Investigating the macropinocytic proteome of Dictyostelium amoebae by high-resolution mass spectrometry

Authors

  • Agnès Journet,

    1. CEA, IRTSV, Laboratoire Biologie à Grande Echelle, Grenoble, France
    2. INSERM, Grenoble, France
    3. Université Joseph Fourier, Grenoble, France
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  • Gérard Klein,

    1. CEA, IRTSV, Laboratoire Biologie à Grande Echelle, Grenoble, France
    2. INSERM, Grenoble, France
    3. Université Joseph Fourier, Grenoble, France
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  • Sabine Brugière,

    1. CEA, IRTSV, Laboratoire Biologie à Grande Echelle, Grenoble, France
    2. INSERM, Grenoble, France
    3. Université Joseph Fourier, Grenoble, France
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  • Yves Vandenbrouck,

    1. CEA, IRTSV, Laboratoire Biologie à Grande Echelle, Grenoble, France
    2. INSERM, Grenoble, France
    3. Université Joseph Fourier, Grenoble, France
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  • Agnès Chapel,

    1. CEA, IRTSV, Laboratoire Biologie à Grande Echelle, Grenoble, France
    2. INSERM, Grenoble, France
    3. Université Joseph Fourier, Grenoble, France
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  • Sylvie Kieffer,

    1. CEA, IRTSV, Laboratoire Biologie à Grande Echelle, Grenoble, France
    2. INSERM, Grenoble, France
    3. Université Joseph Fourier, Grenoble, France
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  • Christophe Bruley,

    1. CEA, IRTSV, Laboratoire Biologie à Grande Echelle, Grenoble, France
    2. INSERM, Grenoble, France
    3. Université Joseph Fourier, Grenoble, France
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  • Christophe Masselon,

    1. CEA, IRTSV, Laboratoire Biologie à Grande Echelle, Grenoble, France
    2. INSERM, Grenoble, France
    3. Université Joseph Fourier, Grenoble, France
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  • Laurence Aubry

    Corresponding author
    1. CEA, IRTSV, Laboratoire Biologie à Grande Echelle, Grenoble, France
    2. INSERM, Grenoble, France
    3. Université Joseph Fourier, Grenoble, France
    • BGE/OdyCell, Institut de Recherches en Technologies et Sciences pour le Vivant, CEA-Grenoble, 17 avenue des Martyrs, 38054 Grenoble Cedex 9, France Fax: +33–438-783-065
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Abstract

The cellular slime mold Dictyostelium discoideum is a soil-living eukaryote, which feeds on microorganisms engulfed by phagocytosis. Axenic laboratory strains have been produced that are able to use liquid growth medium internalized by macropinocytosis as the source of food. To better define the macropinocytosis process, we established the inventory of proteins associated with this pathway using mass spectrometry-based proteomics. Using a magnetic purification procedure and high-performance LC-MS/MS proteome analysis, a list of 2108 non-redundant proteins was established, of which 24% featured membrane-spanning domains. Bioinformatics analyses indicated that the most abundant proteins were linked to signaling, vesicular trafficking and the cytoskeleton. The present repertoire validates our purification method and paves the way for a future proteomics approach to study the dynamics of macropinocytosis.

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