This domain is found in a variety of bacterial transcriptional regulators. The domain binds to a specific DNA sequence pattern (see [1]).

1: A novel type of conserved DNA-binding domain in the transcriptional regulators of the AlgR/AgrA/LytR family. Nikolskaya AN, Galperin MY; Nucleic Acids Res 2002;30:2453-2459. PMID:12034833