H2O + L-glutamate 5-semialdehyde + NAD(+) = 2 H(+) + L-glutamate + NADH Amino-acid degradation; L-proline degradation into L-glutamate; L-glutamate from L-proline: step 2/2. By proline and is regulated by a common control element encoded by the PUT3 gene. Present with 17200 molecules/cell in log phase SD medium. Belongs to the aldehyde dehydrogenase family.