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The expression of phenomena associated with the bacterial function controlling RNA synthesis was studied in leucine-deprived or 5-methyltryptophan-treated cultures of Anacystis nidulans. Both procedures retarded cell growth, RNA and protein accumulation, elicited the accumulation of high intracellular concentrations of guanosine 5'-diphosphate-3'-diphosphate(ppGpp)and guanosine5'-triphosphate-3'-diphosphate(pppGpp),and promoted a regime of non-coordinate synthesis of stable and messenger RNA. The rate of polymerization of nascent RNA chains did not appear to be retarded in the growth-limited cultures.

The Regulation of Stable RNA Synthesis in the Blue-green Alga Anacystis nidulans: Effect of Leucine Deprivation and 5-Methyltryptophan Inhibition