ID   5.3.2.6
DE   2-hydroxymuconate tautomerase.
AN   4-oxalocrotonate isomerase.
AN   4-oxalocrotonate tautomerase.
CA   (2Z,4E)-2-hydroxyhexa-2,4-dienedioate = (3E)-2-oxohex-3-enedioate.
CC   -!- Involved in the meta-cleavage pathway for the degradation of phenols,
CC       modified phenols and catechols.
CC   -!- The enol form (2Z,4E)-2-hydroxyhexa-2,4-dienedioate is produced as
CC       part of this pathway and is converted to the keto form (3E)-2-oxohex-
CC       3-enedioate by the enzyme.
CC   -!- Another keto form, (4E)-2-oxohex-4-enedioate (4-oxalocrotonate),
CC       was originally thought to be produced by the enzyme but later shown
CC       to be produced non-enzymatically.
DR   Q01468, 4OT1_PSEPU ;  Q8RQD2, 4OT2_PSEPU ;  Q9Z431, 4OT3_PSEPU ;
DR   Q93JW0, 4OT4_PSEPU ;  P70994, 4OT_BACSU  ;  Q9RHM8, 4OT_COMTE  ;
DR   Q8KRR5, 4OT_PSEFL  ;  P49172, 4OT_PSEUF  ;  Q9ZI54, 4OT_STUST  ;
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