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Related Concept Videos

Electrical Synapses01:28

Electrical Synapses

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Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
Gap junctions allow the current to pass directly from one cell to the next. In contrast, in the chemical synapse, the neurotransmitters carry the information through the synaptic cleft from one neuron to the next. They consist of two...
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Assembly of Signaling Complexes01:30

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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
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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 Synapses01:26

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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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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.
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Synaptic Signaling01:09

Synaptic Signaling

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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

Updated: Nov 7, 2025

Preparation of Synaptic Plasma Membrane and Postsynaptic Density Proteins Using a Discontinuous Sucrose Gradient
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Electrical synaptic transmission requires a postsynaptic scaffolding protein.

Abagael M Lasseigne1, Fabio A Echeverry2, Sundas Ijaz2

  • 1Institute of Neuroscience, University of Oregon, Eugene, United States.

Elife
|April 28, 2021
PubMed
Summary

Scaffolding protein ZO1 is essential for electrical synapse function by organizing Connexins. This discovery reveals a critical postsynaptic role for scaffolding in neuronal gap junction assembly and electrical transmission.

Keywords:
connexinsdevelopmental biologyelectrical couplingelectrical synapsegap junctionsneurosciencesynapse formationzebrafishzo1 zo-1

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Synaptic Transmission

Background:

  • Electrical synapses utilize neuronal gap junctions formed by Connexins for rapid communication.
  • Chemical synapses rely on scaffolding proteins for neurotransmitter-gated ion channel support.
  • The role of scaffolding proteins at electrical synapses remains largely unexplored.

Purpose of the Study:

  • To investigate the functional relationship between neuronal Connexins and the scaffolding protein Zonula Occludens 1 (ZO1) at electrical synapses.
  • To determine if ZO1 is required for the localization and function of Connexins in electrical synapses.
  • To elucidate the molecular organization and hierarchical assembly of postsynaptic structures at electrical synapses.

Main Methods:

  • Utilized zebrafish Mauthner cells as a model system for studying electrical synapses.
  • Investigated the localization and functional interdependence of ZO1 and Connexins using advanced imaging and electrophysiological techniques.
  • Disrupted the ZO1/Connexin relationship to assess its impact on synaptic transmission and neuronal function.

Main Results:

  • Zonula Occludens 1 (ZO1) is demonstrated to be crucial for the robust synaptic localization of Connexins.
  • Connexins were found to be dispensable for ZO1 localization, indicating a hierarchical relationship.
  • Disruption of the ZO1-Connexin interaction abolished electrical synaptic transmission and impaired Mauthner cell-mediated escape responses.

Conclusions:

  • A postsynaptic scaffolding protein, ZO1, is essential for assembling functional neuronal gap junctions.
  • This study reveals an unexpected complexity in the molecular organization of electrical synapses, highlighting the critical role of postsynaptic scaffolding.
  • The findings uncover a novel mechanism for regulating electrical synaptic transmission through postsynaptic scaffolding.