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Bacteria belonging to the phyla Actinobacteria and Nitrospira possess proteasome cores homologous to the eukaryotic 20S proteasome particle. In these bacteria, the cytoplasmic signal for proteasomal degradation is a small protein termed Pup (prokaryotic ubiquitin‐like protein). PafA, the only known Pup ligase, conjugates Pup to lysine side chains of target proteins. In contrast to the eukaryotic ubiquitin‐proteasome...
Pup, a ubiquitin analog, tags proteins for degradation by the bacterial proteasome. As an intracellular proteolytic system, the Pup‐proteasome system (PPS) must be carefully regulated to prevent excessive protein degradation. Currently, those factors underlying PPS regulation remain poorly understood. Here, experimental analysis combined with theoretical modeling of in vivo protein pupylation revealed...
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