Bend propagation drives central pair rotation in Chlamydomonas reinhardtii flagella.

Bend propagation drives central pair rotation in Chlamydomonas reinhardtii flagella.
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弯曲传播驱动中央对旋转中的中央对旋转。

DOI:
10.1083/jcb.200406148
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发表时间:
2004-08-30
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Nakatsugawa M
Nakatsugawa M
中科院分区:
其他
文献类型:
--
作者:
Mitchell DR;Nakatsugawa M

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活动的9+2纤毛和鞭毛的调节依赖于径向辐条和中央对装置之间的相互作用。虽然中心对在许多生物的鞭毛弯曲繁殖过程中旋转,并且旋转与扭曲的中心对结构相关,但中心对旋转和扭转的推动力是未知的。在这里,我们比较了直的,静止的鞭毛中的中心对构象,以及使用野生型莱茵衣藻和缺乏放射状轮辐头的突变体主动击打鞭毛时的中央对构象。在有无辐头的情况下,静止的鞭毛都会发生扭转,这表明辐条-中心对相互作用不需要产生扭矩来扭转。野生型和轮辐头突变品系在繁殖期弯曲的中心对取向也相似,因此取向是对弯曲形成的被动反应。这些结果表明,弯曲传播驱动中心对旋转,并表明中心对-径向辐条相互作用对动力蛋白的调节涉及中心对对弯曲平面变化的被动重新定向。
Regulation of motile 9+2 cilia and flagella depends on interactions between radial spokes and a central pair apparatus. Although the central pair rotates during bend propagation in flagella of many organisms and rotation correlates with a twisted central pair structure, propulsive forces for central pair rotation and twist are unknown. Here we compared central pair conformation in straight, quiescent flagella to that in actively beating flagella using wild-type Chlamydomonas reinhardtii and mutants that lack radial spoke heads. Twists occur in quiescent flagella in both the presence and absence of spoke heads, indicating that spoke–central pair interactions are not needed to generate torque for twisting. Central pair orientation in propagating bends was also similar in wild type and spoke head mutant strains, thus orientation is a passive response to bend formation. These results indicate that bend propagation drives central pair rotation and suggest that dynein regulation by central pair–radial spoke interactions involves passive central pair reorientation to changes in bend plane.
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