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化EM结构揭示了小 NuA4 的乙化过程

Lin Wang^1,2, Haonan Zhang^1,3, Qi Jia²

¹Key Laboratory of Epigenetic Regulation and Intervention, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.

Proceedings of the National Academy of Sciences of the United States of America

|March 18, 2025

概括

酵母 NuA4 乙转移酶使用多种构造来寻找基质,并优先在 H2A.Z. 之前乙化 H4 基因组. 这项研究揭示了微小NuA4 (pNuA4) 在核细胞上复杂的乙化机制.

科学领域:

表观遗传学和基因调控
结构生物学结构生物学
生物化学生物化学

背景情况:

NuA4是酵母中唯一必需的乙转移酶,对通过基因素乙化进行基因转录至关重要.
通过NuA4对H4和H2A.Z基因素进行乙化的精确机制尚不清楚.

研究的目的:

阐明小 NuA4 (pNuA4) 在 H4 和 H2A.Z 中含有 H2A.Z 的核细胞体内的乙化机制.
在基质结合和乙化过程中捕获pNuA4的结构快照.

主要方法:

低温电子显微镜 (cryo-EM) 单颗粒分析以确定pNuA4-核体复合物的结构.
单分子福斯特共振能量转移 (smFRET) 用于研究动态形状变化.

主要成果:

观察到多个pNuA4构造,在没有乙辅酶A (Ac-CoA) 的情况下寻找基质.
在添加Ac-CoA时,pNuA4对H4乙化有明显的偏好,涉及动态形状变化.
捕获了与H2A.Z乙化相关的pNuA4的新型结构.

结论:

通过pNuA4对H4和H2A.Z的乙化过程是复杂的,涉及不同的步骤和形状动态.
这项研究提供了详细的pNuA4基质在核细胞内乙化的机制.

关键词:

在 NuA4A4 中.乙烯基转移酶的使用方法低温电磁波冷却器 (Cryo-EM) 是一个非常好的方法.基因素乙化基因素乙化基因素乙化一个分子光共振能量转移 (smFRET)

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相关概念视频

Cryo-electron Microscopy

Cryo-electron Microscopy

Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...