Nitrofurantoin causes the stringent response in After exposure of a stringent strain to this drug, the intracellular concentrations of guanosine 3′-diphosphate 5′-diphosphate (ppGpp), guanosine 3′-diphosphate 5′-triphosphate (pppGpp) and ATP increased, while that of GTP decreased. In a relaxed strain no accumulation of ppGpp or pppGpp was observed, but both GTP and ATP declined after the addition of nitrofurantoin. Protein synthesis was equally sensitive to nitrofurantoin in both the stringent and relaxed strains, but the drug inhibited RNA accumulation only in the stringent strain, not in the relaxed strain. Nitrofurantoin also caused the accumulation of ppGpp in and


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