ID 1.2.1.74 DE abieta-7,13-dien-18-al dehydrogenase. AN abietadienal dehydrogenase. CA abieta-7,13-dien-18-al + H2O + NAD(+) = abieta-7,13-dien-18-oate + 2 H(+) CA + NADH. CC -!- Abietic acid is the principle component of conifer resin. CC -!- This enzyme catalyzes the last step of the pathway of abietic acid CC biosynthesis in Abies grandis (grand fir). CC -!- The activity has been demonstrated in cell-free stem extracts of A. CC grandis, was present in the cytoplasm, and required NAD(+) as CC cofactor. CC -!- The enzyme is expressed constitutively at a high level, and is not CC inducible by wounding of the plant tissue. //