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Related Experiment Videos

Small GTP-binding protein associated with Golgi cisternae.

B Goud1, A Zahraoui, A Tavitian

  • 1Unité de Génétique Somatique (URA CNRS 361), Institut Pasteur, Paris, France.

Nature
|June 7, 1990
PubMed
Summary

Researchers found that the Rab6 protein is located in the Golgi apparatus, specifically on the medial and trans cisternae. This protein likely plays a role in regulating vesicular transport in eukaryotic cells.

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Area of Science:

  • Cell Biology
  • Molecular Biology

Background:

  • Eukaryotic vesicular traffic, including exocytosis and endocytosis, is regulated by GTP hydrolysis.
  • Studies in yeast Saccharomyces cerevisiae identified Sec4p and Ypt1p as key regulators of the secretory pathway.
  • Mammalian cells possess proteins functionally related to yeast Sec4p and Ypt1p, suggested by GTP-gamma S analogue studies.

Purpose of the Study:

  • To investigate the localization of Rab6p, a mammalian protein homologous to yeast Ypt1p, within mammalian cells.
  • To determine the specific cellular compartments and regions where Rab6p is concentrated.

Main Methods:

  • Immunolabelling techniques were employed to detect Rab6p.
  • Electron microscopy was used to visualize the precise localization of Rab6p within cellular structures.

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Main Results:

  • Rab6p was localized to the Golgi apparatus in various cell types.
  • Immunoelectron microscopy revealed that Rab6p is predominantly concentrated on the medial and trans cisternae of the Golgi.
  • Rab6p distribution was observed across the entire surface of these Golgi cisternae.

Conclusions:

  • Rab6p is a Golgi-associated protein in mammalian cells.
  • The localization of Rab6p suggests its involvement in regulating vesicular transport through the Golgi apparatus.
  • Rab6p represents a potential mammalian counterpart to yeast proteins involved in intracellular transport.