This model represents the enzyme which hydrates the double bond of 2-oxo-hepta-3-ene-1,7-dioic acid to form 4-hydroxy-2-oxo-heptane-1,7-dioic acid in the catabolism of 4-hydroxyphenylacetic acid. The gene for this enzyme is generally found adjacent to other genes of this pathway in an apparent operon.
Jiyao W et al.(2023). "The conserved domain database in 2023.",