Centrin3 in trypanosomes maintains the stability of a flagellar inner-arm dynein for cell motility

Centrin3 in trypanosomes maintains the stability of a flagellar inner-arm dynein for cell motility
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锥虫中的 Centrin3 维持鞭毛内臂动力蛋白的稳定性以促进细胞运动

DOI:
10.1038/ncomms5060
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发表时间:
2014-06-01
影响因子:
16.6
通讯作者:
Li, Ziyin
Li, Ziyin
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Wei, Ying;Hu, Huiqing;Li, Ziyin

文献摘要

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Centrin 是动物中心粒和有鞭毛生物基体的保守成分。它还与轴丝内臂动力蛋白相关并调节细胞运动,但潜在的机制仍然难以捉摸。在布氏锥虫中,五个中心蛋白中的三个与鞭毛基体相关,但尚未发现中心蛋白可以调节鞭毛运动。在这里,我们证明 TbCentrin3 是一种鞭毛蛋白,TbCentrin3 的敲低会损害细胞运动性。串联亲和纯化和质谱分析鉴定出臂内动力蛋白 TbIAD5-1 作为 TbCentrin3 伴侣,并且 TbIAD5-1 的敲低会导致类似的细胞运动缺陷。此外,我们证明了 TbCentrin3 和 TbIAD5-1 在维持鞭毛轴丝中稳定复合物方面的相互依赖性。总之,这些结果确定了 TbCentrin3 通过维持鞭毛中臂内动力蛋白的稳定性而在细胞运动中的重要作用,这可能是所有含有中心蛋白的鞭毛和纤毛生物所共有的。
Centrin is a conserved component of centrioles in animals and basal bodies in flagellated organisms. It also associates with axonemal inner-arm dyneins and regulates cell motility, but the underlying mechanism remains elusive. InTrypanosoma brucei, three of the five centrins associate with the flagellar basal body, but no centrin has been found to regulate flagellar motility. Here we show that TbCentrin3 is a flagellar protein and knockdown of TbCentrin3 compromises cell motility. Tandem affinity purification followed by mass spectrometry identifies an inner-arm dynein, TbIAD5-1, as the TbCentrin3 partner, and knockdown of TbIAD5-1 causes similar cell motility defect. Further, we demonstrate the interdependence of TbCentrin3 and TbIAD5-1 for maintaining a stable complex in the flagellar axoneme. Together, these results identify the essential role of TbCentrin3 in cell motility by maintaining the stability of an inner-arm dynein in the flagellum, which may be shared by all the centrin-containing flagellated and ciliated organisms.