Table 1.

Strains and Plasmids

Strain	Relevant Genotype	Source/Reference
BW25113	Wild-type, lacIq rrnBT14 ΔlacZWJ16 hsdR514 ΔaraBADAH33 ΔrhaBADLD78	(Datsenko & Wanner, 2000)
E. coli wild-type	BW25113/pBAD24	This work
E. coli ΔcusS	BW25113/ΔcusS::kanR/pBAD24	This work
E. coli ΔcusS ΔcusCFBA	BW25113/ΔcusS ΔcusCFBA/pBAD24	This work
Plasmid
pBAD24	pBR322 ori, BAD promoter, ampR	(Guzman et al., 1995)
pBADcusS	E. coli cusS cloned into pBAD24	This work