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J. Biol. Chem., Vol. 265, Issue 27, 16216-16220, 09, 1990
M Aebi, G Kirchner, JY Chen, U Vijayraghavan, A Jacobson, NC Martin and J Abelson
California Institute of Technology, Division of Biology, Pasadena 91125.
We have isolated a yeast mutant, ts352, that is temperature-sensitive for growth. The mutation has a general effect on mRNA metabolism and a specific effect on tRNA biosynthesis. Cells shifted to the nonpermissive temperature accumulate tRNAs that are shorter than mature tRNAs. The increased ability of these tRNAs to accept ATP demonstrates that growth of the ts352 mutant at the nonpermissive temperature results in accumulation of tRNA with defective 3' ends. The activity of ATP (CTP):tRNA-specific tRNA nucleotidyltransferase can readily be measured in extracts from wild type but not mutant cells. We have cloned and sequenced the wild type allele of the ts352 gene and find significant similarity between the yeast protein sequence predicted from the DNA sequence and the protein predicted from the sequence of the Escherichi coli tRNA nucleotidyltransferase gene. Expression of the yeast gene on a multicopy plasmid increases the activity of the tRNA nucleotidyltransferase in extracts. We conclude that the defect in the ts352 mutant is in the gene coding for yeast tRNA nucleotidyltransferase and that we have isolated the yeast gene that codes for this enzyme.
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