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- W4247489906 abstract "Nuclear export of tRNA in Saccharomyces cerevisiae involves Los1p and Arc1p. Los1p facilitates tRNA translocation across the nuclear pore complex whereas Arc1p plays a role in delivering some species of tRNA exiting the nucleus to their cognate aminoacyl-tRNA synthetases. Here, we show that mutations of C11 and G24 of the D-stem of the yeast tyrosine amber-suppressor tRNA have different effects on nuclear export of the tRNA. Changing G24 had no effect on export of the tRNA to the cytoplasm. In contrast, mutating C11 resulted in nuclear retention of the tRNA. Nuclear retention of the tRNA mutants was not due to lack of processing, since only the mature forms of the tRNA mutants were found. The fact that mutations of G24 did not affect export of the tRNA also indicates that the effect of mutating C11 is not due to gross alteration of the tertiary structure resulting from disruption of the C11/G24 base pair. Expression of Los1p and the mammalian tRNA export receptor exportin-t rescued nuclear export of the tRNA with changes at position 11. The export-defective mutations of the tRNA mutants were suppressed by introducing the complementary nucleotides at position 24. Taken together, these findings suggest that C11 is important for binding of the tRNA to the export receptor, and that this binding is influenced by the conformation of the base. Finally, the export-defective tRNA mutants described can be used as reporters to identify eukaryotic proteins involved in the nuclear-tRNA export process, and characterize the molecular interactions between known receptors and the tRNA substrate." @default.
- W4247489906 created "2022-05-12" @default.
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- W4247489906 date "2000-04-01" @default.
- W4247489906 modified "2023-09-25" @default.
- W4247489906 title "Nucleotides of the tRNA D-stem that play an important role in nuclear-tRNA export in Saccharomyces cerevisiae" @default.
- W4247489906 doi "https://doi.org/10.1042/0264-6021:3470115" @default.
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