FIG. 15.

Proposed peripheral pathway for the anaerobic catabolism of catechol to 3-hydroxybenzoyl-CoA in T. aromatica. The enzymes involved, according to data described previously by Ding et al. (90), are recruited from the phenol degradation pathway (green arrows), 3-hydroxybenzoate pathway (red arrows), and 4-HBA pathway (blue arrows) The enzymes are as follows: E1 and E2, phenylphosphate synthase and phenylphosphate carboxylase, respectively; HbcL, 3-hydroxybenzoate-CoA ligase; HcrCAB, 4-hydroxybenzoyl-CoA reductase.