. "Also converts 3-oxopropanoate into acetyl-CoA." . "The reaction occurs in two steps with the decarboxylation process preceding CoA-binding." . "Bicarbonate rather than CO(2) is released as a final product." . . . "Methylmalonate-semialdehyde dehydrogenase (acylating)" . "MSDH" . "MMSA dehydrogenase" . "2-methyl-3-oxopropanoate + CoA + H(2)O + NAD(+) = propanoyl-CoA + HCO(3)(-) + NADH." .