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 as well as antigen presentation.  This half-transporter likely plays a role in mitochondrial function.  Localized to 2q26, this gene is considered a candidate gene for lethal neonatal metabolic syndrome, a disorder of mitochondrial function.