Revolving movement of a dynamic cluster of actin filaments during mitosis.

Revolving movement of a dynamic cluster of actin filaments during mitosis.
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DOI:
10.1083/jcb.201007136
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发表时间:
2010-11-01
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Nishida E
Nishida E
中科院分区:
其他
文献类型:
--
作者:
Mitsushima M;Aoki K;Ebisuya M;Matsumura S;Yamamoto T;Matsuda M;Toyoshima F;Nishida E

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Arp2/3 actin filament nucleating complex drives circumnavigation of cortical actin clusters during mitosis. The actin cytoskeleton undergoes rapid changes in its architecture during mitosis. Here, we demonstrate novel actin assembly dynamics in M phase. An amorphous cluster of actin filaments appears during prometaphase, revolves horizontally along the cell cortex at a constant angular speed, and fuses into the contractile ring after three to four revolutions. Cdk1 activity is required for the formation of this mitotic actin cluster and its revolving movement. Rapid turnover of actin in the filaments takes place everywhere in the cluster and is also required for its cluster rotation during mitosis. Knockdown of Arp3, a component of the actin filament–nucleating Arp2/3 complex, inhibits the formation of the mitotic actin cluster without affecting other actin structures. These results identify Arp2/3 complex as a key factor in the generation of the dynamic actin cluster during mitosis.
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