label: carboxynorspermidine dehydrogenase activity
label_lc: carboxynorspermidine dehydrogenase activity
description: "Catalysis of the reaction: carboxynorspermidine + H2O + NADP+ = H+ + L-aspartate 4-semialdehyde + NADPH + propane-1,3-diamine. Also converts carboxyspermidine to putrescine."