2.7.6.5 | ATP + GTP = AMP + guanosine 3'-diphosphate 5'-triphosphate |
the catalytic pathway of (p)ppGpp synthesis involves a sequentially ordered substrate binding, activation of ATP in a strained conformation, and transfer of diphosphate through a nucleophilic substitution (SN2) reaction. pppGpp, but not ppGpp, positively regulates the enzyme at an allosteric site |
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