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Mol Cell Biol. 1986 April; 6(4): 1187-1203

Expression and localization of Drosophila melanogaster hsp70 cognate proteins.

K B Palter, M Watanabe, L Stinson, A P Mahowald and E A Craig

ABSTRACT

Monoclonal antibodies have been used to identify three proteins in Drosophila melanogaster that share antigenic determinants with the major heat shock proteins hsp70 and hsp68. While two of the proteins are major proteins at all developmental stages, one heat shock cognate protein, hsc70, is especially enriched in embryos. hsc70 is shown to be the product of a previously identified gene, Hsc4. We have examined the levels of hsp70-related proteins in adult flies and larvae during heat shock and recovery. At maximal induction in vivo, hsp70 and hsp68 never reach the basal levels of the major heat shock cognate proteins. Monoclonal antibodies to hsc70 have been used to localize it to a meshwork of cytoplasmic fibers that are heavily concentrated around the nucleus.

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Mol Cell Biol. 1986 April; 6(4): 1187-1203

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