Probable thiol protease (By similarity). Required for RRS1-mediated resistance against Ralstonia solanacearum. Plays a crucial role as host factor for PopP2-triggered RRS1-mediated resistance. Interacts with the R.solanacearum type III effector PopP2 to form a nuclear complex that is required for activation of the RRS1-mediated resistance response (PubMed:18708476). Interacts with the Ralstonia solanacearum type III effector PopP2. Predominantly vacuolar. From the Golgi apparatus, probably transported to the lytic vacuole (LV) in clathrin-coated vesicles (CCVs) via the prevacuolar compartment (PVC). Relocalizes to the nucleus when associated in a complex with the Ralstonia solanacearum type III effector PopP2. By high salt conditions (PubMed:8325504). Induced by drought stress (PubMed:8325504, PubMed:12102506). Belongs to the peptidase C1 family.