Positively regulates the transcription of the embCAB operon. Exhibits ATPase and GTPase activities (By similarity). Contains a N-terminal winged-helix DNA-binding domain and a regulatory C-terminal forkhead-associated (FHA) domain, which mediates binding to a Thr-phosphorylated site in the cognate kinase. Phosphorylated on threonine residue(s). Belongs to the AfsR/DnrI/RedD regulatory family.