A concise method for quantitative analysis of interactions between lipids and membrane proteins

Masataka Inada, Masanao Kinoshita, Ayumi Sumino, Shigetoshi Oiki, Nobuaki Matsumori

研究成果: ジャーナルへの寄稿記事

抄録

Although interactions between lipids and membrane proteins (MPs) have been considered crucially important for understanding the functions of lipids, lack of useful and convincing experimental methods has hampered the analysis of the interactions. Here, we developed a surface plasmon resonance (SPR)-based concise method for quantitative analysis of lipid-MP interactions, coating the sensor chip surface with self-assembled monolayer (SAM) with C 6 -chain. To develop this method, we used bacteriorhodopsin (bR) as an MP, and examined its interaction with various types of lipids. The merits of using C 6 -SAM-modified sensor chip are as follows: (1) alkyl-chains of SAM confer a better immobilization of MPs because of the efficient preconcentration due to hydrophobic contacts; (2) SAM provides immobilized MPs with a partial membranous environment, which is important for the stabilization of MPs; and (3) a thinner C 6 -SAM layer (1 nm) compared with MP size forces the MP to bulge outward from the SAM surface, allowing extraneously injected lipids to be accessible to the hydrophobic transmembrane regions. Actually, the amount of bR immobilized on C 6 -SAM is 10 times higher than that on a hydrophilic CM5 sensor chip, and AFM observations confirmed that bR molecules are exposed on the SAM surface. Of the lipids tested, S-TGA-1, a halobacterium-derived glycolipid, had the highest specificity to bR with a nanomolar dissociation constant. This is consistent with the reported co-crystal structure that indicates the formation of several intermolecular hydrogen bonds. Therefore, we not only reproduced the specific lipid-bR recognition, but also succeeded in its quantitative evaluation, demonstrating the validity and utility of this method.

元の言語英語
ページ(範囲)103-112
ページ数10
ジャーナルAnalytica Chimica Acta
1059
DOI
出版物ステータス出版済み - 6 20 2019

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Self assembled monolayers
quantitative analysis
Lipids
Bacteriorhodopsins
Membrane Proteins
lipid
membrane
protein
Chemical analysis
sensor
Sensors
Halobacterium
Immobilized Proteins
Surface Plasmon Resonance
method
Glycolipids
Surface plasmon resonance
crystal structure
Immobilization
immobilization

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

これを引用

A concise method for quantitative analysis of interactions between lipids and membrane proteins. / Inada, Masataka; Kinoshita, Masanao; Sumino, Ayumi; Oiki, Shigetoshi; Matsumori, Nobuaki.

:: Analytica Chimica Acta, 巻 1059, 20.06.2019, p. 103-112.

研究成果: ジャーナルへの寄稿記事

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