Table 1.

Bacterial strains and plasmids used in the study

Strain or plasmids		Genotype and relevant characteristics	Reference
Salmonella strains
C5		S. Typhimurium, virulent wild type	[38]
clpP	LT1100	C5 ΔclpP	[39]
clpP +	LT1102	LT1100 with Tn10 linked to clpP+ (linkage 48%)	[39]
clpP/rpoS	LT1104	LT1100 rpoS::Ap	[39]
rpoS	LT1105	C5 rpoS::Ap	[39]
clpP + /rpoS	LT1108	LT1102 rpoS::Ap	[39]
csrA (sup)	GMK201	C5 csrA::Kn sup, suppressor of csrA growth defect	[13]
rpoS/csrA (sup)	GMK206	LT1105 csrA::Kn, sup, suppressor of csrA growth defect	[13]
clpP/rpoS/csrA (sup)	GMK207	LT1104 csrA::Kn, sup, suppressor of csrA growth defect	[13]
csrA+ (sup)	GMK209	GMK201 with plasmid pCA132	[13]
Plasmids
pCA132		0.7-kb csrA fragment on pFF584; Strr Spr	[30]