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:
影响因子:
--
通讯作者:
Voeltz GK
中科院分区:
文献类型:
--
作者:
Friedman JR;Webster BM;Mastronarde DN;Verhey KJ;Voeltz GK
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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