The enzyme trans-<small>L</small>-3-hydroxyproline dehydratase () catalyzes the chemical reaction
This enzyme belongs to the family of lyases, specifically the hydro-lyases, which cleave carbon-oxygen bonds. The systematic name of this enzyme class is trans-<small>L</small>-3-hydroxyproline hydro-lyase (ÃÂ<sub>1</sub>-pyrroline-2-carboxylate-forming). This enzyme is also called trans-<small>L</small>-3-hydroxyproline hydro-lyase.