| Structural highlights
Disease
SO1B1_HUMAN Rotor syndrome. The disease is caused by variants affecting the gene represented in this entry.
Function
SO1B1_HUMAN Mediates the Na(+)-independent uptake of organic anions (PubMed:10358072, PubMed:15159445, PubMed:17412826). Shows broad substrate specificity, can transport both organic anions such as bile acid taurocholate (cholyltaurine) and conjugated steroids (dehydroepiandrosterone 3-sulfate, 17-beta-glucuronosyl estradiol, and estrone 3-sulfate), as well as eicosanoids (prostaglandin E2, thromboxane B2, leukotriene C4, and leukotriene E4), and thyroid hormones (T4/L-thyroxine, and T3/3,3',5'-triiodo-L-thyronine) (PubMed:10358072, PubMed:10601278, PubMed:10873595, PubMed:11159893, PubMed:12196548, PubMed:12568656, PubMed:15159445, PubMed:15970799, PubMed:16627748, PubMed:17412826, PubMed:19129463, PubMed:26979622). Can take up bilirubin glucuronides from plasma into the liver, contributing to the detoxification-enhancing liver-blood shuttling loop (PubMed:22232210). Involved in the clearance of endogenous and exogenous substrates from the liver (PubMed:10358072, PubMed:10601278). Transports coproporphyrin I and III, by-products of heme synthesis, and may be involved in their hepatic disposition (PubMed:26383540). May contribute to regulate the transport of organic compounds in testes across the blood-testis-barrier (Probable). Can transport HMG-CoA reductase inhibitors (also known as statins), such as pravastatin and pitavastatin, a clinically important class of hypolipidemic drugs (PubMed:10601278, PubMed:15159445, PubMed:15970799). May play an important role in plasma and tissue distribution of the structurally diverse chemotherapeutic drug methotrexate (PubMed:23243220). May also transport antihypertension agents, such as the angiotensin-converting enzyme (ACE) inhibitor prodrug enalapril, and the highly selective angiotensin II AT1-receptor antagonist valsartan, in the liver (PubMed:16624871, PubMed:16627748). Shows a pH-sensitive substrate specificity towards prostaglandin E2 and T4 which may be ascribed to the protonation state of the binding site and leads to a stimulation of substrate transport in an acidic microenvironment (PubMed:19129463). Hydrogencarbonate/HCO3(-) acts as the probable counteranion that exchanges for organic anions (PubMed:19129463).[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17]
Publication Abstract from PubMed
Members of the solute carrier organic anion transporting polypeptide (OATPs) family function as transporters for a large variety of amphipathic organic anions including endogenous metabolites and clinical drugs, such as bile salts, steroids, thyroid hormones, statins, antibiotics, antivirals, and anticancer drugs. OATP1B1 plays a vital role in transporting such substances into the liver for hepatic clearance. FDA and EMA recommend conducting in vitro testing of drug-drug interactions (DDIs) involving OATP1B1. However, the structure and working mechanism of OATPs still remains elusive. In this study, we determined cryo-EM structures of human OATP1B1 bound with representative endogenous metabolites (bilirubin and estrone-3-sulfate), a clinical drug (simeprevir), and a fluorescent indicator (2',7'-dichlorofluorescein), in both outward- and inward-open states. These structures reveal major and minor substrate binding pockets and conformational changes during transport. In combination with mutagenesis studies and molecular dynamics simulations, our work comprehensively elucidates the transport mechanism of OATP1B1 and provides the structural basis for DDI predictions involving OATP1B1, which will greatly promote our understanding of OATPs.
Cryo-EM structures of human organic anion transporting polypeptide OATP1B1.,Shan Z, Yang X, Liu H, Yuan Y, Xiao Y, Nan J, Zhang W, Song W, Wang J, Wei F, Zhang Y Cell Res. 2023 Dec;33(12):940-951. doi: 10.1038/s41422-023-00870-8. Epub 2023 Sep , 6. PMID:37674011[18]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Abe T, Kakyo M, Tokui T, Nakagomi R, Nishio T, Nakai D, Nomura H, Unno M, Suzuki M, Naitoh T, Matsuno S, Yawo H. Identification of a novel gene family encoding human liver-specific organic anion transporter LST-1. J Biol Chem. 1999 Jun 11;274(24):17159-63. PMID:10358072 doi:10.1074/jbc.274.24.17159
- ↑ Hsiang B, Zhu Y, Wang Z, Wu Y, Sasseville V, Yang WP, Kirchgessner TG. A novel human hepatic organic anion transporting polypeptide (OATP2). Identification of a liver-specific human organic anion transporting polypeptide and identification of rat and human hydroxymethylglutaryl-CoA reductase inhibitor transporters. J Biol Chem. 1999 Dec 24;274(52):37161-8. PMID:10601278 doi:10.1074/jbc.274.52.37161
- ↑ Tamai I, Nezu J, Uchino H, Sai Y, Oku A, Shimane M, Tsuji A. Molecular identification and characterization of novel members of the human organic anion transporter (OATP) family. Biochem Biophys Res Commun. 2000 Jun 24;273(1):251-60. PMID:10873595 doi:10.1006/bbrc.2000.2922
- ↑ Kullak-Ublick GA, Ismair MG, Stieger B, Landmann L, Huber R, Pizzagalli F, Fattinger K, Meier PJ, Hagenbuch B. Organic anion-transporting polypeptide B (OATP-B) and its functional comparison with three other OATPs of human liver. Gastroenterology. 2001 Feb;120(2):525-33. PMID:11159893 doi:10.1053/gast.2001.21176
- ↑ Michalski C, Cui Y, Nies AT, Nuessler AK, Neuhaus P, Zanger UM, Klein K, Eichelbaum M, Keppler D, Konig J. A naturally occurring mutation in the SLC21A6 gene causing impaired membrane localization of the hepatocyte uptake transporter. J Biol Chem. 2002 Nov 8;277(45):43058-63. PMID:12196548 doi:10.1074/jbc.M207735200
- ↑ Briz O, Serrano MA, MacIas RI, Gonzalez-Gallego J, Marin JJ. Role of organic anion-transporting polypeptides, OATP-A, OATP-C and OATP-8, in the human placenta-maternal liver tandem excretory pathway for foetal bilirubin. Biochem J. 2003 May 1;371(Pt 3):897-905. PMID:12568656 doi:10.1042/BJ20030034
- ↑ Hirano M, Maeda K, Shitara Y, Sugiyama Y. Contribution of OATP2 (OATP1B1) and OATP8 (OATP1B3) to the hepatic uptake of pitavastatin in humans. J Pharmacol Exp Ther. 2004 Oct;311(1):139-46. PMID:15159445 doi:10.1124/jpet.104.068056
- ↑ Kameyama Y, Yamashita K, Kobayashi K, Hosokawa M, Chiba K. Functional characterization of SLCO1B1 (OATP-C) variants, SLCO1B1*5, SLCO1B1*15 and SLCO1B1*15+C1007G, by using transient expression systems of HeLa and HEK293 cells. Pharmacogenet Genomics. 2005 Jul;15(7):513-22. PMID:15970799 doi:10.1097/01.fpc.0000170913.73780.5f
- ↑ Yamashiro W, Maeda K, Hirouchi M, Adachi Y, Hu Z, Sugiyama Y. Involvement of transporters in the hepatic uptake and biliary excretion of valsartan, a selective antagonist of the angiotensin II AT1-receptor, in humans. Drug Metab Dispos. 2006 Jul;34(7):1247-54. PMID:16624871 doi:10.1124/dmd.105.008938
- ↑ Liu L, Cui Y, Chung AY, Shitara Y, Sugiyama Y, Keppler D, Pang KS. Vectorial transport of enalapril by Oatp1a1/Mrp2 and OATP1B1 and OATP1B3/MRP2 in rat and human livers. J Pharmacol Exp Ther. 2006 Jul;318(1):395-402. PMID:16627748 doi:10.1124/jpet.106.103390
- ↑ Mahagita C, Grassl SM, Piyachaturawat P, Ballatori N. Human organic anion transporter 1B1 and 1B3 function as bidirectional carriers and do not mediate GSH-bile acid cotransport. Am J Physiol Gastrointest Liver Physiol. 2007 Jul;293(1):G271-8. PMID:17412826 doi:10.1152/ajpgi.00075.2007
- ↑ Leuthold S, Hagenbuch B, Mohebbi N, Wagner CA, Meier PJ, Stieger B. Mechanisms of pH-gradient driven transport mediated by organic anion polypeptide transporters. Am J Physiol Cell Physiol. 2009 Mar;296(3):C570-82. PMID:19129463 doi:10.1152/ajpcell.00436.2008
- ↑ van de Steeg E, Stránecký V, Hartmannová H, Nosková L, Hřebíček M, Wagenaar E, van Esch A, de Waart DR, Oude Elferink RP, Kenworthy KE, Sticová E, al-Edreesi M, Knisely AS, Kmoch S, Jirsa M, Schinkel AH. Complete OATP1B1 and OATP1B3 deficiency causes human Rotor syndrome by interrupting conjugated bilirubin reuptake into the liver. J Clin Invest. 2012 Feb;122(2):519-28. PMID:22232210 doi:10.1172/JCI59526
- ↑ van de Steeg E, van Esch A, Wagenaar E, Kenworthy KE, Schinkel AH. Influence of human OATP1B1, OATP1B3, and OATP1A2 on the pharmacokinetics of methotrexate and paclitaxel in humanized transgenic mice. Clin Cancer Res. 2013 Feb 15;19(4):821-32. PMID:23243220 doi:10.1158/1078-0432.CCR-12-2080
- ↑ Bednarczyk D, Boiselle C. Organic anion transporting polypeptide (OATP)-mediated transport of coproporphyrins I and III. Xenobiotica. 2016;46(5):457-66. PMID:26383540 doi:10.3109/00498254.2015.1085111
- ↑ Sprowl JA, Ong SS, Gibson AA, Hu S, Du G, Lin W, Li L, Bharill S, Ness RA, Stecula A, Offer SM, Diasio RB, Nies AT, Schwab M, Cavaletti G, Schlatter E, Ciarimboli G, Schellens JHM, Isacoff EY, Sali A, Chen T, Baker SD, Sparreboom A, Pabla N. A phosphotyrosine switch regulates organic cation transporters. Nat Commun. 2016 Mar 16;7:10880. PMID:26979622 doi:10.1038/ncomms10880
- ↑ Hau RK, Klein RR, Wright SH, Cherrington NJ. Localization of Xenobiotic Transporters Expressed at the Human Blood-Testis Barrier. Drug Metab Dispos. 2022 Jun;50(6):770-780. PMID:35307651 doi:10.1124/dmd.121.000748
- ↑ Shan Z, Yang X, Liu H, Yuan Y, Xiao Y, Nan J, Zhang W, Song W, Wang J, Wei F, Zhang Y. Cryo-EM structures of human organic anion transporting polypeptide OATP1B1. Cell Res. 2023 Dec;33(12):940-951. PMID:37674011 doi:10.1038/s41422-023-00870-8
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