K13821 RHH-type transcriptional regulator, proline utilization regulon repressor / proline dehydrogenase / delta 1-pyrroline-5-carboxylate dehydrogenase [EC:1.5.5.2 1.2.1.88] | (GenBank) bifunctional proline dehydrogenase/L-glutamate gamma-semialdehyde dehydrogenase