ID 4.2.1.80 DE 2-oxopent-4-enoate hydratase. AN 2-keto-4-pentenoate hydratase. AN OEH. CA (S)-4-hydroxy-2-oxopentanoate = (2Z)-2-hydroxypenta-2,4-dienoate + H2O. CC -!- The enzyme is involved in the catechol meta-cleavage pathway, a major CC mechanism for degradation of aromatic compounds. CC -!- Also acts, more slowly, on cis-2-oxohex-4-enoate, but not on the CC trans-isomer. CC -!- The enzyme was named when it was thought that the substrate is CC 2-oxopent-4-enoate. CC -!- However, it was later found that the actual substrate is its tautomer CC (2Z)-2-hydroxypenta-2,4-dienoate. CC -!- In some organisms the enzyme forms a complex with EC 4.1.1.77. DR Q9KWS4, AMNF_PSESP ; Q47HM0, MHPD1_DECAR; Q400K2, MHPD1_PSEPU; DR Q47GC8, MHPD2_DECAR; Q49KF9, MHPD2_PSEPU; Q706S1, MHPD3_PSEPU; DR C1DRI8, MHPD_AZOVD ; A4JPX9, MHPD_BURVG ; Q9S156, MHPD_COMTE ; DR A7ZI97, MHPD_ECO24 ; B7L506, MHPD_ECO55 ; Q8XEC1, MHPD_ECO57 ; DR B5Z2Q5, MHPD_ECO5E ; B7NK05, MHPD_ECO7I ; B7MPB7, MHPD_ECO81 ; DR B7M2Z8, MHPD_ECO8A ; A7ZWZ7, MHPD_ECOHS ; P77608, MHPD_ECOLI ; DR B7N8Q7, MHPD_ECOLU ; B1LIN5, MHPD_ECOSM ; A6TAC6, MHPD_KLEP7 ; DR B2JQV8, MHPD_PARP8 ; Q13VU0, MHPD_PARXL ; Q3Z556, MHPD_SHISS ; //