Observations of the distribution of GM3 in membrane microdomains by atomic force microscopy

Kazutoshi Iijima, Norihiro Soga, Teruhiko Matsubara, Toshinori Sato

研究成果: Article査読

16 被引用数 (Scopus)


Glycosphingolipids (GSLs) in membrane microdomains participate in important biological functions. In the present paper, we propose a novel model of the distribution of GSLs in membrane microdomains composed of sphingomyelin (SM) and cholesterol. We investigated the distribution of the ganglioside GM3 in a lipid membrane reconstituted with lipid extract from mouse B16 melanoma cells using an atomic force microscope (AFM). The surface topography of the reconstituted lipid bilayer showed three areas of different heights. The highest area was confirmed to be a GM3 domain by labeling with wheat germ agglutinin. To identify the lipids which are contributed to make the topography, the topographies of the artificial lipid bilayers composed of GM3, SM, 1-palmitoyl-2-oleoyl-phosphatidylcholine, and cholesterol were investigated. AFM images of the artificial lipid bilayers showed that the GM3 domain surrounded by a SM-containing phase only occurred, and its formation was found to depend on the cholesterol content.

ジャーナルJournal of Colloid And Interface Science
出版ステータスPublished - 2009 9月 15

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 生体材料
  • 表面、皮膜および薄膜
  • コロイド化学および表面化学


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