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Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
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Analysis of SNARE-mediated Membrane Fusion Using an Enzymatic Cell Fusion Assay
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CAPS and Munc13: CATCHRs that SNARE Vesicles.

Declan J James1, Thomas F J Martin1

  • 1Department of Biochemistry, University of Wisconsin , Madison, WI , USA.

Frontiers in Endocrinology
|December 24, 2013
PubMed
Summary

Calcium-dependent Activator Protein for Secretion (CAPS) and Mammalian Unc-13 (Munc13) proteins prime vesicles for calcium-triggered exocytosis. Their conserved domains resemble multi-subunit tethering complexes, suggesting shared principles in membrane fusion.

Keywords:
CAPS (aka CADPS)Munc13SNAREsmulti-subunit tethering complexespriming factorsvesicle fusion

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Area of Science:

  • Cell biology
  • Neuroscience
  • Molecular biology

Background:

  • Calcium-dependent Activator Protein for Secretion (CAPS) and Mammalian Unc-13 (Munc13) are crucial for vesicle priming in regulated exocytosis.
  • These proteins are essential for Ca(2+)-triggered exocytosis in neurons and neuroendocrine cells.

Purpose of the Study:

  • To review the roles of CAPS and Munc13 proteins in vesicle priming.
  • To explore the similarities between CAPS/Munc13 C-terminal domains and multi-subunit tethering complexes (MTCs).
  • To identify common operating principles among diverse tethering and priming factors.

Main Methods:

  • Literature review of studies on CAPS, Munc13, and MTCs.
  • Comparative analysis of protein domain structures and functions.
  • Analysis of molecular mechanisms in membrane fusion.

Main Results:

  • CAPS and Munc13 proteins share conserved C-terminal domains that facilitate SNARE complex assembly for vesicle priming.
  • These domains exhibit similarities to the helical rod domains found in MTCs.
  • MTCs are involved in coordinating interactions for SNARE complex assembly during constitutive membrane fusion.

Conclusions:

  • CAPS and Munc13 proteins play vital roles in preparing vesicles for Ca(2+)-triggered release.
  • Structural and functional similarities suggest conserved mechanisms between CAPS/Munc13 and MTCs in membrane tethering and fusion.
  • Understanding these common principles can advance knowledge of regulated and constitutive membrane fusion processes.