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Throughout the bacterial domain, the alarmone ppGpp dramatically reprograms transcription following nutrient limitation. This “stringent response” is critical for survival and antibiotic tolerance and is a model for transcriptional regulation by small ligands. We report that ppGpp binds to two distinct sites 60 Å apart on E. coli RNA polymerase (RNAP), one characterized previously (site 1) and a second...
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