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Labelling of oviduct nuclear and nucleolar proteins during estrogen induced differentiation

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Summary

The effect of secondary stimulation with estrogen on synthesis of nuclear and nucleolar proteins is studied in chick oviduct.

Isolated nuclei and nucleoli have a protein/DNA ratio of 5.2 and 5.6, respectively. 35% of nuclear and nucleolar protein is recovered in the histone fraction after hydroxylapatite chromatography. Gel electrophoretic separations of nuclear and nucleolar nonhistones are largely similar as to visible bands and distribution of radioactivity. Nucleoli bind 1.4 times more [3H] estradiol as compared to whole nuclei.

Nucleolar histones are labelled slightly more actively with [3H] leucine than nuclear histones; nucleolar nonhistones are labelled about 3 times more actively than nuclear nonhistones. An 18 hour secondary stimulation with estrogen increases the radioactivity of histones by 6-fold and that of nonhistones by 2.5-fold in whole nuclei as well as in nucleoli. Stimulation appears to increase preferentially radioactivity of nonhistones at 50 000 daltons. As this change is observed in whole nuclei and nucleoli and is not reduced with hydroxyurea, it is suggested that this may be related to a gross structural reorganisation of chromatin induced by the hormone.

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  1. Department of Medical Chemistry, University of Helsinki, Siltavuorenpenger 10 A, 00170, Helsinki 17, Finland

    Kari Hemminki

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  1. Kari Hemminki
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Hemminki, K. Labelling of oviduct nuclear and nucleolar proteins during estrogen induced differentiation. Mol Cell Biochem 11, 9–15 (1976). https://doi.org/10.1007/BF01792830

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  • DOI: https://doi.org/10.1007/BF01792830

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