This family includes LftS, a soluble globular cytoplasmic protein of unknown function. It is suggested that LftS acts in aurantimycin A sensing or in removal of LftR from its operator sites.

1: Aurantimycin resistance genes contribute to survival of Listeria monocytogenes during life in the environment. Hauf S, Herrmann J, Miethke M, Gibhardt J, Commichau FM, Muller R, Fuchs S, Halbedel S; Mol Microbiol. 2019;111:1009-1024. PMID:30648305