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Acidic clusters target transmembrane proteins to the contractile vacuole in Dictyostelium cells

Lefkir, Yaya
Letourneur, François
Published in Journal of Cell Science. 2006, vol. 119, no. Pt 5, p. 837-45
Abstract The mechanisms responsible for the targeting of transmembrane integral proteins to the contractile vacuole (CV) network in Dictyostelium discoideum are unknown. Here we show that the transfer of the cytoplasmic domain of a CV-resident protein (Rh50) to a reporter transmembrane protein (CsA) is sufficient to address the chimera (CsA-Rh50) to the CV. We identified two clusters of acidic residues responsible for this targeting, and these motifs interacted with the gamma-adaptin AP-1 subunit in a yeast protein-protein interaction assay. For the first time we report the existence of an indirect transport pathway from the plasma membrane to the CV via endosomes. Upon internalization, the small fraction of CsA-Rh50 present at the cell surface was first concentrated in endosomes distinct from early and late p80-positive endosomes and then slowly transported to the CV. Together our results suggest the existence of an AP-1-dependent selective transport to the contractile vacuole in Dictyostelium.
Keywords Adaptor Protein Complex gamma Subunits/physiologyAmino Acid SequenceAnimalsCell Adhesion Molecules/genetics/physiologyCell Membrane/physiologyDictyostelium/cytology/enzymology/physiologyEndosomes/physiologyMolecular Sequence DataProtozoan Proteins/genetics/physiologySequence AlignmentSignal Transduction/physiologyVacuoles/physiology
PMID: 16478785
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Research group Phagocytose (140)
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MERCANTI, Valentina et al. Acidic clusters target transmembrane proteins to the contractile vacuole in Dictyostelium cells. In: Journal of Cell Science, 2006, vol. 119, n° Pt 5, p. 837-45. https://archive-ouverte.unige.ch/unige:39520

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Deposited on : 2014-08-19

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