ID   4.2.1.83
DE   4-oxalmesaconate hydratase.
AN   4-carboxy-2-oxohexenedioate hydratase.
CA   2-hydroxy-4-oxobutane-1,2,4-tricarboxylate = (1E,3E)-4-hydroxybuta-1,3-
CA   diene-1,2,4-tricarboxylate + H(2)O.
CC   -!- This enzyme participates in the degradation of protocatechuate (via
CC       the meta-cleavage pathway), syringate and gallate, catalyzing the
CC       reaction in the opposite direction.
CC   -!- It accepts the enol-form of 4-oxalomesaconate, 2-hydroxy-4-carboxy-
CC       hexa-2,4-dienedioate.
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