The increasing length and complexity of peptide drug candidates foster the development of novel strategies for their manufacture, which should include sustainable and efficient technologies. In this context, including enzymatic catalysis in the production of peptide molecules has gained interest. Here, several enzymes from ribosomally synthesized and post-translationally modified peptides biosynthesis pathways are reviewed, with attention to their capacity to introduce stability-promoting structural features on peptides, providing an initial framework towards their use in therapeutic peptide production processes.