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Assembly of Presynaptic Active Zones

  • Thomas Dresbach
  • Anna Fejtová
  • Eckart D. Gundelfinger

1. Summary

The active zone defines the area of the presynaptic plasma membrane where synaptic vesicles (SV) dock, mature, and fuse with the cell membrane in a regulated manner. The active zone is defined by an electron-dense cytomatrix of specialized proteins, the cytomatrix assembled at the active zone (CAZ). Some of these proteins, e.g., RIMs, Munc13s, ERC/CASTs as well as Bassoon and Piccolo are exclusive components of the CAZ, and are thought to mediate specific functions, including the localization and regulation of the SV cycle. Recently, major progress has been achieved in studying the assembly of the active zone and the underlying cytoskeletal matrix, suggesting it is not assembled ‘brick-by-brick’ as originally assumed. Rather, mounting evidence suggests that active zone components are preassembled within the neuronal soma, presumably at a trans-Golgi compartment, and then transported on distinct precursor vesicles to primordial presynaptic sites where they fuse with the cell membrane. As Piccolo and Bassoon are unique marker proteins of these vesicles they are called Piccolo-Bassoon transport vesicles (PTVs). The present review summarizes evidence for this active zone precursor vesicle hypothesis, which predicts that presynaptic active zones are assembled in a more or less quantal manner.

Keywords

Active Zone Neurotransmitter Release Presynaptic Active Zone Active Zone Protein Precursor Vesicle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • Thomas Dresbach
    • 1
  • Anna Fejtová
    • 2
  • Eckart D. Gundelfinger
    • 2
  1. 1.Institute for Anatomy and Cell BiologyUniversity of HeidelbergHeidelbergGermany
  2. 2.Leibniz Institute for NeurobiologyMagdeburgGermany

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