Carboxynorspermidine synthase (EC 1.5.1.43, "carboxynorspermidine dehydrogenase", "carboxyspermidine dehydrogenase", "CASDH", "CANSDH") is an enzyme with systematic name "carboxynorspermidine:NADP+ oxidoreductase". This enzyme catalyses the following chemical reactions
 (1) carboxynorspermidine + H2O + NADP+ formula_1 L-aspartate 4-semialdehyde + propane-1,3-diamine + NADPH + H+
 (2) carboxyspermidine + H2O + NADP+ formula_1 L-aspartate 4-semialdehyde + putrescine + NADPH + H+
The reaction takes place in the opposite direction.
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