VGAT Protein is a protein encoded by the SLC32A1 gene. This page describes its structure, normal nervous system function, role in neurodegenerative disease, and potential as a therapeutic target.
:: infobox .infobox-protein
VGAT (Vesicular GABA Transporter)
: -
; Gene
: SLC32A1
; UniProt ID
: Q9H1H4
; PDB Structures
: 5VSL, 5VSM
; Molecular Weight
: ~57 kDa (human)
; Subcellular Localization
: Synaptic vesicles of GABAergic and glycinergic neurons
; Protein Family
: Vesicular inhibitory amino acid transporter (VIAAT) family
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VGAT (SLC32A1), also known as VIAAT (Vesicular Inhibitory Amino Acid Transporter), is a 525-amino acid transmembrane protein that packages GABA and glycine into synaptic vesicles. The protein features:
- 10 transmembrane domains: Characteristic of the SLC family
- Vesicular lumen orientation: Transports inhibitory amino acids into vesicles
- Proton gradient coupling: Uses V-ATPase-generated H+ gradient
- Functional homodimer: Forms functional dimers for transport
The transporter couples the proton gradient to GABA/glycine uptake against their concentration gradients.
VGAT is essential for inhibitory neurotransmission:
- GABA packaging: Packages GABA into synaptic vesicles [1]
- Glycine packaging: Also transports glycine in spinal cord and brainstem [1]
- Inhibitory transmission: Critical for fast synaptic inhibition [1]
- Network regulation: Controls excitatory/inhibitory balance [1]
VGAT is expressed in:
- GABAergic cortical interneurons
- Cerebellar Purkinje cells
- Spinal cord glycinergic neurons
- Brainstem inhibitory neurons
VGAT dysfunction is implicated in epilepsy [2]:
- Reduced inhibitory transmission: Diminished GABA release [3]
- Network hyperexcitability: Contributes to seizure generation [2]
- Genetic factors: SLC32A1 mutations cause epilepsy [2]
- Therapeutic targeting: Enhancing VGAT function [3]
- Inhibitory dysfunction: Altered VGAT expression in AD [4]
- Network imbalance: Excitatory/inhibitory ratio affected [4]
- Cognitive decline: Contributes to circuit dysfunction [4]
- Basal ganglia dysfunction: VGAT in striatal interneurons [1]
- Motor control: Altered inhibition affects movement [1]
- Dyskinesias: GABAergic dysfunction in LIDs [1]
- GABAergic loss: Early loss of VGAT-positive neurons [5]
- Striatal degeneration: Contributes to motor symptoms [5]
- Network alterations: Affects cortico-striatal circuits [5]
- GABAergic deficit: Altered VGAT expression in prefrontal cortex [1]
- Cognitive dysfunction: Affects working memory circuits [1]
- VGAT enhancers: Experimental approaches to boost GABA packaging
- Gene therapy: Restoring VGAT expression
- Inhibitory modulation: Restoring excitatory/inhibitory balance
- Combination approaches: With other therapeutic targets
- VGAT-Cre mice: Genetic access to inhibitory neurons
- VGAT-GFP reporters: Visualization of inhibitory neurons