Properties of the kinetochore in vitro. II. Microtubule capture and ATP-dependent translocation.

Properties of the kinetochore in vitro. II. Microtubule capture and ATP-dependent translocation.
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DOI:
10.1083/jcb.101.3.766
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发表时间:
1985-09
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Kirschner MW
Kirschner MW
中科院分区:
其他
文献类型:
--
作者:
Mitchison TJ;Kirschner MW

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我们研究了预形成的微管(MT)与孤立染色体的动粒的相互作用。这种反应,我们称之为MT捕获,导致MT与动粒紧密结合,其末端被限制以防止解聚。这些观察结果,结合MT动态不稳定性,提出了一个纺锤体形态发生的模型。此外,ATP似乎动员动态过程中捕获MT结束。我们使用生物素标记的MT种子,遵循装配动力学在动粒。在ATP和未标记的微管蛋白的存在下,标记的MT片段通过在连接端的亚基的聚合而易位远离动粒。我们称这种反应为近端组装。进一步的研究表明,易位可以从MT组装中解偶联。我们认为,动粒含有ATP酶活性,走沿着MT晶格向正端。这种活动可能是负责染色体的运动远离极在前中期。
We have studied the interaction of preformed microtubules (MTs) with the kinetochores of isolated chromosomes. This reaction, which we call MT capture, results in MTs becoming tightly bound to the kinetochore, with their ends capped against depolymerization. These observations, combined with MT dynamic instability, suggest a model for spindle morphogenesis. In addition, ATP appears to mobilize dynamic processes at captured MT ends. We used biotin-labeled MT seeds to follow assembly dynamics at the kinetochore. In the presence of ATP and unlabeled tubulin, labeled MT segments translocate away from the kinetochore by polymerization of subunits at the attached end. We have termed this reaction proximal assembly. Further studies demonstrated that translocation could be uncoupled from MT assembly. We suggest that the kinetochore contains an ATPase activity that walks along the MT lattice toward the plus end. This activity may be responsible for the movement of chromosomes away from the pole in prometaphase.
DOI: 10.1016/0022-2836(74)90381-7
发表时间: 1974-01-01
影响因子: 5.6
作者:
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动力学在体外的特性。 I.微管成核和微管蛋白结合。
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发表时间: 1985-09
影响因子: 7.8
作者:
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通讯作者: KIRSCHNER, MW
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发表时间: 1985-04
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