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Related Concept Videos

Delivery Pathways to the Lysosome01:36

Delivery Pathways to the Lysosome

Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
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G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
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In the secretory pathway, vesicles transport proteins from one cellular compartment to another in forward transport to deliver the protein to its correct location. Occasionally, misfolded proteins and incorrect proteins escape their original compartments, and a retrieval pathway is used to return the escaped proteins to their original compartment.
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After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
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Using an α-Bungarotoxin Binding Site Tag to Study GABA A Receptor Membrane Localization and Trafficking
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Published on: March 28, 2014

Autophagic Pathway on GABARAP Involved in GABAA Receptor Trafficking.

Mengqi Zhou1, Wenjing Shi1, Haoran Li2

  • 1Medical School, Kunming University of Science and Technology, The Affiliated Hospital of Kunming University of Science and Technology, The First People's Hospital of Anning, Kunming University of Science and Technology, 727 Jingming South Road, Chenggong District, Kunming, 650500, Yunnan, China.

Neurochemical Research
|June 1, 2026
PubMed
Summary

Gamma-Aminobutyric Acid Receptor-Associated Protein (GABARAP) lipidylation is essential for autophagy and Gamma-Aminobutyric Acid A Receptor (GABAAR) trafficking. This process involves specific proteins and regulates synaptic functions.

Keywords:
AutophagyGABAARSynapse GABARAP

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Published on: February 21, 2019

Area of Science:

  • Cell Biology
  • Neuroscience
  • Molecular Biology

Background:

  • Gamma-Aminobutyric Acid Receptor-Associated Protein (GABARAP) is a key member of the Autophagy-associated protein 8 (Atg8) family.
  • GABARAP plays a critical role in both autophagy and the trafficking of Gamma-Aminobutyric Acid A Receptors (GABAAR).

Purpose of the Study:

  • To elucidate the molecular pathway of GABARAP formation and its role in synaptic function.
  • To understand the regulatory mechanisms involving kinases and protein complexes in GABARAP lipidation.

Main Methods:

  • The study likely involves molecular biology techniques to investigate protein interactions and signaling pathways.
  • Analysis of the regulatory roles of mTORC1 and AMPK on ULK-1 activity.

Main Results:

  • GABARAP formation shares a similar molecular pathway with LC3-II, involving ULK-1, Atg12-Atg5-Atg16L1, and Atg 4.
  • Rapamycin Complex 1 (mTORC1) and AMP-activated protein kinase (AMPK) were identified as inhibitors of ULK-1, thus regulating GABARAP formation.
  • Lipidated GABARAP interacts with synaptic molecules and postsynaptic scaffolding proteins like gephyrin and Ankyrin to regulate GABAAR clustering.

Conclusions:

  • GABARAP is a crucial regulator of both autophagy and synaptic function, particularly GABAAR trafficking and clustering.
  • The intricate molecular pathway controlling GABARAP lipidation highlights its importance in neuronal signaling and cellular homeostasis.