从极化光显微镜对酵母隔膜组织的结构洞察力
Alina M Vrabioiu1, Timothy J Mitchison
1Department of Systems Biology, Harvard Medical School, 200 Longwood Avenue, Boston, Massachusetts 02115, USA. alina_vrabioiu@student.hms.harvard.edu
Nature
|September 29, 2006
概括
七素,对于细胞分裂至关重要,从一个沙钟转变为环状结构. 细丝沿着芽线对齐,然后在酵母细胞分裂过程中旋转形成环形环.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物物理学的生物物理.
背景情况:
- 七是细胞分裂和皮层组织至关重要的GTPase.
- 在酵母菌中,七在芽部形成动态的沙钟结构,在细胞运动过程中转化为环.
- 这些隔膜结构中的精确丝组织一直是争论的主题.
研究的目的:
- 阐明在酵母细胞分裂过程中,在钟和环结构中的细丝组织和隔膜的动力学.
- 为了解决围绕隔膜丝组织的争议,in vivo.
主要方法:
- 使用极化光显微镜.
- 在活的酵母细胞中使用定向受约束的绿色光蛋白 (GFP).
- 实时观察隔膜丝组织和动态.
主要成果:
- 证明了沙钟结构中的隔膜丝在酵母芽子沿着酵母芽子对齐.
- 显示在过渡到环时,这些细丝在膜平面内旋转90度.
- 证实了周围隔膜环的形成.
结论:
- 解决了长期存在的关于细胞分裂期间隔膜丝组织的争议.
- 提供了强有力的证据,证明 septins 在细胞分裂过程中的机械作用.
- 建立了酵母细胞运动中的隔膜丝重新排列的动态模型.
相关概念视频
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