Fig. 6
Proposed model of Pho regulon expression control. a Activation of the Pho regulon during Pi limitation. b Partial deactivation of the Pho regulon during Pi limitation in the presence of AICAR. PhoR histidine kinase, PhoB response regulator, PstSCAB phosphate-specific ABC transporter, PhoU negative regulator of PhoR, AICAR 5-aminoimidazole-4-carboxamide ribonucleotide, P i inorganic phosphate