Table 2.

Effect of RpoS on type III promoters from EHEC strain 86-24

lacZ fusions*	β-galactosidase activity, nmol/min/mg protein
	MC4100	RH90†	RH90 (pVS33)
LEE1	46,540 ±  6,938	40,310 ±  3,020	nt
LEE2	47,396 ±  8,870	41,212 ±  4,615	nt
LEE3	36,250 ±  884	14,250 ±  204	34,724 ± 754
bla	33,783 ±  7,250	34,073 ±  6,215	nt

nt, not tested. 

*Multicopy lacZ fusions in plasmid pRS551 in MC4100. 

^† RH90 is MC4100 (rpoS∷Tn10); pVS33; rpoS in pBAD33 (induced with 0.2% Arabinose).