This family represents a conserved region approximately within a number of hypothetical bacterial proteins that may be regulated by SdiA, a member of the LuxR family of transcriptional regulators [1]. Some family members contain the Pfam:PF01436 repeat.

1: Salmonella typhimurium encodes an SdiA homolog, a putative quorum sensor of the LuxR family, that regulates genes on the virulence plasmid. Ahmer BM, van Reeuwijk J, Timmers CD, Valentine PJ, Heffron F; J Bacteriol 1998;180:1185-1193. PMID:9495757