TABLE 1.

Strains used in this study

Strain(s)	Genotype	Note(s)	Reference
BW25113	Δ(araD-araB)567 ΔlacZ4787(::rrnB-3) λ− rph-1 Δ(rhaD-rhaB)568 hsdR514		54
GS325	BW25113 proA* argC::kan; hemL allele encoding G277S HemL	Contains unexpected mutation in hemL
JK290	BW25113 argC::kan		54
JK293a and JK293b	BW25113 proA* argC::kan	2 isolates obtained from JK290 by gene gorging	This work
JK306	JK293a(G259542A)	Contains M1 (−30G→A) in −35 region of proBA promoter	This work
JK311	JK293a(C259567T)	Contains M2 (−5C→T) in −10 region of proBA promoter	This work
JK313a and JK313b	JK293a(A260655T)	2 isolates in which M3 (1044A→T) was inserted in proB in JK293a	This work