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Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
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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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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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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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Related Experiment Video

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SNARE zippering and synaptic strength.

Rene C Prashad1, Milton P Charlton1

  • 1Department of Physiology, University of Toronto, Toronto, Ontario, Canada.

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|April 22, 2014
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Summary
This summary is machine-generated.

The zippered state of the trans-Soluble N-ethylmaleimide-sensitive factor Attachment protein REceptor (SNARE) complex does not solely determine neurotransmitter release probability at synapses. Both phasic and tonic synapses share a similar partially zippered SNARE complex structure.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Synaptic transmission relies on neurotransmitter release, with significant variations in release probability across different synapse types.
  • The Soluble N-ethylmaleimide-sensitive factor Attachment protein REceptor (SNARE) complex is crucial for vesicle fusion and neurotransmitter release.
  • The degree of SNARE complex zippering is hypothesized to regulate the initial probability of neurotransmitter release.

Purpose of the Study:

  • To investigate whether the zippered state of the trans-SNARE complex dictates the initial release probability at phasic and tonic synapses.
  • To determine if specific sites on VAMP (vesicle-associated membrane protein) are accessible for cleavage by Clostridial neurotoxins, indicating the extent of SNARE complex zippering.

Main Methods:

  • Presynaptic injection of three Clostridial neurotoxins (BoNT/B-LC, BoNT/D-LC, TeNT-LC) targeting different VAMP cleavage sites.
  • Assessment of evoked neurotransmitter release under low stimulation conditions at phasic and tonic synapses.
  • Analysis of VAMP cleavage to infer the structural state of the trans-SNARE complex.

Main Results:

  • Botulinum B light-chain (BoNT/B-LC) inhibited release and cleaved VAMP at both synapse types, while BoNT/D-LC and tetanus neurotoxin light-chain (TeNT-LC) were ineffective.
  • This selective VAMP susceptibility suggests that SNARE complexes are partially zippered at the N-terminal end (to the zero-layer) with the C-terminal end exposed in the resting state.
  • The presence of this conserved partially zippered state in both high and low release probability synapses challenges the sole role of SNARE zippering in determining release probability.

Conclusions:

  • The zippered state of the trans-SNARE complex, at least to the zero-layer, does not solely determine the wide range of neurotransmitter release probabilities observed.
  • Synapses with vastly different release probabilities (phasic vs. tonic) exhibit a similar partially zippered trans-SNARE complex structure.
  • Further mechanisms beyond the initial SNARE complex zippering must regulate synaptic release probability.