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- W2088916039 abstract "Nuclear thyroid hormone receptor was purified to 904 pmol of L-3,5,3'-triiodothyronine (T3) binding capacity per mg of protein with 2.5-5.2% recovery by sequentially using hydroxylapatite column chromatography, ammonium sulfate precipitation, Sephadex G-150 gel filtration, DNA-cellulose column chromatography, DEAE-Sephadex column chromatography, and heparin-Sepharose column chromatography. Assuming that one T3 molecule binds to the 49,000-Da unit of the receptor, we reproducibly obtained 6.4-14.7 micrograms of receptor protein with 4.2-4.9% purity from 4-5 kg of rat liver. Elution of receptor from the heparin-Sepharose column was performed using 10 mM pyridoxal 5'-phosphate, which was observed to diminish binding of receptor to heparin-Sepharose or DNA-cellulose. This effect was specific for pyridoxal 5'-phosphate, since related compounds were not effective. Purified receptor bound T3 with high affinity (6.0 X 10(9) liter/mol), and the order of affinity of iodothyronine analogues to purified receptor was identical to that observed with crude receptor preparations [3,5,3'-triiodothyroacetic acid greater than L-T3 greater than D-3,5,3'-triiodothyronine (D-T3) greater than L-thyroxine greater than D-thyroxine]. Purified receptor had a sedimentation coefficient of 3.4 S, Stokes radius of 34 A, and calculated molecular mass of 49,000. Among several bands identified by silver staining after electrophoresis in NaDodSO4/polyacrylamide gels, one 49,000-Da protein showed photoaffinity labeling with [125I]thyroxine that was displaceable with excess unlabeled T3. The tryptic fragment and endogenous proteinase-digested fragment of the affinity-labeled receptor showed saturable binding in 27,000-Da and 36,000-Da peptides, respectively. These molecular masses are in agreement with estimates from gel filtration and gradient sedimentation, indicating that affinity labeling occurred at the hormone binding domain of nuclear thyroid hormone receptor. This procedure reproducibly provides classical native rat liver T3 nuclear receptor in useful quantity and purity and of the highest specific activity so far reported." @default.
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- W2088916039 title "Purification and characterization of rat liver nuclear thyroid hormone receptors." @default.
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- W2088916039 doi "https://doi.org/10.1073/pnas.84.10.3420" @default.
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