纳米尺度的细胞内超结构受到透压的影响,使用小角度X射线散射
Masaru Nakada1, Junko Kanda1, Hironobu Uchiyama1
1Toray Research Center, Inc., 2-11 Sonoyama 3-chome, Otsu, Shiga 520-8567, Japan.
Biophysical chemistry
|July 9, 2024
概括
微角X射线散射揭示了活细胞中的纳米级细胞内结构. 核糖体随着透压力改变大小,而等离子体膜在高压下形成多层状结构.
科学领域:
- 细胞生物学 细胞生物学
- 生物物理学的生物物理.
- 结构生物学 结构生物学
背景情况:
- 在活细胞中观察纳米级细胞内超结构是传统显微镜的挑战.
- 限制包括光显微镜中的空间分辨率和电子显微镜中高真空的需要.
研究的目的:
- 为了研究在不同度下活着的中国仓鼠卵巢 (CHO) 细胞的纳米级细胞内超结构.
- 观察核糖体,DNA双螺旋和等离子体膜的现场结构.
主要方法:
- 利用小角度X射线散射 (SAXS) 来分析活的CHO细胞.
- 对不同透压力 (透性) 的细胞反应进行了检查.
主要成果:
- 观察到核糖体在透压力下膨胀和收缩,在同位素和超透条件下显示了核糖体间的相关性.
- DNA双螺旋结构保持独立于透压力.
- 高透压诱导了等离子体膜折叠成具有~6nm周期长度的多叶膜结构.
- 还分析了由于甲固定,冷和加热的超结构变化.
结论:
- 萨克斯为研究活细胞中纳米级细胞内动力学提供了一种可行的方法.
- 奥斯摩斯压力显著影响核糖体结构和血组织.
- 细胞超结构对环境变化和固定方法表现出不同的反应.
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