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. 1986 Dec 22;14(24):9561–9578. doi: 10.1093/nar/14.24.9561

Sequence and expression of four mutant aspartic acid tRNA genes from the mitochondria of Saccharomyces cerevisiae.

D Najarian, H H Shu, N C Martin
PMCID: PMC341321  PMID: 3543841

Abstract

Expression of the mitochondrial tRNAAsp gene of Saccharomyces cerevisiae has been examined in five syn- mutants known to affect tRNAAsp function, and in a rho- mutant which accumulates precursor tRNAs. By comparison of wild-type versus mutant DNA sequence, the lesion in each syn- mutant has been identified as a single base change within the mitochondrial tRNAAsp structural gene. The mutant tRNAAsp genes are transcribed, and the transcripts can be processed to mature 4S-size tRNAAsp. The steady-state level of each mutant tRNAAsp is lower than that of wild-type tRNAAsp. The RNA from two of the syn- mutants contained a second, slow-migrating form of mitochondrial tRNAAsp which is correctly processed at the 5' end. We conclude that the lesions in the syn- mitochondrial tRNAAsp genes block neither transcription of these genes, nor 5'-end processing of the transcripts. The effect of each point mutation must be manifested at the level of 3'-end processing, or at a functional level.

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