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. 1986 Dec 20;5(13):3637–3641. doi: 10.1002/j.1460-2075.1986.tb04693.x

At least two nuclear gene products are specifically required for translation of a single yeast mitochondrial mRNA.

M C Costanzo, E C Seaver, T D Fox
PMCID: PMC1167404  PMID: 3030734

Abstract

Mitochondrial translation of the oxi2 mRNA, encoding yeast cytochrome c oxidase subunit III (coxIII), has previously been shown to specifically require the mitochondrially located protein product of the nuclear gene PET494. We show here that this specific translational activation involves at least one other newly identified gene termed PET54. Mutations in PET54 cause an absence of the coxIII protein despite the presence of normal levels of its mRNA. pet494 mutations are known to be suppressible by mitochondrial gene rearrangements that replace the normal 5'-untranslated leader of the oxi2 mRNA with the leaders of other mitochondrial mRNAs. In this study we show that pet54, pet494 double mutants are suppressed by the same mitochondrial gene rearrangements, showing that the PET54 product is specifically required, in addition to the PET494 protein, for translation of the oxi2 mRNA. Since, as we show here, PET54 is not an activator of PET494 gene expression, our results suggest that the products of both of these genes may act together to stimulate coxIII translation.

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