Mor (Middle operon regulator) is a sequence specific DNA binding protein. It mediates transcription activation through its interactions with the C-terminal domains of the alpha and sigma subunits of bacterial RNA polymerase. The N terminal region of Mor is the dimerisation region, and the C terminal contains a helix-turn-helix motif which binds DNA.

1: Crystal structure of the Mor protein of bacteriophage Mu, a member of the Mor/C family of transcription activators. Kumaraswami M, Howe MM, Park HW; J Biol Chem. 2004;279:16581-16590. PMID:14729670