... 4-amino-3-hydroxybenzoate cleavage. I,4-amino-3-hydroxybenzoic acid; II, 2-amino-5-carboxymuconic6-semialdehyde; III, 2-hydroxymuconic 6-semialdehyde; IV, 2,5-pyridinedicarboxylic acid. (B) Pathway ... amidol,3-hydroxyanthralinic acid, 1,2,4-trihydroxybenzene and pyrogallol) in aqueous solution were always freshlyprepared and used immediately.Effect of various compounds on the enzyme activityThe ... was analyzed by GC-MS and GC, as described below.Stoichiometry of the enzyme reaction4-Amino-3-hydroxybenzoate-dependent oxygen uptake wasmeasured with a Clark-type oxygen electrode (YellowSprings...