In complex with DhaQ, upon activation by dihydroxyacetone, activates transcription of the dhaKLM operon. Binds the inverted repeat sequence 5'-GGACACATN(6)ATTTGTCC-3' located upstream of and partially overlapping with the -35 promoter sequence of the dhaKLM operon promoter. Homodimer. Interacts with a homodimer of DhaQ.