TABLE 5.

MICs (μg ml^–1) to TMP in different strains of E. coli K-12 W3110.

Strain	Description	MIC
W3110	E. coli W3110	0.16
W3110 ΔmgrB	E. coli W3110 ΔmgrB	1.28
W3110 ΔmgrB ΔPphoP:PphoP	E. coli W3110 ΔmgrB replacing the promoter region of folA in the chromosome with the wild type promoter of folA	1.28
W3110 ΔmgrB ΔPphoP: dm-PphoP	E. coli W3110 ΔmgrB replacing the promoter region of folA in the chromosome with the deletion mutated promoter of folA	0.64

Cultures were incubated overnight at 37°C on LB.