Strain Table.

aLesions identified in this work are bold.bUridine as sole nitrogen source, glycerol as carbon source.cParental lesion.dInsertion in the lon promoter. The orientation of insL in IS186 is indicated relative to the numbering system of MG1655.eGrowth on 0.5 mM NH4Cl as nitrogen source at pH 5.5. Glucose was the carbon source.fLesion in the nemR promoter.gLesion disrupts a bp in stem of the sroG riboswitch; hereafter designated sroGm1.hAlso called glnL in E. coli.