Equilibrative nucleoside transporter 1

Solute carrier family 29 (nucleoside transporters), member 1

Identifiers

SLC29A1; ENT1; MGC1465; MGC3778

External IDs

OMIM: 602193 MGI: 1927073 HomoloGene: 37985 GeneCards: SLC29A1 Gene

Gene Ontology
Molecular function	• nucleoside transmembrane transporter activity • protein binding
Cellular component	• membrane fraction • plasma membrane • integral to plasma membrane • basolateral plasma membrane • apical plasma membrane
Biological process	• nucleobase, nucleoside, nucleotide and nucleic acid metabolic process • lactation • nucleoside transport • nucleoside transport • uridine transport • sleep • transmembrane transport • nucleobase, nucleoside and nucleotide metabolic process • regulation of excitatory postsynaptic membrane potential • cellular response to glucose stimulus • cellular response to hypoxia
Sources: Amigo / QuickGO

RNA expression pattern

More reference expression data

Orthologs

Species

Human

Mouse

RefSeq (mRNA)

RefSeq (protein)

Location (UCSC)

Chr 6:
44.19 – 44.2 Mb

Chr 17:
45.72 – 45.74 Mb

PubMed search

[1]

[2]

Equilibrative nucleoside transporter 1 (ENT1) is a protein that in humans is encoded by the SLC29A1 gene.^[1]^[2]

This gene is a member of the equilibrative nucleoside transporter family. The gene encodes a transmembrane glycoprotein that localizes to the plasma and mitochondrial membranes and mediates the cellular uptake of nucleosides from the surrounding medium. The protein is categorized as an equilibrative (as opposed to concentrative) transporter that is sensitive to inhibition by nitrobenzylthioinosine (NBMPR). Nucleoside transporters are required for nucleotide synthesis in cells that lack de novo nucleoside synthesis pathways, and are also necessary for the uptake of cytotoxic nucleosides used for cancer and viral chemotherapies. Multiple alternatively spliced variants, encoding the same protein, have been found for this gene.^[3]

1 Interactive pathway map
2 See also
3 References
4 Further reading

Interactive pathway map

Click on genes, proteins and metabolites below to link to respective Wikipedia articles. ^[4]

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Fluorouracil (5-FU) Activity edit

References

^ Griffiths M, Beaumont N, Yao SY, Sundaram M, Boumah CE, Davies A, Kwong FY, Coe I, Cass CE, Young JD, Baldwin SA (Jan 1997). "Cloning of a human nucleoside transporter implicated in the cellular uptake of adenosine and chemotherapeutic drugs". Nat Med 3 (1): 89–93. doi:10.1038/nm0197-89. PMID 8986748.
^ Coe IR, Griffiths M, Young JD, Baldwin SA, Cass CE (Feb 1998). "Assignment of the human equilibrative nucleoside transporter (hENT1) to 6p21.1-p21.2". Genomics 45 (2): 459–60. doi:10.1006/geno.1997.4928. PMID 9344680.
^ "Entrez Gene: SLC29A1 solute carrier family 29 (nucleoside transporters), member 1". http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=2030.
^ The interactive pathway map can be edited at WikiPathways: "FluoropyrimidineActivity_WP1601". http://www.wikipathways.org/index.php/Pathway:WP1601.

Bonaldo MF, Lennon G, Soares MB (1997). "Normalization and subtraction: two approaches to facilitate gene discovery.". Genome Res. 6 (9): 791–806. doi:10.1101/gr.6.9.791. PMID 8889548.
Griffiths M, Yao SY, Abidi F, et al. (1998). "Molecular cloning and characterization of a nitrobenzylthioinosine-insensitive (ei) equilibrative nucleoside transporter from human placenta.". Biochem. J. 328 ( Pt 3): 739–43. PMID 9396714.
Lum PY, Ngo LY, Bakken AH, Unadkat JD (2000). "Human intestinal es nucleoside transporter: molecular characterization and nucleoside inhibitory profiles.". Cancer Chemother. Pharmacol. 45 (4): 273–8. doi:10.1007/s002800050040. PMID 10755314.
Sundaram M, Yao SY, Ingram JC, et al. (2002). "Topology of a human equilibrative, nitrobenzylthioinosine (NBMPR)-sensitive nucleoside transporter (hENT1) implicated in the cellular uptake of adenosine and anti-cancer drugs.". J. Biol. Chem. 276 (48): 45270–5. doi:10.1074/jbc.M107169200. PMID 11584005.
SenGupta DJ, Lum PY, Lai Y, et al. (2002). "A single glycine mutation in the equilibrative nucleoside transporter gene, hENT1, alters nucleoside transport activity and sensitivity to nitrobenzylthioinosine.". Biochemistry 41 (5): 1512–9. doi:10.1021/bi015833w. PMID 11814344.
Yao SY, Ng AM, Vickers MF, et al. (2002). "Functional and molecular characterization of nucleobase transport by recombinant human and rat equilibrative nucleoside transporters 1 and 2. Chimeric constructs reveal a role for the ENT2 helix 5-6 region in nucleobase translocation.". J. Biol. Chem. 277 (28): 24938–48. doi:10.1074/jbc.M200966200. PMID 12006583.
Galmarini CM, Thomas X, Calvo F, et al. (2002). "Potential mechanisms of resistance to cytarabine in AML patients.". Leuk. Res. 26 (7): 621–9. doi:10.1016/S0145-2126(01)00184-9. PMID 12008078.
Lai Y, Bakken AH, Unadkat JD (2002). "Simultaneous expression of hCNT1-CFP and hENT1-YFP in Madin-Darby canine kidney cells. Localization and vectorial transport studies.". J. Biol. Chem. 277 (40): 37711–7. doi:10.1074/jbc.M204986200. PMID 12097333.
Sankar N, Machado J, Abdulla P, et al. (2002). "Comparative genomic analysis of equilibrative nucleoside transporters suggests conserved protein structure despite limited sequence identity.". Nucleic Acids Res. 30 (20): 4339–50. doi:10.1093/nar/gkf564. PMID 12384580.
Reiman T, Clarke ML, Dabbagh L, et al. (2003). "Differential expression of human equilibrative nucleoside transporter 1 (hENT1) protein in the Reed-Sternberg cells of Hodgkin's disease.". Leuk. Lymphoma 43 (7): 1435–40. doi:10.1080/1042819022386725. PMID 12389626.
Strausberg RL, Feingold EA, Grouse LH, et al. (2003). "Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences.". Proc. Natl. Acad. Sci. U.S.A. 99 (26): 16899–903. doi:10.1073/pnas.242603899. PMC 139241. PMID 12477932. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=139241.
Mangravite LM, Xiao G, Giacomini KM (2003). "Localization of human equilibrative nucleoside transporters, hENT1 and hENT2, in renal epithelial cells.". Am. J. Physiol. Renal Physiol. 284 (5): F902–10. doi:10.1152/ajprenal.00215.2002. PMID 12527552.
Szkotak AJ, Ng AM, Man SF, et al. (2003). "Coupling of CFTR-mediated anion secretion to nucleoside transporters and adenosine homeostasis in Calu-3 cells.". J. Membr. Biol. 192 (3): 169–79. doi:10.1007/s00232-002-1073-x. PMID 12820662.
Lai Y, Tse CM, Unadkat JD (2004). "Mitochondrial expression of the human equilibrative nucleoside transporter 1 (hENT1) results in enhanced mitochondrial toxicity of antiviral drugs.". J. Biol. Chem. 279 (6): 4490–7. doi:10.1074/jbc.M307938200. PMID 14607828.
Lehner B, Semple JI, Brown SE, et al. (2004). "Analysis of a high-throughput yeast two-hybrid system and its use to predict the function of intracellular proteins encoded within the human MHC class III region.". Genomics 83 (1): 153–67. doi:10.1016/S0888-7543(03)00235-0. PMID 14667819.
Ota T, Suzuki Y, Nishikawa T, et al. (2004). "Complete sequencing and characterization of 21,243 full-length human cDNAs.". Nat. Genet. 36 (1): 40–5. doi:10.1038/ng1285. PMID 14702039.
Endres CJ, Sengupta DJ, Unadkat JD (2004). "Mutation of leucine-92 selectively reduces the apparent affinity of inosine, guanosine, NBMPR [S6-(4-nitrobenzyl)-mercaptopurine riboside and dilazep for the human equilibrative nucleoside transporter, hENT1."]. Biochem. J. 380 (Pt 1): 131–7. doi:10.1042/BJ20031880. PMC 1224139. PMID 14759222. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1224139.
Gerhard DS, Wagner L, Feingold EA, et al. (2004). "The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC).". Genome Res. 14 (10B): 2121–7. doi:10.1101/gr.2596504. PMC 528928. PMID 15489334. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=528928.

This article incorporates text from the United States National Library of Medicine, which is in the public domain.

Adenosinergics

Receptor ligands

Agonists	2-(1-Hexynyl)-N-methyladenosine • 2-Cl-IB-MECA • 2'-MeCCPA • 5'-N-ethylcarboxamidoadenosine • ATL-146e • BAY 60–6583 • CCPA • CGS-21680 • CP-532,903 • GR 79236 • LUF-5835 • LUF-5845 • N6-Cyclopentyladenosine • Regadenoson • SDZ WAG 994 • UK-432,097

Antagonists	8-Phenyl-1,3-dipropylxanthine • Acefylline • Aminophylline • Bamifylline • Caffeine • CGS-15943 • 8-Chlorotheophylline • CPX • CVT-6883 • Dimethazan • DPCPX • Fenethylline • Istradefylline • KF-26777 • MRE3008F20 • MRS-1220 • MRS-1334 • MRS-1706 • MRS-1754 • MRS-3777 • Paraxanthine • Pentoxifylline • Preladenant • Propentofylline • PSB-10 • PSB-11 • PSB 36 • PSB-603 • PSB-788 • PSB-1115 • Rolofylline • SCH-442,416 • SCH-58261 • Theobromine • Theophylline • VUF-5574 • ZM-241,385

Reuptake inhibitors

Plasmalemmal

ENT inhibitors	Dilazep • Dipyridamole • Hexobendine • Pentoxifylline • Propentofylline

Vesicular

VNT inhibitors

Membrane proteins, carrier proteins: membrane transport proteins solute carrier (TC 2A)

By group

SLC1–10

(1) high affinity glutamate and neutral amino-acid transporter (SLC1A1, 2, 3, 4, 5, 6, 7)

(2) facilitative GLUT transporter (SLC2A1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)

(3) heavy subunits of heterodimeric amino-acid transporters (SLC3A1, 2)

(4) bicarbonate transporter (SLC4A1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11)

(5) sodium glucose cotransporter (SLC5A1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)

(6) sodium- and chloride- dependent sodium:neurotransmitter symporters (SLC6A1, SLC6A2, SLC6A3, SLC6A4, SLC6A5, SLC6A6, SLC6A7, SLC6A8, SLC6A9, SLC6A10, SLC6A11, SLC6A12, SLC6A13, SLC6A14, SLC6A15, SLC6A16, SLC6A17, SLC6A18, SLC6A19, SLC6A20)

(7) cationic amino-acid transporter/glycoprotein-associated (SLC7A1, SLC7A2, SLC7A3, SLC7A4) glycoprotein-associated/light or catalytic subunits of heterodimeric amino-acid transporters (SLC7A5, SLC7A6, SLC7A7, SLC7A8, SLC7A9, SLC7A10, SLC7A11, SLC7A13, SLC7A14)

(8) Na+/Ca2+ exchanger (SLC8A1, SLC8A2, SLC8A3)

(9) Na+/H+ exchanger (SLC9A1, SLC9A2, SLC9A3, SLC9A4, SLC9A5, SLC9A6, SLC9A7, SLC9A8, SLC9A9, SLC9A10, SLC9A11)

(10) sodium bile salt cotransport (SLC10A1, SLC10A2, SLC10A3, SLC10A4, SLC10A5, SLC10A6, SLC10A7); 10A1 · 10A2 · 10A3 · 10A7

SLC11–20

(11) proton coupled metal ion transporter (SLC11A1, SLC11A2) 11A3

(12) electroneutral cation-Cl cotransporter (SLC12A1, SLC12A1, SLC12A2, SLC12A3, SLC12A4, SLC12A5, SLC12A6, SLC12A7, SLC12A8, SLC12A9)

(13) human Na+-sulfate/carboxylate cotransporter (SLC13A1, SLC13A2, SLC13A3, SLC13A4, SLC13A5)

(14) urea transporter (SLC14A1, SLC14A2)

(15) proton oligopeptide cotransporter (SLC15A1, SLC15A2, SLC15A3, SLC15A4)

(16) monocarboxylate transporter (SLC16A1, SLC16A2, SLC16A3, SLC16A4, SLC16A5, SLC16A6, SLC16A7, SLC16A8, SLC16A9, SLC16A10, SLC16A11, SLC16A12, SLC16A13, SLC16A14)

(17) vesicular glutamate transporter (SLC17A1, SLC17A2, SLC17A3, SLC17A4, SLC17A5, SLC17A6, SLC17A7, SLC17A8, SLC17A9)

(18) vesicular amine transporter (SLC18A1, SLC18A2, SLC18A3)

(19) folate/thiamine transporter (SLC19A1, SLC19A2, SLC19A3)

(20) type III Na+-phosphate cotransporter (SLC20A1, SLC20A2)

SLC21–30

(21) organic anion transporting (SLCO1A2, SLCO1B1, SLCO1B3, SLCO1B4, SLCO1C1) (SLCO2A1, SLCO2B1) (SLCO3A1) (SLCO4A1, SLCO4C1) (SLCO5A1) (SLCO6A1)

(22) organic cation/anion/zwitterion transporter (SLC22A1, SLC22A2, SLC22A3, SLC22A4, SLC22A5, SLC22A6, SLC22A7, SLC22A8, SLC22A9, SLC22A10, SLC22A11, SLC22A12, SLC22A13, SLC22A14, SLC22A15, SLC22A16, SLC22A17, SLC22A18, SLC22A19, SLC22A20)

(23) Na+-dependent ascorbic acid transporter (SLC23A1, SLC23A2, SLC23A3, SLC23A4)

(24) Na+/(Ca2+-K+) exchanger (SLC24A1, SLC24A2, SLC24A3, SLC24A4, SLC24A5, SLC24A6)

(25) mitochondrial carrier (SLC25A1, SLC25A2, SLC25A3, SLC25A4, SLC25A5, SLC25A6, SLC25A7, SLC25A8, SLC25A9, SLC25A10, SLC25A11, SLC25A12, SLC25A13, SLC25A14, SLC25A15, SLC25A16, SLC25A17, SLC25A18, SLC25A19, SLC25A20, SLC25A21, SLC25A22, SLC25A23, SLC25A24, SLC25A25, SLC25A26, SLC25A27, SLC25A28, SLC25A29, SLC25A30, SLC25A31, SLC25A32, SLC25A33, SLC25A34, SLC25A35, SLC25A36, SLC25A37, SLC25A38, SLC25A39, SLC25A40, SLC25A41, SLC25A42, SLC25A43, SLC25A44, SLC25A45, SLC25A46)

(26) multifunctional anion exchanger (SLC26A1, SLC26A2, SLC26A3, SLC26A4, SLC26A5, SLC26A6, SLC26A7, SLC26A8, SLC26A9, SLC26A10, SLC26A11)

(27) fatty acid transport proteins (SLC27A1, SLC27A2, SLC27A3, SLC27A4, SLC27A5, SLC27A6)

(28) Na+-coupled nucleoside transport (SLC28A1, SLC28A2, SLC28A3

(29) facilitative nucleoside transporter (SLC29A1, SLC29A2, SLC29A3, SLC29A4)

(30) zinc efflux (SLC30A1, SLC30A2, SLC30A3, SLC30A4, SLC30A5, SLC30A6, SLC30A7, SLC30A8, SLC30A9, SLC30A10)

SLC31–40

(31) copper transporter (SLC31A1)

(32) vesicular inhibitory amino-acid transporter (SLC32A1)

(33) Acetyl-CoA transporter (SLC33A1)

(34) type II Na+-phosphate cotransporter (SLC34A1, SLC34A2, SLC34A3)

(35) nucleoside-sugar transporter (SLC35A1, SLC35A2, SLC35A3, SLC35A4, SLC35A5) (SLC35B1, SLC35B2, SLC35B3, SLC35B4) (SLC35C1, SLC35C2) (SLC35D1, SLC35D2, SLC35D3) (SLC35E1, SLC35E2, SLC35E3, SLC35E4)

(36) proton-coupled amino-acid transporter (SLC36A1, SLC36A2, SLC36A3, SLC36A4)36A2 ·

(37) sugar-phosphate/phosphate exchanger (SLC37A1, SLC37A2, SLC37A3, SLC37A4)

(38) System A & N, sodium-coupled neutral amino-acid transporter (SLC38A1, SLC38A2, SLC38A3, SLC38A4, SLC38A5, SLC38A6, SLC38A10)

(39) metal ion transporter (SLC39A1, SLC39A2, SLC39A3, SLC39A4, SLC39A5, SLC39A6, SLC39A7, SLC39A8, SLC39A9, SLC39A10, SLC39A11, SLC39A12, SLC39A13, SLC39A14)

(40) basolateral iron transporter (SLC40A1)

SLC41–48

(41) MgtE-like magnesium transporter (SLC41A1, SLC41A2, SLC41A3)

(42) Ammonia transporter (RhAG, RhBG, RhCG)

(43) Na+-independent, system-L like amino-acid transporter (SLC43A1, SLC43A2, SLC43A3)

(44) Choline-like transporter (SLC44A1, SLC44A2, SLC44A3, SLC44A4, SLC44A5)

(45) Putative sugar transporter (SLC45A1, SLC45A2, SLC54A3, SLC45A4)

(46) Folate transporter (SLC46A1, SLC46A2)

(47) multidrug and toxin extrusion (SLC47A1, SLC47A2)

(48) Heme transporter

SLCO1–4

O1A2 · O1B1 · O1B3 · O2B1 · O431 · O4A1

Ion pumps

Symporter, Cotransporter	Na+/K+/2Cl- - Na/Pi3 - Na+/Cl- - Na/glucose - Na+/I- - Cl-/K+ (4, 5)

Antiporter (exchanger)	Na+/H+ - Na+/Ca2+ (Na+/(Ca2+-K+)) - Cl-/HCO3- (Band 3) - Cl-formate exchanger - Cl-oxalate exchanger

see also solute carrier disorders
B memb: cead, trns (1A, 1C, 1F, 2A, 3A1, 3A2-3, 3D), othr

Equilibrative nucleoside transporter 1

Contents

Interactive pathway map

See also

References

Further reading