ID 1.2.1.99 DE 4-(gamma-glutamylamino)butanal dehydrogenase. CA (1) 4-(gamma-L-glutamylamino)butanal + H2O + NAD(+) = 4-(gamma-L- CA glutamylamino)butanoate + 2 H(+) + NADH. CA (2) 4-(gamma-L-glutamylamino)butanal + H2O + NADP(+) = 4-(gamma-L- CA glutamylamino)butanoate + 2 H(+) + NADPH. CC -!- The enzyme, characterized from the bacterium Escherichia coli, CC is involved in a putrescine catabolic pathway. CC -!- It has a broad substrate range, and can also catalyze the activities CC of EC 1.2.1.19 and EC 1.2.1.24. //