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1: Mol Endocrinol. 1994 Sep;8(9):1208-14.Click here to read Links

Serine 167 is the major estradiol-induced phosphorylation site on the human estrogen receptor.

Arnold SF, Obourn JD, Jaffe H, Notides AC.

Department of Environmental Medicine, University of Rochester School of Medicine and Dentistry, New York 14642.

Serine 167 has been identified by radiolabel and amino acid sequencing as the major estrogen-induced phosphorylation site on the human estrogen receptor (hER) from human MCF-7 mammary carcinoma cells. The phosphorylation of the hER on serine 167 was estrogen-dependent, increasing 4-fold upon estradiol treatment of MCF-7 cells and accounted for almost half of the total [32P]phosphate incorporated into the recombinant hER from Sf9 insect cells and the native hER from MCF-7 cells. Casein kinase II was found to phosphorylate the purified recombinant hER on serine 167 in vitro. In addition, estradiol binding enhanced by 2-fold the phosphorylation of the purified recombinant hER by casein kinase II in vitro. Western blot analysis and [32P]phosphate incorporation confirmed the presence of casein kinase II in Sf9 cells. These results demonstrate that the hER is phosphorylated on serine 167 by casein kinase II in a hormone-dependent manner.

PMID: 7838153 [PubMed - indexed for MEDLINE]

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