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• W2086039118 abstract "To study the role of 5-methylcytidine in the aminoacylation of mammalian tRNA, bulk tRNA specifically deficient in 5-methylcytidine was isolated from the livers of mice treated with 5-azacytidine (18 mg/kg) for 4 days. For comparison, more extensively altered tRNA was isolated from the livers of mice treated with dl-ethionine (100 mg/kg) plus adenine (48 mg/kg) for 3 days. The amino acid acceptor capacity of these tRNAs was determined by measuring the incorporation of one of eight different 14C-labeled amino acids or a mixture of 14C-labeled amino acids in homologous assays using a crude synthetase preparation isolated from untreated mice. The 5-methylcytidine-deficient tRNA incorporated each amino acid to the same extent as fully methylated tRNA. The tRNA from dl-ethionine-treated livers showed an overall decreased amino-acylation capacity for all amino acids tested. The 5-methylcytidine-deficient tRNA from 5-azacytidine-treated mice and the more altered tRNA from dl-ethionine-treated mice were further characterized as substrates in homologous rate assays designed to determine the Km and V of the aminoacylation reaction using four individual 14C-labeled amino acids and a mixture of 14C-labeled amino acids. The Km and V of the reactions for all amino acids tested using 5-methylcytidine-deficient tRNA as substrate were essentially the same as for fully methylated tRNA. However, the Km and V were increased when liver tRNA from mice treated with dl-ethionine plus adenine was used as substrate in the rate reaction with [14C]lysine as label. Our results suggest that although extensively altered tRNA is a poorer substrate than control tRNA in both extent and rate of aminoacylation, 5-methylcytidine in mammalian tRNA is not involved in the recognition of the tRNA by the synthetase as measured by aminoacylation activity." @default.
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• W2086039118 date "1978-12-01" @default.
• W2086039118 modified "2023-09-27" @default.
• W2086039118 title "Aminoacylation of undermethylated mammalian transfer RNA" @default.
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• W2086039118 doi "https://doi.org/10.1016/0005-2787(78)90298-8" @default.
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