A schematic of putative carbon flux in R. centenum. Aerobic reactions are designated with solid lines, micro- or anaerobic reactions with dotted lines. The participating enzymes in the major reactions are numbered: 1. pyruvate dikinase (RC1_1667); 2. pyruvate kinase (RC1_2135 and RC1_2401); 3. phosphoenolpyruvate synthase (RC1_3562); 4. phosphoenolpyruvate carboxykinase (RC1_2822); 5. phosphoenolpyruvate carboxylase (RC1_2446); 6. malic enzyme (RC1_0405 and RC1_3260); 7. malate dehydrogenase (RC1_4080); 8. malate synthase (RC1_2688); 9. fumarase (RC1_1865); 10. succinate dehydrogenase (RC1_3941). Inter-converison of fumarate and succinate (SUC) can oxidize electron carriers such as quinone (purple labeled) for anaerobic respiration. Alternatively, both pyruvate and acetyl CoA can be used in fermentation. Putatively, Glycerate-3-phosphate (3PG) produced by fixing CO2 into Ribulose-1,5-bipohsphate (RUBP) by Rubisco may be shuffled between the Calvin cycle and glycolysis (hollow arrowhead with question mark).