yciF was initially identified by a screen for RpoSregulated genes and a putative RpoS-dependent promoter has been located upstream of yciG [ 39 ] .
Because yciF was identified in a screen for RpoSregulated genes , we examined transcription of yciG : : luc with and without RpoS to determine if activation of yciGFE-katN by bile was dependent upon RpoS .
Among other genes with significantly reduced expression in LP strains , yeaG , yncC , rpsV , osmE , yiaG , otsA , fbaB , talA , poxB , yehY , dps , sodC , katE , bfr , yciF are regulated by the alternative sigma factor RpoS .