TABLE 1.

Kinetic parameters of the P_exsC and P_exsD promoters

Promoter	τ(s)a	k2 (s−1, 103)b	KB (M−1, 10−5)c	k2KB (M−1 s−1, 10−3)d
PexsC
Without ExsAHis	13.8	72	1.3	9.4
With ExsAHis	8.1	123	10	123
PexsD
Without ExsAHis	52.7	18.9	3.4	6.4
With ExsAHis	22.6	44	16.5	72.6

^aLag time to open complex formation.

^bIsomerization rate constant.

^cEquilibrium binding constant for RNAP.

^dOverall reaction rate for open complex formation.