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The Arc (anoxic redox control) two-component system of Escherichia coli, comprising ArcA as the response regulator and ArcB as the sensor histidine kinase, modulates the expression of numerous genes in response to respiratory growth conditions. Under reducing growth conditions, ArcB autophosphorylates at the expense of ATP, and transphosphorylates ArcA via a His 292 3 Asp 576 3 His 717 3 Asp 54 phosphorelay, whereas under oxidizing growth conditions, ArcB catalyzes the dephosphorylation ofdoi:10.1074/jbc.ra118.003910 pmid:29945971 fatcat:4xagycdbifbidaiwli3mppytta