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- W2088731092 abstract "Possible changes in the size and shape of the glucocorticoid-receptor complex (GRC) following activation remain poorly documented, due to the lability and possible activation of the receptor during the determination of these hydrodynamic parameters. In the present study molybdate was used to stabilize the GRC, thus preventing these uncontrolled transformations. Cytosol prepared from mouse whole brains was incubated for 18 h at 0-2 degrees C with [3H]triamcinolone acetonide (+/- molybdate). Activation was then initiated by incubation at 22 degrees C for variable times and quenched at 0 degree C by adding molybdate. The Stokes radius and sedimentation coefficient of the GRC declined from 77 A and 9.2 S before activation to 58 A and 3.8 S after activation. These measurements remained consistent after recycling GRC between sedimentation and gel filtration procedures and correspond to a 3-fold reduction in the relative molecular mass. The loss and formation of the 297 and 92 kDa species, respectively, after different durations of activation correlated nearly perfectly with increased binding of GRC to DNA-cellulose (DNA-C). The observed size change also correlated well with decreased adsorption to DEAE-cellulose filters (DE-81) and increased adsorption to glass fiber filters (GF/C). The increased adsorption to GF/C may reflect an increase in hydrophobicity which, with extended durations of activation, leads to increased aggregation and reduced binding to DNA-C, but not to a change in adsorption to DE-81. We propose that during activation the 297 kDa form of the GRC splits to form a 92 kDa species that displays an increased affinity for DNA." @default.
- W2088731092 created "2016-06-24" @default.
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- W2088731092 date "1984-02-01" @default.
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- W2088731092 title "Hydrodynamic and biochemical correlates of the activation of the glucocorticoid-receptor complex" @default.
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- W2088731092 doi "https://doi.org/10.1016/0022-4731(84)90122-5" @default.
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