This gene encodes a mitogen-responsive phosphoprotein. It is expressed in normal ovarian epithelial cells, but is down-regulated or absent from ovarian carcinoma cell lines, suggesting its role as a tumor suppressor. This protein binds to the SH3 domains of GRB2, an adaptor protein that couples tyrosine kinase receptors to SOS (a guanine nucleotide exchange factor for Ras), via its C-terminal proline-rich sequences, and may thus modulate growth factor/Ras pathways by competing with SOS for binding to GRB2. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. Protein Interaction Partner: Fcho2, CPSF7, SMURF2, YLPM1, C14orf166, ACOT9, CPSF6, SF3B2, MALT1, HSPH1, SEC23B, SEC24B, NUP155, CDC16, TRIO, TFAP2A, AURKA, PYCR1, PRDX1, MYO6, HSPA1B, HNRNPL, GRB2, FN1, CLTC, AP2M1, CFTR, CCNT1, ACTB, AHCY, AP2B1, AP2A2, AP2A1, DYT10, ATXN1L, SH3KBP1 Protein Size: 552