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Nucleotide sequence of a tomato mitochondrial tRNA(Cvs) (GCA) gene.

A total tomato DNA library in EMBL3 (1) was screened with the end labeled tomato 4S RNAs to provide a clone TR4 carrying a 12.5 kb insert, which was hybridized to the mitochondrial(mt) genome but not the nuclear and chloro- plast (cp) genomes. In the insert of TR4 a 558 bp HindlII/EcoRI fragment hybridized to the probe was subcloned into M13 mpl8/19 for sequence analysis. DNA sequence revealed that a single tRNA gene was identified and it contains the anticodon GCA corresponding to a cysteine codon. The 3' CCA is not encoded in the gene. This tomato mit tRNA('Ys gene shows 66 and 59% sequence homologies with f,, coli (2) and tobacco cp (3) genes, respectively. So far, a plant mit tRNA ' (GCA) gene has been found in maize, which shows a nearly complete homology with maize cp counterpart (4) but only 58X homology with this tomato gene. The transcript from the tomato mit tRNA ys gene has been detected by Northern analysis (5). This is therefore the first reported sequence of a functional cysteine tRNA gene unique to the plant mit genome.