Abstract
Using monoclonal antibodies directed against different cytoplasmic isoforms of hsp70 proteins, namely, the constitutive hsc73 and the inducible hsp72 isoforms, we found that one isoform related to hsc73 was present in Euglena gracilis. This hsc73-like protein is expressed with a higher rate of synthesis in cells growing under heat shock than in control cells. Moreover, in cadmium-resistant cells, cultured at normal growth temperature, the rate of synthesis of this protein is constitutively increased. These results indicate that a heat-shock protein related to hsc73 is present in an ancestral eukaryote, Euglena gracilis, and that this protein may be constitutive and stress inducible as well.
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