Roles of type II myosin and a tropomyosin isoform in retrograde actin flow in budding yeast.

Roles of type II myosin and a tropomyosin isoform in retrograde actin flow in budding yeast.
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DOI:
10.1083/jcb.200609155
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发表时间:
2006-12-18
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Pon LA
Pon LA
中科院分区:
其他
文献类型:
--
作者:
Huckaba TM;Lipkin T;Pon LA

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皮质肌动蛋白网络和束的逆行流动对于细胞运动和逆行细胞内运动以及微绒毛、静纤毛和丝状伪足的形成和维持是必不可少的。肌动蛋白电缆,这是F-肌动蛋白束,作为轨道的顺行和逆行货物运动在芽殖酵母,经历逆行流动,这是驱动,部分,由肌动蛋白聚合和组装。我们发现,肌动蛋白电缆逆行流速减少删除或离域的II型肌球蛋白Myo 1 p,和删除或条件突变的Myo 1 p马达结构域。删除原肌球蛋白亚型Tpm 2 p,而不是Tpm 1 p亚型,增加肌动蛋白电缆逆行流的速率。用Tpm 2 p而不是Tpm 1 p预处理F-肌动蛋白,抑制Myo 1 p与F-肌动蛋白的结合和Myo 1 p依赖的F-肌动蛋白滑动。这些数据支持新的,相反的作用Myo 1 p和Tpm 2在调节逆行肌动蛋白流在芽殖酵母和Tpm 1 p的异构体特异性功能,促进肌动蛋白电缆功能肌球蛋白驱动的顺行货物运输。
Retrograde flow of cortical actin networks and bundles is essential for cell motility and retrograde intracellular movement, and for the formation and maintenance of microvilli, stereocilia, and filopodia. Actin cables, which are F-actin bundles that serve as tracks for anterograde and retrograde cargo movement in budding yeast, undergo retrograde flow that is driven, in part, by actin polymerization and assembly. We find that the actin cable retrograde flow rate is reduced by deletion or delocalization of the type II myosin Myo1p, and by deletion or conditional mutation of the Myo1p motor domain. Deletion of the tropomyosin isoform Tpm2p, but not the Tpm1p isoform, increases the rate of actin cable retrograde flow. Pretreatment of F-actin with Tpm2p, but not Tpm1p, inhibits Myo1p binding to F-actin and Myo1p-dependent F-actin gliding. These data support novel, opposing roles of Myo1p and Tpm2 in regulating retrograde actin flow in budding yeast and an isoform-specific function of Tpm1p in promoting actin cable function in myosin-driven anterograde cargo transport.
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