Protein: Bile salt export pump (EC 7.6.2.-) (ATP-binding cassette sub-family B member 11) (Sister of P-glycoprotein) (Q9QY30)
Organism: Mus musculus (Mouse)
Function: Catalyzes the transport of the major hydrophobic bile salts, such as taurine and glycine-conjugated cholic acid across the canalicular membrane of hepatocytes in an ATP-dependent manner, therefore participates in hepatic bile acid homeostasis and consequently to lipid homeostasis through regulation of biliary lipid secretion in a bile salts dependent manner. Transports taurine-conjugated bile salts more rapidly than glycine-conjugated bile salts (By similarity). Also transports non-bile acid compounds, such as pravastatin and fexofenadine in an ATP-dependent manner and may be involved in their biliary excretion (By similarity).
Subcellular location: Apical cell membrane {ECO:0000250|UniProtKB:O70127}; Multi-pass membrane protein {ECO:0000250|UniProtKB:O70127}. Recycling endosome membrane {ECO:0000250|UniProtKB:O70127}; Multi-pass membrane protein {ECO:0000250|UniProtKB:O70127}. Endosome {ECO:0000250|UniProtKB:O70127}. Cell membrane {ECO:0000250|UniProtKB:O70127}; Multi-pass membrane protein {ECO:0000250|UniProtKB:O70127}. Note=Internalized at the canalicular membrane through interaction with the adapter protein complex 2 (AP-2). At steady state, localizes in the canalicular membrane but is also present in recycling endosomes. ABCB11 constantly and rapidly exchanges between the two sites through tubulo-vesicles carriers that move along microtubules. Microtubule-dependent trafficking of ABCB11 is enhanced by taurocholate and cAMP and regulated by STK11 through a PKA-mediated pathway. Trafficking of newly synthesized ABCB11 through endosomal compartment to the bile canalicular membrane is accelerated by cAMP but not by taurocholate (By similarity). Cell membrane expression is up-regulated by short- and medium-chain fatty acids (By similarity). {ECO:0000250|UniProtKB:O70127, ECO:0000250|UniProtKB:O95342}.
Interaction partners:
- Hepatic sodium/bile acid cotransporter
- Solute carrier organic anion transporter family member 1B2
- Cytochrome P450 7A1
- Bile acid receptor
- Nuclear receptor subfamily 0 group B member 2
- Long-chain fatty acid transport protein 5
- 7-alpha-hydroxycholest-4-en-3-one 12-alpha-hydroxylase
- Phospholipid-transporting ATPase IC
- Organic solute transporter subunit alpha
- Ileal sodium/bile acid cotransporter
Sequence:
MSDSVILRSVKKFGEENHAFESDGFHNNDKKSRLQDKKKGEGARVGFFELFRFSSSKDNWLMFMGSVCALLHGMAQPGMIIVFGILTDIFVEYDIERQELSIPEKVCMNNTIVWINSSFNQNMTNGTSCGLVDINSEVIKFSGIYAGVGVAVLILGYFQIRLWVITGARQIRKMRKFYFRRIMRMEIGWFDCTSVGELNSRFSDDINKIDEAIADQMALFLQRLSTALSGLLLGFYRGWKLTLVILAVSPLIGIGAAVIGLSVAKFTELELKAYAKAGSIADEVLSSIRTVAAFGGENKEVERYEKNLMFAQRWGIWKGMVMGFFTGYMWCLIFFCYALAFWYGSRLVLDEGEYTPGTLIQIFLCVIIAAMNIGNASSCLEIFSTGCSAASSIFQTIDRQPVMDCMSGDGYKLDRIKGEIEFHNVTFHYPSRPEVKILNNLSMVIKPGETTAFVGSSGAGKSTALQLIQRFYDPCEGMVTLDGHDIRSLNIRWLRDQIGIVEQEPVLFSTTIAENIRLGREEATMEDIVQAAKDANAYNFIMALPQQFDTLVGEGGGQMSGGQKQRVAIARALIRKPKILLLDMATSALDNESEAKVQGALNKIQHGHTIISVAHRLSTVRSADVIIGFEHGTAVERGTHEELLERKGVYFMLVTLQSQEDNTHKETGIKGKDTTEGDTPERTFSRGSYQDSLRASIRQRSKSQLSHLSHEPPLAIGDHKSSYEDRKDNDVLVEEVEPAPVRRILKYNISEWPYILVGALCAAINGAVTPIYSLLFSQILKTFSLVDKEQQRSEIYSMCLFFVILGCVSLFTQFLQGYNFAKSGELLTKRLRKFGFKAMLRQDIGWFDDLKNNPGVLTTRLATDASQVQGATGSQVGMMVNSFTNIFVAVLIAFLFNWKLSLVISVFFPFLALSGAVQTKMLTGFASQDKEILEKAGQITNEALSNIRTVAGIGVEGRFIKAFEVELEKSYKTAIRKANVYGLCYAFSQGISFLANSAAYRYGGYLIVYEDLNFSYVFRVVSSIAMSATAVGRTFSYTPSYAKAKISAARFFQLLDRKPPIDVYSGAGEKWDNFQGKIDFIDCKFTYPSRPDIQVLNGLSVSVDPGQTLAFVGSSGCGKSTSIQLLERFYDPDQGTVMIDGHDSKKVNVQFLRSNIGIVSQEPVLFDCSIMDNIKYGDNTKEISVERAIAAAKQAQLHDFVMSLPEKYETNVGIQGSQLSRGEKQRIAIARAIVRDPKILLLDEATSALDTESEKTVQLALDKAREGRTCIVIAHRLSTIQNSDIIAVMSQGVVIEKGTHKKLMDQKGAYYKLVITGAPIS