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• W1542844327 abstract "We present here a detailed analysis of the effect of amino acid starvation and the addition of cycloheximide on RNA metabolism of yeast cells and spheroplasts. These effects have been studied at the level of uridine phosphorylation, methylation of rRNA, and biosynthesis of 35 S, 4 S, and 5 S RNA species. Amino acid starvation inhibits the phosphorylation of uridine assigned for RNA synthesis more than that for other metabolic processes. This implies that a salvage pathway for the synthesis of UMP and CMP is regulated by the rate of transcription and perhaps is localized in the nucleus. The rate of rRNA methylation is not coupled with the rate of transcription; therefore, quantitation of 35 S RNA synthesis (yeast rRNA primary transcript by [methyl-3H]methionine labeling is unreliable. Biosynthesis of 35 S RNA ceases immediately after the cells are transferred to an amino-acid-deficient medium; at a later time 4 S and 5 S RNAs are also inhibited. Therefore, coordination and noncoordination in the stringent response of these RNA species depend upon the time of starvation. Although addition of a small dose (less than 1.0 microgram/ml) of cycloheximide to starved yeast spheroplasts does not alter the rate of uridine phosphorylation, it increases the rate of entrance of uridine into total RNA. This effect is of greater magnitude in 4 S and 5 S than in 35 S RNA. Since the drug does not alter the rate of decay of 35 S RNA that takes place in starvation, it has a selective effect on transcription. A similar small dose, however, produces inhibition of transcription of all these RNA species in nonstarved conditions. This opposite effect of the drug appears to be a characteristic feature of RNA metabolism in eukaryotes." @default.
• W1542844327 created "2016-06-24" @default.
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• W1542844327 date "1980-03-01" @default.
• W1542844327 modified "2023-09-30" @default.
• W1542844327 title "The stringent and relaxed phenomena in Saccharomyces cerevisiae." @default.
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• W1542844327 doi "https://doi.org/10.1016/s0021-9258(19)86064-7" @default.
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