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arXiv 1002.2987cond-mat.softphysics.bio-phq-bio.SC
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细胞膜脂链的动态提取模型

Models of dynamic extraction of lipid tethers from cell membranes

S. Nowak, T. Chou

摘要:

当与完整的膜受体结合的配体被拉动时,膜和下面的细胞骨架可以在膜从细胞骨架脱层或配体从受体分离之前变形。如果膜从细胞骨架脱层,它可能会被进一步挤压并形成膜系链。我们开发了一个现象学模型,这个过程假设变形服从胡克定律的临界力,在该临界力下,细胞膜局部脱离细胞骨架和膜系链的形式。我们计算系绳形成的概率,并表明,它们只能在一个中间范围内的力加载速率和拉速度被挤出。计算配体脱离时产生的平均系链长度,以及产生最长系链的力加载速率和牵拉速度。

英文摘要:

When a ligand that is bound to an integral membrane receptor is pulled, the membrane and the underlying cytoskeleton can deform before either the membrane delaminates from the cytoskeleton or the ligand detaches from the receptor. If the membrane delaminates from the cytoskeleton, it may be further extruded and form a membrane tether. We develop a phenomenological model for this processes by assuming that deformations obey Hooke's law up to a critical force at which the cell membrane locally detaches from the cytoskeleton and a membrane tether forms. We compute the probability of tether formation and show that they can be extruded only within an intermediate range of force loading rates and pulling velocities. The mean tether length that arises at the moment of ligand detachment is computed as are the force loading rates and pulling velocities that yield the longest tethers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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