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- W2047035263 abstract "The low-molecular-weight heat-shock protein HSP27 is made in the absence of heat shock during Drosophila melanogaster development. An analysis of the accumulation of HSP27 during specific stages of development is presented using an antiserum recognizing this protein. Whereas HSP27 is abundant during embryogenesis, the level of this protein begins to decrease in the 20-h old embryo and is no longer detectable in second instar larvae. A high level of HSP27 is again observed in third instar larvae and reaches a maximal level in late pupae. While still abundant in young adult flies of both sexes, a greater amount of HSP27 is found in females with the protein being highly concentrated within the ovaries. Following lysis of whole pupae, about 60% of HSP27 is found in the soluble lysate fraction in a form which sediments between 5 and 20S. Anti-HSP27 serum also recognizes three other developmentally regulated polypeptides with apparent MW of 33, 85 and 120 kDa. The 33 kDa protein accumulates in pupae while those of 85 and 120 kDa are more abundant in third instar larvae. Unlike HSP27, these proteins are not detected in embryos or ovaries. Immunoblot analysis of V8 proteolytic fragments suggests that HSP 27 and 33 kDa are related polypeptides. Exposure of the developing insect to heat-shock treatment results in increased level of HSP27. In larvae, a small amount of the 33 kDa protein accumulates following heat shock, while in pupae and adult flies a decrease in the concentration of this protein is observed after heat shock. Finally, different cellular localizations and distributions within the pupal body have been found for these developmentally regulated polypeptides." @default.
- W2047035263 created "2016-06-24" @default.
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- W2047035263 date "1988-03-01" @default.
- W2047035263 modified "2023-09-26" @default.
- W2047035263 title "Characterization of HSP27 and three immunologically related polypeptides during Drosophila development" @default.
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- W2047035263 doi "https://doi.org/10.1016/0014-4827(88)90264-9" @default.
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