<p>This is the DNA binding domain of the LexA SOS regulonrepressor which prevents expression of DNA repair proteins in bacteria.The aligned region contains a variant form of the helix-turn-helix DNAbinding motif [<cite idref="PUB00001262"/>].This domain usually at the N terminus is found associated with <db_xref db="INTERPRO" dbkey="IPR006198"/> the auto-proteolytic domain of LexA <db_xref db="EC" dbkey="3.4.21.88"/>.</p> LexA, DNA-binding domain