Trypanin is a cytoskeletal linker protein and is required for cell motility in African trypanosomes.

Trypanin is a cytoskeletal linker protein and is required for cell motility in African trypanosomes.
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DOI:
10.1083/jcb.200201036
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发表时间:
2002-03-04
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Hill KL
Hill KL
中科院分区:
其他
文献类型:
--
作者:
Hutchings NR;Donelson JE;Hill KL

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真核细胞的细胞骨架由不同但相互连接的丝状系统构成的复杂网络组成,这些系统在细胞分裂、细胞运动以及蛋白质和细胞器的亚细胞运输中发挥作用。我们对这一动态网络理解的一个空白是鉴定连接细胞骨架结构子集的蛋白质。我们先前发现了一个细胞骨架相关蛋白家族,其中包括GAS11(一种在生长停滞细胞中上调的人类肿瘤抑制候选蛋白)和锥虫素(非洲锥虫鞭毛细胞骨架的一个组分)。尽管这些蛋白与细胞骨架密切相关,但它们的功能尚未确定。在此,我们利用双链RNA干扰来阻断布氏锥虫中锥虫素的表达,并证明这种蛋白是定向细胞运动所必需的。锥虫素缺失突变体具有活跃的鞭毛,但无法协调鞭毛的摆动。因此,它们不受控制地旋转和翻滚,偶尔会向后移动。免疫荧光实验表明锥虫素位于鞭毛/鞭毛附着区,电子显微镜分析显示在锥虫素缺失突变体中,鞭毛器和表膜下细胞骨架之间的细胞骨架连接不稳定。这些结果表明锥虫素作为一种细胞骨架连接蛋白发挥作用,并为基于鞭毛的细胞运动机制提供了见解。
The cytoskeleton of eukaryotic cells is comprised of a complex network of distinct but interconnected filament systems that function in cell division, cell motility, and subcellular trafficking of proteins and organelles. A gap in our understanding of this dynamic network is the identification of proteins that connect subsets of cytoskeletal structures. We previously discovered a family of cytoskeleton-associated proteins that includes GAS11, a candidate human tumor suppressor upregulated in growth-arrested cells, and trypanin, a component of the flagellar cytoskeleton of African trypanosomes. Although these proteins are intimately associated with the cytoskeleton, their function has yet to be determined. Here we use double-stranded RNA interference to block trypanin expression in Trypanosoma brucei, and demonstrate that this protein is required for directional cell motility. Trypanin(−) mutants have an active flagellum, but are unable to coordinate flagellar beat. As a consequence, they spin and tumble uncontrollably, occasionally moving backward. Immunofluorescence experiments demonstrate that trypanin is located along the flagellum/flagellum attachment zone and electron microscopic analysis revealed that cytoskeletal connections between the flagellar apparatus and subpellicular cytoskeleton are destabilized in trypanin(−) mutants. These results indicate that trypanin functions as a cytoskeletal linker protein and offer insights into the mechanisms of flagellum-based cell motility.
免疫主导锥虫表面糖蛋白的删除破坏鞭毛 - 细胞粘附。
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