由該基因編碼的膜相關蛋白是ATP結合盒（ABC）轉運蛋白超家族的成員。ABC蛋白通過細胞外膜和細胞內膜轉運各種分子。ABC基因分為7個不同的亞家族（abc1，mdr/tap，mrp，ald，oabp，gcn20，white）。這種蛋白是MDR/TAP亞家族的成員。MDR/TAP亞家族成員參與多藥耐藥。該基因編碼的蛋白質是一種具有廣泛底物特異性的外源性化合物的ATP依賴性藥物外排泵。它負責減少多藥耐藥細胞中的藥物積累，并經常介導抗腫瘤藥物的發展。這種蛋白也作為血腦屏障的轉運蛋白發揮作用。
The membrane-associated protein encoded by this gene is a member of the superfamily of ATP-binding cassette (ABC) transporters. ABC proteins transport various molecules across extra- and intra-cellular membranes. ABC genes are divided into seven distinct subfamilies (ABC1, MDR/TAP, MRP, ALD, OABP, GCN20, White). This protein is a member of the MDR/TAP subfamily. Members of the MDR/TAP subfamily are involved in multidrug resistance. The protein encoded by this gene is an ATP-dependent drug efflux pump for xenobiotic compounds with broad substrate specificity. It is responsible for decreased drug accumulation in multidrug-resistant cells and often mediates the development of resistance to anticancer drugs. This protein also functions as a transporter in the blood-brain barrier.