ABCG2 siRNA – ATP-Binding Cassette Sub-Family G Member 2 (Mouse)

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 a breast cancer resistance protein, the human protein functions as a xenobiotic transporter which may play a major role in multi-drug resistance. This protein likely serves as a cellular defense mechanism in response to mitoxantrone and anthracycline exposure. [provided by RefSeq, Jul 2008]

ABCG2: Xenobiotic transporter that may play an important role in the exclusion of xenobiotics from the brain. May be involved in brain-to-blood efflux. Appears to play a major role in the multidrug resistance phenotype of several cancer cell lines. When overexpressed, the transfected cells become resistant to mitoxantrone, daunorubicin and doxorubicin, display diminished intracellular accumulation of daunorubicin, and manifest an ATP- dependent increase in the efflux of rhodamine 123. Monomer or homodimer; disulfide-linked. Up-regulated in brain tumors. Highly expressed in placenta. Low expression in small intestine, liver and colon. Belongs to the ABC transporter superfamily. ABCG family. Eye pigment precursor importer (TC 3.A.1.204) subfamily. 2 isoforms of the human protein are produced by alternative splicing.

Protein type: Transporter; Transporter, iron; Membrane protein, integral; Membrane protein, multi-pass; Transporter, ABC family

Cellular Component: nucleoplasm; membrane; mitochondrion; apical plasma membrane; integral to membrane; plasma membrane; nucleus

Molecular Function: protein dimerization activity; protein homodimerization activity; ATPase activity; nucleotide binding; drug transporter activity; ATP binding

Biological Process: urate metabolic process; drug transport; transport; drug export; embryonic process involved in female pregnancy; multidrug transport