TABLE 2.

Phenotypic properties of ctaBCDEF transcriptional continuity disruption mutants

Strain and relevant genotype	caa3 contenta in the following medium:
	Schaeffer’s	Schaeffer’s + glucose
RB1 (wild type)	Blue	White
RB996 ΔctaA	White	White
RB1298 ctaBCD′-lacZ CmrbctaBCDEFc	Blue	White
RB1319A ctaBC′-lacZ CmrdctaCDEFc	White	White
RB1320 ctaBC′-lacZ CmrdctaCDEFc	White	White
RB1321 ctaBC′-lacZ CmrdctaCDEFc	White	White

^acaa₃ activity measured with TMPD as a substrate. Blue, caa₃ positive; white, caa₃ not detectable. 

^bThe chloramphenicol resistance cassette is transcribed in the same direction as ctaBCDEF. 

^cGenotypes of integrants show the positions of chloramphenicol resistance cassette and lacZ fusion plasmid integration. 

^dThe chloramphenicol resistance cassette is transcribed in the direction opposite that of ctaBCDEF.