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Copper resistance in the budding yeast Saccharomyces cerevisiae is primarily mediated by the tandemly arrayed metallothionein gene CUP1. We analyzed eight isogenic strains harboring CUP1 arrays of var...ying lengths, including those artificially expanded beyond their natural ranges. CUP1 mRNA levels and copper resistance increased with copy number before reaching a plateau. Increased dosage of the transcriptional activator Cup2 partially mitigated the plateaued resistance in strains with intermediate, but not high, copy numbers. These findings indicate that CUP1 confers resistance dose-dependently until transcriptional capacity becomes limiting, suggesting a possible strategy for engineering extreme copper resistance.続きを見る
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