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SLC51 family of steroid-derived molecule transporters C

Unless otherwise stated all data on this page refer to the human proteins. Gene information is provided for human (Hs), mouse (Mm) and rat (Rn).


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The SLC51 organic solute transporter family of transporters is a pair of heterodimeric proteins which regulate bile salt movements in the small intestine, bile duct, and liver, as part of the enterohepatic circulation [1,3]. OSTα/OSTβ is also expressed in steroidogenic cells of the brain and adrenal gland, where it may contribute to steroid movement [4]. Bile acid transport is suggested to be facilitative and independent of sodium, potassium, chloride ions or protons [1,3]. OSTα/OSTβ heterodimers have been shown to transport [3H]taurocholic acid, [3H]dehydroepiandrosterone sulphate, [3H]estrone-3-sulphate, [3H]pregnenolone sulphate and [3H]dehydroepiandrosterone sulphate [1,3-4]. OSTα/OSTβ-mediated transport of bile salts is inhibited by clofazimine [7]. OSTα is suggested to be a seven TM protein, while OSTβ is a single TM 'ancillary' protein, both of which are thought to have intracellular C-termini [5]. Both proteins function in solute transport and bimolecular fluorescence complementation studies suggest the possibility of OSTα homo-oligomers, as well as OSTα/OSTβ hetero-oligomers [2,5]. An inherited mutation in OSTβ is associated with congenital diarrhea in children [6].


OSTα (Organic solute transporter subunit α / SLC51A1) C Show summary »

OSTβ (Organic solute transporter subunit β / SLC51B) C Show summary »

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NC-IUPHAR subcommittee and family contributors

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How to cite this family page

Database page citation (select format):

Concise Guide to PHARMACOLOGY citation:

Alexander SPH, Kelly E, Mathie A, Peters JA, Veale EL, Armstrong JF, Faccenda E, Harding SD, Pawson AJ, Sharman JL, Southan C, Davies JA; CGTP Collaborators. (2019) The Concise Guide to PHARMACOLOGY 2019/20: Transporters. Br J Pharmacol. 176 Issue S1: S397-S493.