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• W1919156792 startingPage "989" @default.
• W1919156792 abstract "Two isoforms of the 90-kDa heat shock protein, HSP90α and HSP90β, are present in the cytosol of mammalian cells. Analysis by polyacrylamide gel electrophoresis under nondenaturing conditions (native PAGE) revealed that HSP90α predominantly exists as a homodimer and that HSP90β is present mainly as a monomer [Minami, Kawasaki, Miyata, Suzuki and Yahara (1991) J. Biol. Chem. 266, 10099-10103]. However, only the dimeric form has been observed under other analytical conditions such as gradient centrifugation. In this study, therefore, we investigated native forms of HSP90 by use of immunochemical techniques with isoform-specific monoclonal antibodies recently developed in our laboratory. Glycerol gradient centrifugation at the physiological salt concentration as well as native PAGE analysis of rat liver cytosol revealed oligomeric forms of HSP90α sedimenting at 8-10S as predominant ones. On the other hand, the glycerol gradient centrifugation revealed multiple forms of HSP90β oligomers sedimenting at 6-12S. All of the HSP90β oligomers, however, migrated at 100-kDa monomer and 190-kDa dimer positions on native PAGE. A novel two-dimensional double native PAGE revealed that the entity was converted from the HSP90β dimer to monomers during the electrophoresis. The same PAGE further revealed that the HSP90α oligomer also dissociated into dimers during the electrophoresis. Full-length form of bacterially-expressed human HSP90α migrated as dimers, but a considerable amount did not penetrate into the gel under native PAGE conditions, indicating the existence of oligomeric forms. Electrophoretic studies of deletion mutants of HSP90 demonstrated that the C-terminal 200 amino acids were capable of forming oligomers. Taken together, we conclude that both of the HSP90 isoforms predominantly exist as oligomeric forms in the cytosol even under unstressed conditions but that they artificially dissociate into smaller forms when subjected to native PAGE." @default.
• W1919156792 created "2016-06-24" @default.
• W1919156792 creator A5028408891 @default.
• W1919156792 creator A5060865292 @default.
• W1919156792 date "1998-03-01" @default.
• W1919156792 modified "2023-09-24" @default.
• W1919156792 title "Oligomeric forms of the 90-kDa heat shock protein" @default.
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• W1919156792 doi "https://doi.org/10.1042/bj3300989" @default.
• W1919156792 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1219235" @default.
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• W1919156792 hasPublicationYear "1998" @default.
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