Peptides and proteins are crucial biomolecules in life. The manifold functions they carry out range from molecular recognition and signaling to catalysis and immune response. However, the native systems are limited to a reduced toolbox of chemical functionalities as well as tridimensional structures. Widening these toolboxes could pave the way to engineer peptides and proteins with enhanced properties compared to their native counterparts and/or with structures and functions unprecedented in Nature. Advances in the chemical and biological synthesis of peptides and proteins, in computational...