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arXiv 2007.10606physics.bio-phcond-mat.soft
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机械力化学反馈下膜上反应扩散系统的斑图形成

Pattern Formation in Reaction-Diffusion System on Membrane with Mechanochemical Feedback

Naoki Tamemoto, Hiroshi Noguchi

摘要:

在活细胞中,生物膜的粘附是动态调节的。虽然蛋白质在热平衡下的膜变形已经被广泛研究,但非平衡动力学的研究要少得多。最近,化学反应的传播已被实验观察到质膜。因此,重要的是要了解如何在可变形弯曲膜上修改反应扩散动力学。在这里,我们研究了非平衡态斑图形成的膜变形和化学反应之间的机械化学反馈引起的囊泡,使用动态三角形膜模拟结合的mixselator模型。我们发现,膜变形的变化稳定的模式相对于那些发生在一个不变形的曲面上,由线性稳定性分析确定。我们进一步发现,出芽和多纺锤体的形状诱导图灵模式,我们还观察到从振荡模式到稳定的斑点模式的过渡。我们的研究结果表明,在变形膜上的斑图形成的机械化学反馈的重要性。

英文摘要:

Shapes of biological membranes are dynamically regulated in living cells. Although membrane shape deformation by proteins at thermal equilibrium has been extensively studied, nonequilibrium dynamics have been much less explored. Recently, chemical reaction propagation has been experimentally observed in plasma membranes. Thus, it is important to understand how the reaction-diffusion dynamics are modified on deformable curved membranes. Here, we investigated nonequilibrium pattern formation on vesicles induced by mechanochemical feedback between membrane deformation and chemical reactions, using dynamically triangulated membrane simulations combined with the Brusselator model. We found that membrane deformation changes stable patterns relative to those that occur on a non-deformable curved surface, as determined by linear stability analysis. We further found that budding and multi-spindle shapes are induced by Turing patterns, and we also observed the transition from oscillation patterns to stable spot patterns. Our results demonstrate the importance of mechanochemical feedback in pattern formation on deforming membranes.

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