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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

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

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.[1]


  1. Serine 167 is the major estradiol-induced phosphorylation site on the human estrogen receptor. Arnold, S.F., Obourn, J.D., Jaffe, H., Notides, A.C. Mol. Endocrinol. (1994) [Pubmed]
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