Mouse uterus estradiol receptor undergoes a inactivation-reactivation process "in vitro". The specific estrogen binding activity inactivated by nuclei, apparently through a dephosphorylation process (1,2,3), is reactivated by an ATP-dependent process. The enzyme reactivating the receptor has been purified from calf uterus cytosol. It shows high affinity for the inactive receptor (Km of ∼ 0.3 × 10-9 mol of 17β-estradiol binding sites/l); it is simulated by MgCl2 and CaCl2. Present and previous results suggest that in cytoplasm of intact cells a phosphorylation process makes the receptor able to bind hormone and in nuclei dephosphorylation of receptor causes loss of hormone binding activity.
|Number of pages||8|
|Journal||Biochemical and Biophysical Research Communications|
|Publication status||Published - Aug 31 1981|
ASJC Scopus subject areas
- Molecular Biology