CLASP1 and CLASP2 bind to EB1 and regulate microtubule plus-end dynamics at the cell cortex.

CLASP1 and CLASP2 bind to EB1 and regulate microtubule plus-end dynamics at the cell cortex.
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DOI:
10.1083/jcb.200405094
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发表时间:
2005-01-03
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Akhmanova A
Akhmanova A
中科院分区:
其他
文献类型:
--
作者:
Mimori-Kiyosue Y;Grigoriev I;Lansbergen G;Sasaki H;Matsui C;Severin F;Galjart N;Grosveld F;Vorobjev I;Tsukita S;Akhmanova A

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Clip-Associating Protein(CLASP)1和CLASP2是哺乳动物微管(MT)正端结合蛋白,与CLIP-170和CLIP-115相关。利用HeLa细胞中的RNA干扰,我们证明了这两个环在调节间期MTS的密度、长度分布和稳定性方面起着多余的作用。在HeLa细胞中,两个扣环都集中在细胞边缘狭窄区域的远端MT末端。CLAP通过促进停顿和限制MT的生长和缩短对该外围细胞区域的发作来稳定MTS。我们证明了CLASPS的中间部分直接与EB1和MTS结合。此外,我们还证明了CLASP2与细胞皮质的结合是MT不依赖的,并且依赖于它的COOH-末端结构域。CLAP的EB1和皮质结合结构域都是促进MT稳定性所必需的。我们认为,CLASPS可以介导MT plus末端与细胞皮质之间的相互作用,并作为局部救援因子,可能是通过在MT末端与EB1形成复合体来实现的。
CLIP-associating protein (CLASP) 1 and CLASP2 are mammalian microtubule (MT) plus-end binding proteins, which associate with CLIP-170 and CLIP-115. Using RNA interference in HeLa cells, we show that the two CLASPs play redundant roles in regulating the density, length distribution and stability of interphase MTs. In HeLa cells, both CLASPs concentrate on the distal MT ends in a narrow region at the cell margin. CLASPs stabilize MTs by promoting pauses and restricting MT growth and shortening episodes to this peripheral cell region. We demonstrate that the middle part of CLASPs binds directly to EB1 and to MTs. Furthermore, we show that the association of CLASP2 with the cell cortex is MT independent and relies on its COOH-terminal domain. Both EB1- and cortex-binding domains of CLASP are required to promote MT stability. We propose that CLASPs can mediate interactions between MT plus ends and the cell cortex and act as local rescue factors, possibly through forming a complex with EB1 at MT tips.
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