ABCG2

ATP-binding cassette, sub-family G (WHITE), member 2
Identifiers
Symbols	ABCG2; ABC15; ABCP; BCRP; BCRP1; BMDP; CD338; CDw338; EST157481; GOUT1; MRX; MXR; MXR1; UAQTL1
External IDs	OMIM: 603756 MGI: 1347061 HomoloGene: 55852 ChEMBL: 5393 GeneCards: ABCG2 Gene
Gene Ontology Molecular function • transporter activity • protein binding • ATP binding • xenobiotic-transporting ATPase activity • heme transporter activity • ATPase activity, coupled to transmembrane movement of substances • protein homodimerization activity Cellular component • plasma membrane • integral to membrane Biological process • transport • drug transmembrane transport • cellular iron ion homeostasis • heme transport • response to drug • small molecule metabolic process • urate metabolic process • transmembrane transport Sources: Amigo / QuickGO
RNA expression pattern
More reference expression data
Orthologs
Species	Human	Mouse
Entrez	9429	26357
Ensembl	ENSG00000118777	ENSMUSG00000029802
UniProt	Q9UNQ0	Q7TMS5
RefSeq (mRNA)	NM_001257386	NM_011920
RefSeq (protein)	NP_001244315	NP_036050
Location (UCSC)	Chr 4: 89.01 – 89.15 Mb	Chr 6: 58.58 – 58.69 Mb
PubMed search	[1]	[2]

ATP-binding cassette sub-family G member 2 is a protein that in humans is encoded by the ABCG2 gene. ABCG2 has also been designated as CDw338 (cluster of differentiation w338).

The membrane-associated protein encoded by this gene is included in 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 White subfamily. Alternatively referred to as the Breast Cancer Resistance Protein, this protein functions as a xenobiotic transporter which may play a role in multi-drug resistance to chemotherapeutic agents including mitoxantrone and camptothecin analogues. Early observations of significant ABCG2-mediated resistance to anthracyclines were subsequently attributed mutations encountered in vitro but not in nature or the clinic. Significant expression of this protein has been observed in the placenta, and it has been shown to have a role in protecting the fetus from xenobiotics in the maternal circulation. The transporter has also been shown to play protective roles in blocking absorption at the apical membrane of the intestine, and at the blood-testis barrier, the blood–brain barrier, and the membranes of hematopoietic progenitor and other stem cells. At the apical membranes of the liver and kidney, it enhances excretion of xenobiotics. In the lactating mammary gland, it has a role in excreting vitamins such as riboflavin and biotin into milk.

Interactive pathway map

Click on genes, proteins and metabolites below to link to respective articles. [[File: [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] |{{{bSize}}}px]] Fluorouracil (5-FU) Activity edit

Click on genes, proteins and metabolites below to link to respective articles. [[File: [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] |{{{bSize}}}px]] Irinotecan Pathway edit

See also

• ATP-binding cassette transporter

Further reading

• Hazai E, Bikadi Z. (2008). "Homology modeling of breast cancer resistance protein (ABCG2).". J Struct Biol. 162 (1): 63–74. doi:10.1016/j.jsb.2007.12.001. PMID 18249138. 
• Abbott BL (2006). "ABCG2 (BCRP): a cytoprotectant in normal and malignant stem cells". Clin Adv Hematol Oncol. 4 (1): 63–72. PMID 16562373. 
• Schmitz G, Langmann T, Heimerl S (2002). "Role of ABCG1 and other ABCG family members in lipid metabolism.". J. Lipid Res. 42 (10): 1513–20. PMID 11590207. 
• Ejendal KF, Hrycyna CA (2003). "Multidrug resistance and cancer: the role of the human ABC transporter ABCG2.". Curr. Protein Pept. Sci. 3 (5): 503–11. doi:10.2174/1389203023380521. PMID 12369998. 
• Doyle LA, Ross DD (2003). "Multidrug resistance mediated by the breast cancer resistance protein BCRP (ABCG2).". Oncogene 22 (47): 7340–58. doi:10.1038/sj.onc.1206938. PMID 14576842. 
• Sugimoto Y, Tsukahara S, Ishikawa E, Mitsuhashi J (2005). "Breast cancer resistance protein: molecular target for anticancer drug resistance and pharmacokinetics/pharmacodynamics.". Cancer Sci. 96 (8): 457–65. doi:10.1111/j.1349-7006.2005.00081.x. PMID 16108826. 
• Ishikawa T, Tamura A, Saito H, et al. (2006). "Pharmacogenomics of the human ABC transporter ABCG2: from functional evaluation to drug molecular design.". Naturwissenschaften 92 (10): 451–63. doi:10.1007/s00114-005-0019-4. PMID 16160819. 
• Krishnamurthy P, Schuetz JD (2006). "Role of ABCG2/BCRP in biology and medicine.". Annu. Rev. Pharmacol. Toxicol. 46: 381–410. doi:10.1146/annurev.pharmtox.46.120604.141238. PMID 16402910. 
• Robey RW, Polgar O, Deeken J, et al. (2007). "ABCG2: determining its relevance in clinical drug resistance.". Cancer Metastasis Rev. 26 (1): 39–57. doi:10.1007/s10555-007-9042-6. PMID 17323127. 

External links

• ABCG2 protein, human at the US National Library of Medicine Medical Subject Headings (MeSH)

This article incorporates text from the United States National Library of Medicine, which is in the public domain.