Shotgun proteomics for the characterization of subunit composition of mitochondrial complex I

Gabriella Pocsfalvi, Manuela Cuccurullo, Gitta Schlosser, Giuseppina Cacace, Rosa Anna Siciliano, Maria Fiorella Mazzeo, Salvatore Scacco, Tiziana Cocco, Antonio Gnoni, Antonio Malorni, Sergio Papa

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16 Citations (Scopus)

Abstract

Here we propose shotgun proteomics as an alternative method to gel-based bottom-up proteomic platform for the structural characterization of mitochondrial NADH:ubiquinone oxidoreductase (complex I). The approach is based on simultaneous identification of subunits after global digestion of the intact complex. Resulting mixture of tryptic peptides is purified, concentrated, separated and online analyzed using nano-scale reverse-phase nano-ESI-MS/MS in a single information dependent acquisition mode. The usefulness of the method is demonstrated in our work on the well described model system of complex I from bovine heart mitochondria. The shotgun method led to the identification and partial sequence characterization of 42 subunits representing more than 95% coverage of the complex. In particular, almost all nuclear (except MLRQ) and 5 mitochondria DNA encoded subunits (except ND4L and ND6) were identified. Furthermore, it was possible to identify 30 co-purified proteins of the inner mitochondrial membrane structurally not belonging to complex I. The method's efficiency is shown by comparing it to two classical 1 D gel-based strategies. Shotgun proteomics is less laborious, significantly faster and requires less sample material with minimal treatment, facilitating the screening for post-translational modifications and quantitative and qualitative differences of complex I subunits in genetic disorders.

Original languageEnglish
Pages (from-to)1438-1450
Number of pages13
JournalBiochimica et Biophysica Acta - Bioenergetics
Volume1757
Issue number9-10
DOIs
Publication statusPublished - Sep 1 2006

Keywords

  • Bovine heart mitochondria
  • Complex I
  • Mass spectrometry
  • Shotgun proteomics
  • Subunit composition

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Cell Biology

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  • Cite this

    Pocsfalvi, G., Cuccurullo, M., Schlosser, G., Cacace, G., Siciliano, R. A., Mazzeo, M. F., Scacco, S., Cocco, T., Gnoni, A., Malorni, A., & Papa, S. (2006). Shotgun proteomics for the characterization of subunit composition of mitochondrial complex I. Biochimica et Biophysica Acta - Bioenergetics, 1757(9-10), 1438-1450. https://doi.org/10.1016/j.bbabio.2006.05.037