Microtubule dynamic instability: a new model with coupled GTP hydrolysis and multistep catastrophe.

Microtubule dynamic instability: a new model with coupled GTP hydrolysis and multistep catastrophe.
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DOI:
10.1002/bies.201200131
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发表时间:
2013-05
期刊:
影响因子:
4
通讯作者:
Howard, Jonathon
Howard, Jonathon
中科院分区:
生物学3区
文献类型:
--
作者:
Bowne-Anderson, Hugo;Zanic, Marija;Kauer, Monika;Howard, Jonathon

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理解微管动力学的一个关键问题是GTP水解如何导致灾难,即从缓慢生长到快速收缩的转变。我们首先提供了一个实验和建模文献的回顾,然后提出了一个新的模型微管动力学。我们表明,矢量,随机,耦合水解机制是不一致的依赖微管蛋白浓度的灾难,并表明,虽然单原丝模型可以解释许多功能的动态,他们不描述灾难作为一个多步骤的过程。最后,我们提出了一个新的组合(耦合加随机水解)多原丝模型,这是一个简单的,解析可解的推广单原丝模型。该模型解释了观察到的生长微管的寿命,稀释后的灾难延迟,并将灾难描述为一个多步骤的过程。
A key question in understanding microtubule dynamics is how GTP hydrolysis leads to catastrophe, the switch from slow growth to rapid shrinkage. We first provide a review of the experimental and modeling literature, and then present a new model of microtubule dynamics. We demonstrate that vectorial, random, and coupled hydrolysis mechanisms are not consistent with the dependence of catastrophe on tubulin concentration and show that, although single-protofilament models can explain many features of dynamics, they do not describe catastrophe as a multistep process. Finally, we present a new combined (coupled plus random hydrolysis) multiple-protofilament model that is a simple, analytically solvable generalization of a single-protofilament model. This model accounts for the observed lifetimes of growing microtubules, the delay to catastrophe following dilution and describes catastrophe as a multistep process.
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