Member of the two-component regulatory system BasS/BasR. Autophosphorylates and activates BasR by phosphorylation. Plays a role in the adaptation of the organism to the host environment, in particular to neutrophils, and therefore it plays a role in virulence as well. ATP + protein L-histidine = ADP + protein N-phospho-L-histidine. The eptA-basRS operon is positively autoregulated by BasR under high iron or aluminum concentration conditions. Autophosphorylated.