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Related Concept Videos

Catenins01:23

Catenins

Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the adherens...
Fusion of Secretory Vesicles with the Plasma Membrane01:26

Fusion of Secretory Vesicles with the Plasma Membrane

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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Synaptic Signaling01:09

Synaptic Signaling

Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
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The presynaptic neuron fires an action potential that...
Synaptic Signaling01:12

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Overview of Secretory Vesicles01:33

Overview of Secretory Vesicles

Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
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Chemical Synapses01:26

Chemical Synapses

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Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...

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Vibrodissociation of Neurons from Rodent Brain Slices to Study Synaptic Transmission and Image Presynaptic Terminals
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Scribble interacts with beta-catenin to localize synaptic vesicles to synapses.

Yu Sun1, Mytyl Aiga, Eileen Yoshida

  • 1Department of Cellular and Physiological Sciences and the Brain Research Centre, University of British Columbia, Vancouver, BC, V6T-1Z3, Canada.

Molecular Biology of the Cell
|May 22, 2009
PubMed
Summary

Scribble protein clusters synaptic vesicles at synapses by interacting with the cadherin-beta-catenin complex. Loss of scribble impairs vesicle recycling, impacting presynaptic assembly and plasticity.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Synaptic vesicle dynamics are crucial for presynaptic assembly and plasticity.
  • Cadherin-beta-catenin complexes are known to cluster synaptic vesicles.
  • The role of scribble in synaptic vesicle localization was previously unclear.

Purpose of the Study:

  • To investigate the interaction between scribble and the cadherin-beta-catenin complex.
  • To determine the role of scribble in synaptic vesicle clustering and recycling.
  • To elucidate the molecular mechanisms of presynaptic assembly.

Main Methods:

  • Co-immunoprecipitation to confirm protein interactions.
  • RNA interference (RNAi) to knockdown scribble expression.
  • Analysis of synaptic vesicle distribution and recycling in knockdown cells.
  • Assessment of synapse number and active zone protein localization.

Main Results:

  • Scribble interacts with beta-catenin at synapses.
  • Scribble knockdown leads to diffuse synaptic vesicle distribution and impaired recycling.
  • Synapse number and bassoon distribution remain unaffected by scribble knockdown.
  • Loss of beta-catenin disrupts scribble localization, but not vice versa.

Conclusions:

  • Scribble functions downstream of beta-catenin to cluster synaptic vesicles.
  • Scribble plays a critical role in maintaining synaptic vesicle pools at developing synapses.
  • The scribble-beta-catenin interaction is essential for proper presynaptic function.