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Nucleic Acids Research, 1984, Vol. 12, No. 5 2367-2379
© 1984

MOLECULAR BIOLOGY

A cluster of six tRNA genes in Drosophila mitochondrial DNA that includes a gene for an unusual tRNAserAGY

Douglas O. Clary and David R. Wolstenholme

Department of Biology, University of Utah Salt Lake City, UT 84112, USA

Received November 22, 1983. Accepted February 1, 1984.

Genes for URF3, tRNAala, tRNAarg, tRNAasn tRNAserAGY, tRNAglu, tRNAphe, and the carboxyl terminal segment of the URF5 gene have been identified within a sequenced segment of the mtDNA molecule of Drosophila yakuba The genes occur in the order given. The URF5 and tRNAphe genes are transcribed in the same direction as replication while the URF3 and remaining five tRNA genes are transcribed in the opposite direction. Considerable differences exist in the relative arrangement of these genes in D. yakuba and mammalian mtDNA molecules. In the tRNAserAGY gene an eleven nucleotide loop, within which secondary structure formation seems unlikely, replaces the dihydrouridine arm, and both the variable loop (six nucleotides) and the TYC loop (nine nucleotides) are larger than in any other D yakuba tRNA gene. As available evidence is consistent with AGA codons specifying serine rather than arginine in the Drosophila mitochondrial genetic code, the possibility is considered that the 5'GCU anticodon of the D. yakuba tRNAserAGY gene can recognize AGA as well as AGY codons.


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