Chemotactic-signal transducers respond to changes in the concentration of attractants and repellents in the environment, transduce a signal from the outside to the inside of the cell, and facilitate sensory adaptation through the variation of the level of methylation. Chemoreceptor for inorganic phosphate, which is required for taxis at low concentrations of phosphate. Is also responsible for the positive chemotaxis toward 4-chloroaniline (4CA) and catechol (PubMed:10852870, PubMed:24038698). Does not recognize inorganic phosphate directly, but via a complex between the periplasmic protein PstS and inorganic phosphate (PubMed:27353565). Induced by phosphate limitation, via the PhoR/PhoB two-component regulatory system. Repressed by PhoU under conditions of phosphate excess. Belongs to the methyl-accepting chemotaxis (MCP) protein family.