General Information and Variability Data of DT
Gene Name SLC1A5
Protein Name Alanine/serine/cysteine/threonine transporter 2
Synonyms AAAT; ASCT2; ATB(0); ATBO; Baboon M7 virus receptor; M7V1; M7VS1; Neutral amino acid transporter B(0); R16; RD114/simian type D retrovirus receptor; RDR; RDRC; SLC1A5; Sodium-dependent neutral amino acid transporter type 2; Solute carrier family 1 member 5
Gene ID
UniProt ID
DT Family Dicarboxylate/Amino Acid:Cation (Na(+) Or H(+)) Symporter (DAACS) Family ;
Tissue Specificity Placenta, lung, skeletal muscle, kidney,pancreas, and intestine.
Function This sodium-dependent amino acids transporter that has a broad substrate specificity, with a preference for zwitterionic amino acids. It accepts as substrates all neutral amino acids, including glutamine, asparagine, and branched-chain and aromatic amino acids, and excludes methylated, anionic, and cationic amino acids. Through binding of the fusogenic protein syncytin-1/ERVW-1 may mediate trophoblasts syncytialization, the spontaneous fusion of their plasma membranes, an essential process in placental development.
Disease(s) Dietary shortage [ICD-11: 5B7Z]
Nutritional deficiency [ICD-11: 5B7Z]
Herpes simplex virus infection [ICD-11: 1F00]
Shingles [ICD-11: 1.00E+91]
Genetic Polymorphisms & Epigenetic Regulations of DT
Species-, Tissue- and Disease-specific Protein Abundances of DT
Exogenous Factor Altering DT Activity
Approved Drug(s) Transported by This DT Acyclovir Drug Info Shingles [ICD-11: 1.00E+91] Approved [1]
Ganciclovir Drug Info Cytomegalovirus infections [ICD-11: 1D82] Approved [1]
Glycine Drug Info Dietary shortage [ICD-11: 5B7Z] Approved [2]
L-carnitine Drug Info Nutritional deficiency [ICD-11: 5B7Z] Approved [3]
L-glutamine Drug Info Short bowel syndrome [ICD-11: KB89.1] Approved [4]
Valacyclovir Drug Info Shingles [ICD-11: 1.00E+91] Approved [5]
Valganciclovir Drug Info Cytomegalovirus infections [ICD-11: 1D82] Approved [6]
Clinical Trial Drug(s) Transported by This DT D-serine Drug Info Serine deficiency disorder [ICD-11: 5C50.6] Phase 4 [7]
Nitric oxide Drug Info Platelet dysfunction [ICD-11: 3B62] Phase 2/3 [8]
Withdrawn, Discontinued or Preclinical Drug(s) Transported by This DT L-threonine Drug Info Ulcerative colitis [ICD-11: DD71] Preclinical [7]
Endogenous Substrate(s) Thyroid hormones; Thyroid hormone derivatives
Drug-DT Affinity Assessed by Cell Line
Drug(s) with Drug-DT Affinity Data D-serine Drug Info Oocytes-ASCT2 Km = 167 microM [7]
Glycine Drug Info HRPE cells-ASCT2 Km = 320 microM [2]
1 Amino Acid Transporter ATB0,+ as a delivery system for drugs and prodrugs. Curr Drug Targets Immune Endocr Metabol Disord. 2005 Dec;5(4):357-64.
2 Transport of butyryl-L-carnitine, a potential prodrug, via the carnitine transporter OCTN2 and the amino acid transporter ATB(0,+). Am J Physiol Gastrointest Liver Physiol. 2007 Nov;293(5):G1046-53.
3 A polarized localization of amino acid/carnitine transporter B(0,+) (ATB(0,+)) in the blood-brain barrier. Biochem Biophys Res Commun. 2008 Nov 14;376(2):267-70.
4 High-affinity glutamate transporter GLAST/EAAT1 regulates cell surface expression of glutamine/neutral amino acid transporter ASCT2 in human fetal astrocytes. Neurochem Int. 2006 May-Jun;48(6-7):611-5.
5 Transport of amino acid-based prodrugs by the Na+- and Cl(-) -coupled amino acid transporter ATB0,+ and expression of the transporter in tissues amenable for drug delivery. J Pharmacol Exp Ther. 2004 Mar;308(3):1138-47.
6 Transport of amino acid esters and the amino-acid-based prodrug valganciclovir by the amino acid transporter ATB(0,+). Pharm Res. 2004 Jul;21(7):1303-10.
7 D-Serine Is a Substrate for Neutral Amino Acid Transporters ASCT1/SLC1A4 and ASCT2/SLC1A5, and Is Transported by Both Subtypes in Rat Hippocampal Astrocyte Cultures. PLoS One. 2016 Jun 7;11(6):e0156551.
8 Functional regulation of Na+-dependent neutral amino acid transporter ASCT2 by S-nitrosothiols and nitric oxide in Caco-2 cells. FEBS Lett. 2005 Apr 25;579(11):2499-506.

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