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Related Experiment Videos

Multiple phosphorylation events regulate the subcellular localization of GGA1.

Melissa M McKay1, Richard A Kahn

  • 1Department of Biochemistry, Emory University School of Medicine, 1510 Clifton Rd, Atlanta, GA 30322-3050, USA.

Traffic (Copenhagen, Denmark)
|December 24, 2003
PubMed
Summary

Phosphorylation of Golgi-associated gamma-ear-containing Arf-binding proteins (GGAs) in the GAT domain influences their localization and dissociation rates from vesicles. This suggests a regulatory role for phosphorylation in vesicle trafficking.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • GGAs (Golgi-associated gamma-ear-containing Arf-binding proteins) are essential coat proteins regulating vesicle transport from the trans-Golgi network (TGN).
  • GGAs possess distinct functional domains (VHS, GAT, hinge, GAE) mediating interactions with Arf, cargo, and other proteins for vesicle budding.

Purpose of the Study:

  • To investigate the functional consequences of GGA1 phosphorylation.
  • To identify specific phosphorylation sites within GGA1 and their impact on protein localization and vesicle association.

Main Methods:

  • Tandem mass spectrometry was employed to identify phosphorylation sites in GGA1.
  • Expression of wild-type and mutant HA-GGA1 proteins (mimicking phosphorylation) in mammalian cells.

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  • Colocalization studies using Golgi and TGN markers, and quantitative analysis of vesicle composition.

    • Main Results:

    • Three phosphorylation sites were identified in GGA1: S268 and T270 in the GAT domain, and S480 in the hinge domain.
    • Mutations mimicking phosphorylation at S268 or T270 in the GAT domain altered GGA1 localization, decreasing Golgi/TGN colocalization and increasing cytoplasmic puncta.
    • Vesicle composition remained unchanged in phosphomimetic mutants compared to wild-type GGA1, indicating no significant alteration in cargo binding.

    Conclusions:

    • Phosphorylation of the GGA1 GAT domain regulates coat protein dissociation dynamics.
    • This phosphorylation event likely stabilizes bound coat proteins, controlling the rate of coat protein dissociation during vesicle trafficking.