ID   4.2.1.27
DE   Acetylenecarboxylate hydratase.
AN   Acetylenemonocarboxylate hydratase.
AN   Alkynoate hydratase.
AN   Malonate-semialdehyde dehydratase.
CA   3-oxopropanoate = propynoate + H(2)O.
CC   -!- The reaction is effectively irreversible, favoring oxopropanoate
CC       (malonic semialdehyde) and its tautomers.
CC   -!- Also acts on but-3-ynoate forming acetoacetate.
CC   -!- The mechanism appears to involve hydration of the acetylene to
CC       3-hydroxypropenoate, which will spontaneously tautomerize to
CC       3-oxopropanoate.
CC   -!- It is thus analogous to EC 4.1.1.78 in its mechanism.
CC   -!- Formerly EC 4.2.1.71.
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