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Title
Abstract
Introduction
Methods
Lipid Defect Analysis
Results
Discussion and Concluding Remarks
References
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Biology
Microbiology

Interdigitation of Lipids Induced by Membrane–Active Proteins

Profile image of Sankaran KrishnaswamySankaran Krishnaswamy

2019, The Journal of Membrane Biology

https://doi.org/10.1007/S00232-019-00072-7
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12 pages

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Abstract

The membrane-active protein Nogo-66 is found to induce interdigitation in dimyristoylphosphocholine membranes. Extensive molecular dynamics simulations have been employed to probe the interactions of Nogo-66 with these model membranes. This phase change happens when the temperature is close to the main transition temperature of the membrane (T m) and only in the presence of the protein. No similar interdigitation of the membrane lipids was observed temperatures well above T m in the presence of the protein. In addition, in protein-free simulations, no interdigitation of the membrane lipids was found both at temperatures near or well above T m indicating that the observed effect is caused by the interactions of Nogo-66 with the membrane. Analysis of the simulations suggest protein-membrane interactions, even if transient, alter the lifetimes of lipid head defects and can potentially alter the effective T m and cause interdigitation. This study emphasize the importance of membrane-active proteins and their interactions with membranes leading to phase transitions which would affect other membrane-related processes such as domain formation.

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