Biol Reprod Keystone Symposia Conference on Frontiers in Reproductive Biology & Regulation of Fertility.
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Biology of Reproduction, Vol 12, 134-142, Copyright © 1975 by Society for the Study of Reproduction

Progesterone Receptors of Chick Oviduct: Identification of 6S Receptor Dimers

WILLIAM T. SCHRADER 1, SHARON S. HEUER 1, , and BERT W. O’MALLEY 1

1 Department of Cell Biology, Baylor College of Medicine, Houston, Texas 77025


A 6S progesterone receptor form has been identified in chick oviduct cytosol fractions. It has been shown to consist of equal amounts of two 4S receptor subunits, A and B, previously shown to bind in nuclei to DNA and chromatin sites respectively. The 6S form is tentatively defined as a dimer of both A and B subunits. It is present in cytosol under conditions in which large in vitro aggregate formation (8S) is prevented. The 6S dimer co-chromatographs with authentic receptor B on DEAE-cellulose, but does not bind to phosphocellulose. Dissociation of the dimer with salt or temperature liberates the receptor subunits in their monomeric 4S forms.




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J. Norris and P. Kohler
Characterization of the androgen receptor from a Syrian hamster ductus deferens tumor cell line (DDT1)
Science, May 28, 1976; 192(4242): 898 - 900.
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Copyright © 1975 by the Society for the Study of Reproduction.