TCDB is operated by the Saier Lab Bioinformatics Group
Transporter Information:
Name: solute carrier family 34 (sodium phosphate), member 2
Symbol: SLC34A2
TC: 2.A.58.1.1
Locations: 4p15.1-p15.3
Aliases: NAPI-3B
GenBank: AF111856
Swiss-Prot: O95436
Accession Number: NM_006424
PubMed (10329428): Feild JA, Zhang L, Brun KA, Brooks DP, Edwards RM. Cloning and functional characterization of a sodium-dependent phosphatetransporter expressed in human lung and small intestine.Biochem Biophys Res Commun. 1999 May 19;258(3):578-82. PMID: 10329428 [PubMed - indexed for MEDLINE]

A cDNA clone with 53% amino acid identity to the human type II sodium-dependent phosphate transporter (NaPi-3) was isolated from human small intestine and lung. Functional characterization in Xenopus laevis oocytes showed this cDNA to encode a sodium-dependent phosphate transporter. The electrogenic response is similar to that found in other type II transporters but an inverse pH dependence was observed. By Northern blot, a 4.2-kb transcript was found to be abundantly expressed in lung and, to a lesser degree, in several other tissues of epithelial origin including small intestine, pancreas, prostate, and kidney. This transcript encompasses a 2.073-kb open reading frame which is most closely related (78% amino acid identity) to the mouse sodium-dependent phosphate transporter IIb isoform. This novel transporter, designated human NaPi-3b (Genbank AF111856), appears to be an isoform of the mammalian renal type II co-transporter family.

PubMed (10610722): Xu H, Bai L, Collins JF, Ghishan FK. Molecular cloning, functional characterization, tissue distribution, andchromosomal localization of a human, small intestinal sodium-phosphate (Na+-Pi)transporter (SLC34A2).Genomics. 1999 Dec 1;62(2):281-4. PMID: 10610722 [PubMed - indexed for MEDLINE]

Phosphate plays a crucial role in cellular metabolism, and its homeostatic regulation in intestinal and renal epithelia is critical. Apically expressed sodium-phosphate (Na(+)-P(i)) transporters play a critical role in this regulation. We have isolated a cDNA (HGMW-approved symbol SLC34A2) encoding a novel human small intestinal Na(+)-P(i) transporter. The cDNA is shown to be 4135 bp in length with an open reading frame that predicts a 689-amino-acid polypeptide. The putative protein has 76% homology to mouse intestinal type II Na(+)-P(i) transporter (Na/Pi-IIb) and lower homologies with renal type II Na(+)-P(i) transporters. Northern blots showed a singular transcript of 5.0 kb in human lung, small intestine, and kidney. Computer analysis suggests a protein with 11 transmembrane domains and several potential posttranslational modification sites. Functional characterization in Xenopus laevis oocytes showed that this cDNA encodes a functional Na(+)-P(i) transporter. Furthermore, the gene encoding this cDNA was mapped to human chromosome 4p15.1-p15.3 by the FISH method.

>sp|O95436|NPT2B_HUMAN Sodium-dependent phosphate transport protein 2B OS=Homo sapiens GN=SLC34A2 PE=1 SV=3