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Related Concept Videos

SNAREs and Membrane Fusion01:43

SNAREs and Membrane Fusion

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Once a transport vesicle has recognized its target organelle, the vesicular membrane needs to fuse with the target membrane to unload the cargo. Transmembrane proteins called SNAREs present on organelle membranes and their vesicles, mediate vesicle fusion.
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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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Proteins are involved in several cellular processes and biochemical reactions. Analyzing a specific protein of interest requires it to be isolated from the other proteins in the cell. This is achieved by overexpressing the specific gene in a suitable host to produce large quantities of the target protein. A tag or label is recombined with the gene to produce a fusion protein containing the target protein and the tag. The tags on these fusion proteins can then be used for easy detection and...
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Integration of Synaptic Events01:28

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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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The Synapse02:47

The Synapse

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Neurons communicate with one another by passing on their electrical signals to other neurons. A synapse is the location where two neurons meet to exchange signals. At the synapse, the neuron that sends the signal is called the presynaptic cell, while the neuron that receives the message is called the postsynaptic cell. Note that most neurons can be both presynaptic and postsynaptic, as they both transmit and receive information.
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Chemical Synapses

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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
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An Optical Assay for Synaptic Vesicle Recycling in Cultured Neurons Overexpressing Presynaptic Proteins
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Synaptotagmins: That's Why So Many.

Chong Chen1, Peter Jonas1

  • 1IST Austria (Institute of Science and Technology Austria), Am Campus 1, A-3400 Klosterneuburg, Austria.

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|May 19, 2017
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Summary
This summary is machine-generated.

Synaptotagmin 7 (Syt7) acts as a Ca2+ sensor, triggering asynchronous release at the calyx of Held synapse. This function ensures reliable, high-frequency neural transmission in the auditory brainstem.

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Area of Science:

  • Neuroscience
  • Synaptic transmission
  • Calcium signaling

Background:

  • Synaptotagmin 7 (Syt7) was initially characterized as a slow Ca2+ sensor involved in lysosome fusion.
  • The role of Syt7 in fast synaptic transmission, particularly at high-frequency synapses, remained controversial.

Purpose of the Study:

  • To investigate the function of Synaptotagmin 7 (Syt7) at the calyx of Held, a well-established fast synapse.
  • To determine the contribution of Syt7 to synaptic transmission properties during high-frequency stimulation.

Main Methods:

  • Electrophysiological recordings at the calyx of Held synapse.
  • Stimulation protocols to induce high-frequency synaptic transmission.
  • Analysis of neurotransmitter release kinetics and reliability.

Main Results:

  • Synaptotagmin 7 (Syt7) was shown to trigger asynchronous release during stimulus trains at the calyx of Held.
  • Syt7 contributes to reliable and temporally precise high-frequency transmission.
  • A slow Ca2+ sensor (Syt7) plays a crucial role in the fast signaling capabilities of the calyx synapse.

Conclusions:

  • Synaptotagmin 7 (Syt7) is essential for maintaining high-frequency transmission at the calyx of Held synapse.
  • The study resolves the controversy surrounding Syt7 function by demonstrating its role in fast synaptic signaling.
  • Slow Ca2+ sensors can contribute significantly to the rapid and precise communication at auditory synapses.