Fig. 4. Putative catabolism pathway of propanoate in the KEGG
database. The blue and red lines are the possible catabolic pathway I
and II, respectively.
Fig. 5. The transition of different carbon atoms from propanol
(or propanoate) in the two possible catabolic pathways. The blue hexagon
denotes the coenzyme A groups. The colored circles denote carbon atoms
of different position in the carbon backbone. The red, yellow and purple
circles denote the carbon atoms from the first, second and third atom of
the propanoate carbon backbone, respectively. Green atoms denote the
carbon atoms from intracellular carbon dioxide.