ATP-binding cassette sub-family B member 9 is a protein that in humans is encoded by the ABCB9gene.[1][2]
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. The function of this half-transporter has not yet been determined; however, this protein may play a role in lysosomes. Alternative splicing of this gene results in distinct isoforms which are likely to have different substrate specifications.[2]
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Saito S, Iida A, Sekine A, et al. (2002). "Three hundred twenty-six genetic variations in genes encoding nine members of ATP-binding cassette, subfamily B (ABCB/MDR/TAP), in the Japanese population". J. Hum. Genet. 47 (1): 38–50. doi:10.1007/s10038-002-8653-6. PMID11829140.
Kobayashi A, Hori S, Suita N, Maeda M (2003). "Gene organization of human transporter associated with antigen processing-like (TAPL, ABCB9): analysis of alternative splicing variants and promoter activity". Biochem. Biophys. Res. Commun. 309 (4): 815–22. doi:10.1016/j.bbrc.2003.08.081. PMID13679046.
Ota T, Suzuki Y, Nishikawa T, et al. (2004). "Complete sequencing and characterization of 21,243 full-length human cDNAs". Nat. Genet. 36 (1): 40–5. doi:10.1038/ng1285. PMID14702039.
Homma K, Kikuno RF, Nagase T, et al. (2004). "Alternative splice variants encoding unstable protein domains exist in the human brain". J. Mol. Biol. 343 (5): 1207–20. doi:10.1016/j.jmb.2004.09.028. PMID15491607.
Wolters JC, Abele R, Tampé R (2005). "Selective and ATP-dependent translocation of peptides by the homodimeric ATP binding cassette transporter TAP-like (ABCB9)". J. Biol. Chem. 280 (25): 23631–6. doi:10.1074/jbc.M503231200. PMID15863492.
Ohashi-Kobayashi A, Ohashi K, Du WB, et al. (2006). "Examination of drug resistance activity of human TAP-like (ABCB9) expressed in yeast". Biochem. Biophys. Res. Commun. 343 (2): 597–601. doi:10.1016/j.bbrc.2006.03.002. PMID16554024.