Catalyzes the reversible conversion of enzymatically produced 2,3-dehydroadipyl-CoA into 3-hydroxyadipyl-CoA. a (3S)-3-hydroxyacyl-CoA = a (2E)-enoyl-CoA + H2O a 4-saturated-(3S)-3-hydroxyacyl-CoA = a (3E)-enoyl-CoA + H2O Aromatic compound metabolism; phenylacetate degradation. Activated by cAMP receptor protein (CRP), integration host factor (IHF) and by phenylacetyl-coenzyme A (PA-CoA) that prevents PaaX from binding its target sequences. Inhibited by PaaX. Mutants accumulate delta3-dehydroadipate and are unable to use phenylacetate as a carbon source. Belongs to the enoyl-CoA hydratase/isomerase family.