TCDB is operated by the Saier Lab Bioinformatics Group
Transporter Information:
Name: solute carrier family 17 (sodium-dependent inorganic phosphate cotransporter), member 7
Symbol: SLC17A7
TC: 2.A.1.14.13
Locations: 19q13
Aliases: BNPI, VGLUT1
GenBank: AB032436
Swiss-Prot: Q9P2U7
Accession Number: NM_020309
PubMed (8632143): Ni B, Du Y, Wu X, DeHoff BS, Rosteck PR Jr, Paul SM. Molecular cloning, expression, and chromosomal localization of a humanbrain-specific Na(+)-dependent inorganic phosphate cotransporter.J Neurochem. 1996 Jun;66(6):2227-38. PMID: 8632143 [PubMed - indexed for MEDLINE]

We describe the molecular cloning of a cDNA encoding a human brain Na(+)-dependent inorganic phosphate (P(i)) cotransporter (hBNPI). The nucleotide and deduced amino acid sequences of hBNPI reveal a protein of 560 amino acids with six to eight putative transmembrane segments. hBNPI shares a high degree of homology with other Na(+)-dependent inorganic P(i) cotransporters, including those found in rat brain and human and rabbit kidney. Expression of hBNPI in COS-1 cells results in Na(+)-dependent P(i) uptake. Northern blot analysis demonstrates that hBNPI mRNA is expressed predominantly in brain and most abundantly in neuron-enriched regions such as the amygdala and hippocampus. Moderate levels of expression are also observed in glia-enriched areas such as the corpus callosum, and low levels are observed in the substantia nigra, subthalamic nuclei, and thalamus. In situ hybridization histochemistry reveals relatively high levels of hBNPI mRNA in pyramidal neurons of the cerebral cortex and hippocampus and in granule neurons of dentate gyrus. The level of hBNPI mRNA is quite low in fetal compared with adult human brain, suggesting developmental regulation of hBNPI gene expression. Southern analyses of nine eukaryotic genomic DNAs probed under stringent conditions with hBNPI cDNA revealed that the hBNPI gene is highly conserved during vertebrate evolution and that each gene is most likely present as a single copy. Using fluorescent in situ hybridization, we localized hBNPI to the long arm of chromosome 19 (19q13) in close proximity to the late-onset familial Alzheimer's disease locus.

PubMed (10820226): Aihara Y, Mashima H, Onda H, Hisano S, Kasuya H, Hori T, Yamada S, Tomura H,Yamada Y, Inoue I, Kojima I, Takeda J. Molecular cloning of a novel brain-type Na(+)-dependent inorganic phosphatecotransporter.J Neurochem. 2000 Jun;74(6):2622-5. PMID: 10820226 [PubMed - indexed for MEDLINE]

We have isolated a human cDNA encoding a protein, designated DNPI, that shows 82% amino acid identity and 92% similarity to the human brain-specific Na(+)-dependent inorganic phosphate (Na(+)/P(i)) cotransporter (BNPI), which is localized exclusively to neuron-rich regions. Expression of DNPI mRNA in Xenopus oocytes resulted in a significant increase in Na(+)-dependent P(i) transport, indicating that DNPI is a novel Na(+)/P(i) cotransporter. Northern blot analysis shows that DNPI mRNA is expressed predominantly in brain, where the highest levels are observed in medulla, substantia nigra, subthalamic nucleus, and thalamus, all of which express BNPI mRNA at low levels. In contrast, DNPI mRNA is expressed at low levels in cerebellum and hippocampus, where BNPI mRNA is expressed at high levels. No hybridizing signal for DNPI mRNA is observed in the glia-rich region of corpus callosum. In other regions examined, both mRNAs are moderately or highly expressed. These results indicate that BNPI and DNPI, which coordinate Na(+)-dependent P(i) transport in the neuron-rich regions of the brain, may form a new class within the Na(+)/P(i) cotransporter family.

>sp|Q9P2U7|VGLU1_HUMAN Vesicular glutamate transporter 1 OS=Homo sapiens GN=SLC17A7 PE=1 SV=1