Abstract
The kinetics of ppGpp (guanosine 5′-diphosphate,3′-diphosphate) and pppGpp (guanosine 5′-triphosphate,3′-diphosphate) synthesis, at the onset of amino acid starvation, and of their decay after inhibiting synthesis, were analysed in Escherichia coli. The pentaphosphate, but not ppGpp, is the first product of the stringent response to amino acid starvation. The pentaphosphate is rapidly converted with first order kinetics ( t 1 2 = 6 s ) to ppGpp which is broken down less rapidly ( t 1 2 = 20 s ).
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