TABLE 4.

Expression of genes involved in electron transport or cytochrome metabolism in B. subtilis JH641 grown under anaerobic conditions^a

Gene	Description	Induction (fold)
		Nitrate	Nitrite	Fermentation
cydA	Cytochrome bd ubiquinol oxidase (subunit I)	5.4	27.8	62.2
cydB	Cytochrome bd uniquinol oxidase (subunit II)	16.1	40.0	78.4
cydC	ABC membrane transporter (ATP-binding protein)	16.5	61.2	104.4
cydD	ABC membrane transporter (ATP-binding protein)	19.6	59.4	74.2
ctaA	Heme-containing membrane protein	6.5	11.1	13.7
ctaB	Cytochrome caa3 oxidase assembly factor	2.1	3.5	4.1
ctaC	Cytochrome caa3 oxidase (subunit II)	5.3	6.1	9.7
ctaD	Cytochrome caa3 oxidase (subunit I)	4.5	6.6	11.4
ctaE	Cytochrome caa3 oxidase (subunit III)	3.6	3.6	5.3
ctaF	Cytochrome caa3 oxidase (subunit IV)	1.8	1.9	2.6
ctaG		2.4	2.5	2.4
hemH	Ferrochelatase	6.3	8.3	13.8
hemY	Protoporphyrinogen IX and coproporphyrinogen III oxidase	6.2	8.1	12.1
hemE	Uroporphyrinogen III decarboxylase	5.2	8.3	12.5
resA	Similar to cytochrome c biogenesis protein	3.8	6.1	6.0
resB	Similar to cytochrome c biogenesis protein	4.2	5.7	6.3
resC	Similar to cytochrome c biogenesis protein	4.5	6.6	6.5
qcrA	Menaquinol:cytochrome c oxidoreductase (iron-sulfur subunit)	3.6	3.7	2.6
qcrB	Menaquinol:cytochrome c oxidoreductase (cytochrome b subunit)	3.8	3.8	3.0
qcrC	Menaquinol:cytochrome c oxidoreductase (cytochrome bc subunit)	2.3	1.7	1.7
qoxA	Cytochrome aa3 quinol oxidase (subunit II)	2.0	3.0	2.9
qoxB	Cytochrome aa3 quinol oxidase (subunit I)	2.0	2.8	3.2
qoxC	Cytochrome aa3 quinol oxidase (subunit III)	2.1	3.0	2.5
qoxD	Cytochrome aa3 quinol oxidase (subunit IV)	2.2	3.4	3.0

^aGrowth conditions and data presentation are as described in Table 1. No pyruvate was added for fermentation growth.