A molecular view of melting in anhydrous phospholipidic membranes

M. Doxastakis, V. García Sakai, S. Ohtake, J. K. Maranas, J. J. De Pablo

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

A high-flux backscattering spectrometer and a time-of-flight disk chopper spectrometer are used to probe the molecular mobility of model freeze-dried phospholipid liposomes at a range of temperatures surrounding the main melting transition. Using specific deuteration, quasielastic neutron scattering provides evidence that, in contrast to the hydrocarbon chains, the headgroups of the phospholipid molecules do not exhibit a sharp melting transition. The onset of motion in the tails is located at temperatures far below the calorimetric transition. Long-range motion is achieved through the onset of whole-lipid translation at the melting temperature. Atomistic simulations are performed on a multibilayer model at conditions corresponding to the scattering experiments. The model provides a good description of the dynamics of the system, with predictions of the scattering functions that agree with experimental results. The analysis of both experimental data and results of simulations supports a picture of a gradual melting of the heterogeneous hydrophobic domain, with part of the chains spanning increasingly larger volumes and part of them remaining effectively immobile until the thermodynamic phase transition occurs.

Original languageEnglish (US)
Pages (from-to)147-161
Number of pages15
JournalBiophysical journal
Volume92
Issue number1
DOIs
StatePublished - Jan 2007

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Freezing
Membranes
Temperature
Phospholipids
Molecular Models
Phase Transition
Neutrons
Articular Range of Motion
Hydrocarbons
Thermodynamics
Liposomes
Lipids

All Science Journal Classification (ASJC) codes

  • Biophysics

Cite this

Doxastakis, M. ; García Sakai, V. ; Ohtake, S. ; Maranas, J. K. ; De Pablo, J. J. / A molecular view of melting in anhydrous phospholipidic membranes. In: Biophysical journal. 2007 ; Vol. 92, No. 1. pp. 147-161.
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Doxastakis, M, García Sakai, V, Ohtake, S, Maranas, JK & De Pablo, JJ 2007, 'A molecular view of melting in anhydrous phospholipidic membranes', Biophysical journal, vol. 92, no. 1, pp. 147-161. https://doi.org/10.1529/biophysj.106.089631

A molecular view of melting in anhydrous phospholipidic membranes. / Doxastakis, M.; García Sakai, V.; Ohtake, S.; Maranas, J. K.; De Pablo, J. J.

In: Biophysical journal, Vol. 92, No. 1, 01.2007, p. 147-161.

Research output: Contribution to journalArticle

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