Surface densities prewet a near-critical membrane

Surface densities prewet a near-critical membrane
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表面密度预润湿近临界膜

DOI:
10.1073/pnas.2103401118
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发表时间:
2021
期刊:
Proceedings of the National Academy of Sciences
影响因子:
--
通讯作者:
Machta, Benjamin B.
Machta, Benjamin B.
中科院分区:
--
文献类型:
--
作者:
Rouches, Mason;Veatch, Sarah L.;Machta, Benjamin B.

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Recent work has highlighted roles for thermodynamic phases in cellular processes. Proteins and nucleic acids can phase separate into three-dimensional liquid droplets in the cytoplasm and nucleus and the plasma membrane of some cells appears tuned close to a two-dimensional liquid-liquid critical point. In some examples, cytoplasmic proteins aggregate as ‘surface densities’ at plasma membrane domains, forming structures such as the post-synaptic density and diverse signaling clusters. We examine the physics of surface densities with a minimal Monte-Carlo model and Landau theory calculations. We relate these surface densities to ‘prewet’phases, where a liquid phase is stabilized at the boundary of a usually gas-phase system. The membrane’s ability to phase-separate distinguishes these systems from classical prewetting, where the surface is typically an immobile solid. Phase-separation in the membrane permits coexistence of up to three surface phases and criticality dramatically expands the parameter regime in which prewetting-like transitions occurs, leading to broad regions of coexisting surface phases when bulk phases are typically unstable. We explore how the physics of surface densities may enable diverse signaling mechanisms
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