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Nucleic Acids Research, 1984, Vol. 12, No. 19 7317-7326
© 1984

MOLECULAR BIOLOGY

Initiation of transcription of a mitochondrial tRNA gene duster in S.cerevisiae

C. Palleschi, S. Francisci, M.M. Bianchi and L. Frontali

Department of Cell and Developmental Biology, University of Rome I Rome, Italy

Received July 31, 1984. Accepted September 17, 1984.

In Saccharomyces cerevisiae most mitochondrial tRNA genes are custe red in a 9 kbp region between the cap and oxil genes. Polygenic transcripts of this region have been previously identified. A transcriptional initiation site at a TTATAAGTA box, located upstream from the tRNAcys gene, has now been detected by S1 mapping experiments and by the capping of primary tran scripts. Results are consistent with the hypothesis that this box represents the initiation site for transcription of a cluster of tRNA genes, while the adjacent Formula is cotranscribed with the 21S rRNA. Results obtained with various strains are compared, and the efficiency of this sequence as a tran scriptional initiation site in different mitochondrial contexts is discussed.


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