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. This gene is located 7 kb telomeric to gene family member ABCB2. The protein encoded by this gene is involved in antigen presentation. This protein forms a heterodimer with ABCB2 in order to transport peptides from the cytoplasm to the endoplasmic reticulum. Mutations in this gene may be associated with ankylosing spondylitis, insulin-dependent diabetes mellitus, and celiac disease. Alternative splicing of this gene produces two products which differ in peptide selectivity and level of restoration of surface expression of MHC class I molecules.
ABC transporter, MHC 2; Antigen peptide transporter 2; APT2; ATP-binding cassette; ATP-binding cassette sub-family B member 3; ATP-binding cassette, sub-family B (MDR/TAP), member 3; Peptide supply factor 2; Peptide transporter involved in antigen processing 2; Peptide transporter PSF2; Peptide transporter TAP2; PSF-2; Really interesting new gene 11 protein; sub-family B isoform 1 variant); Transporter 2 ATP-binding cassette sub-family B (MDR/TAP) (OTTHUMP00000193488) (Transporter 2; transporter 2, ABC (ATP binding cassette); transporter 2, ATP-binding cassette, sub-family B (MDR/TAP)