Table 2.

PhoA enzymatic activities in wild type strain BW25113 carrying plasmids containing the indicated phoA gene fusions

Plasmid	Promoter	Signal sequence	PhoA activity units‡ (SEM)
—	—	—	4.3 (1.3)
pCH58	bla	—	22 (6.7)
pCH58-marB*	bla	marB	390 (40)
pCH58-marB-SS#	bla	marB	410 (19)
pCH58-SS	bla	phoA	1600 (250)

^*pCH58-marB contains full marB (except stop codon) cloned upstream of phoA.

^#pCH58-marB-SS contains only marB signal sequence cloned upstream of phoA.

^‡These values are the averages of at least 6 independent experiments, with SEM in parentheses.