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. 1993 Nov 15;90(22):10434–10438. doi: 10.1073/pnas.90.22.10434

Interaction of glucocorticosteroid receptor and wild-type or mutated 90-kDa heat shock protein coexpressed in baculovirus-infected Sf9 cells.

F Cadepond 1, N Binart 1, B Chambraud 1, N Jibard 1, G Schweizer-Groyer 1, I Segard-Maurel 1, E E Baulieu 1
PMCID: PMC47791  PMID: 8248127

Abstract

Coexpression of the human glucocorticosteroid receptor (hGR) and chicken 90-kDa heat shock protein alpha (chsp90) in recombinant baculovirus-infected Sf9 cells is a system that provides a large quantity of wild-type chsp90-hGR complexes able to bind hormone ([3H]triamcinolone acetonide; TA), sedimenting at 8 S, and displaceable to 11 S by BF4 and D7 alpha anti-chsp90 monoclonal antibodies. Thus, we were able to examine the effects of selective chsp90 mutations on hetero-oligomeric complex formation. Two deletions involved hydrophilic regions, A between amino acids 221 and 290 and B between amino acids 530 and 581, and the third, Z, removed a central leucine heptad repeat region (amino acids 392-419). When these chsp90 mutants were expressed, the lack of displacement of [3H]TA receptor complexes on sucrose gradient by specific chsp90 antibodies was consistent with the formation of [3H]TA receptor complexes containing only endogenous insect hsp90. By using an immunoadsorption method and sedimentation analysis, we found that the deletion of region A precluded the interaction of chsp90 with the hGR, while B and Z deletions led to formation of abnormal complexes with the hGR, which displayed large forms (> 10 S), were unable to bind hormone, and apparently formed only small amounts of tightly bound nuclei hGR upon in vivo hormone treatment. As a whole, the data are consistent with distinct roles of hsp90 regions in hGR function.

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Selected References

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