Lipid raft proteome reveals ATP synthase complex in the cell surface

Since detergent‐resistant lipid rafts are involved in pathogen invasion, cholesterol homeostasis, angiogenesis, neurodegenerative diseases and signal transduction, protein identification in the rafts could provide important information to study their function. Here, we analyzed detergent‐resistant r...

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Published in:Proteomics (Weinheim) 2004-11, Vol.4 (11), p.3536-3548
Main Authors: Bae, Tae-Jung, Kim, Min-Sik, Kim, Jun-Woo, Kim, Bong-Woo, Choo, Hyo-Jung, Lee, Joong-Won, Kim, Ki-Bum, Lee, Chang Seok, Kim, Ji-Hyun, Chang, Sun Young, Kang, Chang-Yuil, Lee, Sang-Won, Ko, Young-Gyu
Format: Article
Language:English
Subjects:
Amino Acid Sequence
Animals
ATP synthase
Capillary liquid chromatography-tandem mass spectrometry
Cell Membrane - metabolism
Chromatography, Liquid
Cytochromes c
Lipid rafts
Liver - metabolism
Male
Mass Spectrometry
Membrane Microdomains - metabolism
Membrane Proteins
Mitochondria
Mitochondrial Proton-Translocating ATPases - metabolism
Molecular Sequence Data
Proteome - metabolism
Rats
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Summary:Since detergent‐resistant lipid rafts are involved in pathogen invasion, cholesterol homeostasis, angiogenesis, neurodegenerative diseases and signal transduction, protein identification in the rafts could provide important information to study their function. Here, we analyzed detergent‐resistant raft proteins isolated from rat liver by capillary liquid chromatography‐tandem mass spectrometry. Out of 196 proteins identified, 32% belonged to the raft or plasma membrane, 24% to mitochondrial, 20% to microsomal, 7% to miscellaneous, and 17% are unknown proteins. For example, membrane‐bound receptors, trimeric GTP‐binding proteins, ATP‐binding cassette transporters, and glycosylphosphatidylinositol‐anchored proteins were identified in this analysis. Unexpectedly, there were many mitochondrial proteins, raising a new issue for the presence of mitochondrial rafts or the localization of mitochondrial proteins into plasma membrane rafts. We confirmed that ATP synthase α and β were expressed on the surface of the plasma membrane in HepG2 hepatocytes by immunofluorescence, cell surface biotinylation, and cellular fractionation. They had two distinct biochemical properties, detergent insolubility and low density, suggesting that the ATP synthase complex might be located in plasma membrane rafts as well as in the mitochondria.
ISSN:1615-9853
1615-9861
DOI:10.1002/pmic.200400952