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Synaptic Signaling01:09

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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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When an action potential reaches the presynaptic axon terminal, it releases neurotransmitters from the neuron into the synaptic cleft at a chemical synapse. The released neurotransmitter can be excitatory or inhibitory. The critical criteria commonly used to determine whether a molecule is a neurotransmitter at a chemical synapse are the molecule's presence in the presynaptic neuron. Second, its release is in response to strong presynaptic depolarization. And lastly, the presence of...
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Parasympathetic signaling plays a crucial role in regulating various physiological processes. It involves the release of acetylcholine (ACh) by parasympathetic neurons, which can have localized and short-lived effects. The majority of ACh released is rapidly inactivated at the synapse by the enzyme acetylcholinesterase (AChE), which hydrolyzes Ach into choline and acetate. Additionally, the tissue cholinesterase deactivates any ACh diffusing into the surrounding tissues.
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Structural basis for excitatory neuropeptide signaling.

Valeria Kalienkova1,2, Mowgli Dandamudi3, Cristina Paulino4,5

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Researchers uncovered the structural basis of how neuropeptides activate FMRFamide-gated sodium channel 1 (FaNaC1), a type of ligand-gated ion channel. This study reveals the ligand-binding site and gating mechanisms in degenerin/epithelial sodium channels (DEG/ENaCs).

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Area of Science:

  • Structural Biology
  • Neuroscience
  • Molecular Physiology

Background:

  • Ligand-gated ion channels, including the degenerin/epithelial sodium channel (DEG/ENaC) superfamily, mediate rapid neuronal signaling.
  • The precise mechanisms by which ligands bind to and activate DEG/ENaCs remain largely uncharacterized.
  • DEG/ENaCs exhibit diverse gating stimuli, including neuropeptides, pH, mechanical force, and enzymatic activity.

Purpose of the Study:

  • To elucidate the structural basis of neuropeptide-gated activity in the FMRFamide-gated sodium channel 1 (FaNaC1) from Malacoceros fuliginosus.
  • To understand the ligand-binding site and conformational changes associated with channel gating in DEG/ENaCs.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) was employed to determine the structures of FaNaC1.
  • Structures were obtained for the ligand-free resting state and multiple ligand-bound states.
  • Complementary mutagenesis experiments were performed to validate findings.

Main Results:

  • The study reveals the specific ligand-binding site for neuropeptides on FaNaC1.
  • Cryo-EM structures captured the conformational changes in FaNaC1 upon ligand binding, elucidating the gating mechanism.
  • Mutagenesis experiments confirmed the functional relevance of the observed structural changes.

Conclusions:

  • This research provides the first structural insights into neuropeptide-gated DEG/ENaC activation.
  • The findings illuminate the general principles of channel gating within the DEG/ENaC superfamily.
  • A structural template is offered for future investigations into DEG/ENaC pharmacology and ion conduction.