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Related Experiment Videos

Interactions between Rabs, tethers, SNAREs and their regulators in exocytosis.

P Novick1, M Medkova, G Dong

  • 1Department of Cell Biology, Yale University School of Medicine, New Haven, CT 06520, USA. peter.novick@yale.edu

Biochemical Society Transactions
|October 21, 2006
PubMed
Summary
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Sec2p

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The yeast exocytic pathway relies on Rab GTPases like Sec4p for vesicle transport.
  • The exocyst complex tethers secretory vesicles to the plasma membrane.
  • Sec2p acts as an exchange factor for Sec4p, regulating vesicle fusion.

Purpose of the Study:

  • To investigate the regulatory mechanism of Sec2p recruitment to secretory vesicles.
  • To elucidate the role of the Sec2p 450-508 amino acid region in exocyst interaction.
  • To understand how tethering and SNARE pathways coordinate in exocytosis.

Main Methods:

  • Site-directed mutagenesis to create Sec2p mutants.
  • Co-immunoprecipitation to study protein interactions.
  • Analysis of protein localization and complex formation in yeast.

Related Experiment Videos

Main Results:

  • The Sec2p region 450-508 negatively regulates binding to the exocyst subunit Sec15p.
  • Mutations in this region cause Sec2p to accumulate with the exocyst in the cytosol.
  • Overexpression of SNARE regulators can bypass exocyst subunit deletions, indicating functional overlap.

Conclusions:

  • The Sec2p 450-508 region is crucial for Sec2p recycling onto new vesicles.
  • Proper regulation of Sec2p-exocyst interaction is essential for efficient exocytosis.
  • SNARE pathway activation can functionally compensate for defects in vesicle tethering.