Bifunctional (p)ppGpp synthase/hydrolase RelA

UniProtKB accession:  Q54089

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UniProtKB description:  In eubacteria ppGpp (guanosine 3'-diphosphate 5'-diphosphate) is a mediator of the stringent response that coordinates a variety of cellular activities in response to changes in nutritional abundance. This enzyme catalyzes both the formation of pppGpp which is then hydrolyzed to form ppGpp, and the hydrolysis of ppGpp. The enzyme does not simultaneously display both synthase and hydrolase activities. In the structure of residues 1-385 there are 2 conformations seen, the hydrolase-OFF/synthase-ON and hydrolase-ON/synthase-OFF, suggesting there is ligand-induced signal transmission between the 2 active sites.