Main Reaction: NAD+ + vanillin >> 2 H+ + NADH + vanillate

Reference: PubMed ID: 6870241
Authors: Pometto AL 3rd, Crawford DL
Title: Whole-cell bioconversion of vanillin to vanillic acid by Streptomyces viridosporus.
Published: 1983 May

NAD + vanillin --> 2 H + NADH + vanillate