Characterization of multiple members of the HSP70 family in platyfish culture cells: molecular evolution of stress protein HSP70 in vertebrates

Gene
Michiaki YamashitaKazuhiro Nagata

Abstract

A shift from 28 to 37 degrees C in the incubation temperature of a culture of the platyfish fibroblast cell line, EHS cells (platyfish fibroblast cell line), induced a set of stress proteins. A two-dimensional polyacrylamide gel electrophoresis (2D-PAGE) analysis showed that the cells expressed three genetically distinct forms of heat-shock protein 70 (HSP70) family proteins: heat-inducible forms of HSP70, the constitutively expressed heat-shock cognate protein 70 (HSC70) and its phosphorylated isoform, and the glucose-regulated protein 78 (GRP78). Three different clones encoding two major isoforms of heat-inducible HSP70, platyfish HSP70-1 and HSP70-2, and of the HSC70 were isolated from a platyfish cDNA library. We compared the deduced amino acid sequences of the platyfish HSP70 and HSC70 proteins with those of other vertebrates. Phylogenetic analysis showed that vertebrate HSP70 could be classified into four cluster groups: (a) fish HSP70, with two isoforms of heat-inducible HSP70 in fish, fish HSP70-1 and HSP70-2; (b) the mammalian testis-specific HSP70-related protein HST70; (c) the mammalian heat-inducible HSP70B'; and (d) the mammalian major histocompatibility complex (MHC)-linked HSP70, including the MHC-linked heat-ind...Continue Reading

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Mar 19, 2008·Cell Stress & Chaperones·Melody S ClarkLloyd S Peck
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