P1 is an RpoS-regulated gearbox promoter located 407 bp upstream of the acnA start codon and is responsible for stationary-phase induction of acnA expression .
E. coli RpoS CRP SoxR FNR Fur acnA P2 P1 S. Typhimurium Expression of S. Typhimurium acnA is regulated by oxR Enhanced expression of the acnA gene in the acnB mutant suggested that PacnA was regulated .