ER sliding dynamics and ER-mitochondrial contacts occur on acetylated microtubules.

ER sliding dynamics and ER-mitochondrial contacts occur on acetylated microtubules.
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DOI:
10.1083/jcb.200911024
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发表时间:
2010-08-09
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Voeltz GK
Voeltz GK
中科院分区:
其他
文献类型:
--
作者:
Friedman JR;Webster BM;Mastronarde DN;Verhey KJ;Voeltz GK

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ER和线粒体的运动是通过ER与一组后修饰微管的有限相互作用来偶联的。内质网(ER)网络在动物细胞中是非常动态的,但对其运动的机制和功能知之甚少。最常见的ER动力学,称为ER滑动,涉及ER小管沿沿着稳定微管(MT)延伸。在这项研究中,我们表明,ER滑动发生在nocodazole耐药的MT,通过乙酰化后修饰。我们证明,高MT曲率是MT乙酰化的一个很好的指标,并显示在活细胞中,ER滑动主要发生在这些弯曲的乙酰化MT上。此外,通过药物治疗增加MT乙酰化增加ER滑动的频率。ER在修饰的MT束上滑动的一个目的可能是调节其细胞器间的接触。我们发现,所有的线粒体和许多内体保持与ER的接触,尽管每个运动。然而,线粒体,而不是内体,优先定位于乙酰化的MT。因此,不同的ER动力学可能发生在不同的MT群体上,以建立或维持与不同细胞器的接触。
Movement of the ER and mitochondria is coupled by limited interactions of the ER with a subset of posttranslationally modified microtubules. The endoplasmic reticulum (ER) network is extremely dynamic in animal cells, yet little is known about the mechanism and function of its movements. The most common ER dynamic, termed ER sliding, involves ER tubule extension along stable microtubules (MTs). In this study, we show that ER sliding occurs on nocodazole-resistant MTs that are posttranslationally modified by acetylation. We demonstrate that high MT curvature is a good indicator of MT acetylation and show in live cells that ER sliding occurs predominantly on these curved, acetylated MTs. Furthermore, increasing MT acetylation by drug treatment increases the frequency of ER sliding. One purpose of the ER sliding on modified MT tracts could be to regulate its interorganelle contacts. We find that all mitochondria and many endosomes maintain contact with the ER despite the movements of each. However, mitochondria, but not endosomes, preferentially localize to acetylated MTs. Thus, different ER dynamics may occur on distinct MT populations to establish or maintain contacts with different organelles.
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