Excitatory amino acid transporter 1

Excitatory amino acid transporter 1 (EAAT1) is a protein that, in humans, is encoded by the SLC1A3 gene.^[5] EAAT1 is also often called the GLutamate ASpartate Transporter 1 (GLAST-1).

SLC1A3
Identifiers
Aliases	SLC1A3, EA6, EAAT1, GLAST, GLAST1, solute carrier family 1 member 3
External IDs	OMIM: 600111; MGI: 99917; HomoloGene: 20882; GeneCards: SLC1A3; OMA:SLC1A3 - orthologs
Gene location (Human) Chr. Chromosome 5 (human)[1] Band 5p13.2 Start 36,596,588 bp[1] End 36,688,334 bp[1]
Gene location (Mouse) Chr. Chromosome 15 (mouse)[2] Band 15 A1|15 3.82 cM Start 8,663,608 bp[2] End 8,740,248 bp[2]
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in ventricular zone dorsal motor nucleus of vagus nerve internal globus pallidus external globus pallidus Region I of hippocampus proper inferior olivary nucleus nucleus accumbens middle temporal gyrus optic nerve amygdala Top expressed in lobe of cerebellum cerebellar vermis lateral septal nucleus paraventricular nucleus of hypothalamus arcuate nucleus globus pallidus dorsomedial hypothalamic nucleus lateral hypothalamus ventromedial nucleus anterior amygdaloid area More reference expression data BioGPS More reference expression data
Gene ontology Molecular function amino acid binding symporter activity glutamate binding L-glutamate transmembrane transporter activity amino acid transmembrane transporter activity high-affinity glutamate transmembrane transporter activity acidic amino acid transmembrane transporter activity glutamate:sodium symporter activity metal ion binding Cellular component integral component of membrane cell projection membrane plasma membrane cell surface soma neuron projection cell periphery integral component of plasma membrane Biological process chemical synaptic transmission gamma-aminobutyric acid biosynthetic process glutamate biosynthetic process neuromuscular process controlling balance response to light stimulus cell morphogenesis involved in neuron differentiation cranial nerve development response to antibiotic ion transport hearing glutamate secretion auditory behavior neurotransmitter uptake response to wounding positive regulation of synaptic transmission glutamate metabolic process L-glutamate import amino acid transport D-aspartate import across plasma membrane potassium ion transmembrane transport L-glutamate import across plasma membrane L-aspartate import across plasma membrane chloride transmembrane transport L-glutamate transmembrane transport Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 6507 20512 Ensembl ENSG00000079215 ENSMUSG00000005360 UniProt P43003 P56564 RefSeq (mRNA) NM_001166695 NM_001166696 NM_001289939 NM_001289940 NM_004172 NM_148938 RefSeq (protein) NP_001160167 NP_001160168 NP_001276868 NP_001276869 NP_004163 NP_683740 Location (UCSC) Chr 5: 36.6 – 36.69 Mb Chr 15: 8.66 – 8.74 Mb PubMed search [3] [4]
Wikidata
View/Edit Human View/Edit Mouse

EAAT1 is predominantly expressed in the plasma membrane, allowing it to remove glutamate from the extracellular space.^[6] It has also been localized in the inner mitochondrial membrane as part of the malate-aspartate shuttle.^[7]

Mechanism

EAAT1 functions in vivo as a homotrimer.^[8] EAAT1 mediates the transport of glutamic and aspartic acid with the cotransport of three Na⁺ and one H⁺ cations and counter transport of one K⁺ cation. This co-transport coupling (or symport) allows the transport of glutamate into cells against a concentration gradient.^[9]

• 
  "Diagram Illustrating the Malate-Aspartate Shuttle Pathway". (Glutamate aspartate transporter labeled at bottom center.)
• 
  Expression of SLC1A3 in the Bergmann glia fibers. Mouse brain at 7th postnatal day, sagittal section; GENSAT database.

Tissue distribution

EAAT1 is expressed throughout the CNS,^[10] and is highly expressed in astrocytes and Bergmann glia in the cerebellum.^[11][12] In the retina, EAAT1 is expressed in Muller cells.^[13] EAAT1 is also expressed in a number of other tissues including cardiac myocytes.^[7]

Clinical significance

It is associated with type 6 episodic ataxia.^[14] EAAT1 expression may also be associated with osteoarthritis.^[15]

Pharmacology

DL-threo-beta-benzyloxyaspartate (TBOA) is an inhibitor of the excitatory amino acid transporters.^[16]

Selective inhibitors for EAAT1 have recently been discovered based on 25 combinations of substitutions at the 4 and 7 positions of 2-amino-5-oxo-5,6,7,8-tetrahydro-4H-chromene-3-carbonitril.^[17]

References

1. GRCh38: Ensembl release 89: ENSG00000079215 – Ensembl, May 2017
2. GRCm38: Ensembl release 89: ENSMUSG00000005360 – Ensembl, May 2017
3. "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
4. "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
5. "Entrez Gene: SLC1A3 solute carrier family 1 (glial high affinity glutamate transporter), member 3".
6. Lehre KP, Levy LM, Ottersen OP, Storm-Mathisen J, Danbolt NC (March 1995). "Differential expression of two glial glutamate transporters in the rat brain: quantitative and immunocytochemical observations". The Journal of Neuroscience. 15 (3 Pt 1): 1835–53. doi:10.1523/JNEUROSCI.15-03-01835.1995. PMC 6578153. PMID 7891138.
7. Ralphe JC, Segar JL, Schutte BC, Scholz TD (July 2004). "Localization and function of the brain excitatory amino acid transporter type 1 in cardiac mitochondria". Journal of Molecular and Cellular Cardiology. 37 (1): 33–41. doi:10.1016/j.yjmcc.2004.04.008. PMID 15242733.
8. Gendreau S, Voswinkel S, Torres-Salazar D, Lang N, Heidtmann H, Detro-Dassen S, Schmalzing G, Hidalgo P, Fahlke C (September 2004). "A trimeric quaternary structure is conserved in bacterial and human glutamate transporters". The Journal of Biological Chemistry. 279 (38): 39505–12. doi:10.1074/jbc.M408038200. PMID 15265858. S2CID 16077315.
9. Kanai Y, Hediger MA (February 2004). "The glutamate/neutral amino acid transporter family SLC1: molecular, physiological and pharmacological aspects". Pflügers Archiv. 447 (5): 469–79. doi:10.1007/s00424-003-1146-4. PMID 14530974. S2CID 21564906.
10. Danbolt NC (September 2001). "Glutamate uptake". Progress in Neurobiology. 65 (1): 1–105. doi:10.1016/S0301-0082(00)00067-8. PMID 11369436. S2CID 27347413.
11. Storck T, Schulte S, Hofmann K, Stoffel W (November 1992). "Structure, expression, and functional analysis of a Na(+)-dependent glutamate/aspartate transporter from rat brain". Proceedings of the National Academy of Sciences of the United States of America. 89 (22): 10955–9. Bibcode:1992PNAS...8910955S. doi:10.1073/pnas.89.22.10955. PMC 50461. PMID 1279699.
12. Rothstein JD, Martin L, Levey AI, Dykes-Hoberg M, Jin L, Wu D, Nash N, Kuncl RW (September 1994). "Localization of neuronal and glial glutamate transporters". Neuron. 13 (3): 713–25. doi:10.1016/0896-6273(94)90038-8. PMID 7917301. S2CID 45299639.
13. Rauen T, Taylor WR, Kuhlbrodt K, Wiessner M (January 1998). "High-affinity glutamate transporters in the rat retina: a major role of the glial glutamate transporter GLAST-1 in transmitter clearance". Cell and Tissue Research. 291 (1): 19–31. doi:10.1007/s004410050976. PMID 9394040. S2CID 6814592.
14. Jen JC, Wan J, Palos TP, Howard BD, Baloh RW (August 2005). "Mutation in the glutamate transporter EAAT1 causes episodic ataxia, hemiplegia, and seizures". Neurology. 65 (4): 529–34. doi:10.1212/01.WNL.0000172638.58172.5a. PMID 16116111. S2CID 22492395.
15. Mason DJ, Brakspear K, Wilson C, Williams R, Kotwal RS (July 2010). "Expression of glutamate receptors and transporters in human subchondral bone in osteoarthritis". Orthopaedic Proceedings. 93-B (SUPP_I). The British Editorial Society of Bone & Joint Surgery: 411. doi:10.1302/0301-620X.93BSUPP_I.0930069b (inactive 2024-09-12).{{cite journal}}: CS1 maint: DOI inactive as of September 2024 (link)
16. Shimamoto K, Lebrun B, Yasuda-Kamatani Y, Sakaitani M, Shigeri Y, Yumoto N, Nakajima T (February 1998). "DL-threo-beta-benzyloxyaspartate, a potent blocker of excitatory amino acid transporters". Molecular Pharmacology. 53 (2): 195–201. doi:10.1124/mol.53.2.195. PMID 9463476.
17. Jensen AA, Erichsen MN, Nielsen CW, Stensbøl TB, Kehler J, Bunch L (February 2009). "Discovery of the first selective inhibitor of excitatory amino acid transporter subtype 1". Journal of Medicinal Chemistry. 52 (4): 912–5. doi:10.1021/jm8013458. PMID 19161278.

Further reading

• Arriza JL, Fairman WA, Wadiche JI, Murdoch GH, Kavanaugh MP, Amara SG (September 1994). "Functional comparisons of three glutamate transporter subtypes cloned from human motor cortex". The Journal of Neuroscience. 14 (9): 5559–69. doi:10.1523/jneurosci.14-09-05559.1994. PMC 6577102. PMID 7521911.
• Nomura N, Nagase T, Miyajima N, Sazuka T, Tanaka A, Sato S, Seki N, Kawarabayasi Y, Ishikawa K, Tabata S (1995). "Prediction of the coding sequences of unidentified human genes. II. The coding sequences of 40 new genes (KIAA0041-KIAA0080) deduced by analysis of cDNA clones from human cell line KG-1". DNA Research. 1 (5): 223–9. doi:10.1093/dnares/1.5.223. PMID 7584044.
• Takai S, Yamada K, Kawakami H, Tanaka K, Nakamura S (1995). "Localization of the gene (SLC1A3) encoding human glutamate transporter (GluT-1) to 5p13 by fluorescence in situ hybridization". Cytogenetics and Cell Genetics. 69 (3–4): 209–10. doi:10.1159/000133965. PMID 7698014.
• Shashidharan P, Huntley GW, Meyer T, Morrison JH, Plaitakis A (October 1994). "Neuron-specific human glutamate transporter: molecular cloning, characterization and expression in human brain". Brain Research. 662 (1–2): 245–50. doi:10.1016/0006-8993(94)90819-2. PMID 7859077. S2CID 35811464.
• Kirschner MA, Arriza JL, Copeland NG, Gilbert DJ, Jenkins NA, Magenis E, Amara SG (August 1994). "The mouse and human excitatory amino acid transporter gene (EAAT1) maps to mouse chromosome 15 and a region of syntenic homology on human chromosome 5". Genomics. 22 (3): 631–3. doi:10.1006/geno.1994.1437. PMID 8001975.
• Kawakami H, Tanaka K, Nakayama T, Inoue K, Nakamura S (February 1994). "Cloning and expression of a human glutamate transporter". Biochemical and Biophysical Research Communications. 199 (1): 171–6. doi:10.1006/bbrc.1994.1210. PMID 8123008.
• Shashidharan P, Plaitakis A (October 1993). "Cloning and characterization of a glutamate transporter cDNA from human cerebellum". Biochimica et Biophysica Acta (BBA) - Gene Structure and Expression. 1216 (1): 161–4. doi:10.1016/0167-4781(93)90057-K. PMID 8218410.
• Andersson B, Wentland MA, Ricafrente JY, Liu W, Gibbs RA (April 1996). "A "double adaptor" method for improved shotgun library construction". Analytical Biochemistry. 236 (1): 107–13. doi:10.1006/abio.1996.0138. PMID 8619474.
• Stoffel W, Sasse J, Düker M, Müller R, Hofmann K, Fink T, Lichter P (May 1996). "Human high affinity, Na(+)-dependent L-glutamate/L-aspartate transporter GLAST-1 (EAAT-1): gene structure and localization to chromosome 5p11-p12". FEBS Letters. 386 (2–3): 189–93. Bibcode:1996FEBSL.386..189S. doi:10.1016/0014-5793(96)00424-3. PMID 8647279. S2CID 890022.
• Yu W, Andersson B, Worley KC, Muzny DM, Ding Y, Liu W, Ricafrente JY, Wentland MA, Lennon G, Gibbs RA (April 1997). "Large-scale concatenation cDNA sequencing". Genome Research. 7 (4): 353–8. doi:10.1101/gr.7.4.353. PMC 139146. PMID 9110174.
• Dunlop J, Lou Z, McIlvain HB (August 1999). "Properties of excitatory amino acid transport in the human U373 astrocytoma cell line". Brain Research. 839 (2): 235–42. doi:10.1016/S0006-8993(99)01714-X. PMID 10519046. S2CID 7021891.
• Koch HP, Kavanaugh MP, Esslinger CS, Zerangue N, Humphrey JM, Amara SG, Chamberlin AR, Bridges RJ (December 1999). "Differentiation of substrate and nonsubstrate inhibitors of the high-affinity, sodium-dependent glutamate transporters". Molecular Pharmacology. 56 (6): 1095–104. doi:10.1124/mol.56.6.1095. PMID 10570036.
• Ye ZC, Rothstein JD, Sontheimer H (December 1999). "Compromised glutamate transport in human glioma cells: reduction-mislocalization of sodium-dependent glutamate transporters and enhanced activity of cystine-glutamate exchange". The Journal of Neuroscience. 19 (24): 10767–77. doi:10.1523/jneurosci.19-24-10767.1999. PMC 6784962. PMID 10594060.
• Szymocha R, Akaoka H, Dutuit M, Malcus C, Didier-Bazes M, Belin MF, Giraudon P (July 2000). "Human T-cell lymphotropic virus type 1-infected T lymphocytes impair catabolism and uptake of glutamate by astrocytes via Tax-1 and tumor necrosis factor alpha". Journal of Virology. 74 (14): 6433–41. doi:10.1128/JVI.74.14.6433-6441.2000. PMC 112151. PMID 10864655.
• Mordrelle A, Jullian E, Costa C, Cormet-Boyaka E, Benamouzig R, Tomé D, Huneau JF (August 2000). "EAAT1 is involved in transport of L-glutamate during differentiation of the Caco-2 cell line". American Journal of Physiology. Gastrointestinal and Liver Physiology. 279 (2): G366-73. doi:10.1152/ajpgi.2000.279.2.G366. PMID 10915646. S2CID 45577626.
• Seal RP, Shigeri Y, Eliasof S, Leighton BH, Amara SG (December 2001). "Sulfhydryl modification of V449C in the glutamate transporter EAAT1 abolishes substrate transport but not the substrate-gated anion conductance". Proceedings of the National Academy of Sciences of the United States of America. 98 (26): 15324–9. Bibcode:2001PNAS...9815324S. doi:10.1073/pnas.011400198. PMC 65028. PMID 11752470.
• Palmada M, Kinne-Saffran E, Centelles JJ, Kinne RK (April 2002). "Benzodiazepines differently modulate EAAT1/GLAST and EAAT2/GLT1 glutamate transporters expressed in CHO cells". Neurochemistry International. 40 (4): 321–6. doi:10.1016/S0197-0186(01)00087-0. PMID 11792462. S2CID 23624873.
• Scott HL, Pow DV, Tannenberg AE, Dodd PR (February 2002). "Aberrant expression of the glutamate transporter excitatory amino acid transporter 1 (EAAT1) in Alzheimer's disease". The Journal of Neuroscience. 22 (3): RC206. doi:10.1523/jneurosci.22-03-j0004.2002. PMC 6758536. PMID 11826152.
• Vallat-Decouvelaere AV, Chrétien F, Gras G, Le Pavec G, Dormont D, Gray F (May 2003). "Expression of excitatory amino acid transporter-1 in brain macrophages and microglia of HIV-infected patients. A neuroprotective role for activated microglia?". Journal of Neuropathology and Experimental Neurology. 62 (5): 475–85. doi:10.1093/jnen/62.5.475. PMID 12769187. S2CID 11183438.

External links

• Glutamate+Aspartate+Transporter+1 at the U.S. National Library of Medicine Medical Subject Headings (MeSH)
• Overview of all the structural information available in the PDB for UniProt: P43003 (Excitatory amino acid transporter 1) at the PDBe-KB.