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. 1994 Aug 11;22(15):3124–3130. doi: 10.1093/nar/22.15.3124

Suppression of the serT42 mutation with modified tRNA(1Ser) and tRNA(5Ser) genes.

Y Yamada 1, H Ishikura 1
PMCID: PMC310285  PMID: 8065926

Abstract

Serine tRNA gene derivatives with altered anticodons were introduced to the temperature-sensitive serT42 mutant, whose tRNA(1Ser) shows a base substitution of A10 for wild type G10. When a low copy number vector-system was used, the growth and beta-galactosidase synthetic activity of the serT42 mutant were restored by complementation with the tRNA(5Ser) (T34) gene or the tRNA(1Ser) (G34) gene as well as the tRNA(1Ser) (wt) gene, but not with tRNA(5Ser) (wt), tRNA(1Ser) (A34) or tRNA(1Ser) (C34) genes at 42 degrees C. When multicopy vectors were used, the transformation even with tRNA(1Ser) (A10) gene restored the growth and beta-galactosidase synthetic activity at 42 degrees C. The tRNA(1Ser) (A10) showed no thermosensitivity in serine acceptor activity by in vitro assay. At 42 degrees C, the amount of tRNA(1Ser) (A10) in the serT42 mutant was almost the same as those in the wild type. The nucleotides in the tRNA(1Ser) (A10) were found to be fully modified like those in the wild type tRNA(1Ser). Both of the tRNAs transcribed from tRNA(5Ser) (T34) and tRNA(1Ser) (G34) genes showed serine acceptor activity. Modified nucleosides of these tRNAs were also analyzed.

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Selected References

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