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Author Spotlight: Advancing Cell Membrane Biophysics - Exploring Interactions and Challenges Through Experimental and Computational Approaches

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Oleic acid phase behavior from molecular dynamics simulations.

J Joel Janke¹, W F Drew Bennett, D Peter Tieleman

¹Department of Biological Sciences and Centre for Molecular Simulation, University of Calgary , 2500 University Drive, Calgary, AB T2N 1N4, Canada.

Langmuir : the ACS Journal of Surfaces and Colloids

|August 19, 2014

Summary

This summary is machine-generated.

Fatty acid aggregation, crucial for life and industry, forms micelles, vesicles, or oil phases based on charge. Simulations reveal complex interactions influencing phase behavior and stability in membranes.

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Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers

Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers

Published on: July 22, 2015

Area of Science:

Biophysics
Computational Chemistry
Origins of Life Research

Background:

Fatty acid aggregation is vital across scientific and industrial fields, yet its molecular mechanisms remain challenging to study experimentally.
Oleic acid phase behavior is experimentally observed but lacks detailed molecular understanding.

Purpose of the Study:

To model oleic acid aggregation using computer simulations and free energy calculations.
To elucidate the molecular drivers of different aggregation states (micelles, vesicles, oil phases) based on protonation.
To investigate monomer stability within various aggregates and lipid bilayers.

Main Methods:

Coarse-grained molecular dynamics simulations.
Free energy calculations using umbrella sampling.
Modeling of oleic acid aggregation based on protonation states.

Main Results:

Simulations reproduce oleic acid aggregation into micelles, vesicles, and oil phases, dependent on head group protonation.
Worm-like micelles form from deprotonated oleic acid; vesicles form from mixed neutral/negative states; oil phases form from neutral states.
Both neutral and charged oleic acid monomers prefer larger aggregates and are most stable within DOPC bilayers.

Conclusions:

The study provides molecular insights into oleic acid aggregation, aligning with experimental observations.
Findings suggest implications for fatty acid adsorption and the evolution of cellular membranes.
Accurate prediction of oleic acid pKa shifts in bilayers necessitates updated polarizable water models.