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Mol Biol Rep December 1, 2012; 39 (12): 10557-64.
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Molecular cloning and functional characterization of swine sodium dependent phosphate cotransporter type II b (NaPi-IIb) gene.

Zhifeng X , Rejun F , Longchang H , Wenqing S .

A sodium-dependent phosphate transporter gene, NaPi-IIb, was isolated from swine small intestine using cDNA library screening method. Sequencing analysis revealed that the NaPi-IIb cDNA sequences was 2,016 bp in length and encoded an open-reading frame consisting of 671 amino acids. The cDNA showed 83.1 % sequences identity to the human NaPi-IIb and 78.7 % sequences identity to the chicken NaPi-IIb. Prediction of membrane spanning domains based on the hydrophilic and hydrophobic properties of the amino acids suggested that a putative protein had nine transmembrane domains, with both the NH(2) and COOH terminal being intracellular. By northern blot, a ~4.2 kb transcript was found to be abundantly expressed in mall intestine, lung, ovary, mammary glands, liver, kidney, salivary glands, placenta and thymus. Microinjection of swine NaPi-IIb cRNA into Xenopus oocytes demonstrated that the NaPi-IIb showed sodium-dependent Pi cotransport activity, and an approximate 31-fold increase of Pi uptake was seen in cRNA injected oocytes. The swine NaPi-IIb transporter expressed in Xenopus oocytes had a Km for Pi of ~79.35 ± 7.2 μM. Furthermore, the pH dependency characterization of swine NaPi-IIb transporter showed activation at extracellular alkaline-pH.

PubMed ID: 23065201
Article link: Mol Biol Rep

Species referenced: Xenopus
Genes referenced: mall slc34a2

References [+] :
Arima, Molecular cloning of murine sodium-phosphate cotransporter type IIb (Na/P(i)-IIb) gene promoter and characterization of gene structure. 2000, Pubmed