Bacterial protease adaptor ClpS (ClpS)

Bacterial protease sequestration refers to mechanisms where adaptor proteins like ClpS bind specific N-terminal residues on substrates according to the N-end rule, delivering them to AAA+ proteases such as ClpAP for ATP-dependent unfolding and degradation.[1][3] In pathogens like Salmonella, ClpS targets regulatory proteins such as PhoP, promoting its degradation to control virulence and adaptation to host environments like low magnesium.[1] This process maintains protein homeostasis by eliminating damaged, misfolded, or regulatory proteins, preventing toxicity and enabling stress responses.[3] Protease sequestration contrasts with direct enzymatic action by using compartmentalized chambers in ClpP to isolate active sites, ensuring specificity and avoiding non-specific proteolysis.[3][5] Interactions can be modulated by competitors like MgtC, which protect substrates from ClpS binding, extending their half-life during infection.[1] While central to bacterial physiology and pathogenesis, this is not a singular therapeutic target like a receptor or enzyme but a pathway studied for antibiotic development, such as activators of ClpP like ADEPs that dysregulate proteolysis.[3] No approved drugs directly target ClpS, though disruptions enhance bacterial clearance in models.[1][3]

Other names

ClpS adaptorN-end rule adaptor