Transcription inhibitory protein for the torCAD operon. Also acts as an excisionase and plays an essential role in the defective prophage CPS53 excision. Interacts with TorR. Binds to the effector domain of TorR. This interaction, which does not interfere with TorR DNA binding activity, probably prevents the recruitment of RNA polymerase to the torCAD promoter. Binds to DNA. Belongs to the phage AlpA excisionase family.