Catalyzes the irreversible NADP-dependent oxidation of glyceraldehyde-3-phosphate to 3-phosphoglycerate. Is not able to use NAD instead of NADP. May play an important role in NADPH production in S.equinus. D-glyceraldehyde 3-phosphate + H2O + NADP(+) = (2R)-3-phosphoglycerate + 2 H(+) + NADPH Optimum pH is 8.5. Optimum temperature is 60 degrees Celsius. Homotetramer. Up-regulated by the catabolite control protein A (CcpA). S.bovis does not display glucose-6-phosphate dehydrogenase (G6PDH) and 6-phosphogluconate dehydrogenase (6PGDH) activities, indicating that it does not have the hexose monophosphate pathway. Belongs to the aldehyde dehydrogenase family.