FIG. 1.

Architecture of fermentative and respiratory pathways in B. cereus. Genomic data (24) and information from references (12, 26, 45, 60) were used for this scheme. Most of the genes and functions are described in Table 4. TCA, tricarboxylic acid; Q, (mena)quinone; DHAP, dihydroxyacetone phosphate; e⁻, electron; c, cytochrome c; acetyl-CoA, acetyl coenzyme A; FAD, flavin adenine dinucleotide; FADH₂, reduced flavin adenine dinucleotide. The glpD gene encoding sn-glycerol-3-phosphate dehydrogenase was repressed by glucose and induced during aerobic and anaerobic growth on glycerol (reference 60 and data not shown). Respiratory complex III encoded by the qcrABC operon was required for growth on glycerol, while it made only a minor contribution to growth on glucose (45).