Estradiol and phorbol ester cause phosphorylation of serine 118 in the human estrogen receptor.

Article Details

Citation

Joel PB, Traish AM, Lannigan DA

Estradiol and phorbol ester cause phosphorylation of serine 118 in the human estrogen receptor.

Mol Endocrinol. 1995 Aug;9(8):1041-52.

PubMed ID
7476978 [ View in PubMed
]
Abstract

Serine 118 is definitively identified as a major site of phosphorylation in the human estrogen receptor expressed in COS-1 cells treated with estradiol or phorbol ester. At least 30% of the estrogen receptor appears to be phosphorylated on serine 118 after treatment with estradiol or phorbol ester. Human estrogen receptor was expressed in COS-1 cells and labeled in vivo with [32P]orthophosphate in the presence of estradiol or phorbol ester. Immunopurified receptor was digested with cyanogen bromide. The most heavily labeled peptide (7 kilodaltons) was identified as amino acids 110-174 by microsequencing. Manual Edman degradation released a major portion of the 32P-label in the peptide at serine 118. A mutant with serine 118 replaced by alanine (S118A) had 80% less 32P-label in the 7 kilodalton peptide. Estrogen receptor labeled in vivo with [32P]-orthophosphate in the presence of estradiol or phorbol ester migrates electrophoretically as a doublet. The major difference between the bands is phosphorylation of serine 118 in the upshifted band. The mutant S118A does not show an upshifted band. Labeling of the estrogen receptor with [35S]methionine indicates that > or = 30% of the receptor is upshifted and suggests that > or = 30% of the receptor is phosphorylated on serine 118.

DrugBank Data that Cites this Article

Polypeptides
NameUniProt ID
Estrogen receptorP03372Details