动态溶液结构的整体人类NAP1滴度器绑定到一个和两个色素H2A-H2B异构体,通过整合方法获得
Hideaki Ohtomo1, Tsutomu Yamane2, Takashi Oda3
1Graduate School of Medical Life Science, Yokohama City University, 1-7-29 Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japan.
Journal of molecular biology
|June 28, 2023
概括
核细胞组合蛋白1 (NAP1) 结合了组基因子二次体,其核心域与第一个二次体相互作用,CTAD与第二个相互作用. 这揭示了从核细胞体中逐步驱逐的质子结合机制.
科学领域:
- 分子生物学分子生物学
- 染色体动力学 染色体动力学
- 蛋白质结构和功能 蛋白质结构和功能
背景情况:
- 核细胞组合蛋白1 (NAP1) 对于色素H2A-H2B二元体沉积和驱逐至关重要.
- 人类NAP1 (hNAP1) 有一个核心域和一个C端酸性域 (CTAD),两者都对结合基因素至关重要.
- 对于hNAP1的核心和CTAD域在基因素结合中的不同作用仍然不清楚.
研究的目的:
- 阐明全长hNAP1结合素H2A-H2B异构体的动态结构机制.
- 了解核心和CTAD领域对hNAP1在组素结合和核细胞组动态中的功能的具体贡献.
- 开发一种hNAP1介导的组蛋白驱逐模型.
主要方法:
- 综合结构生物学方法,包括核磁共振 (NMR) 光谱学.
- 原子力显微镜 (AFM) 用于研究hNAP1的寡合化.
- 生物物理技术,如大小排除色谱 (SEC),多角度光散射 (MALS) 和小角度X射线散射 (SAXS).
- 计算建模和分子动力学 (MD) 模拟.
主要成果:
- hNAP1形成双重重复的二元体,并为结构研究生成了一个稳定的二元突变体.
- 第一个H2A-H2B二分体主要与hNAP1核心域结合.
- 第二个H2A-H2B二元体与hNAP1.1的CTAD动态结合.
- 核磁共振证实了CTAD与H2A-H2B的结合.
结论:
- 已经建立了一个hNAP1与素H2A-H2B二次体结合的逐步模型.
- 核心和CTAD域在调解基质子结合和促进核酶体动力学方面发挥着不同的,顺序的作用.
- 这些发现提供了对由NAP1.1调解的基因素驱逐机制的关键见解.
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