A kinetoplastid-specific kinesin is required for cytokinesis and for maintenance of cell morphology in Trypanosoma brucei.

A kinetoplastid-specific kinesin is required for cytokinesis and for maintenance of cell morphology in Trypanosoma brucei.
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细胞因子和维持锥虫锥虫的细胞形态所必需的动力质体特异性驱动蛋白。

DOI:
10.1111/j.1365-2958.2011.07951.x
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发表时间:
2012-02
影响因子:
3.6
通讯作者:
Li Z
Li Z
中科院分区:
生物学2区
文献类型:
--
作者:
Hu L;Hu H;Li Z

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驱动蛋白是一种基于运动的转运蛋白,在各种细胞过程中发挥着不同的作用。锥虫基因组缺乏许多保守的有丝分裂驱动蛋白的同源物,但编码一些锥虫特异性驱动蛋白,其功能未知。在这里,我们报告了TbKIN-C的生化和功能特性,TbKIN-C是一种锥虫特异性驱动蛋白,最初是通过T.布鲁塞。TbKIN-C在体外具有ATP酶活性,在体内与细胞骨架微管蛋白微管结合。它分布在整个细胞骨架中,在细胞周期的早期阶段,在细胞的后端具有局灶性富集。TbKIN-C的RNAi导致变形的细胞形状,具有充满酪氨酸化微管蛋白微管的伸长的后部。TbKIN-C的沉默损害了细胞器和细胞骨架结构的分离,并导致新鞭毛和一小部分细胞质的分离。我们还表明,TbKIN-C的RNAi损害胞质分裂,并取消了TbCPC 1,染色体乘客复合物的亚基,从中央纺锤体的胞质分裂的起始位点的反式定位。我们的研究结果表明,TbKIN-C在维持细胞形态方面发挥着重要作用,可能是通过调节细胞后端的微管动力学。
Kinesins are motor-based transport proteins that play diverse roles in various cellular processes. The trypanosome genome lacks the homologs of many conserved mitotic kinesins, but encodes a number of trypanosome-specific kinesins with unknown function. Here, we report the biochemical and functional characterization of TbKIN-C, a trypanosome-specific kinesin, which was initially identified through an RNAi screen for cytokinesis genes in T. brucei. TbKIN-C possesses in vitro ATPase activity and associates with cytoskeletal tubulin microtubules in vivo. It is distributed throughout the cytoskeleton with a focal enrichment at the posterior end of the cell during early cell cycle stages. RNAi of TbKIN-C resulted in distorted cell shape with an elongated posterior filled with tyrosinated tubulin microtubules. Silencing of TbKIN-C impaired the segregation of organelles and cytoskeletal structures and led to detachment of the new flagellum and a small portion of the cytoplasm. We also show that RNAi of TbKIN-C compromised cytokinesis and abolished the trans-localization of TbCPC1, a subunit of the chromosomal passenger complex, from the central spindle to the initiation site of cytokinesis. Our results suggest an essential role of TbKIN-C in maintaining cell morphology, likely through regulating microtubule dynamics at the posterior end of the cell.
DOI: 10.1371/journal.pone.0002354
发表时间: 2008-06-11
期刊: PloS one
影响因子: 3.7
作者:
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发表时间: 2002-05-03
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