NAD+-dependent 4-trimethylaminobutyraldehyde dehydrogenase, ALDH family 9A1
NAD+-dependent, 4-trimethylaminobutyraldehyde dehydrogenase (TMABADH, EC=1.2.1.47), also known as aldehyde dehydrogenase family 9 member A1 (ALDH9A1) in humans, is a cytosolic tetramer which catalyzes the oxidation of gamma-aminobutyraldehyde involved in 4-aminobutyric acid (GABA) biosynthesis and also oxidizes betaine aldehyde (gamma-trimethylaminobutyraldehyde) which is involved in carnitine biosynthesis.