ID 4.1.1.78 DE acetylenedicarboxylate decarboxylase. AN acetylenedicarboxylate carboxy-lyase. AN acetylenedicarboxylate hydratase. CA acetylenedicarboxylate + H2O + H(+) = pyruvate + CO2. CC -!- The mechanism appears to involve hydration of the acetylene and CC decarboxylation of the oxaloacetic acid formed, although free CC oxaloacetate is not an intermediate. CC -!- It is thus analogous to EC 4.2.1.71 in its mechanism. CC -!- Formerly EC 4.2.1.72. //