Driving force for crystallization of anionic lipid membranes revealed by atomistic simulations

Baofu Qiao, M Olvera de la Cruz*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Crystalline vesicles are promising nanomaterials due to their mechanical stability in various environments. To control their fabrication, it is essential to understand the effects of different experimental conditions on crystallization. Here we perform atomistic molecular dynamics simulations of anionic lipid membranes of 1,2-dilauroyl-sn-glycero-3-phosphol-l-serine. In the presence of Na+ monovalent counterions, we access the phase transition from the liquid-like disordered liquid-crystalline phase to the ordered gel phase by lowering the temperature of the system. The phase transition is conclusively evidenced by the scattering structure factor. Quantitative calculations show that the enhancement of the intertail van der Waals interaction (about -6 kBT) plays a dominant role in driving the phase transition rather than the increase in the cohesive interaction (-0.5 kBT) between lipids and counterions. Meanwhile, in the presence of multivalent counterions of Zn2+ or La3+ the gel phase is found throughout the temperature range investigated. Moreover, the van der Waals interaction per hydrocarbon group is ∼20% stronger in the gel phase (∼ -1.8 kBT regardless of the counterions) than in the liquid-crystalline phase (-1.5 kBT).

Original languageEnglish (US)
Pages (from-to)5073-5080
Number of pages8
JournalJournal of Physical Chemistry B
Volume117
Issue number17
DOIs
StatePublished - May 2 2013

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry
  • Materials Chemistry

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