ID 1.2.1.18 DE malonate-semialdehyde dehydrogenase (acetylating). CA (1) 3-oxopropanoate + CoA + NADP(+) = acetyl-CoA + CO2 + NADPH. CA (2) 3-oxopropanoate + CoA + NAD(+) = acetyl-CoA + CO2 + NADH. //