Theoretical Analysis of Kinesin KIF1A Transport Along Microtubule

Theoretical Analysis of Kinesin KIF1A Transport Along Microtubule
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驱动蛋白 KIF1A 沿微管运输的理论分析

DOI:
10.1007/s10955-013-0804-y
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发表时间:
2013-07
影响因子:
1.6
通讯作者:
Yunxin Zhang
Yunxin Zhang
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Yunxin Zhang

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最近,提出了一种三态模型来描述非常规(单头)驱动蛋白KIF1A的细胞内运输(Phys.Rev.Lett.2004)。95:118101,2005),其中每个马达可以强或弱地结合到其微管轨道,并且轨道的每个结合位点可以是空的或被一个马达占据。与通常的两态模型,即带有运动分离和附着的完全不对称简单排斥过程(TASEP)一样,在系统的稳态下,该三态模型也表现出激波(或分隔高密度相和低密度相的畴壁)和边界层。本文利用平均场分析方法,从理论上得到了激波和边界层存在的条件。结合数值计算,对激波的性质进行了研究。本研究将有助于理解驱动蛋白KIF1A集体运输的生物物理特性。
Recently, a three-state model is presented to describe the intracellular traffic of unconventional (single-headed) kinesin KIF1A (Phys. Rev. Lett. 95:118101, 2005), in which each motor can bind strongly or weakly to its microtubule track, and each binding site of the track might be empty or occupied by one motor. As the usual two-state model, i.e. the totally asymmetric simple exclusion process (TASEP) with motor detachment and attachment, in steady state of the system, this three-state model also exhibits shock (or domain wall separating the high-density and low density phases) and boundary layers. In this study, using mean-field analysis, the conditions of existence of shock and boundary layers are obtained theoretically. Combined with numerical calculations, the properties of shock are also studied. This study will be helpful to understand the biophysical properties of the collective transport of kinesin KIF1A.
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