TCDB is operated by the Saier Lab Bioinformatics Group
Transporter Information:
Name: solute carrier family 22 (extraneuronal monoamine transporter), member 3
Symbol: SLC22A3
TC: 2.A.1.19.6
Locations: 6q26-q27
Aliases: OCT3, EMT
GenBank: AF078749
Swiss-Prot: O75751
Accession Number: NM_021977
PubMed (9632645): Kekuda R, Prasad PD, Wu X, Wang H, Fei YJ, Leibach FH, Ganapathy V. Cloning and functional characterization of a potential-sensitive, polyspecificorganic cation transporter (OCT3) most abundantly expressed in placenta.J Biol Chem. 1998 Jun 26;273(26):15971-9. PMID: 9632645 [PubMed - indexed for MEDLINE]

We have isolated a cDNA from rat placenta which, when expressed heterologously, mediates the transport of a wide spectrum of organic cations. The cDNA codes for a protein of 551 amino acids containing 12 putative transmembrane domains. Northern blot analysis indicates that this transporter is expressed most abundantly in the placenta and moderately in the intestine, heart, and brain. The expression is comparatively low in the kidney and lung and is undetectable in the liver. This transporter is distinct from the previously cloned organic cation transporters (OCT1, OCT2, NKT, NLT, RST, and OCTN1). When expressed in HeLa cells, the cDNA induces the transport of tetraethylammonium and guanidine. Competition experiments indicate that this transport process recognizes a large number of organic cations, including the neurotoxin 1-methyl-4-phenylpyridinium, as substrates. The cDNA-induced transport is markedly influenced by extracellular pH. However, when expressed in Xenopus laevis oocytes, the cDNA-induced transport is electrogenic, associated with the transfer of positive charge into the oocytes. Under voltage clamp conditions, tetraethylammonium evokes inward currents that are concentration- and potential-dependent. This potential-sensitive organic cation transporter, designated as OCT3, represents a new member of the OCT gene family.

PubMed (9933568): Verhaagh S, Schweifer N, Barlow DP, Zwart R. Cloning of the mouse and human solute carrier 22a3 (Slc22a3/SLC22A3) identifiesa conserved cluster of three organic cation transporters on mouse chromosome 17and human 6q26-q27.Genomics. 1999 Jan 15;55(2):209-18. PMID: 9933568 [PubMed - indexed for MEDLINE]

Here we report the isolation of the mouse and human solute carrier genes Slc22a3/SLC22A3. Slc22a3 is specifically expressed in placenta, but the levels of expression decline toward the end of gestation. A BAC contig spanning the mouse Slc22a3 gene was constructed, and Slc22a3 was mapped between the Igf2r and Plg genes in close association with two additional members of the Slc22a gene family, mouse Slc22a1 and Slc22a2. A partial cDNA sequence of the human SLC22A3 gene was reconstituted from sequenced EST clones. SLC22A3 is expressed in first-trimester and term placenta, but also in skeletal muscle, prostate, aorta, liver, fetal lung, salivary gland, and adrenal gland. Using a somatic cell hybrid panel and a human YAC clone, SLC22A3 was mapped to the syntenic region on human chromosome 6q26-q27, between the IGF2R and APO(a)-like genes. SLC22A1 and SLC22A2 localized to the same locus, demonstrating the conservation of the close physical linkage of these three organic cation transporter genes in mouse and human.

>sp|O75751|S22A3_HUMAN Solute carrier family 22 member 3 OS=Homo sapiens GN=SLC22A3 PE=1 SV=1