Nuclear receptor coactivator 2 (NCOA2) (NCOA2)

Nuclear receptor coactivator 2 (NCOA2), also known as SRC-2 or TIF2, is a key member of the p160 steroid receptor coactivator family that mediates the transcriptional activity of various nuclear receptors, including those for steroid hormones, thyroid hormone, and vitamin D. It functions as a scaffold to recruit histone acetyltransferases and other chromatin-remodeling enzymes to promoter regions, thereby facilitating gene expression. Beyond its role in hormone signaling, NCOA2 is a critical regulator of energy metabolism, circadian rhythms, and reproductive processes such as endometrial decidualization. In oncology, NCOA2 is frequently implicated as an oncogene through gene amplification, overexpression, or the formation of chimeric fusion proteins in cancers like mesenchymal chondrosarcoma and acute myeloid leukemia. While traditionally considered difficult to target due to its disordered structure, experimental small molecule inhibitors like SI-2 and stimulators like MCB-613 have shown promise in preclinical models by disrupting coactivator complexes or inducing lethal proteotoxic stress in cancer cells.

Other names

TIF2SRC-2GRIP1KAT13CbHLHe75Transcriptional intermediary factor 2Steroid receptor coactivator 2Glucocorticoid receptor-interacting protein 1NCoA-2p160 steroid receptor coactivator 2

NCOA2 acts as a transcriptional coactivator by recruiting histone acetyltransferases and other chromatin-remodeling enzymes to nuclear receptors. Small molecule inhibitors like SI-2 reduce its protein levels and transcriptional activity, while stimulators like MCB-613 hyperactivate the protein to induce endoplasmic reticulum stress and reactive oxygen species in cancer cells.