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Issue 25, 2015
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Celebrating Soft Matter's 10th anniversary: screening of the calcium-induced spontaneous curvature of lipid membranes

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Abstract

Lipid membranes are key regulators of cellular function. An important step in membrane-related phenomena is the reshaping of the lipid bilayer, often induced by binding of macromolecules. Numerous experimental and simulation efforts have revealed that calcium, a ubiquitous cellular messenger, has a strong impact on the phase behavior, structural properties, and the stability of membranes. Yet, it is still unknown the way calcium and lipid interactions affect their macroscopic mechanical properties. In this work, we studied the interaction of calcium ions with membrane tethers pulled from giant unilamellar vesicles, to quantify the mechanical effect on the membrane. We found that calcium imposes a positive spontaneous curvature on negatively charged membranes, contrary to predictions we made based on the proposed atomic structure. Surprisingly, this effect vanishes in the presence of physiologically relevant concentrations of sodium chloride. Our work implies that calcium may be a trigger for membrane reshaping only at high concentrations, in a process that is robustly screened by sodium ions.

Graphical abstract: Celebrating Soft Matter's 10th anniversary: screening of the calcium-induced spontaneous curvature of lipid membranes

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Publication details

The article was received on 14 Jan 2015, accepted on 11 May 2015 and first published on 11 May 2015


Article type: Paper
DOI: 10.1039/C5SM00104H
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Citation: Soft Matter, 2015,11, 5030-5036

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    Celebrating Soft Matter's 10th anniversary: screening of the calcium-induced spontaneous curvature of lipid membranes

    M. Simunovic, K. Y. C. Lee and P. Bassereau, Soft Matter, 2015, 11, 5030
    DOI: 10.1039/C5SM00104H

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