TABLE 3.

Canonical SOS boxes located outside putative promoter regions

Gene	Operator sequencea	Positionb	No. of mismatches	Kd (nM)c
LexA binding sites
fliP	aaAACgTAaGTTCG	Inside (+54)	4	>200
rpe	CGAACATgTtTTCG	Inside (+369)	2	>200
sigH	CGAAacTtTGTTCG	Inside (+127)	3	>200
ylbC	aGAACATAgGTTCc	Inside (+46)	3	9.2
yonT	CGAACATAaGTTtt	−320	3	16
yqkA	gaAACtTgTGTTCG	Inside (+535)	4	>200
Sites that do not bind LexA
cysS	gaAACATtcGTTCc	Inside	5
leuB	tGAAaATATGTTCG	Inside	2
nprE	aGAACATATtTTCc	Inside	3
resE	gGAAttTATGTTtG	Inside	4
rpoC	CGAACgcATtTTCG	Inside	3
rsbU	gGAACtTtaGTTCc	Inside	5
xylR	gGAACAatcGTTCt	Inside	5
yaaC	gaAACATtTaTTCG	Inside	4
ybaL	aGAAtATgTGTTtG	Inside	4
yobR	CaAACAcATaTTCG	Inside	3
yqbA	CGAAagTATGTTCa	Inside	3
yqeV	aGAAttTATGTTCt	Inside	4
yurX	CGAACATAaGTTaa	Inside	3

^aNonconsensus nucleotides are shown in lowercase type, consensus nucleotides are shown in uppercase, and destabilizing mismatches are shown in boldface type.

^bLocation of the 3′ end relative to the ATG codon of the respective gene.

^cApparent binding constant.