TABLE 1.

Salmonella strains and plasmids used in this study

Strain or plasmid	Characteristic	Origin or reference
S. enterica serovar Typhimurium
14028s	Wild type	ATCCa
14028ΔramA	ramA null mutant	10
E. coli
MC1061	Wild type	ATCC
AG100	Wild type	6
AG100kana	ΔmarA	6
Plasmids
pBluescript	Cloning vector	Stratagene
pB1-ramA	Constitutive RamA expression	10
pTrcHisA	IPTG-inducible plasmid	Invitrogen
pTrcHisA-ramA	Inducible RamA expression	10

^aATCC, American Type Culture Collection.