Abstract
The role of the integral inner membrane subunit e in self-association of F0F1ATP synthase from bovine heart mitochondria was analyzed by in situ limited proteolysis, blue native PAGE/iterative SDS-PAGE, and LC-MS/MS. Selective degradation of subunit e, without disrupting membrane integrity or ATPase capacity, altered the oligomeric distribution of F0F1ATP synthase, by eliminating oligomers and reducing dimers in favor of monomers. The stoichiometry of subunit e was determined by a quantitative MS-based proteomics approach, using synthetic isotope-labelled reference peptides IAQL*EEVK, VYGVGSL*ALYEK, and ELAEAQEDTIL*K to quantify the b, γ and e subunits, respectively. Accuracy of the method was demonstrated by confirming the 1:1 stoichiometry of subunits γ and b. Altogether, the results indicate that the integrity of a unique copy of subunit e is essential for self-association of mammalian F0F1ATP synthase.
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Elena Bisetto and Paola Picotti contributed equally to this work.
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Bisetto, E., Picotti, P., Giorgio, V. et al. Functional and stoichiometric analysis of subunit e in bovine heart mitochondrial F0F1ATP synthase. J Bioenerg Biomembr 40, 257–267 (2008). https://doi.org/10.1007/s10863-008-9183-5
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DOI: https://doi.org/10.1007/s10863-008-9183-5