OSTalpha

Organic solute transporter alpha, also known as OST-alpha, is a protein which in humans is encoded by the OSTA gene.[4][5]

SLC51A
Identifiers
Aliases	SLC51A, OSTA, OSTalpha, solute carrier family 51 alpha subunit, solute carrier family 51 subunit alpha
External IDs	OMIM: 612084 MGI: 2146634 HomoloGene: 44941 GeneCards: SLC51A
Gene location (Human) Chr. Chromosome 3 (human)[1] Band 3q29 Start 196,211,487 bp[1] End 196,243,178 bp[1]
Gene ontology Molecular function • protein homodimerization activity • protein heterodimerization activity • bile acid transmembrane transporter activity • GO:0022891 transmembrane transporter activity Cellular component • integral component of membrane • cell membrane • endoplasmic reticulum membrane • endoplasmic reticulum • membrane • basolateral plasma membrane • macromolecular complex Biological process • bile acid and bile salt transport • bile acid secretion • transmembrane transport • organic substance transport Sources:Amigo / QuickGO
Orthologs
Species	Human	Mouse
Entrez	200931	106407
Ensembl	ENSG00000163959	n/a
UniProt	Q86UW1	Q8R000
RefSeq (mRNA)	NM_152672	NM_145932
RefSeq (protein)	NP_689885	NP_666044
Location (UCSC)	Chr 3: 196.21 – 196.24 Mb	n/a
PubMed search	[2]	[3]
Wikidata
View/Edit Human View/Edit Mouse

Function

OST-alpha together with OST-beta is able to transport estrone sulfate, taurocholate, digoxin, and prostaglandin E2 across cell membranes.[5][6] The Ost-alpha / Ost-beta heterodimer, but not the individual subunits, stimulates sodium-independent bile acid uptake.[6] The heterodimer furthermore is essential for intestinal bile acid transport.[7]

OST-alpha and OST-alpha have high expression in the testis, colon, liver, small intestine, kidney, ovary, and adrenal gland.[5]

See also

• OSTbeta
• OST Family
• Transporter Classification Database

References

1. GRCh38: Ensembl release 89: ENSG00000163959 - Ensembl, May 2017
2. "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
3. "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
4. "Entrez Gene: OSTalpha organic solute transporter alpha".
5. Seward DJ, Koh AS, Boyer JL, Ballatori N (July 2003). "Functional complementation between a novel mammalian polygenic transport complex and an evolutionarily ancient organic solute transporter, OSTalpha-OSTbeta". J. Biol. Chem. 278 (30): 27473–82. doi:10.1074/jbc.M301106200. PMID 12719432.
6. Dawson PA, Hubbert M, Haywood J, Craddock AL, Zerangue N, Christian WV, Ballatori N (February 2005). "The Heteromeric Organic Solute Transporter α-β, Ostα-Ostβ, Is an Ileal Basolateral Bile Acid Transporter". J. Biol. Chem. 280 (8): 6960–8. doi:10.1074/jbc.M412752200. PMC 1224727. PMID 15563450.
7. Rao A, Haywood J, Craddock AL, Belinsky MG, Kruh GD, Dawson PA (March 2008). "The organic solute transporter α-β, Ostα-Ostβ, is essential for intestinal bile acid transport and homeostasis". Proc. Natl. Acad. Sci. U.S.A. 105 (10): 3891–6. doi:10.1073/pnas.0712328105. PMC 2268840. PMID 18292224.

Further reading

• Strausberg RL, Feingold EA, Grouse LH, et al. (2003). "Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences". Proc. Natl. Acad. Sci. U.S.A. 99 (26): 16899–903. doi:10.1073/pnas.242603899. PMC 139241. PMID 12477932.
• Seward DJ, Koh AS, Boyer JL, Ballatori N (2003). "Functional complementation between a novel mammalian polygenic transport complex and an evolutionarily ancient organic solute transporter, OSTalpha-OSTbeta". J. Biol. Chem. 278 (30): 27473–82. doi:10.1074/jbc.M301106200. PMID 12719432.
• Dawson PA, Hubbert M, Haywood J, et al. (2005). "The Heteromeric Organic Solute Transporter α-β, Ostα-Ostβ, Is an Ileal Basolateral Bile Acid Transporter". J. Biol. Chem. 280 (8): 6960–8. doi:10.1074/jbc.M412752200. PMC 1224727. PMID 15563450.
• Lee H, Zhang Y, Lee FY, et al. (2006). "FXR regulates organic solute transporters alpha and beta in the adrenal gland, kidney, and intestine". J. Lipid Res. 47 (1): 201–14. doi:10.1194/jlr.M500417-JLR200. PMID 16251721.
• Landrier JF, Eloranta JJ, Vavricka SR, Kullak-Ublick GA (2006). "The nuclear receptor for bile acids, FXR, transactivates human organic solute transporter-alpha and -beta genes". Am. J. Physiol. Gastrointest. Liver Physiol. 290 (3): G476–85. doi:10.1152/ajpgi.00430.2005. PMID 16269519.
• Ballatori N, Christian WV, Lee JY, et al. (2005). "OSTalpha-OSTbeta: a major basolateral bile acid and steroid transporter in human intestinal, renal, and biliary epithelia". Hepatology. 42 (6): 1270–9. doi:10.1002/hep.20961. PMID 16317684.
• Boyer JL, Trauner M, Mennone A, et al. (2006). "Upregulation of a basolateral FXR-dependent bile acid efflux transporter OSTalpha-OSTbeta in cholestasis in humans and rodents". Am. J. Physiol. Gastrointest. Liver Physiol. 290 (6): G1124–30. doi:10.1152/ajpgi.00539.2005. PMID 16423920.
• Lim J, Hao T, Shaw C, et al. (2006). "A protein-protein interaction network for human inherited ataxias and disorders of Purkinje cell degeneration". Cell. 125 (4): 801–14. doi:10.1016/j.cell.2006.03.032. PMID 16713569.
• Sun AQ, Balasubramaniyan N, Xu K, et al. (2007). "Protein-protein interactions and membrane localization of the human organic solute transporter". Am. J. Physiol. Gastrointest. Liver Physiol. 292 (6): G1586–93. doi:10.1152/ajpgi.00457.2006. PMID 17332473.