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 high concentrations of phosphate (PubMed:10852870). Recognizes inorganic phosphate directly. Can also bind to other components that have a pyrophosphate group, including ATP and ADP (PubMed:27353565). Constitutively expressed. Binding to inorganic phosphate induces dimerization and stabilization of the ligand binding domain. Belongs to the methyl-accepting chemotaxis (MCP) protein family.