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In screening for resistance to tannic acid, mutants of Saccharomyces cerevisiae with an altered cell wall composition were recently isolated. Here we show that these mutants were all respiratory deficient. Cytoplasmic petite mutants isolated after ethidium bromide mutagenesis were resistant to tannic acid and had cell wall characteristics similar to the mutants isolated by screening for tannic acid resistance as shown by the lower sensitivity to zymolyase, a cell wall hydrolyzing enzyme, and by a changed sensitivity to calcofluor white, a molecule interfering with the cell wall assembly. Reintroducing active mitochondria to a tannic-acid-resistant mutant reduced the tannic acid resistance and zymolyase resistance to the wild-type level, showing that a mitochondrial mutation was responsible for the changes in cell wall composition and in tannic acid sensitivity.

Impact of mitochondrial activity on the cell wall composition and on the resistance to tannic acid in Saccharomyces cerevisiae.