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• W3138350170 abstract "Nucleotide-binding domain and leucine-rich repeat pyrin-domain containing protein 1 (NLRP1) is an inflammasome sensor that mediates the activation of caspase-1 to induce cytokine maturation and pyroptosis1–4. Gain-of-function mutations of NLRP1 cause severe inflammatory diseases of the skin4–6. NLRP1 contains a function-to-find domain that auto-proteolyses into noncovalently associated subdomains7–9, and proteasomal degradation of the repressive N-terminal fragment of NLRP1 releases its inflammatory C-terminal fragment (NLRP1 CT)10,11. Cytosolic dipeptidyl peptidases 8 and 9 (hereafter, DPP8/DPP9) both interact with NLRP1, and small-molecule inhibitors of DPP8/DPP9 activate NLRP1 by mechanisms that are currently unclear10,12–14. Here we report cryo-electron microscopy structures of the human NLRP1–DPP9 complex alone and with Val-boroPro (VbP), an inhibitor of DPP8/DPP9. The structures reveal a ternary complex that comprises DPP9, full-length NLRP1 and the NLRPT CT. The binding of the NLRP1 CT to DPP9 requires full-length NLRP1, which suggests that NLRP1 activation is regulated by the ratio of NLRP1 CT to full-length NLRP1. Activation of the inflammasome by ectopic expression of the NLRP1 CT is consistently rescued by co-expression of autoproteolysis-deficient full-length NLRP1. The N terminus of the NLRP1 CT inserts into the DPP9 active site, and VbP disrupts this interaction. Thus, VbP weakens the NLRP1–DPP9 interaction and accelerates degradation of the N-terminal fragment10 to induce inflammasome activation. Overall, these data demonstrate that DPP9 quenches low levels of NLRP1 CT and thus serves as a checkpoint for activation of the NLRP1 inflammasome. Structures of NLRP1–DPP9 alone and with a small-molecule inhibitor of DPP9 reveal the mechanisms through which NLRP1 is regulated, providing insights into the role of this complex in inflammasome regulation." @default.
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• W3138350170 date "2021-03-17" @default.
• W3138350170 modified "2023-10-10" @default.
• W3138350170 title "DPP9 sequesters the C terminus of NLRP1 to repress inflammasome activation" @default.
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• W3138350170 doi "https://doi.org/10.1038/s41586-021-03350-4" @default.
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