Fission yeast mitochondria are distributed by dynamic microtubules in a motor-independent manner.

Fission yeast mitochondria are distributed by dynamic microtubules in a motor-independent manner.
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裂殖酵母线粒体由动态微管以独立于运动的方式分布。

DOI:
10.1038/srep11023
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发表时间:
2015-06-05
期刊:
影响因子:
4.6
通讯作者:
Fu C
Fu C
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Li T;Zheng F;Cheung M;Wang F;Fu C

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细胞骨架在调节线粒体分布中起关键作用。与轴突线粒体相似,裂殖酵母线粒体由微管细胞骨架分布,但这是由依赖于微管相关蛋白MMB1p的马达独立机制调节的,因为MMB1p的缺乏导致线粒体聚集。在这项研究中,使用一系列的嵌合蛋白质来控制亚细胞定位和运动的线粒体,我们表明,嵌合分子含有微管结合域和线粒体外膜蛋白tom22 p可以恢复正常的相互连接的线粒体网络在mmb 1缺失(mmb 1缺失)细胞。相比之下,通过使用含有驱动蛋白运动域和tom22p的嵌合分子来增加线粒体的运动性,不能挽救mmb 1细胞中的线粒体聚集缺陷。有趣的是,携带肌动蛋白结合结构域和tom22 p的嵌合分子导致有丝分裂期间线粒体与肌动球蛋白环处的肌动蛋白丝相关,从而导致胞质分裂缺陷。这些发现表明,基于被动马达独立微管的机制是野生型裂殖酵母细胞中线粒体分布的主要贡献者。因此,我们建立的附件微管,而不是驱动蛋白依赖的运动和肌动蛋白细胞骨架,是必要的和至关重要的适当的线粒体分布在裂变酵母。
The cytoskeleton plays a critical role in regulating mitochondria distribution. Similar to axonal mitochondria, the fission yeast mitochondria are distributed by the microtubule cytoskeleton, but this is regulated by a motor-independent mechanism depending on the microtubule associated protein mmb1p as the absence of mmb1p causes mitochondria aggregation. In this study, using a series of chimeric proteins to control the subcellular localization and motility of mitochondria, we show that a chimeric molecule containing a microtubule binding domain and the mitochondria outer membrane protein tom22p can restore the normal interconnected mitochondria network in mmb1-deletion (mmb1∆) cells. In contrast, increasing the motility of mitochondria by using a chimeric molecule containing a kinesin motor domain and tom22p cannot rescue mitochondria aggregation defects in mmb1∆ cells. Intriguingly a chimeric molecule carrying an actin binding domain and tom22p results in mitochondria associated with actin filaments at the actomyosin ring during mitosis, leading to cytokinesis defects. These findings suggest that the passive motor-independent microtubule-based mechanism is the major contributor to mitochondria distribution in wild type fission yeast cells. Hence, we establish that attachment to microtubules, but not kinesin-dependent movement and the actin cytoskeleton, is required and crucial for proper mitochondria distribution in fission yeast.
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