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Improved method for the analysis of membrane proteins by mass spectrometry. Physiol Genomics 2007 Jun 19;30(1):89-94 PMID: 17341690 PMCID: PMC2814522


Membrane-bound and membrane-associated proteins are difficult to analyze by mass spectrometry, since the association with lipids impedes the isolation and solubilization of the proteins in buffers suitable for mass spectrometry and the efficient generation of positively charged peptide ions by electrospray ionization. Current methods mostly utilize detergents for the isolation of proteins from membranes. In this study, we present an improved detergent-free method for the isolation and mass spectrometric identification of membrane-bound and membrane-associated proteins. We delipidate proteins from the membrane bilayer by chloroform extraction to overcome dissolution and ionization problems during analysis. Comparison of our results to results obtained by direct tryptic digestion of insoluble membrane pellets identifies an increased number of membrane proteins, and a higher quality of the resulting mass spectral data.

Author List

Mirza SP, Halligan BD, Greene AS, Olivier M


Andrew S. Greene PhD Interim Vice Chair, Chief, Professor in the Biomedical Engineering department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Cells, Cultured
Chromatography, Liquid
Endothelial Cells
Membrane Proteins
Reproducibility of Results
Spectrometry, Mass, Electrospray Ionization

View this publication's entry at the Pubmed website PMID: 17341690
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