TABLE 2.

Expression of the acoABCL operon and acoR

Strain	Relevant genotype	β-Galactosidase specific activity (Miller units/mg of protein)
		CSK	CSK + 10 mM acetoin	CSK + 10 mM acetoin + 0.5% glucose
QB7700	acoA′-′lacZ	145	48,975	655
QB7701	acoA′-′lacZ ccpA::spc	535	55,210	50,035
QB7704	acoA′-′lacZ acoR::aphA3	10	10	3
QB7702	acoA′-′lacZ sigL::aphA3	5	2	3
QB7713	acoR′-′lacZ	155	140	10
QB7714	acoR′-′lacZ pACOR1	125	145	5
QB7724	acoA′-′lacZ pMutin4	355	3,875	NDa
QB7725	acoB′-′lacZ pMutin4	470	4,230	ND
QB7726	acoC′-′lacZ pMutin4	95	4,740	ND
QB7727	acoL′-′lacZ pMutin4	45	3,765	ND
QB7733	acoR′-′lacZ pACOR1 ccpA::spc	215	230	220

^aND, not determined.