A role of ygfZ in the Escherichia coli response to plumbagin challenge

Table 2 Growth inhibitory effect of plumbagin against different E. coli mutants

Strain tested	Relative sensitivity to plumbagin at different amounts*
	20 μg	50 μg	100 μg
WT, ΔmdaB, ΔnfnB, Δnfo, ΔyggX or ΔmarA	-	-	-
ΔsoxR, ΔsoxS, or ΔahpC	-	-	+
ΔsodA	+	++	++
ΔygfZ	+	++	+++

* Bacteria were plated on MH agar plates with plumbagin absorbed on an 8-mm filter paper disc.
-: inhibition zone < 15 mm; +: 15 mm < inhibition zone < 25 mm; ++: 25 mm < inhibition zone < 35 mm; +++: inhibition zone > 35 mm

ISSN: 1423-0127