在AdoMet-依赖的甲基转移酶中,碳-氧-结合的保护和功能重要性
Scott Horowitz1, Lynnette M A Dirk, Joseph D Yesselman
1Howard Hughes Medical Institute , Ann Arbor, Michigan 48109, United States.
Journal of the American Chemical Society
|October 8, 2013
概括
非传统的CH···O键稳定了S-adenosylmethionine (AdoMet) 的结合和甲基组对齐在甲基转移酶中. 这一发现揭示了AdoMet依赖甲基化的共同进化机制,跨越了多种类型的酶.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 进化生物学 进化生物学
背景情况:
- 依赖S-adenosylmethionine (AdoMet) 的甲基化对于细胞代谢和信号传递至关重要.
- 依赖AdoMet的甲基转移酶,尽管有不同的类别,但具有保留的催化机制.
- 这种共享的甲基转移机制的基本决定因素在很大程度上仍未被定义.
研究的目的:
- 研究AdoMet依赖甲基转移酶的基础结构和机制特征.
- 为了确定协调AdoMet甲基组跨不同甲基转移酶类的保存相互作用.
- 阐明这些相互作用在AdoMet结合,过渡状态稳定和催化中的作用.
主要方法:
- 对各种甲基转移酶的高分辨率晶体结构分析.
- 量子化学计算以评估相互作用强度.
- 生物化学和结构研究模型氨酸甲基转移酶及其活性部位突变.
- 结晶学和NMR动力学实验.
主要成果:
- 非传统的碳-氧 (CH···O) 键始终协调AdoMet甲基组跨不同的甲基转移酶类.
- 量子化学计算证实了这些CH···O相互作用异常强烈.
- 突变分析表明,这些相互作用对于高 afinity AdoMet 结合和过渡状态稳定至关重要.
- 核磁共振动力学显示,CH···O键限制甲基运动,有助于催化对齐.
结论:
- 甲基CH···O结是AdoMet依赖的甲基转移酶中的一个融合的进化特征.
- 这些相互作用中介于甲基转移的通用机制,对酶功能至关重要.
- 了解这些相互作用为甲基转移酶的保存催化策略提供了基本的见解.
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