<p> This family of proteins are found within apparent operons for the degradation of phenylacetic acid [<cite idref="PUB00015494"/>]. These proteins contain the enoyl-CoA hydratase domain. This activity is consistent with current hypotheses for the degradation pathway [<cite idref="PUB00010200"/>] which involve the ligation of phenylacetate with coenzyme A (paaF), hydroxylation (paaGHIJK), ring-opening (paaN) and degradation of the resulting fatty acid-like compound to a Krebs cycle intermediate (paaABCDE).</p>