6caa

Structural highlights

Disease

S4A4_HUMAN Autosomal recessive proximal renal tubular acidosis. The disease is caused by mutations affecting the gene represented in this entry. Loss of interaction with and stimulation by CA4 is the cause of retinitis pigmentosa type 17 (RP17).

Function

S4A4_HUMAN Electrogenic sodium/bicarbonate cotransporter with a Na(+):HCO3(-) stoichiometry varying from 1:2 to 1:3. May regulate bicarbonate influx/efflux at the basolateral membrane of cells and regulate intracellular pH.^{[1] [2] [3] [4] [5] [6] [7]} Isoform 2: May have a higher activity than isoform 1.^[8]

See Also

• Symporter 3D structures

References

1. ↑ Choi I, Romero MF, Khandoudi N, Bril A, Boron WF. Cloning and characterization of a human electrogenic Na+-HCO-3 cotransporter isoform (hhNBC). Am J Physiol. 1999 Mar;276(3 Pt 1):C576-84. PMID:10069984
2. ↑ Sun XC, Bonanno JA. Identification and cloning of the Na/HCO(3-) cotransporter (NBC) in human corneal endothelium. Exp Eye Res. 2003 Sep;77(3):287-95. PMID:12907161
3. ↑ Demirci FY, Chang MH, Mah TS, Romero MF, Gorin MB. Proximal renal tubular acidosis and ocular pathology: a novel missense mutation in the gene (SLC4A4) for sodium bicarbonate cotransporter protein (NBCe1). Mol Vis. 2006 Apr 10;12:324-30. PMID:16636648
4. ↑ Shirakabe K, Priori G, Yamada H, Ando H, Horita S, Fujita T, Fujimoto I, Mizutani A, Seki G, Mikoshiba K. IRBIT, an inositol 1,4,5-trisphosphate receptor-binding protein, specifically binds to and activates pancreas-type Na+/HCO3- cotransporter 1 (pNBC1). Proc Natl Acad Sci U S A. 2006 Jun 20;103(25):9542-7. doi:, 10.1073/pnas.0602250103. Epub 2006 Jun 12. PMID:16769890 doi:http://dx.doi.org/10.1073/pnas.0602250103
5. ↑ Suzuki M, Vaisbich MH, Yamada H, Horita S, Li Y, Sekine T, Moriyama N, Igarashi T, Endo Y, Cardoso TP, de Sa LC, Koch VH, Seki G, Fujita T. Functional analysis of a novel missense NBC1 mutation and of other mutations causing proximal renal tubular acidosis. Pflugers Arch. 2008 Jan;455(4):583-93. doi: 10.1007/s00424-007-0319-y. Epub 2007 , Jul 28. PMID:17661077 doi:http://dx.doi.org/10.1007/s00424-007-0319-y
6. ↑ Burnham CE, Amlal H, Wang Z, Shull GE, Soleimani M. Cloning and functional expression of a human kidney Na+:HCO3- cotransporter. J Biol Chem. 1997 Aug 1;272(31):19111-4. PMID:9235899
7. ↑ Abuladze N, Lee I, Newman D, Hwang J, Boorer K, Pushkin A, Kurtz I. Molecular cloning, chromosomal localization, tissue distribution, and functional expression of the human pancreatic sodium bicarbonate cotransporter. J Biol Chem. 1998 Jul 10;273(28):17689-95. PMID:9651366
8. ↑ Shirakabe K, Priori G, Yamada H, Ando H, Horita S, Fujita T, Fujimoto I, Mizutani A, Seki G, Mikoshiba K. IRBIT, an inositol 1,4,5-trisphosphate receptor-binding protein, specifically binds to and activates pancreas-type Na+/HCO3- cotransporter 1 (pNBC1). Proc Natl Acad Sci U S A. 2006 Jun 20;103(25):9542-7. doi:, 10.1073/pnas.0602250103. Epub 2006 Jun 12. PMID:16769890 doi:http://dx.doi.org/10.1073/pnas.0602250103