Table 1.

Plasmids and strains used in this work.

Plasmids/cells	Relevant properties	Reference/source
pBAd-his	pBAD24 derivative containing the B. subtilis tatAd-his gene; Ampr	[21]
MC4100	F−ΔlacU169 araD139 rpsL150 relA ptsF rbs flbB5301	[36]
MC4100 ΔtatABCDE	tat deletion strain	[8]
MC4100 ΔtatAE	tatA and tatE deletion strain	[8]
MC4100 ΔtatB	tatB deletion strain	[8]
MC4100 ΔtatC	tatC deletion strain	[8]
pBAD-A-Strep	pBAD24 derivative containing the E. coli tatA gene with a C-terminal Strep-II™ tag; Ampr	[37]
pBAD-Ac-Strep	pBAD24 derivative containing the B. subtilis tatAc-strepII gene; Ampr	This study

Amp^r = ampicillin resistant.