ABCG2 Antibody (BCRP)

ATP-binding cassette, subfamily g, member 2, also known as ABCP, BCRP or MRX,is aprotein that in humans is encoded by the ABCG2gene. Thegene encodes a membrane transporter belonging to the ATP-binding cassette(ABC) superfamily of membrane transporters, which are involved in the trafficking of biologic molecules across cell membranes.Theprotein is also a high capacity transporter for uric acid excretion in the kidney, liver, and gut. The ABCG2 gene is mapped on 4q22.1. In vitro assays of isolated membrane preparations revealed a high-capacity, vanadate-sensitive ATPase activity associated withABCG2expression that was stimulated by compounds known to be transported by this protein. Ozvegy et al.(2001)concluded thatthe proteinis likely functioning as a homodimer or homooligomer in this expression system since it is unlikely that putative Sf9 transport partners would be overexpressed at similarly high levels.Abcg2transports pheophorbide-a, which occurs in various plant-derived foods and food supplements and is highly efficient in limiting its uptake from ingested food.ABCG2is a major factor in the concentrative transfer of drugs, carcinogens, and dietary toxins to the milk of mice, cows, and humans.