PUP_BIFLS pup 67 MPQQFEQPQAQQAVTQEDDALATTQAATQTESTDQADVLDDILDDIESTLETNAEEYVNSFVQKGGE BLIJ_2202 Prokaryotic ubiquitin-like protein Pup Bacterial ubiquitin-like modifier Protein modifier that is covalently attached to lysine residues of substrate proteins, thereby targeting them for proteasomal degradation. The tagging system is termed pupylation (By similarity). Blon_2125