The prokaryotic ubiquitin-like protein presents poor cleavage sites for proteasomal degradation
Summary: In an event reminiscent of eukaryotic ubiquitination, the bacterial prokaryotic ubiquitin-like protein (Pup)-proteasome system (PPS) marks target proteins for proteasomal degradation by covalently attaching Pup, the bacterial tagging molecule.Yet, ubiquitin is released from its conjugated target following proteasome binding, whereas Pup en