transcriptional repressor ([SW|Xre family]), controls expression of genes of the mobile genetic element ICEBs1, induction by the SOS response or the [[protein|A208B4564A50D7BE2630DE40E8FAAF3C16236EE4]]-[[protein|F3E14B772A5DA9073ED806A9ADDD9B64F0DFDD5B]] sensory system