Abstract

A malfunction in the yeast HAC1 causes the unfolding-protein response in the endoplasmic reticulum, resulting in stress-sensitive and inositol auxotrophic phenotypes. Chaperonin-containing TCP1 (CCT) is necessary for the folding of actin and tubulin in the cytosol. The introduction of the truncated human CCT epsilon subunit into yeast cells of which hac1 was disrupted clearly suppressed not only its inositol auxotrophic phenotype but also its stress-sensitive phenotype.

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