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Updated: Jul 12, 2025

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化电磁波揭示了化体如何组装并对环境信号变化做出反应

Yue Wang¹, Jun Yang¹, Fangheng Hu¹

¹Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, USA.

The Journal of cell biology

|October 26, 2023

概括

用冷EM揭示了对前列腺鞭毛具有关键作用的形体的结构. 这些弹性细丝会影响细胞的运动性,特别是在具有挑战性的环境中.

科学领域:

细胞生物学细胞生物学
结构生物学结构生物学
生物物理学的生物物理.

背景情况:

乳腺膜是前列腺鞭毛上的有丝状附属物.
在Chlamydomonas reinhardtii中,它们与PKD2有关,这表明它们在信号传感和运动性方面的作用.
它们的精确结构和功能在很大程度上仍然没有被描述.

研究的目的:

为了确定高分辨率结构的mastigonemes.
为了阐明马斯蒂戈内姆丝线的组装和结构特性.
为了研究菌体结构对细胞移动性的功能影响.

主要方法:

单粒子冷电子显微镜 (cryo-EM) 在3.4 Å分辨率.
对MST1灯丝单元的结构分析.
在各种环境条件下评估细胞游泳行为.

主要成果:

马斯蒂戈内姆丝片单元 (MST1) 的结构得到了解析,揭示了具有聚二螺旋的免疫球体样和寿司域.
MST1子单元组装成一个中心对称的,非极性丝,由多个二硫化物键稳定.
马斯蒂冈的结构缺陷影响了特定的游泳特性,特别是在环境压力下 (氧化减排转移,高粘度).

结论:

这项研究提供了第一个高分辨率的结构,一个mastigoneme丝.
由于二硫化物结合,马斯蒂戈内姆具有固有的结构弹性.
巨体在调节原生体中鞭毛体运动和环境反应方面发挥着重要作用.

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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...