Catalyzes the dehydration of trans-3-hydroxy-L-proline (t3LHyp) to Delta(1)-pyrroline-2-carboxylate (Pyr2C). May be involved in a degradation pathway that converts t3LHyp to L-proline, which would allow S.novella to grow on t3LHyp as a sole carbon source. trans-3-hydroxy-L-proline = 1-pyrroline-2-carboxylate + H2O Belongs to the proline racemase family.