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Issue 41, 2010
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ATP synthases: cellular nanomotors characterized by LILBID mass spectrometry

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Abstract

Mass spectrometry of membrane protein complexes is still a methodological challenge due to hydrophobic and hydrophilic parts of the species and the fact that all subunits are bound non-covalently together. The present study with the novel laser induced liquid bead ion desorption mass spectrometry (LILBID-MS) reports on the determination of the subunit composition of the F1Fo-ATP synthase from Bacillus pseudofirmus OF4, that of both bovine heart and, for the first time, of human heart mitochondrial F1Fo-ATP synthases. Under selected buffer conditions the mass of the intact F1Fo-ATP synthase of B. pseudofirmus OF4 could be measured, allowing the analysis of complex subunit stoichiometry. The agreement with theoretical masses derived from sequence databases is very good. A comparison of the ATP synthase subunit composition of 5 different ATPases reveals differences in the complexity of eukaryotic and bacterial ATP synthases. However, whereas the overall construction of eukaryotic enzymes is more complex than the bacterial ones, functionally important subunits are conserved among all ATPases.

Graphical abstract: ATP synthases: cellular nanomotors characterized by LILBID mass spectrometry

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Publication details

The article was received on 28 May 2010, accepted on 28 Jul 2010 and first published on 27 Aug 2010


Article type: Paper
DOI: 10.1039/C0CP00733A
Citation: Phys. Chem. Chem. Phys., 2010,12, 13375-13382
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    ATP synthases: cellular nanomotors characterized by LILBID mass spectrometry

    J. Hoffmann, L. Sokolova, L. Preiss, D. B. Hicks, T. A. Krulwich, N. Morgner, I. Wittig, H. Schägger, T. Meier and B. Brutschy, Phys. Chem. Chem. Phys., 2010, 12, 13375
    DOI: 10.1039/C0CP00733A

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