.
- 了解FTO如何在催化过程中调节氧气进入其铁辅因子.
主要方法:
- 溶液核磁共振 (NMR) 谱学用于研究FTO-DNA相互作用.
- 分子动力学 (MD) 模拟以建模形状变化.
- 酶分析测量去甲基化速率.
主要成果:
- 核酸与FTO结合会在α-谷酸盐 (αKG) 副基质中诱导两种状态的结构平衡.
- 这种形状变化调节了Fe (II) 催化中心对分子氧 (O2) 的可访问性.
- 脱甲基化效率与基质稳定可氧化Fe (II) 构成的能力相关.
结论:
- 核酸结合对于激活alpha-ketoglutarate (αKG) 脱氧化反应至关重要,通过将催化铁暴露于O2.
- FTO介导脱甲基的速度取决于甲基基如何有效地稳定暴露在氧气中的Fe (II) 状态.
- 这些发现为FTO活动的全调节及其基质特异性提供了关键的见解.
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