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Molecular sorting on a fluctuating membrane

by Damiano Andreghetti, Luca Dall’Asta, Andrea Gamba, Igor Kolokolov, Vladimir Lebedev

Submission summary

Authors (as registered SciPost users):

Damiano Andreghetti

Abstract

Molecular sorting in biological membranes is essential for proper cellular function. It also plays a crucial role in the budding of enveloped viruses from host cells. We recently proposed that this process is driven by phase separation, where the formation and growth of sorting domains depend primarily on short-range intermolecular interactions. In addition to these, Casimir-like forces---arising from entropic effects in fluctuating membranes and acting on longer ranges---may also play a significant role in the molecular distillation process. Here, using a combination of theoretical analysis and numerical simulations, we explore how these forces contribute to sorting, particularly in the biologically relevant regime where short-range intermolecular interactions are weak. Our results show that Casimir-like forces enhance molecular distillation by reducing the critical radius for the formation of new sorting domains and facilitating the capture of molecules within these domains. We identify the relative rigidity of the membrane and supermolecular domains as a key parameter controlling molecular sorting efficiency, offering new insights into the physical principles underlying molecular sorting in biological systems.

Author indications on fulfilling journal expectations

• Provide a novel and synergetic link between different research areas.
• Open a new pathway in an existing or a new research direction, with clear potential for multi-pronged follow-up work
• Detail a groundbreaking theoretical/experimental/computational discovery
• Present a breakthrough on a previously-identified and long-standing research stumbling block