Swing motion as a diffusion mechanism of lipid bilayers in a gel phase.
Phys Rev E
; 93(1): 012409, 2016 Jan.
Article
em En
| MEDLINE
| ID: mdl-26871103
ABSTRACT
Lipid bilayers are a model system for studying the properties of cell membranes. For lipid bilayers of a single lipid component, there is a phase transition from a fluid phase to a gel phase as the temperature is decreased. The dynamic behavior of lipids in the gel phase is interesting some models show dynamic heterogeneity with a large disparity in timescales between fast and slow molecules, and a spatial segregation of the slow molecules. In this paper we study the dynamics of coarse-grained models of lipid bilayers using the dry Martini, Lennard-Jones Martini, polarizable Martini, and BMW models. All four models show similar dynamical behaviors in the gel phase although the transition temperature is model-dependent. We find that the primary mode of transport in the gel phase is a hopping of the lipid molecules. Hopping is seen in both the translational and rotational dynamics, which are correlated, i.e., the lipid molecules display a swing-like motion in the gel phase.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Difusão
/
Bicamadas Lipídicas
/
Modelos Biológicos
/
Movimento (Física)
Idioma:
En
Revista:
Phys Rev E
Ano de publicação:
2016
Tipo de documento:
Article