Converts proline to delta-1-pyrroline-5-carboxylate. a quinone + L-proline = (S)-1-pyrroline-5-carboxylate + a quinol + H(+) Amino-acid degradation; L-proline degradation into L-glutamate; L-glutamate from L-proline: step 1/2. Expressed in liver, kidney, heart and to a lesser extent in brain, lung and muscle. Pro/re mice that have a premature termination on Prodh are sluggish in their movement. Belongs to the proline oxidase family. Truncated N-terminus. Truncated N-terminus.