PMID: 7087464Mar 1, 1982Paper

Effect of sodium molybdate on cytosolic estrogen receptor

Journal of Steroid Biochemistry
B MoncharmontP Cuatrecasas


Estrogen binding activity of crude calf uterus cytosol is rapidly destroyed in heating. The time course of inactivation at 37 degrees C shows a biphasic pattern; sodium molybdate (5-10 mM) completely blocks one of the components in the estradiol-free cytosol, while it has little effect on cytosolic receptor complexed with estradiol. Partially purified native 8S receptor loses its heat sensitivity, and, as a consequence, the molybdate effect disappears. By sucrose gradient analysis of crude cytosol it is evident that molybdate does not affect the sedimentation properties of the estradiol receptor at low temperature. However, at increasing temperatures, molybdate prevents the disappearance of the receptor peak in the crude cytosol or the formation of large, KCl-resistant, aggregates in the presence of estradiol. The partially purified native 8S receptor does not aggregate on heating; addition to it of receptor-depleted cytosol results in the recovery of heat inactivation and aggregate formation, and this is prevented by molybdate. Molybdate has no protective effect on any other inactivating agent which does not act through aggregation of receptors. A crude cytosolic preparation of the receptor which is unable to form heat-depende...Continue Reading


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Apr 1, 1977·Proceedings of the National Academy of Sciences of the United States of America·C J NielsenW B Pratt
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