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arXiv 2009.08833cond-mat.softphysics.bio-ph
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由密度和曲率驱动的膜上伸长和弯曲蛋白质的有序化理论

A theory of ordering of elongated and curved proteins on membranes driven by density and curvature

Caterina Tozzi, Nikhil Walani, Anabel-Lise Le Roux, Pere Roca-Cusachs, Marino Arroyo

摘要:

细胞膜与无数的曲率活性蛋白相互作用,这些蛋白控制膜形态并负责机械感觉和机械转导。这些蛋白质中的一些,例如那些含有BAR结构域的蛋白质,是弯曲和伸长的,因此可能会采用不同的取向顺序状态,从各向同性到最大化熵,再到由于拥挤或适应底层膜的曲率而导致的扭曲。在这里,延长工作[纳西曼托等。等人,Phys.Rev.E,2017,96,022704],我们开发了平均场密度泛函理论来预测取向顺序并评估弯曲膜上细长和弯曲物体的集合的自由能。该理论依赖于粒子的微观性质,并解释了密度依赖的各向同性到非均匀性转变如何被各向异性曲率修改。我们还研究了各向同性和双相共存。这一理论奠定了理解BAR蛋白和分子顺序的膜重塑之间的相互作用,在[Le Roux et.等,提交,2020年]。

英文摘要:

Cell membranes interact with a myriad of curvature-active proteins that control membrane morphology and are responsible for mechanosensation and mechanotransduction. Some of these proteins, such as those containing BAR domains, are curved and elongated, and hence may adopt different states of orientational order, from isotropic to maximize entropy to nematic as a result of crowding or to adapt to the curvature of the underlying membrane. Here, extending the work of [Nascimento et. al, Phys. Rev. E, 2017, 96, 022704], we develop a mean-field density functional theory to predict the orientational order and evaluate the free-energy of ensembles of elongated and curved objects on curved membranes. This theory depends on the microscopic properties of the particles and explains how a density-dependent isotropic-to-nematic transition is modified by anisotropic curvature. We also examine the coexistence of isotropic and nematic phases. This theory lays the ground to understand the interplay between membrane reshaping by BAR proteins and molecular order, examined in [Le Roux et. al, Submitted, 2020].

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