Positively regulates the transcription of the embCAB operon. Exhibits ATPase and GTPase activities. Interacts with RNA polymerase (PubMed:16817899). Co-immunoprecipitates with DarG in the presence and absence of darT (PubMed:32634279). 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) by PknH, PknA and PknB. Phosphorylation enhances the DNA-binding activity of EmbR. Dephosphorylated by PstP. Belongs to the AfsR/DnrI/RedD regulatory family.