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• W1488337588 abstract "We have studied chick oviduct progesterone receptor subunits and their effect on RNA transcription in oviduct chromatin. Initiation of RNA chain synthesis was measured by the rifampicin-challenge assay. Progesterone receptor subunits A and B were purified 200-fold by sequential chromatography on phosphocellulose, DEAE-cellulose, and hydroxylapatite. The subunits could be recombined to form the 6S receptor A-B dimer initially present in chick oviduct homogenates. The intact 6 S receptor dimer preparation increased transcription of oviduct chromatin by 40 to 60%. This increase corresponds to the creation of 5,800 new initiation sites per haploid cellular equivalent of DNA as chromatin. The increased chromatin transcription which resulted was half-maximal at a receptor concentration of about 5 x 10(-9) M. Preparations from other tissues which were devoid of progesterone-binding activity or oviduct preparations lacking progesterone did not stimulate rifampicin-resistant RNA synthesis. The oviduct receptor fraction contained no detectable glucocorticoid, androgen, or estrogen receptors. When isolated B subunits alone were incubated with chromatin, no transcriptional increase was detectable. Isolated A subunits increased chromatin transcription, but only at concentration approximately 10-fold higher than required of intact dimer. These observations suggest that the 6 S receptor dimer is the functional species in chromatin transcription in vivo; two hormones are required per dimer, one on each subunit. Since subunit A binds DNA and has stimulatory activity , a dimer dissociation at acceptor sites is postulated, liberating A subunits which stimulate RNA chain initiation sites." @default.
• W1488337588 created "2016-06-24" @default.
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• W1488337588 date "1976-09-01" @default.
• W1488337588 modified "2023-10-17" @default.
• W1488337588 title "Progesterone-binding components of chick oviduct. In vitro effect of receptor subunits on gene transcription." @default.
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• W1488337588 doi "https://doi.org/10.1016/s0021-9258(17)33144-7" @default.
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