Figure 4

The synthesis pathways from acetyl-CoA to butyrate. Strains AF52-21T, CM04-06T and ATCC 27768T are presented as blue, red, and yellow, respectively. Thl, thiolase; Hdb, β-hydroxybutyryl-CoA dehydrogenase; Cro, crotonase; Bcd, butyryl-CoA dehydrogenase; But, butyryl-CoA:acetate CoA transferase; Ptb, phosphate butyryltransferase; Buk, butyrate kinase.