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• W2013150521 abstract "The base at the first anticodon (wobble) position of certain eukaryotic tRNA species is either guanine or the hypermodified base queuine. These tRNA species are synthesized with guanine in the wobble position (tRNAG); this guanine can then be replaced with queuine by the action of the enzyme tRNA-guanine ribosyltransferase. In the present report, we show that tRNAG levels increased in response to the induction of erythroid differentiation of murine erythroleukemia (MEL) cells. We also found that tRNA-guanine ribosyltransferase was significantly inhibited by tetrahydrobiopterin. MEL cells showed a transient threefold increase in tetrahydrobiopterin levels 6 to 12 h after exposure of the cells to inducers such as DMSO or tetramethylurea. The increase in tetrahydrobiopterin preceded the increase in tRNAG which in turn preceded the appearance of phenotypic changes characteristic of differentiation. By contrast, a mutant MEL cell line unable to differentiate in response to inducers showed no change in the level of tetrahydrobiopterin or of tRNAG upon exposure to DMSO. N-acetylserotonin, a well-characterized inhibitor of tetrahydrobiopterin synthesis, prevented the DMSO-mediated increase in tetrahydrobiopterin in normal MEL cells. N-acetylserotonin also inhibited the increase in tRNAG levels and the appearance of phenotypic differentiation in these cells." @default.
• W2013150521 created "2016-06-24" @default.
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• W2013150521 date "1991-07-01" @default.
• W2013150521 modified "2023-09-27" @default.
• W2013150521 title "Alterations in cell tetrahydrobiopterin levels may regulate queuine hypomodification of tRNA during differentiation of murine erythroleukemia cells" @default.
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• W2013150521 doi "https://doi.org/10.1016/0014-4827(91)90506-p" @default.
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