Nanoscale structure of lipid domain boundaries

Matthew Nussio; Rachel Lowe; Nicolas Voelcker; Benjamin Flavel; Christopher Gibson; Matthew Sykes; John Miners; Joseph Shapter

doi:10.1039/b923719d

Nanoscale structure of lipid domain boundaries

Matthew Nussio, Rachel Lowe, Nicolas Voelcker, Benjamin Flavel, Christopher Gibson, Matthew Sykes, John Miners, Joseph Shapter

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

11 Citations (Scopus)

Abstract

Analysis of membrane domain segregation and phase separation is important for the understanding of cell membrane structure and function. In this paper, we report an atomic force microscopy approach using both derivatised tip functionalities and force-volume imaging for the analysis of membrane phase separation. Simultaneous topology and mapping of interaction forces of binary component phospholipid bilayer membranes were performed. Measurements enabled the lateral mapping of bilayer lipid composition at a resolution of 10-20 nm, providing insights into dynamic membrane structure and behaviour. Very sharp boundaries between the two domains are observed in addition to domain boundaries that are quite diffuse with both lipids intermixing. Additionally, some nanoscale domains of one lipid within the domain of the second lipid are observed. The sharp boundaries of the large domains are observed in regions close to these nanodomains.

Original language	English
Pages (from-to)	2193-2199
Number of pages	7
Journal	Soft Matter
Volume	6
Issue number	10
DOIs	https://doi.org/10.1039/b923719d
Publication status	Published - 2010

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AU - Sykes, Matthew

AU - Miners, John

AU - Shapter, Joseph

PY - 2010

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AB - Analysis of membrane domain segregation and phase separation is important for the understanding of cell membrane structure and function. In this paper, we report an atomic force microscopy approach using both derivatised tip functionalities and force-volume imaging for the analysis of membrane phase separation. Simultaneous topology and mapping of interaction forces of binary component phospholipid bilayer membranes were performed. Measurements enabled the lateral mapping of bilayer lipid composition at a resolution of 10-20 nm, providing insights into dynamic membrane structure and behaviour. Very sharp boundaries between the two domains are observed in addition to domain boundaries that are quite diffuse with both lipids intermixing. Additionally, some nanoscale domains of one lipid within the domain of the second lipid are observed. The sharp boundaries of the large domains are observed in regions close to these nanodomains.

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Nanoscale structure of lipid domain boundaries

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