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The region distal to the rRNA operon from chloroplasts of maize contains genes coding for tRNAArg(ACG) and tRNAAsn(GUU)

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Summary

The nucleotide sequence distal to the rRNA operon from maize chloroplasts has been analyzed. It contains genes coding for tRNAArg(ACG) and tRNAAsn(GUU). The tRNAArg(ACG) gene, which is separated from the last rRNA gene of the rRNA operon, the 5S rDNA, by an intergenic region of 252 bp, has the same orientation as the rRNA operon. By S1 and primer extension mapping, the existence of transcripts from the entire 5S rDNA/tDNAArg(ACG) intergenic region can be demonstrated. It is, therefore, concluded that tRNAArg(ACG) represents a trailer tRNA which is cotranscribed with 5S rRNA as part of the primary rRNA transcript. The tDNAAsn(GUU), which is separated from tDNAArg(ACG) by an intergenic region of 253 bp, has the opposite orientation with respect to the rRNA operon; it, therefore, represents a separate transcriptional unit whose promoter remains to be located. It is proposed that the two tRNA genes possess a common terminator region, which functions in both directions of transcription.

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This paper is dedicated to Professor Morio Ikehara on the occasion of his retirement from Osaka University in March 1986.

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Dormann-Przybyl, D., Strittmatter, G. & Kössel, H. The region distal to the rRNA operon from chloroplasts of maize contains genes coding for tRNAArg(ACG) and tRNAAsn(GUU). Plant Mol Biol 7, 419–431 (1986). https://doi.org/10.1007/BF00020326

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  • DOI: https://doi.org/10.1007/BF00020326

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