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- EMDB-33675: Cryo-EM structure of human GABA transporter GAT1 bound with tiaga... -
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Basic information
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Title | Cryo-EM structure of human GABA transporter GAT1 bound with tiagabine in NaCl solution in an inward-open state at 3.2 angstrom | |||||||||
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![]() | GABA transporter / GAT1 / Nipecotic acid / Tiagabine / Neurotransmitter / SLC6A1 / TRANSPORT PROTEIN | |||||||||
Function / homology | ![]() gamma-aminobutyric acid reuptake / Reuptake of GABA / gamma-aminobutyric acid:sodium:chloride symporter activity / sodium:chloride symporter activity / gamma-aminobutyric acid transmembrane transporter activity / gamma-aminobutyric acid import / inorganic anion import across plasma membrane / negative regulation of synaptic transmission, GABAergic / positive regulation of gamma-aminobutyric acid secretion / response to sucrose ...gamma-aminobutyric acid reuptake / Reuptake of GABA / gamma-aminobutyric acid:sodium:chloride symporter activity / sodium:chloride symporter activity / gamma-aminobutyric acid transmembrane transporter activity / gamma-aminobutyric acid import / inorganic anion import across plasma membrane / negative regulation of synaptic transmission, GABAergic / positive regulation of gamma-aminobutyric acid secretion / response to sucrose / response to purine-containing compound / Na+/Cl- dependent neurotransmitter transporters / sodium ion import across plasma membrane / amino acid transport / associative learning / transport across blood-brain barrier / : / sodium ion transmembrane transport / GABA-ergic synapse / chloride transmembrane transport / response to cocaine / response to lead ion / synapse organization / response to toxic substance / memory / response to calcium ion / response to estradiol / presynaptic membrane / chemical synaptic transmission / postsynaptic membrane / axon / neuronal cell body / cell surface / identical protein binding / membrane / metal ion binding / plasma membrane Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.2 Å | |||||||||
![]() | Zhu A / Huang J / Kong F / Tan J / Lei J / Yuan Y / Yan C | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Molecular basis for substrate recognition and transport of human GABA transporter GAT1. Authors: Angqi Zhu / Junhao Huang / Fang Kong / Jiaxin Tan / Jianlin Lei / Yafei Yuan / Chuangye Yan / ![]() Abstract: γ-Aminobutyric acid (GABA), an important inhibitory neurotransmitter in the central nervous system, is recycled through specific GABA transporters (GATs). GAT1, which is mainly expressed in the ...γ-Aminobutyric acid (GABA), an important inhibitory neurotransmitter in the central nervous system, is recycled through specific GABA transporters (GATs). GAT1, which is mainly expressed in the presynaptic terminals of axons, is a potential drug target of neurological disorders due to its essential role in GABA transport. Here we report four cryogenic electron microscopy structures of human GAT1, at resolutions of 2.2-3.2 Å. GAT1 in substrate-free form or in complex with the antiepileptic drug tiagabine exhibits an inward-open conformation. In the presence of GABA or nipecotic acid, inward-occluded structures are captured. The GABA-bound structure reveals an interaction network bridged by hydrogen bonds and ion coordination for GABA recognition. The substrate-free structure unwinds the last helical turn of transmembrane helix TM1a to release sodium ions and substrate. Complemented by structure-guided biochemical analyses, our studies reveal detailed mechanism of GABA recognition and transport, and elucidate mode of action of the inhibitors, nipecotic acid and tiagabine. | |||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 28.7 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 16.3 KB 16.3 KB | Display Display | ![]() |
Images | ![]() | 163.8 KB | ||
Filedesc metadata | ![]() | 5.9 KB | ||
Others | ![]() ![]() | 28.3 MB 28.3 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7y7zMC ![]() 7y7vC ![]() 7y7wC ![]() 7y7yC ![]() 33673 C: citing same article ( M: atomic model generated by this map |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Voxel size | X=Y=Z: 1.0825 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Half map: #2
File | emd_33675_half_map_1.map | ||||||||||||
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Density Histograms |
-Half map: #1
File | emd_33675_half_map_2.map | ||||||||||||
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Density Histograms |
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Sample components
-Entire : GAT1
Entire | Name: GAT1 |
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Components |
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-Supramolecule #1: GAT1
Supramolecule | Name: GAT1 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1 |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 110 KDa |
-Macromolecule #1: Sodium- and chloride-dependent GABA transporter 1
Macromolecule | Name: Sodium- and chloride-dependent GABA transporter 1 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 70.895898 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: MATNGSKVAD GQISTEVSEA PVANDKPKTL VVKVQKKAAD LPDRDTWKGR FDFLMSCVGY AIGLGNVWRF PYLCGKNGGG AFLIPYFLT LIFAGVPLFL LECSLGQYTS IGGLGVWKLA PMFKGVGLAA AVLSFWLNIY YIVIISWAIY YLYNSFTTTL P WKQCDNPW ...String: MATNGSKVAD GQISTEVSEA PVANDKPKTL VVKVQKKAAD LPDRDTWKGR FDFLMSCVGY AIGLGNVWRF PYLCGKNGGG AFLIPYFLT LIFAGVPLFL LECSLGQYTS IGGLGVWKLA PMFKGVGLAA AVLSFWLNIY YIVIISWAIY YLYNSFTTTL P WKQCDNPW NTDRCFSNYS MVNTTNMTSA VVEFWERNMH QMTDGLDKPG QIRWPLAITL AIAWILVYFC IWKGVGWTGK VV YFSATYP YIMLIILFFR GVTLPGAKEG ILFYITPNFR KLSDSEVWLD AATQIFFSYG LGLGSLIALG SYNSFHNNVY RDS IIVCCI NSCTSMFAGF VIFSIVGFMA HVTKRSIADV AASGPGLAFL AYPEAVTQLP ISPLWAILFF SMLLMLGIDS QFCT VEGFI TALVDEYPRL LRNRRELFIA AVCIISYLIG LSNITQGGIY VFKLFDYYSA SGMSLLFLVF FECVSISWFY GVNRF YDNI QEMVGSRPCI WWKLCWSFFT PIIVAGVFIF SAVQMTPLTM GNYVFPKWGQ GVGWLMALSS MVLIPGYMAY MFLTLK GSL KQRIQVMVQP SEDIVRPENG PEQPQAGSST SKEAYILESG DEVDASGDYK DHDGDYKDHD IDYKDDDDK UniProtKB: Sodium- and chloride-dependent GABA transporter 1 |
-Macromolecule #2: Tiagabine
Macromolecule | Name: Tiagabine / type: ligand / ID: 2 / Number of copies: 1 / Formula: TGI |
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Molecular weight | Theoretical: 375.548 Da |
Chemical component information | ![]() ChemComp-TGI: |
-Macromolecule #3: 2-acetamido-2-deoxy-beta-D-glucopyranose
Macromolecule | Name: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 3 / Number of copies: 3 / Formula: NAG |
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Molecular weight | Theoretical: 221.208 Da |
Chemical component information | ![]() ChemComp-NAG: |
-Macromolecule #4: CHLORIDE ION
Macromolecule | Name: CHLORIDE ION / type: ligand / ID: 4 / Number of copies: 1 / Formula: CL |
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Molecular weight | Theoretical: 35.453 Da |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 8 mg/mL |
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Buffer | pH: 8 |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K3 (6k x 4k) / Average electron dose: 50.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.4000000000000001 µm / Nominal defocus min: 1.0 µm |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
Startup model | Type of model: NONE |
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Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 310032 |
Initial angle assignment | Type: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC |
Final angle assignment | Type: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC |