Table 1.

Comparison of in vivo concentrations of MarA required for half-maximal activity of 10 regulon promoters and the in vitro dissociation constants of MarA and the 20 bp promoter marbox sequences

Promoter	MarA (µM)a	KD (µM)b
marRAB	1.5	0.075
sodA	13	>1
micF	17	0.05
mdaB	~25	NDc
ybjC	~25	0.32
fumC	>28	0.32
inaA	>28	0.5
tolC	>28	0.8
yhbW	>28	ND
zwf	>28	>1

^aIn vivo concentration of MarA providing half-maximal activation of the indicated promoter was calculated from Fig. 1 and Fig. 2 and assumes that the internal volume of an E. coli cell is ~10⁻¹⁵ liters.

^bIn vitro dissociation constants from references 9 and 12.

^cND, not done.