A MAP6-related protein is present in protozoa and is involved in flagellum motility.

A MAP6-related protein is present in protozoa and is involved in flagellum motility.
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DOI:
10.1371/journal.pone.0031344
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Bonhivers M
Bonhivers M
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Dacheux D;Landrein N;Thonnus M;Gilbert G;Sahin A;Wodrich H;Robinson DR;Bonhivers M

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在脊椎动物中,微管相关蛋白MAP6和MAP6d1稳定耐寒的微管。纤毛和鞭毛具有冷稳定的微管,但在这些细胞器中尚未发现MAP6蛋白。在这里,我们将TbSAXO描述为第一个在布鲁氏锥虫原生动物中发现的MAP6相关蛋白。利用异源表达系统,我们证明TbSAXO是一种微管稳定蛋白。此外,我们还鉴定了负责微管结合和稳定的结构域,并表明它们与MAP6蛋白的微管稳定的MN结构域具有同源性。我们证明,在有鞭毛的寄生虫中,TbSAXO是一种轴丝蛋白,在鞭毛运动中发挥作用。最后,我们提供了TbSAXO属于一组MAP6相关蛋白(Saxo蛋白)的证据,该蛋白仅存在于从原生动物到哺乳动物的纤毛或鞭毛生物中。我们讨论了Saxo蛋白在纤毛和鞭毛功能中的潜在作用。
In vertebrates the microtubule-associated proteins MAP6 and MAP6d1 stabilize cold-resistant microtubules. Cilia and flagella have cold-stable microtubules but MAP6 proteins have not been identified in these organelles. Here, we describe TbSAXO as the first MAP6-related protein to be identified in a protozoan, Trypanosoma brucei. Using a heterologous expression system, we show that TbSAXO is a microtubule stabilizing protein. Furthermore we identify the domains of the protein responsible for microtubule binding and stabilizing and show that they share homologies with the microtubule-stabilizing Mn domains of the MAP6 proteins. We demonstrate, in the flagellated parasite, that TbSAXO is an axonemal protein that plays a role in flagellum motility. Lastly we provide evidence that TbSAXO belongs to a group of MAP6-related proteins (SAXO proteins) present only in ciliated or flagellated organisms ranging from protozoa to mammals. We discuss the potential roles of the SAXO proteins in cilia and flagella function.
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