TABLE 4.

OmpT-PA expression levels in various E. coli host cells^a

E. coli host	Medium	OmpT-PA expression level (BPU/g of cell dry wt)
DH5α	LB	115
	M9Y	190
K5	LB	200
	M9Y	430
JM109	LB	95
	M9Y	405
MC4100	LB	182
	M9Y	324
BL21(DE3)	LB	80
	M9Y	335
	M9	510b

^aThe host strains were transformed with plasmid pPAOT (Cm) and cultivated in different media at 28°C PA activity was measured 6 h after induction with 0.5 mM IPTG. M9, M9 minimal medium.

^bPA activity was measured 10 h after induction with IPTG.