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- W1597702906 abstract "Treatment of rat liver cytosol containing temperature-transformed, [3H]dexamethasone-bound receptors at 0degree C with the sulfhydryl-modifying reagent methyl methanethiosulfonate (MMTS) inhibits the DNA-binding activity of the receptor, and DNA-binding activity is restored after addition of dithiothreitol (DTT). When cytosol containing untransformed receptors is heated at 25 degrees C in the presence of MMTS, the 90-kDa heat shock protein dissociates from the receptor in the same manner as in the absence of MMTS, and the receptor will bind to DNA-cellulose if DTT is added subsequently at 0 degree C. These observations are consistent with the conclusion of Bodwell et al. (Bodwell, J. E., Holbrook. N. J. and Munck, A. (1984) Biochemistry 23, 1392-1398) that sulfhydryl moieties on the receptor are absolutely required for the receptor to bind to DNA, and they show that the sulfhydryl-modifying reagent does not inhibit the temperature-mediated dissociation of the heteromeric receptor complex that accompanies transformation to the DNA-binding state. When steroid-receptor complexes that are prebound to DNA-cellulose are exposed to MMTS, the steroid rapidly dissociates, but the receptor remains bound to DNA. Thus, the presence of steroid is not required for the receptor to remain bound to DNA in a high affinity manner. Treatment of cytosol containing transformed glucocorticoid-receptor complexes at 0 degrees C with 20 mM hydrogen peroxide also inactivates the DNA-binding activity of the receptor. The peroxide-induced inactivation is reversed by DTT. Incubation of rat liver cytosol containing untransformed glucocorticoid-receptor complexes at 25 degrees C with hydrogen peroxide prevents their transformation to the DNA-binding form as shown by their inability to bind to DNA-cellulose after addition of DTT. The presence of peroxide during heating of the cytosol also prevents dissociation of the receptor complex as assayed both by reduction in sedimentation value of the receptor and by dissociation of the 90-kDa heat shock protein from the steroid-binding protein. These results strongly suggest that critical sulfur moieties in the receptor complex must be in a reduced form for the temperature-mediated dissociation of the receptor to occur." @default.
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- W1597702906 date "1987-05-01" @default.
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- W1597702906 title "The role of sulfhydryl groups in permitting transformation and DNA binding of the glucocorticoid receptor." @default.
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- W1597702906 doi "https://doi.org/10.1016/s0021-9258(18)48192-6" @default.
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