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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >DIFFUSION AND FORMATION OF MICROTUBULE ASTERS - PHYSICAL PROCESSES VERSUS BIOCHEMICAL REGULATION
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DIFFUSION AND FORMATION OF MICROTUBULE ASTERS - PHYSICAL PROCESSES VERSUS BIOCHEMICAL REGULATION

机译:微管ASTER的扩散和形成-物理过程与生物化学调控

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摘要

Microtubule asters forming the mitotic spindle are assembled around two centrosomes through the process of dynamic instability in which microtubules alternate between growing and shrinking states. By modifying the dynamics of this assembly process, cell cycle enzymes, such as cdc2 cyclin kinases, regulate length distributions in the asters. It is believed that the same enzymes control the number of assembled microtubules by changing the ''nucleating activity'' of the centrosomes. Here we show that assembly of microtubule asters may be strongly altered by effects connected with diffusion of tubulin monomers. Theoretical analysis of a simple model describing assembly of microtubule asters clearly shows the existence of a region surrounding the centrosome depleted in GTP tubulin. The number of assembled microtubules may in some cases be limited by this depletion effect rather than by the number of available nucleation sites on the centrosome. [References: 26]
机译:形成有丝分裂纺锤体的微管紫苑通过动态不稳定性过程围绕两个中心体组装,其中微管在生长状态和收缩状态之间交替。通过改变组装过程的动力学,细胞周期酶(例如cdc2细胞周期蛋白激酶)可调节紫the中的长度分布。相信相同的酶通过改变中心体的“成核活性”来控制组装的微管的数量。在这里,我们显示微管紫苑的大会可能会通过与微管蛋白单体的扩散有关的影响而大大改变。对描述微管紫组装的简单模型的理论分析清楚地表明,围绕着GTP微管蛋白消耗的中心体存在着一个区域。在某些情况下,组装的微管的数量可能受到这种耗尽效应的限制,而不是受到中心体上可用成核位点的数量的限制。 [参考:26]

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