Fig. 1

Synthetic pathways of SCFAs and lactate in bacteria. The genes shown in blue or dashed line are described in this paper. Most genes were studied in E. coli strains. The ptb-buk gene does not exist in E. coli but in some Clostridium strains. DHAP: dihydroxyacetone-phosphate; AcCoA: acetyl-CoA; BuCoA: butyryl-CoA