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Emerging new roles of the pre-Golgi intermediate compartment in biosynthetic-secretory trafficking

Jaakko Saraste1, Hege A Dale, Sarah Bazzocco

  • 1Department of Biomedicine and Molecular Imaging Center, University of Bergen, Jonas Lies Vei 91, N-5009 Bergen, Norway. jaakko.saraste@biomed.uib.no

FEBS Letters
|November 6, 2009
PubMed

Insights

The intermediate compartment (IC) acts as a distinct organelle, functioning as a central sorting station for cellular traffic. This discovery reveals its crucial role in both Golgi-dependent and -independent pathways.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Organelle Biology

Background:

  • The intermediate compartment (IC) is a critical, yet poorly understood, organelle situated between the endoplasmic reticulum (ER) and Golgi apparatus.
  • Its precise structure, function, and relationship with other cellular pathways remain areas of active investigation.

Purpose of the Study:

  • To elucidate the structural organization and functional significance of the intermediate compartment (IC) in mammalian cells.
  • To investigate the IC's role as a potential sorting station within the secretory pathway.
  • To explore the IC's communication with the endocytic pathway and its biosynthetic functions.

Main Methods:

  • Immunofluorescence microscopy to visualize IC subdomains and their association with the cell center.
  • Analysis of membrane trafficking pathways, including Golgi-dependent and -independent routes.
  • Investigating the role of the IC's tubular subdomain in biosynthetic processes like cholesterol synthesis.

Main Results:

  • The intermediate compartment (IC) is revealed as an autonomous organelle with distinct vacuolar and tubular subdomains.
  • The IC network is anchored at the cell center and interacts with the endocytic pathway via a pericentrosomal membrane system (PCMS).
  • Evidence suggests the IC functions as a crucial sorting hub, influencing both Golgi-dependent and -independent trafficking, with its tubular subdomain potentially involved in cholesterol synthesis.

Conclusions:

  • The intermediate compartment (IC) represents a key sorting station, dividing the secretory pathway.
  • Its integration with the endocytic pathway highlights a complex crosstalk between cellular trafficking systems.
  • The IC's structural and functional plasticity supports its proposed roles in biosynthesis and transport.

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