Membrane-MEDYAN: Simulating Deformable Vesicles Containing Complex Cytoskeletal Networks
Membrane-MEDYAN: Simulating Deformable Vesicles Containing Complex Cytoskeletal Networks
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Membrane-MEDYAN：模拟包含复杂细胞骨架网络的可变形囊泡
DOI：
10.1021/acs.jpcb.1c02336
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Papoian, Garegin A.
中科院分区：
文献类型：
--
作者：
Ni, Haoran;Papoian, Garegin A.
质膜决定了细胞的形状，在连接细胞内外环境中起着不可或缺的作用。细胞膜和细胞骨架之间的机械力化学相互作用对于细胞生物力学和机械传感是至关重要的。一个全面捕捉复杂的、细胞尺度的细胞骨架-膜动力学的计算模型仍然缺乏。在这项工作中，我们引入了一个三角化膜模型，该模型解释了膜的弹性性质以及膜-细丝空间相互作用。将相应的力场并入活性生物物质模拟平台Medyan(“活性网络的机械力化学动力学”)。使用新模型的模拟揭示了肌动蛋白细丝捆绑如何影响管膜突起的产生。特别是，我们使用膜-Medyan模拟来研究当改变丝束的几何形状、膜刚性和局部G-肌动蛋白浓度时的突起起始和动力学。我们发现，束的突出倾向敏感地依赖于束厚度和束接近膜的倾角之间的协同作用。新的模型为模拟涉及复杂的膜-细胞骨架相互作用的生物系统铺平了道路，例如发生在前沿和皮质的那些相互作用，最终有助于揭示膜附近活性物质组织的基本原理。
The plasma membrane defines the shape of the cell and plays an indispensable role in bridging intra- and extracellular environments. Mechanochemical interactions between plasma membrane and cytoskeleton are vital for cell biomechanics and mechanosensing. A computational model that comprehensively captures the complex, cell-scale cytoskeleton-membrane dynamics is still lacking. In this work, we introduce a triangulated membrane model that accounts for the membrane’s elastic properties, as well as for membrane–filament steric interactions. The corresponding force-field was incorporated into the active biological matter simulation platform, MEDYAN (“mechanochemical dynamics of active networks”). Simulations using the new model shed light on how actin filament bundling affects generation of tubular membrane protrusions. In particular, we used membrane-MEDYAN simulations to investigate protrusion initiation and dynamics while varying geometries of filament bundles, membrane rigidities and local G-Actin concentrations. We found that the bundles’ protrusion propensities sensitively depend on the synergy between bundle thickness and inclination angle at which the bundle approaches the membrane. The new model paves the way for simulations of biological systems involving intricate membrane–cytoskeleton interactions, such as those occurring at the leading edge and the cortex, eventually helping to uncover the fundamental principles underlying the active matter organization in the vicinity of the membrane.
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影响因子：
19
作者：
Diz-Muñoz A;Fletcher DA;Weiner OD
通讯作者：
Weiner OD
影响因子：
8.6
作者：
Pronk, Sander;Geissler, Phillip L.;Fletcher, Daniel A.
通讯作者：
Fletcher, Daniel A.
影响因子：
3.4
作者：
Atilgan, E;Wirtz, D;Sun, SX
通讯作者：
Sun, SX
影响因子：
4.4
作者：
Floyd, Carlos;Papoian, Garegin A.;Jarzynski, Christopher
通讯作者：
Jarzynski, Christopher
影响因子：
3.4
作者：
Deserno, Markus
通讯作者：
Deserno, Markus