Structural and enzymatic properties of an in vivo proteolytic form of PD-S2, type 1 ribosome-inactivating protein from seeds of Phytolacca dioica L.

► PD-S2 is type 1 ribosome-inactivating protein in seeds of Phytolacca dioica. ► PD-S2, presents an in vivo proteolytic form, named cutPD-S2. ► cutPD-S2 is involved in a process governed by asparagine-specific endopeptidases. ► PD-S2 has a defence role providing essentials amino acids for seedling development.