Only the deletion of a gene encoding an FAD-dependent monooxygenase (NRRL3_04659) resulted in a strain that was unable to grow on gallic acid.  Metabolomic studies showed accumulation of gallic acid in the ΔNRRL3_04659 mutant suggesting that this predicted monooxygenase is involved in the first step of gallic acid metabolism and is likely responsible for oxidation of the aromatic ring.
NRRL3_04659