ABCB1 Translocates drugs and phospholipids across the membrane. Catalyzes the flop of phospholipids from the cytoplasmic to the exoplasmic leaflet of the apical membrane. Participates mainly to the flop of phosphatidylcholine, phosphatidylethanolamine, beta-D-glucosylceramides and sphingomyelins. Energy-dependent efflux pump responsible for decreased drug accumulation in multidrug-resistant cells. Belongs to the ABC transporter superfamily. ABCB family. Multidrug resistance exporter (TC 3.A.1.201) subfamily. Expressed in liver, kidney, small intestine and brain. 2 alternatively spliced human isoforms have been reported. Note: This description may include information from UniProtKB.
Protein type: Cell adhesion; EC; Hydrolase; Membrane protein, integral; Membrane protein, multi-pass; Transporter; Transporter, ABC family
Chromosomal Location of mouse Ortholog: 5 A1|5 3.43 cM
Cellular Component:  apical part of cell; apical plasma membrane; brush border membrane; cell surface; integral component of membrane; intercellular canaliculus; membrane; plasma membrane
Molecular Function:  ATP binding; ATPase activity; ATPase activity, coupled; ATPase activity, coupled to transmembrane movement of substances; ceramide-translocating ATPase activity; nucleotide binding; phosphatidylcholine-translocating ATPase activity; phosphatidylethanolamine-translocating ATPase activity; xenobiotic transmembrane transporting ATPase activity
Biological Process:  carbohydrate export; ceramide translocation; daunorubicin transport; drug export; drug transmembrane transport; drug transport; drug transport across blood-brain barrier; establishment of blood-brain barrier; establishment of blood-retinal barrier; G2/M transition of mitotic cell cycle; hormone transport; intestinal absorption; maintenance of permeability of blood-brain barrier; negative regulation of cell death; phospholipid translocation; positive regulation of anion channel activity; positive regulation of establishment of Sertoli cell barrier; positive regulation of response to drug; protein localization to bicellular tight junction; regulation of chloride transport; regulation of intestinal absorption; regulation of response to osmotic stress; stem cell proliferation; transmembrane transport
Reference #:  P21447 (UniProtKB)
Alt. Names/Synonyms: ABCB1; Abcb1a; Abcb4; ATP-binding cassette sub-family B member 1A; ATP-binding cassette, sub-family B (MDR/TAP), member 1A; ATP-binding cassette, sub-family B (MDR/TAP), member 4; ATP-binding cassette, subfamily B, member 1A; ATP-dependent translocase ABCB1; ecotropic viral integration site 32; Evi; Evi32; Mdr; mdr-; mdr-3; MDR1A; Mdr3; multi-drug resistance 3; Multidrug resistance protein 1A; Multidrug resistance protein 3; multiple drug resistant 1a; P glycoprotein 3; P-glycoprotein 3; P-gp; Pgp; Pgy; Pgy-; Pgy-3; Pgy3; Phospholipid transporter ABCB1
Gene Symbols: Abcb1a
Molecular weight: 140,647 Da
Basal Isoelectric point: 8.94  Predict pI for various phosphorylation states
Protein-Specific Antibodies, siRNAs or Recombinant Proteins from Cell Signaling Technology® Total Proteins
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Protein Structure Not Found.

Cross-references to other databases:  AlphaFold  |  STRING  |  Reactome  |  BioGPS  |  Pfam  |  RCSB PDB  |  ENZYME  |  Phospho3D  |  Phospho.ELM  |  NetworKIN  |  UniProtKB  |  Entrez-Gene  |  Ensembl Gene