The Wood-Ljungdahl pathway and CO
fixation in D. hafniense DCB-2. (a) Key enzymes involved in the Wood-Ljungdahl pathway and the corresponding gene homologs are indicated. The pathway depicts the methyl branch (left) and the carbonyl branch (right) prior to forming acetyl-CoA. Reactions for the methyl group that is derived from vanillate demethylation are indicated with red arrows; DHB, 3,4-dihydroxybenzoate. Homolog searches were performed by BLASTP with cutoff values of 1e-2 (E-value) and 30% identity in amino acid sequence. (b) Autotrophic cell growth of D. hafniense DCB-2 as measured by total number of the cell per ml culture.