Cleaves SYN1, releasing sister chromatid cohesion. Required for the release of cohesin at anaphase I and anaphase II, whereas the release of cohesin during diplotene and diakinesis occurs in a separase-independent process. Essential for embryo and endosperm development. May play a role in centromeric heterochromatin structure/formation during early meiosis, non-homologous centromere association and radial microtubule system (RMS) formation. May regulate the mitosis-specific cyclin CYCB1-1. All bonds known to be hydrolyzed by this endopeptidase have arginine in P1 and an acidic residue in P4. P6 is often occupied by an acidic residue or by a hydroxy-amino-acid residue, the phosphorylation of which enhances cleavage. Expressed in roots, stems, leaves and buds. Embryo lethality. Embryos arrested at the globular stage, no cellularization of endosperm nuclei and enlargment of many nuclei and nucleoli resulting in a titan-like phenotype.