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Related Concept Videos

Postsynaptic Potential (PSP)01:32

Postsynaptic Potential (PSP)

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Postsynaptic potential (PSP) refers to a change in the electrical potential of a neuron when neurotransmitters released by presynaptic neurons bind to postsynaptic receptors. This potential can either be excitatory, leading to depolarization and ultimately action potential generation, or inhibitory, leading to hyperpolarization and suppression of the postsynaptic neuron.
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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.
Hebbian LTP
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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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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.
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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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Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
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Related Experiment Video

Updated: Apr 6, 2026

Preparation of Synaptoneurosomes from Mouse Cortex using a Discontinuous Percoll-Sucrose Density Gradient
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The EHD protein Past1 controls postsynaptic membrane elaboration and synaptic function.

Kate Koles1, Emily M Messelaar1, Zachary Feiger1

  • 1Rosenstiel Basic Medical Sciences Research Center, Department of Biology, Brandeis University, Waltham, MA 02453.

Molecular Biology of the Cell
|July 24, 2015
PubMed
Summary

The Past1 protein is essential for shaping muscle membrane structures at the Drosophila neuromuscular junction. Its absence disrupts synaptic function and organization, revealing new roles for EHD proteins in synapse development.

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Related Experiment Videos

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Area of Science:

  • Cell Biology
  • Neuroscience
  • Developmental Biology

Background:

  • Cellular membranes form complex structures vital for specialized functions.
  • Mechanisms governing membrane structure formation are not fully understood.
  • The subsynaptic reticulum (SSR) is a critical membrane structure at the neuromuscular junction.

Purpose of the Study:

  • Investigate the role of the Past1 protein in shaping the subsynaptic reticulum (SSR).
  • Elucidate the function of Eps15 Homology Domain (EHD) proteins in synaptic membrane organization.
  • Understand the molecular mechanisms underlying SSR assembly.

Main Methods:

  • Utilized Drosophila melanogaster larval neuromuscular junction (NMJ) model system.
  • Generated and analyzed past1 mutants to observe morphological and functional changes.
  • Examined the localization and interaction of membrane-remodeling proteins.

Main Results:

  • Past1 is crucial for normal SSR assembly at the Drosophila NMJ.
  • past1 mutants display abnormal NMJ morphology, reduced synaptic transmission, and impaired synaptic homeostasis.
  • Key membrane-remodeling proteins Amphiphysin and Syndapin exhibit altered localization in past1 mutants.

Conclusions:

  • Past1 acts as a key regulator in the assembly of subsynaptic membrane structures.
  • Coordinated action of lipid-binding proteins, including Past1, drives SSR elaboration.
  • EHD proteins play previously unrecognized roles in synaptic membrane organization and function.