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21.
P59, an hsp 90-binding protein. Cloning and sequencing of its cDNA and preparation of a peptide-directed polyclonal antibody. 总被引:8,自引:0,他引:8
M C Lebeau N Massol J Herrick L E Faber J M Renoir C Radanyi E E Baulieu 《The Journal of biological chemistry》1992,267(7):4281-4284
The primary sequence of the rabbit liver cDNA coding for protein p59 has been determined. The protein binds to the 90-kDa heat shock protein (hsp 90) and is associated with it, including when hsp 90 participates in hetero-oligomeric complexes of untransformed mammalian steroid receptors that sediment at 8-10 S. The cloned cDNA codes for an open reading frame of 458 amino acids defining a yet unknown protein. However, 55% amino acid homology to peptidyl-prolyl isomerase is found between amino acids 41 and 137, suggesting rotamase activity for p59, which speculatively may apply to bound hsp 90 and thus be implied in the intracellular trafficking of hetero-oligomeric forms of steroid hormone receptors. A polyclonal antibody derived from the COOH-terminal peptide 441-458 demonstrates a good affinity for rabbit, rat, and human "p59" protein. It interacts with at least one epitope, available in 8-10 S untransformed steroid receptor complexes and different from that recognized by the monoclonal antibody KN382/EC-1. 相似文献
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Jean-Marie Gasc Jack-Michel Renoir Lee E. Faber Francine Delahaye Etienne-Emile Baulieu 《Experimental cell research》1990,186(2):362-367
It has been proposed that the unliganded nontransformed form of steroid hormone receptor is a heterooligomer comprising, in addition to the hormone-binding subunit, two associated proteins: a heat shock protein of MW 90,000 (hsp90) and another protein of MW 59,000 (p59). Using monoclonal antibodies, we demonstrate immunocytochemically the presence of both hsp90 and p59 in cell nuclei of progesterone target cells of the rabbit uterus. While steroid receptors (e.g., progesterone receptors) appear to be exclusively nuclear, we find p59 predominantly in the cell nuclei and hsp90 in both the nucleus and the cytoplasm. In addition, Western blotting of high-salt extracts of nuclear proteins detects the presence of hsp90 and p59 in the nuclei of rabbit uterus. These observations are consistent with the presence of the untransformed heterooligomeric form of steroid hormone receptors in the nuclei of target cells. 相似文献
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Grard Morel Paul Dubois Claudine Benassayag Emmanuel Nunez Christine Radanyi Grard Redeuilh Hlne Richard-Foy Etienne-Emile Baulieu 《Experimental cell research》1981,132(2):249-257
Antiserum against calf uterus oestradiol receptor has been used for detecting oestradiol receptor in rat pituitary cells at the ultrastructural level after immunochemical reaction according to Sternberger. The gonadotropic, lactotropic and somatotropic cells were positive, but not the thyrotropic and corticotropic cells. In peripubertal and adult rats, both cytoplasmic and nuclear receptors were seen, but in a long-term castrated rat, the receptor was found only in the cytoplasm. After oestradiol administration to 21-day-old animals, the cytoplasmic receptor decreased and the nuclear receptor increased in gonadotropic cells, supporting the concept of hormone-receptor complex translocation. Antibodies against α1-foetoprotein demonstrated the presence of this oestrogen-binding plasma protein in all pituitary cells, but only in the cytoplasmic area. These results and the immunological controls related to antibody specificity give the first evidence of steroid receptor at the ultrastructural level. 相似文献
25.
The expression of progesterone receptor (PR) and its induction by oestradiol during the embryogenesis of the chick bursa of Fabricius (BF) were studied by immunohistochemistry using three different polyclonal antibodies to the chicken oviduct PR. Mesenchymal cells of the cloacal area surrounding the bursa primordium in controls (without exogenous oestrogen) express the PR between 9 and 11 days of incubation. In the same cells, PR was induced experimentally by oestradiol at 9 days. Mesenchymal cells in the bursa did not express PR after oestradiol treatment before the age of 11 days. The PR was not inducible in the bursal epithelium or in haemopoietic cells. None of the bursal cells expressed the PR to a detectable level during embryonic life without exogenous treatment. Some haemopoietic cells showed strong artefactual staining in their nuclei. It is concluded that (1) the embryonic bursa of Fabricius is a sex-steroid-sensitive organ, (2) exogenous oestradiol is able to induce progesterone receptor in the mesenchymal cells, but (3) the PR is not expressed without exogenous oestrogen. This indicates that the PR becomes oestrogen inducible well before it is naturally expressed during sexual maturation and that the level of endogenous oestrogen during embryonic life is not high enough to affect the bursa significantly. 相似文献
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A region in the steroid binding domain determines formation of the non-DNA-binding, 9 S glucocorticoid receptor complex 总被引:11,自引:0,他引:11
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