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Related Concept Videos

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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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γ-aminobutyric acid or GABA, plays a pivotal role as an inhibitory neurotransmitter in the brain. GABA pathway potentiators, also known as GABAergic drugs, are a class of pharmaceutical agents designed to enhance the functioning of the GABAergic system. These medications primarily treat epilepsy, a neurological disorder characterized by recurrent seizures.
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One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme "pump" embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...
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The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
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While it is unclear how molecules move between adjacent Golgi cisternae, it is apparent that the molecules move from cis- cisterna, the entry face, to the trans- cisterna, the exit face. Experiments initially suggested vesicles that bud from one cisterna and fuse with the next cisterna to transport proteins between the cisternae. This vesicular transport model describes the Golgi apparatus as a relatively static structure with a unique enzyme composition in each cisterna. Molecules are...
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Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
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Cryo-EM structure of GABA transporter 1 reveals substrate recognition and transport mechanism.

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Related Experiment Video

Updated: Aug 31, 2025

Inhibitory Synapse Formation in a Co-culture Model Incorporating GABAergic Medium Spiny Neurons and HEK293 Cells Stably Expressing GABAA Receptors
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GABA transport goes structural.

Baruch I Kanner1, Oshrat Dayan-Alon1

  • 1Department of Biochemistry and Molecular Biology, Institute for Medical Research Israel-Canada, Hebrew University, Hadassah Medical School, Jerusalem 91120, Israel.

Trends in Pharmacological Sciences
|August 19, 2022
PubMed
Summary

Researchers documented the structure of γ-aminobutyric acid transporter 1 (GAT1) bound to the antiepileptic drug tiagabine. This GAT1-tiagabine structure aids in discovering new antiepileptic drugs through structure-based docking.

Keywords:
alternating accesscryo-EMneurotransmitter:sodium:symportertwo-step inhibition mechanism

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Area of Science:

  • Neuroscience
  • Structural Biology
  • Pharmacology

Background:

  • γ-aminobutyric acid transporter 1 (GAT1) regulates neurotransmission by clearing GABA from the synaptic cleft.
  • GAT1 is a target for antiepileptic drugs like tiagabine.
  • Understanding GAT1 structure is crucial for developing new therapeutics.

Purpose of the Study:

  • To determine the structure of GAT1 in complex with tiagabine.
  • To provide a structural basis for the mechanism of GAT1 inhibition by tiagabine.
  • To facilitate structure-based drug discovery for novel antiepileptic agents.

Main Methods:

  • X-ray crystallography was used to obtain the GAT1-tiagabine complex structure.
  • Molecular modeling and docking simulations were employed.

Main Results:

  • The study presents the high-resolution crystal structure of GAT1 bound to tiagabine.
  • The structure reveals key interactions between GAT1 and tiagabine, explaining its inhibitory mechanism.
  • This provides a template for understanding substrate and inhibitor binding.

Conclusions:

  • The GAT1-tiagabine structure offers insights into GAT1 function and tiagabine's mechanism of action.
  • This structural information is valuable for the rational design of novel GAT1 inhibitors.
  • The findings pave the way for discovering new antiepileptic drugs targeting GAT1.