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Related Concept Videos

Chemical Synapses01:26

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.
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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Chemical Synapses01:26

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.
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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Fusion of Secretory Vesicles with the Plasma Membrane01:26

Fusion of Secretory Vesicles with the Plasma Membrane

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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.
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
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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.
SNAREs exist in pairs that symmetrically interact and catalyze the fusion of the lipid bilayers in vesicle and target organelle. v-SNARE in the vesicle membrane are single polypeptide chains that bind to a complementary t-SNARE, composed of 2...
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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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ATP Synthase: Mechanism01:48

ATP Synthase: Mechanism

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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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Related Experiment Video

Updated: Feb 26, 2026

An Optical Assay for Synaptic Vesicle Recycling in Cultured Neurons Overexpressing Presynaptic Proteins
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Different strokes for different synaptotagmins.

Caitlin Sedwick

    The Journal of General Physiology
    |July 19, 2017
    PubMed
    Summary
    This summary is machine-generated.

    Synaptotagmins 1 and 7 are key proteins that regulate how chromaffin cells release molecules by controlling granule fusion. This study reveals their specific roles in this essential cellular process.

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    Area of Science:

    • Neurobiology
    • Cell Biology
    • Biochemistry

    Background:

    • Chromaffin cells are crucial for the neuroendocrine stress response.
    • Granule fusion is a fundamental process for cellular secretion.

    Purpose of the Study:

    • To investigate the distinct roles of synaptogamin 1 and synaptogamin 7 in chromaffin cell granule fusion.

    Main Methods:

    • Utilized genetic manipulation to alter synaptogamin expression.
    • Employed advanced microscopy techniques to observe granule dynamics.
    • Performed biochemical assays to analyze fusion mechanisms.

    Main Results:

    • Synaptogamin 1 and 7 exhibit differential effects on the rate and efficiency of granule fusion.
    • Identified specific interaction partners of synaptogamins involved in fusion.

    Conclusions:

    • Synaptogamin 1 and 7 are critical regulators of exocytosis in chromaffin cells.
    • Understanding these proteins offers insights into neuroendocrine secretion and related disorders.