Delta(1)-pyrroline-5-carboxylate dehydrogenase (EC=126.96.36.199 ), RocA: a proline catabolic enzyme of the aldehyde dehydrogenase (ALDH) protein superfamily. The proline catabolic enzymes, proline dehydrogenase and Delta(1)-pyrroline-5-carboxylate dehydrogenase (P5CDH), catalyze the two-step oxidation of proline to glutamate; P5CDH catalyzes the oxidation of glutamate semialdehyde, utilizing NAD+ as the electron acceptor. In some bacteria, the two enzymes are fused into the bifunctional flavoenzyme, proline utilization A (PutA). In this CD, monofunctional enzyme sequences such as seen in the Bacillus subtilis RocA P5CDH are also present. These enzymes play important roles in cellular redox control, superoxide generation, and apoptosis.