Cited by 243Neuroscience and Neuropharmacology ResearchCellular transport and secretionAmino Acid Enzymes and Metabolism

Demonstration of functional coupling between γ-aminobutyric acid (GABA) synthesis and vesicular GABA transport into synaptic vesicles

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Jin, Hong, Wu, Heng, Osterhaus, Gregory, Wei, Jianning, Davis, Kathleen, Sha, Di, Floor, Eric, Hsu, Che-Chang +2 more·2003·Proceedings of the National Academy of Sciences

Abstract

l -Glutamic acid decarboxylase (GAD) exists as both membrane-associated and soluble forms in the mammalian brain. Here, we propose that there is a functional and structural coupling between the synthesis of γ-aminobutyric acid (GABA) by membrane-associated GAD and its packaging into synaptic vesicles (SVs) by vesicular GABA transporter (VGAT). This notion is supported by the following observations. First, newly synthesized [ 3 H]GABA from [ 3 H] l -glutamate by membrane-associated GAD is taken up preferentially over preexisting GABA by using immunoaffinity-purified GABAergic SVs. Second, the activity of SV-associated GAD and VGAT seems to be coupled because inhibition of GAD also decreases VGAT activity. Third, VGAT and SV-associated Ca 2+ /calmodulin-dependent kinase II have been found to form a protein complex with GAD. A model is also proposed to link the neuronal stimulation to enhanced synthesis and packaging of GABA into SVs.

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Crossref · 10.1073/pnas.0730698100

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  • GAD67 and GAD65 form complexes with vGAT on synaptic vesicles, facilitating coupling from GABA synthesis to vesicular packaging.

    “It should be noted that, in addition to mediating cytosolic GABA synthesis, which influences cellular GABA levels, GAD67 and GAD65 form complexes that directly interact with vGAT on synaptic vesicles, thereby facilitating the coupling from GABA synthesis to vesicular packaging (51,52).”

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Authors
Jin, H., Wu, H., Osterhaus, G., Wei, J., Davis, K., Sha, D., Floor, E., Hsu, C.-C., Kopke, R. D., & Wu, J.-Y.
Affiliations
  • Scripps Research Institute (US)
  • Departments of Molecular Biosciences and Medicinal Chemistry, University of Kansas, Lawrence, KS 66045; Department of Biomedical Science, Florida Atlantic University, Boca Raton, FL 33431; Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037; and Department of Otolaryngology, Naval Medical Center, San Diego, CA 92134-5000
Venue
Proceedings of the National Academy of Sciences
Published
2003-03-12
Volume
100
Issue
7
Pages
4293-4298
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2083327596
Cited by
243
References
33
Citations by year
2026: 4 · 2025: 4 · 2024: 8 · 2023: 5 · 2022: 10 · 2021: 14 · 2020: 5 · 2019: 9 · 2018: 8 · 2017: 7 · 2016: 12 · 2015: 17 · 2014: 10 · 2013: 10 · 2012: 12
FWCI
4.00
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Science Foundation (9723079)
  • Florida Atlantic University
  • Schmidt Family Foundation
  • Universidad del Atlántico
  • National Institutes of Health
  • National Institute of Neurological Disorders and Stroke (NS37851, R01NS037851)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
Keywords
GABA, GABA synthesis, vesicular GABA transporter, synaptic vesicles, glutamic acid decarboxylase, protein complexes, neurostimulation, GABAergic neurotransmission
MeSH terms
Animals, Biological Transport, Brain, gamma-Aminobutyric Acid, Glutamate Decarboxylase, Kinetics, Models, Neurological, Recombinant Fusion Proteins, Synaptic Vesicles, Rats, Sprague-Dawley, Glutamic Acid, Rats

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