GREB1 (gene regulated by estrogen in breast cancer 1) was first identified as an oestrogen-regulated gene expressed in breast cancer [1]. Its exact function is not known but its expression is regulated by the coordinated binding of oestrogen-receptors to distal sites interacting with Pol II to activate gene transcription from core promoters located at a considerable distance from the greb1 gene [2,3,4]. This entry represents the C-terminal domain, which may adopt a twisted alpha/beta structure comprising parallel beta-sheets connected by alpha-helices that surround the sheet, as revealed from structure predictions.

1: PDZK1 and GREB1 are estrogen-regulated genes expressed in hormone-responsive breast cancer. Ghosh MG, Thompson DA, Weigel RJ; Cancer Res. 2000;60:6367-6375. PMID:11103799

2: GREB 1 is a critical regulator of hormone dependent breast cancer growth. Rae JM, Johnson MD, Scheys JO, Cordero KE, Larios JM, Lippman ME; Breast Cancer Res Treat. 2005;92:141-149. PMID:15986123

3: GREB1 is a novel androgen-regulated gene required for prostate cancer growth. Rae JM, Johnson MD, Cordero KE, Scheys JO, Larios JM, Gottardis MM, Pienta KJ, Lippman ME; Prostate. 2006;66:886-894. PMID:16496412

4: Long-range activation of GREB1 by estrogen receptor via three distal consensus estrogen-responsive elements in breast cancer cells. Sun J, Nawaz Z, Slingerland JM; Mol Endocrinol. 2007;21:2651-2662. PMID:17666587