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• W2000264170 abstract "The assumption that a different conformational form was induced in the nuclear estrogen receptor following binding by antiestrogens compared to estrogens was studied by analysing the proteolytic fragments of the receptor following limited digestion with chymotrypsin and trypsin. Nuclei were isolated from MCF-7 cells previously exposed to [3H] 4-OHTAM. The proteolytic digestion was performed either on the micrococcal nuclease hydrolysate or on intact nuclei. The molecular weights (Mr) were calculated from the sedimentation coefficients (S) determined on a sucrose gradient and from the Stokes radii (Rs) estimated by gel filtration. Digestion of the nuclei with micrococcal nuclease solubilized a receptor form of Mr = 155,000. This receptor form was degraded by chymotrypsin to a receptor of Mr = 63,000 which could not be further dissociated by 0.4 M KCl and 3 M urea. A similar receptor molecule was released by chymotrypsin from intact nuclei. Digestion of the micrococcal nuclease hydrolysate with trypsin degraded the receptor to a form of a Mr = 67,000 which could not be further dissociated by 0.4 M KCl and 3 M urea. Digestion of intact nuclei with trypsin followed by micrococcal nuclease, solubilized a receptor form of Mr = 80,000 which could be further dissociated with 0.4 M KCl and 3 M urea to a receptor form of Mr = 67,000. This trypsin degraded receptor form seems to be similar in Mr to the chymotrypsin degraded form. On the other hand different receptor fragments of Mr = 33,000 and Mr = 60,000 were excised by chymotrypsin and trypsin respectively from the estradiol ligated estrogen receptor. (Geier et al., J. steroid Biochem.26[1987] 35–40.) These results support the assumption of a different conformational form for the antiestrogen ligated receptor, compared to the estrogen ligated receptor since they were differentially susceptible to proteolytic degradation by chymotrypsin." @default.
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• W2000264170 date "1987-11-01" @default.
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• W2000264170 title "Analysis of the 4-hydroxytamoxifen (4-OHTAM) bound nuclear estrogen receptor from MCF-7 cells by limited proteolysis" @default.
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• W2000264170 doi "https://doi.org/10.1016/0022-4731(87)90504-8" @default.
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