Abstract
In an attempt to identify new nuclear genes involved in the synthesis and processing of mitochondrial tRNAs, we utilized a multicopy nuclear library to suppress the heat-sensitive phenotype of a Saccharomyces cerevisiae mitochondrial mutant strain. This strain (Ts 932) is defective in the 3'-end processing of the mitochondrial tRNAAsp transcript. The nuclear genes coding for the mitochondrial elongation factor Tuf M and for the mitochondrial aspartyl-tRNA synthetase have been found to restore the temperature-resistant phenotype and to correct the RNA processing defect. Suppression was effective even when the genes were present on a centromeric plasmid.
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