Tektin 2 is required for central spindle microtubule organization and the completion of cytokinesis.

Tektin 2 is required for central spindle microtubule organization and the completion of cytokinesis.
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Tektin 2是中央纺锤体微管组织所必需的,并完成细胞因子。

DOI:
10.1083/jcb.200711160
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发表时间:
2008-05-19
影响因子:
7.8
通讯作者:
Hinchcliffe, Edward H.
Hinchcliffe, Edward H.
中科院分区:
生物学1区
文献类型:
--
作者:
Durcan, Thomas M.;Halpin, Elizabeth S.;Rao, Trisha;Collins, Nicholas S.;Tribble, Emily K.;Hornick, Jessica E.;Hinchcliffe, Edward H.

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在后期,纺锤体中区的非动粒微管紧凑成中心纺锤体,这是启动和完成细胞质分裂所必需的结构。我们发现Tektin 2(Tek2)在整个有丝分裂过程中与纺锤体极结合,在有丝分裂后期组织纺锤体中区微管,并在胞质分裂期间组装成围绕致密的中区微管的中体基质。Tek2小干扰RNA(SiRNA)破坏了中心纺锤体的组织和MKLP1、PRC1和Aurora B在中区的正确定位,阻止了中体基质的形成。视频显微镜显示,Tek2的缺失导致胞质分裂后的子细胞异常融合,形成双核细胞。尽管一种肌球蛋白II的抑制剂,Blebbistatin,可以阻止肌动蛋白-肌球蛋白的收缩,但中央纺锤体的微管是致密的。引人注目的是,Tek2 siRNA取消了这种肌动蛋白依赖的中区微管紧致。因此,在细胞分裂后期依赖于Tek2的中央纺锤体的组织对于适当的中体形成和胞质分裂后子代细胞的分离是必不可少的。
During anaphase, the nonkinetochore microtubules in the spindle midzone become compacted into the central spindle, a structure which is required to both initiate and complete cytokinesis. We show that Tektin 2 (Tek2) associates with the spindle poles throughout mitosis, organizes the spindle midzone microtubules during anaphase, and assembles into the midbody matrix surrounding the compacted midzone microtubules during cytokinesis. Tek2 small interfering RNA (siRNA) disrupts central spindle organization and proper localization of MKLP1, PRC1, and Aurora B to the midzone and prevents the formation of a midbody matrix. Video microscopy revealed that loss of Tek2 results in binucleate cell formation by aberrant fusion of daughter cells after cytokinesis. Although a myosin II inhibitor, blebbistatin, prevents actin-myosin contractility, the microtubules of the central spindle are compacted. Strikingly, Tek2 siRNA abolishes this actin-myosin–independent midzone microtubule compaction. Thus, Tek2-dependent organization of the central spindle during anaphase is essential for proper midbody formation and the segregation of daughter cells after cytokinesis.
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