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Target not currently curated in GtoImmuPdb

Target id: 768

Nomenclature: ABCB1

Abbreviated Name: MDR1, PGP1

Systematic Nomenclature: ABCB1

Family: ABCB subfamily

Gene and Protein Information Click here for help
Species TM AA Chromosomal Location Gene Symbol Gene Name Reference
Human 12 1280 7q21.12 ABCB1 ATP binding cassette subfamily B member 1
Mouse 12 1276 5 3.43 cM Abcb1a ATP-binding cassette, sub-family B (MDR/TAP), member 1A
Rat - - Abcb1a ATP binding cassette subfamily B member 1A
Previous and Unofficial Names Click here for help
P-glycoprotein 1 | ABC20 | CD243 | CLCS | GP170 | MDR1 | PGY1 | colchicin sensitivity | multidrug resistance protein 1 | Abcb1 | ATP-binding cassette, sub-family B (MDR/TAP), member 1 | ATP-binding cassette, subfamily B (MDR/TAP), member 1A | Mdr1a | multiple drug resistant 1a | Evi32 | MDR3 | mdr-3 | Pgp | Pgy3 | Pgy-3 | P-gp | Abcb1a | ATP binding cassette subfamily B member 1 | ATP-binding cassette
Database Links Click here for help
ChEMBL Target
DrugBank Target
Ensembl Gene
Entrez Gene
Human Protein Atlas
Selected 3D Structures Click here for help
Image of receptor 3D structure from RCSB PDB
Description:  Molecular structure of human P-glycoprotein (ABCB1) in the ATP-bound, outward-facing conformation
PDB Id:  6C0V
Ligand:  ATP   This ligand is endogenous
Resolution:  3.4Å
Species:  Human
References:  2

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Key to terms and symbols View all chemical structures Click column headers to sort
Ligand Sp. Action Value Parameter Reference
compound 14 [PMID: 30925062] Small molecule or natural product Click here for species-specific activity table Hs Competitive 5.8 – 6.2 pIC50 5
pIC50 6.2 (IC50 6.76x10-7 M) [5]
Description: Measuring inhibition of cyclosporine A transport in A2780/ADR cells expressing hABCB1.
pIC50 5.8 (IC50 1.73x10-6 M) [5]
Description: Measuring inhibition of calcein AM transport in A2780/ADR cells expressing hABCB1.
Biologically Significant Variant Comments
Nonsense mutation in ABCB1 has been described in collie dogs [3-4] and when these animals are treated with ivermectin they develop potentially fatal neurologic disorders, due to a toxic accumulation of ivermectin in the central nervous system. Similar ivermectin-induced pathology has been noted in humans. In 2020 mutated human ABCB1 alleles were identified in a patient who developed serious ivermectin toxicity following a single oral dose of the drug. Genetic analysis revealed that this patient harboured a different nonsense alteration in each copy of their ABCB1 genes. Both mutations generated premature stop codons and truncated transporter proteins that lacked the C-terminal nucleotide-binding domain, rendering the proteins incapable of drug-transport [1].


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1. Baudou E, Lespine A, Durrieu G, André F, Gandia P, Durand C, Cunat S. (2020) Serious Ivermectin Toxicity and Human ABCB1 Nonsense Mutations. N Engl J Med, 383: 787-789 [Epub ahead of print]. DOI: 10.1056/NEJMc1917344

2. Kim Y, Chen J. (2018) Molecular structure of human P-glycoprotein in the ATP-bound, outward-facing conformation. Science, 359 (6378): 915-919. [PMID:29371429]

3. Mealey KL. (2004) Therapeutic implications of the MDR-1 gene. J Vet Pharmacol Ther, 27 (5): 257-64. [PMID:15500562]

4. Schinkel AH, Smit JJ, van Tellingen O, Beijnen JH, Wagenaar E, van Deemter L, Mol CA, van der Valk MA, Robanus-Maandag EC, te Riele HP et al.. (1994) Disruption of the mouse mdr1a P-glycoprotein gene leads to a deficiency in the blood-brain barrier and to increased sensitivity to drugs. Cell, 77 (4): 491-502. [PMID:7910522]

5. Silbermann K, Stefan SM, Elshawadfy R, Namasivayam V, Wiese M. (2019) Identification of Thienopyrimidine Scaffold as an Inhibitor of the ABC Transport Protein ABCC1 (MRP1) and Related Transporters Using a Combined Virtual Screening Approach. J Med Chem, 62 (9): 4383-4400. [PMID:30925062]


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