8PG0

Human OATP1B3

Summary for 8PG0

• Entry DOI: 10.2210/pdb8pg0/pdb
• EMDB information: 17655
• Descriptor: Solute carrier organic anion transporter family member 1B3, Fab19 (heavy chain, variable region), Fab19 (light chain, variable region), ... (6 entities in total)
• Functional Keywords: organic anion, bicarbonate, slco1b3, uptake, drug, transporter, polypeptide, liver, transport protein
• Biological source: Homo sapiens (human); More
• Total number of polymer chains: 3
• Total formula weight: 127779.10

Authors

Ciuta, A.-D.,Nosol, K.,Kowal, J.,Mukherjee, S.,Ramirez, A.S.,Stieger, B.,Kossiakoff, A.A.,Locher, K.P. (deposition date: 2023-06-17, release date: 2023-09-27)

Primary citation

Ciuta, A.D.,Nosol, K.,Kowal, J.,Mukherjee, S.,Ramirez, A.S.,Stieger, B.,Kossiakoff, A.A.,Locher, K.P.
Structure of human drug transporters OATP1B1 and OATP1B3.
Nat Commun, 14:5774-5774, 2023

PubMed Abstract: The organic anion transporting polypeptides OATP1B1 and OATP1B3 are membrane proteins that mediate uptake of drugs into the liver for subsequent conjugation and biliary excretion, a key step in drug elimination from the human body. Polymorphic variants of these transporters can cause reduced drug clearance and adverse drug effects such as statin-induced rhabdomyolysis, and co-administration of OATP substrates can lead to damaging drug-drug interaction. Despite their clinical relevance in drug disposition and pharmacokinetics, the structure and mechanism of OATPs are unknown. Here we present cryo-EM structures of human OATP1B1 and OATP1B3 bound to synthetic Fab fragments and in functionally distinct states. A single estrone-3-sulfate molecule is bound in a pocket located in the C-terminal half of OATP1B1. The shape and chemical nature of the pocket rationalize the preference for diverse organic anions and allow in silico docking of statins. The structure of OATP1B3 is determined in a drug-free state but reveals a bicarbonate molecule bound to the conserved signature motif and a histidine residue that is prevalent in OATPs exhibiting pH-dependent activity.

PubMed: 37723174
DOI: 10.1038/s41467-023-41552-8

Experimental method

ELECTRON MICROSCOPY (2.97 Å)