ALDH1A1 (aldehyde dehydrogenase) in the cytosol catalyzes the reaction of acetaldehyde and NAD+ to form acetate and NADH + H+ (Inoue et al. 1979). The active form of the enzyme is a tetramer (Ni et al. 1999).
aldehyde dehydrogenase (NAD+) activity of ALDH1A1 tetramer [cytosol]