However , at 30 ∞ C , SdiA activates srgE regardless of the presence of AHLs .
In response to AHLs , SdiA activates two Salmonella-specific loci , srgE
In response to AHL under laboratory conditions , Salmonella SdiA activates the expression of the chromosomally encoded srgE gene .
SdiA upregulates two loci in S. Typhimu-rium , resistance to complement killing operon , located on the Salmonella virulence plasmid , and srgE -LRB- sdiA-regulated gene -RRB- , a horizontally acquired gene located on the chromosome .
as was the case for sdiA , suggesting that there was sufficient SdiA to activate srgE