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Cellular and Molecular Biology Letters

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The effect of calnexin deletion on the expression level of PDI in Saccharomyces cerevisiae under heat stress conditions

1Liaoning University

2Yamaguchi University

© 2007 Versita Warsaw. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. (CC BY-NC-ND 3.0)

Citation Information: Cellular and Molecular Biology Letters. Volume 13, Issue 1, Pages 38–48, ISSN (Online) 1689-1392, DOI: 10.2478/s11658-007-0033-y, October 2007

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We cultured calnexin-disrupted and wild-type Saccharomyces cerevisiae strains under conditions of heat stress. The growth rate of the calnexin-disrupted yeast was almost the same as that of the wild-type yeast under those conditions. However, the induced mRNA level of the molecular chaperone PDI in the ER was clearly higher in calnexin-disrupted S. cerevisiae relative to the wild type at 37°C, despite being almost the same in the two strains under normal conditions. The western blotting analysis for PDI protein expression in the ER yielded results that show a parallel in their mRNA levels in the two strains. We suggest that PDI may interact with calnexin under heat stress conditions, and that the induction of PDI in the ER can recover part of the function of calnexin in calnexin-disrupted yeast, and result in the same growth rate as in wild-type yeast.

Keywords: Calnexin; Molecular chaperone; PDI; Heat stress

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