NADP-dependent dehydrogenase of the nED (non-phosphorylated Entner-Doudoroff) pathway with highest activity towards glyceraldehydes (e.g. D,L-glyceraldehyde and D-glyceraldehyde), to a lesser extent towards D,L-glyceraldehyde-3-phosphate and glycolaldehyde, but no activity towards aliphatic or aromatic aldehydes. D-glyceraldehyde + H2O + NADP(+) = (R)-glycerate + 2 H(+) + NADPH Stable for 2 hours at 60 degrees Celsius but activity is decreased to less than 50 percent within 15 minutes at 70 degrees Celsius. kcat is 10 sec(-1) with glyceraldehyde as substrate, 12 sec(-1) with glyceraldehyde-3-phosphate as substrate, 20 sec(-1) with glycolaldehyde as substrate and 10 sec(-1) with NADP as substrate (at pH 6.9 and 58 degrees Celsius). Optimum pH is 6.6. Optimum temperature is 63 degrees Celsius. Carbohydrate degradation; glycolysis. Homotetramer (By similarity). Dimer of dimers. Belongs to the aldehyde dehydrogenase family. Glyceraldehyde dehydrogenase subfamily.