ATP Binding Cassette Transporter B5 (ABCB5)

ABCB5 [ATP-Binding Cassette Subfamily B (MDR/TAP) Member 5] is a human ABC transporter and P-glycoprotein family member principally expressed in physiological skin and human malignant melanoma.ABCB5-alpha and -beta diverge after exon 6, with ABCB5-alpha including a seventh exon that encodes its 3-prime UTR, and ABCB5-beta including 14 more exons. The 131-amino acid ABCB5-alpha protein has a calculated molecular mass of 15 kD. It has an ABC signature motif and a Walker B consensus sequence, but no Walker A consensus sequence. In contrast, ABCB5-beta has an N-terminal ABC signature motif and Walker B motif, followed by 6 transmembrane domains and C-terminal Walker A, ABC signature, and Walker B motifs.