Cooperative dynamics of microtubule ensembles: polymerization forces and rescue-induced oscillations.
Cooperative dynamics of microtubule ensembles: polymerization forces and rescue-induced oscillations.
复制标题
微管群的协同动力学:聚合力和救援引起的振荡
DOI:
10.1103/physreve.87.012703
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发表时间:
2013
期刊:
影响因子:
--
通讯作者:
J. Kierfeld
中科院分区:
文献类型:
--
作者:
B. Zelinski;J. Kierfeld
We investigate the cooperative dynamics of an ensemble ofmicrotubules growing against an elastic barrier. Microtubules undergo so-called catastrophes, which are abrupt stochastic transitions from a growing to a shrinking state, and rescues, which are transitions back to the growing state. Microtubules can exert pushing or polymerization forces on an obstacle, such as an elastic barrier, if the growing end is in contact with the obstacle. We use dynamical mean-field theory and stochastic simulations to analyze a model where each microtubule undergoes catastrophes and rescues and where microtubules interact by force sharing. For zero rescue rate, cooperative growth terminates in a collective catastrophe. The maximal polymerization force before catastrophes grows linearly withfor smallor a stiff elastic barrier, in agreement with available experimental results, whereas it crosses over to a logarithmic dependence for largeror a soft elastic barrier. For a nonzero rescue rate and a soft elastic barrier, the dynamics becomes oscillatory with both collective catastrophe and rescue events, which are part of a robust limit cycle. Both the average and maximal polymerization forces then grow linearly with, and we investigate their dependence on tubulin on-rates and rescue rates, which can be involved in cellular regulation mechanisms. We further investigate the robustness of the collective catastrophe and rescue oscillations with respect to different catastrophe models.
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影响因子:
4
作者:
Pryer,NK;Walker,RA;Skeen,VP;Bourns,BD;Soboeiro,MF;Salmon,ED
通讯作者:
Salmon,ED
DOI:
10.1209/0295-5075/89/38010
发表时间:
2010
期刊:
EPL (Europhysics Letters)
影响因子:
--
作者:
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通讯作者:
J. Kierfeld
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作者:
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通讯作者:
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影响因子:
2.4
作者:
Flyvbjerg, H;Holy, TE;Leibler, S
通讯作者:
Leibler, S