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Basal body structure in Trichonympha

机译：Trichonympha的基础身体结构

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Trichonympha is a symbiotic flagellate of many species of termites and of the wood-feeding cockroach. Remarkably, this unicellular organism harbors up to over ten thousand flagella on its surface, which serve to propel it through the viscous environment of the host hindgut. In the 1960s, analysis of resin-embedded Trichonympha samples by electron microscopy revealed that the basal bodies that give rise to these flagella are exceptionally long, with a proximal, cartwheel-bearing, region some 50 times longer than that of regular centrioles. In recent years, this salient feature has prompted the analysis of the 3D architecture of Trichonympha basal bodies in the native state using cryo-electron tomography. The resulting ~40?? resolution map of the basal body proximal region revealed a number of novel features that may be conserved in centrioles of other systems. These include proximal–distal polarity of the pinhead structure that links the cartwheel to centriolar microtubules, as well as of the linker between the A and the C microtubules. Moreover, this work demonstrated that the cartwheel is made of stacked ring-like structures that likely each comprise 18 molecules of SAS-6 proteins.
机译：Trichonympha是许多种类的白蚁和以木材为食的蟑螂的共生鞭毛。值得注意的是，这种单细胞生物在其表面上藏有多达一万个鞭毛，可推动其穿过宿主后肠的粘性环境。在1960年代，通过电子显微镜对包埋有树脂的Trichonympha样品进行分析后发现，引起这些鞭毛的基体异常长，其近端带有车轮的区域比常规中心粒的区域长约50倍。近年来，这一显着特征促使人们使用冷冻电子断层扫描技术分析了原始状态下的Trichonympha基体的3D结构。结果〜40 ??基体近端区域的高分辨率图揭示了许多新颖的特征，这些特征可能在其他系统的中心体中得以保留。这些包括将车轮与中心微管连接的针头结构的近端至远端极性，以及A和C微管之间的连接件。此外，这项工作表明车轮由堆叠的环状结构组成，每个环状结构可能包含18个SAS-6蛋白分子。

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