Discrete and heterogeneous rotational dynamics of single membrane probe dyes in gel phase supported lipid bilayer

Benjamin C. Stevens; Taekjip Ha

doi:10.1063/1.1640349

Discrete and heterogeneous rotational dynamics of single membrane probe dyes in gel phase supported lipid bilayer

Benjamin C. Stevens, Taekjip Ha

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

The rotational time trajectories of a membrane probe, diI(3), in supported bilayers of DPPC (1,2-dipalmitoyl-sn-glycero-3-phosphocholine) was measured to probe the local dynamics of of lipid bilayers in the gel phase. The molecular analysis of the rotational time scales showed heterogeneities among molecules. It was suggested that the heterogeneities are not caused by surface interactions and are intrinsic to the gel phase membrane. It was found that the rotational dynamics is temperature dependent and the thermally activated state for the rotational motion has a large entropic barrier.

Original language	English (US)
Pages (from-to)	3030-3039
Number of pages	10
Journal	Journal of Chemical Physics
Volume	120
Issue number	6
DOIs	https://doi.org/10.1063/1.1640349
State	Published - Feb 8 2004
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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10.1063/1.1640349

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abstract = "The rotational time trajectories of a membrane probe, diI(3), in supported bilayers of DPPC (1,2-dipalmitoyl-sn-glycero-3-phosphocholine) was measured to probe the local dynamics of of lipid bilayers in the gel phase. The molecular analysis of the rotational time scales showed heterogeneities among molecules. It was suggested that the heterogeneities are not caused by surface interactions and are intrinsic to the gel phase membrane. It was found that the rotational dynamics is temperature dependent and the thermally activated state for the rotational motion has a large entropic barrier.",

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AB - The rotational time trajectories of a membrane probe, diI(3), in supported bilayers of DPPC (1,2-dipalmitoyl-sn-glycero-3-phosphocholine) was measured to probe the local dynamics of of lipid bilayers in the gel phase. The molecular analysis of the rotational time scales showed heterogeneities among molecules. It was suggested that the heterogeneities are not caused by surface interactions and are intrinsic to the gel phase membrane. It was found that the rotational dynamics is temperature dependent and the thermally activated state for the rotational motion has a large entropic barrier.

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Discrete and heterogeneous rotational dynamics of single membrane probe dyes in gel phase supported lipid bilayer

Abstract

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