Delta l-pyrroline-5-carboxylate synthetase <p> delta l-pyrroline-5-carboxylate synthetase contains a glutamate 5-kinase (ProB, <db_xref db="EC" dbkey="2.7.2.11"/>) region followed by a gamma-glutamyl phosphate reductase (ProA, <db_xref db="EC" dbkey="1.2.1.41"/>) region and catalyses the first and second steps in proline biosynthesis.</p>