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. 1987 Sep 25;15(18):7381–7394. doi: 10.1093/nar/15.18.7381

Transcription initiation and RNA processing of a yeast mitochondrial tRNA gene cluster.

R Bordonné 1, G Dirheimer 1, R P Martin 1
PMCID: PMC306255  PMID: 3309893

Abstract

Expression of 5 yeast mitochondrial tRNA genes (Ala, Ile, Tyr, Asn and Metm), localized upstream from the oxil gene has been analyzed by in vitro capping using guanylyltransferase, northern hybridization and S1 nuclease mapping in the wild type and a rho-strain. The 5 tRNA sequences belong to the same transcriptional unit which is initiated 133 bp upstream from the tRNA(Ala) gene at a promoter sequence TTATAAGTA. Furthermore, a truncated tRNA(Tyr) transcript, 2 nucleotides shorter than mature tRNA(Tyr) has been found, only in the rho-strain. This minor transcript may result from secondary transcription initiation at a variant nonanucleotide sequence, ATATAAGGA, which overlaps the tRNA(Tyr) coding sequence by 3 nucleotides. The polycistronic precursor has proven to be useful in investigation of the mechanisms of tRNA processing. Maturation of this primary transcript proceeds exclusively by precise endonucleolytic cleavages at the 5' and 3'-ends of tRNA sequences.

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