FIG 3.

Central carbon metabolism and energy conservation. (A) Glycolytic and pentose phosphate pathways. (B) The respiratory chain and ATPase. (C) The transhydrogenase cycle for balancing NADPH₂. (D) Recycling of acetate derived from cell wall metabolism (Fig. 10). The following metabolic intermediates that occur in other pathways are labeled in blue: phosphoenolpyruvate (PEP) (Fig. 4 and 10), glucose-6-phosphate (Glucose-6-P) (Fig. 6), fructose-6-phosphate (Fig. 10), glyceraldehyde-3-phosphate (GAP) (Fig. 7 and 10), dihydroxyacetone phosphate (DHAP) (Fig. 6), 3-P-Glycerate (Fig. 4), pyruvate (Fig. 4 and 8 to 10), acetyl-CoA (Fig. 6 and 10), ribose-5-phosphate (Fig. 5 and 7), erythrose-4-phosphate (Fig. 4), menaquinone/menaquinol (MQ) (Fig. 9), heme (Fig. 8), acetate (Fig. 10), and coenzyme A (Fig. 6 and 10). FBP, fructose 1,6-bisphosphate.