Catalyzes the dehydration of cis-3-hydroxy-L-proline (c3LHyp) to Delta(1)-pyrroline-2-carboxylate (Pyr2C). May be involved in a degradation pathway that converts c3LHyp to L-proline, which would allow S.novella to grow on c3LHyp as a sole carbon source. cis-3-hydroxy-L-proline = 1-pyrroline-2-carboxylate + H2O Binds 1 Mg(2+) ion per subunit. Belongs to the mandelate racemase/muconate lactonizing enzyme family.