Transcriptional activator that binds specifically to the DNA sequence 5'-[AG]GATT-3'. Binds the target DNA as a monomer. May be due to a competing donor splice site. Belongs to the ARR-like family. Lacks the phospho-accepting Asp (here Glu-76), present in the receiver domain, which is one of the conserved features of the two-component response regulators (ARRs) family.