TABLE 1.

Bacteria and plasmids used in the study

Strains or plasmids	Relevant phenotype	Source or reference
E. coli DH5α	recA1 endA1 hsdR17 D lacU169(φ80lacZΔM15)	20
E. coli BL21	hsdS gal(λimm434 cIts b2 red Dam Sam/λ)	20
M6M	M6 strain deficient in methyl parathion hydrolase	This work
pUC19	Ampr	20
pET-29	Ampr	Novagen
pMT1	Ampr, pUC19 vector with 2.2-kb foreign fragment	This work
pMT2	Ampr, pUC19 vector with 4.5-kb foreign fragment	This work
pETM	Ampr, pET-29 vector with 1.0-kb foreign fragment	This work