BCAR3 (breast cancer anti-estrogen resistance 3) belongs to the SH2 domain-containing protein (NSP) family. In humans, this family contains three members namely, NSP1, NSP2/BCAR3 and NSP3. BCAR3 shows high homology to Cdc25 family of Rac GEFs, and contains a GEF (GDP-exchange factor)-like domain in its C-terminal. It also contains an SH2 domain, and a proline/serine-rich domain. It was first described in two estrogen-dependent human breast cancer cell lines, as the gene responsible for anti-estrogen resistance. It has a molecular weight of 95kDa.
Synonyms: Anti-Breast cancer anti-estrogen resistance protein 3; Anti-Novel SH2-containing protein 2; Anti-SH2 domain- containing protein 3B
Storage: -20C
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Biochem Physiol Actions: BCAR3 (breast cancer anti-estrogen resistance 3) is up-regulated in breast cancers, and is related to invasive and advanced breast cancer type. It facilitates advancement of breast cancer, by activating intracellular signaling pathways essential for metastasis. It is an interacting partner of p130Cas, which in turn activates Rac1. It regulates cell survival, proliferation and movement, by facilitating the interaction between Cas and the protein tyrosine kinase c-Src. It facilitates the progression of cell cycle by interacting with epidermal growth factor (EGF) through its SH2 domain. It promotes cell division in normal human breast MCF-12A cells. It is responsible for anti-estrogen resistance in breast cancer cells by activating PI3K (phosphatidylinositol 3-kinase), which in turn activates Rac pathway.
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