Minor mitochondrial aldehyde dehydrogenase isoform. Plays a role in regulation or biosynthesis of electron transport chain components. Involved in the biosynthesis of acetate during anaerobic growth on glucose (By similarity). an aldehyde + H2O + NADP(+) = a carboxylate + 2 H(+) + NADPH an aldehyde + H2O + NAD(+) = a carboxylate + 2 H(+) + NADH Induced by potassium ions. Alcohol metabolism; ethanol degradation; acetate from ethanol: step 2/2. Belongs to the aldehyde dehydrogenase family.