{"gene":"NLRP1","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2000,"finding":"NLRP1 (DEFCAP) was identified as a novel member of the mammalian Ced-4 family containing a pyrin-like motif, CARD, nucleotide-binding domain, and leucine-rich repeats. In vitro co-immunoprecipitation showed DEFCAP-L and -S interact with caspase-2 (strong) and caspase-9 (weak). Overexpression of full-length DEFCAP-L (but not -S) induced apoptosis in MCF7 cells; deletion mutagenesis showed the LRR/CARD fragment is constitutively active and killing is blocked by caspase inhibitors, indicating the CARD is critical for apoptosis-inducing activity.","method":"Co-immunoprecipitation, transient overexpression, deletion mutagenesis, cell death reporter assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and deletion mutagenesis in single lab, multiple orthogonal methods","pmids":["11076957"],"is_preprint":false},{"year":2011,"finding":"NLRP1 and CARD8 undergo autoproteolytic cleavage at a conserved SF/S motif within the FIIND domain. Bioinformatics revealed structural similarity to the ZU5-UPA domain of PIDD. Site-directed mutagenesis showed the second serine of the SF/S motif is required for autoproteolysis; conserved glutamic acid and histidine residues nearby also regulate cleavage efficiency.","method":"Bioinformatics/structural modeling, site-directed mutagenesis, autoproteolysis assay","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis with structural modeling, multiple mutants tested, mechanistic mechanism confirmed","pmids":["22087307"],"is_preprint":false},{"year":2012,"finding":"NLRP1 knockout mice demonstrated that the NLRP1 inflammasome is required for anthrax lethal toxin-triggered caspase-1 activation, IL-1β release, and pyroptotic cell death. This cell death escalates to cause acute lung injury independent of IL-1β production but dependent on caspase-1. Muramyl dipeptide-mediated inflammasome formation was not dependent on NLRP1 but on NLRP3.","method":"NLRP1 knockout mouse, anthrax lethal toxin challenge, caspase-1 activity assay, IL-1β measurement, lung injury model","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout mouse with defined molecular and cellular phenotypes, replicated across in vitro and in vivo","pmids":["22753929"],"is_preprint":false},{"year":2013,"finding":"NLRP1 haplotypes associated with autoimmune disease (sharing L155H and M1184V substitutions) cause increased processing of pro-IL-1β to mature IL-1β under basal and TLR-stimulated conditions in primary human monocytes, without altering NLRP1 RNA or protein levels, indicating that the multivariant polypeptide itself has altered function.","method":"Primary human monocyte functional assay, IL-1β ELISA, genotyping","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional assay in primary human cells, single lab, replicated across 3-month period","pmids":["23382179"],"is_preprint":false},{"year":2015,"finding":"Transcription factor ATF4 directly binds the NLRP1 promoter during ER stress and upregulates NLRP1 expression. Both IRE1α and PERK pathways (but not ATF6) modulate NLRP1 gene expression. This was established by mutagenesis, chromatin immunoprecipitation, and CRISPR-Cas9-mediated genome editing.","method":"ChIP, promoter mutagenesis, CRISPR-Cas9 genome editing, qRT-PCR","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal methods (ChIP, mutagenesis, CRISPR) in single lab establish direct transcriptional regulation","pmids":["26086088"],"is_preprint":false},{"year":2015,"finding":"Mice lacking NLRP1 phenocopy IL-18 knockout mice, exhibiting spontaneous obesity and metabolic syndrome due to intrinsic lipid accumulation. Mice with an activating NLRP1 mutation have decreased adiposity and increased plasma IL-18. Genetic deletion of IL-18 prevents the fatal cachexia caused by NLRP1 hyperactivation on high-fat diet, placing NLRP1 upstream of IL-18 in metabolic regulation.","method":"NLRP1 knockout and knock-in mouse models, metabolic phenotyping, genetic epistasis (IL-18 deletion rescue)","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with multiple mouse models and IL-18 rescue experiment in single rigorous study","pmids":["26603191"],"is_preprint":false},{"year":2019,"finding":"Proteasome-mediated degradation of the NLRP1B N-terminal fragment is both necessary and sufficient for NLRP1B activation. Anthrax lethal toxin cleavage triggers this degradation, liberating the C-terminal fragment as a potent caspase-1 activator. Shigella flexneri ubiquitin ligase IpaH7.8 also induces NLRP1B degradation and activation by the same mechanism, establishing 'functional degradation' as a unified activation mechanism.","method":"Proteasome inhibitor studies, reconstitution assays, epistasis with IpaH7.8 (Shigella effector), caspase-1 activation assay","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal approaches (genetic, pharmacologic, reconstitution) across two different activating enzymes, published in Science","pmids":["30872533"],"is_preprint":false},{"year":2018,"finding":"DPP9 was identified as an endogenous inhibitor of the human NLRP1 inflammasome via proteomics screen. DPP9 interacts with the FIIND domain of NLRP1. Its scaffolding function and catalytic activity act synergistically to maintain NLRP1 in an inactive state. A patient-derived germline missense mutation in the NLRP1 FIIND domain abrogates DPP9 binding and leads to inflammasome hyperactivation.","method":"Proteomics screen, Co-IP, CRISPR/Cas9 deletion, DPP8/9 small molecule inhibition, ASC speck formation assay, IL-1β secretion assay, mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (proteomics, Co-IP, CRISPR, chemical biology), patient mutation validation, published in JBC","pmids":["30291141"],"is_preprint":false},{"year":2019,"finding":"DPP8/9 inhibitors (e.g., Val-boroPro) activate all functional rodent NLRP1 alleles. NLRP1 allele sensitivities to DPP8/9 inhibitor-induced and Toxoplasma gondii-induced pyroptosis are strikingly similar, suggesting DPP8/9 inhibition phenocopies a key T. gondii activity.","method":"Pyroptosis assays across multiple rodent NLRP1 alleles, DPP8/9 inhibitor treatment, T. gondii infection comparison","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — allele panel screen and parallel stimuli comparison in single lab","pmids":["31383852"],"is_preprint":false},{"year":2020,"finding":"Human NLRP1 directly binds double-stranded RNA through its leucine-rich repeat domain, and this interaction causes the NACHT domain to gain ATPase activity. SFV replication and dsRNA formation are required to engage the NLRP1 inflammasome; delivery of long dsRNA alone is sufficient to trigger activation.","method":"Biochemical binding assays, ATPase activity assay, mutagenesis of LRR domain, viral infection model, dsRNA transfection","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — biochemical reconstitution showing direct dsRNA binding to LRR domain plus gain of ATPase activity, with genetic validation in Science","pmids":["33243852"],"is_preprint":false},{"year":2020,"finding":"Enteroviral 3C proteases directly cleave human NLRP1 at a single site (Glu130-Gly131), triggering N-glycine-mediated degradation of the autoinhibitory N-terminal fragment via the cullin-ZER1/ZYG11B complex. This liberates the activating C-terminal fragment, leading to inflammasome activation and IL-18 secretion in primary human airway epithelial cells.","method":"In vitro protease cleavage assay, N-degron pathway genetic manipulation (cullin-ZER1/ZYG11B), primary human airway epithelial cell infection, IL-18 ELISA","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro cleavage mapped to single site, N-degron pathway validated genetically, functional readout in primary cells, Science publication","pmids":["33093214"],"is_preprint":false},{"year":2021,"finding":"Cryo-EM structures of the human NLRP1-DPP9 complex reveal a ternary complex comprising DPP9, full-length NLRP1, and the NLRP1 C-terminal fragment (CT). DPP9 sequesters the NLRP1 CT only when full-length NLRP1 is present, suggesting activation is regulated by the ratio of CT to full-length NLRP1. The N-terminus of the NLRP1 CT inserts into the DPP9 active site; Val-boroPro (VbP) disrupts this interaction and accelerates N-terminal fragment degradation.","method":"Cryo-EM structure determination, cell-based inflammasome activation assays, co-expression rescue experiments, VbP inhibitor co-structure","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution cryo-EM with functional validation in cells, mechanistic model confirmed by inhibitor co-structure, Nature publication","pmids":["33731932"],"is_preprint":false},{"year":2021,"finding":"Cryo-EM/biochemical structures of rat NLRP1-DPP9 show a 2:1 complex containing autoinhibited full-length NLRP1 and an active UPA-CARD fragment. The ZU5 domain is required for both NLRP1 autoinhibition and assembly of the 2:1 complex. Complex formation prevents UPA-mediated higher-order oligomerization of UPA-CARD fragments and strengthens ZU5-mediated autoinhibition. Both NLRP1 binding and DPP9 enzymatic activity are required to suppress NLRP1 in human cells.","method":"Cryo-EM, biochemical reconstitution, structure-guided mutagenesis, cell-based functional assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — structure plus mutagenesis plus functional assays in single comprehensive study, Nature publication","pmids":["33731929"],"is_preprint":false},{"year":2021,"finding":"Cryo-EM structures of NLRP1-CT and CARD8-CT assemblies show that CARDs form central helical filaments promoted by oligomerized but flexibly-linked UPAs. NLRP1-CARD filaments drive ASC speck formation; NLRP1-FIINDUPA enhances oligomerization. An exterior CARD dimerization doubles NLRP1CARD filament thickness uniquely among known CARD filaments. ASC uses opposing surfaces to recruit NLRP1 vs. caspase-1.","method":"Cryo-EM (3.7 Å), biochemical reconstitution, cell-based ASC speck formation assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — near-atomic resolution cryo-EM with biochemical and cell-based validation","pmids":["33420033"],"is_preprint":false},{"year":2021,"finding":"The activating domains (FIINDUPA-CARD) of NLRP1 self-oligomerize to form a two-layered filament with an inner CARD core surrounded by an outer FIINDUPA ring. Self-assembled NLRP1-CARD filaments drive ASC speck formation in human cells, and NLRP1-FIINDUPA oligomers greatly enhance this. Structural differences in NLRP1-CARD vs. CARD8-CARD enable selective recruitment of ASC vs. pro-caspase-1, respectively.","method":"Cryo-EM (3.7 Å), recombinant protein reconstitution, cell-based ASC speck assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — structural and biochemical reconstitution with cell validation, orthogonal to companion paper","pmids":["33420028"],"is_preprint":false},{"year":2021,"finding":"Diverse viral proteases from picornaviruses cleave human NLRP1 within a rapidly evolving 'tripwire' region, leading to host-specific and virus-specific activation of the NLRP1 inflammasome. The mechanism parallels anthrax LeTx-driven NLRP1B degradation; cleavage leads to N-terminal degradation and liberation of the bioactive C-terminal domain.","method":"Protease cleavage assays, inflammasome activation assays, evolutionary analysis of cleavage sites","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro cleavage and cell-based activation across multiple viral proteases, mechanistic follow-up with epistasis","pmids":["33410748"],"is_preprint":false},{"year":2021,"finding":"KSHV ORF45 protein activates human NLRP1 inflammasome independently of proteolytic cleavage, by binding the Linker1 region (between PYD and NACHT domains). At steady state, Linker1 interacts with the UPA subdomain to silence NLRP1 in auto-inhibitory complexes independent of DPP9. ORF45 binding to Linker1 displaces UPA from the Linker1-UPA complex, releasing the C-terminal domain for inflammasome assembly. This activation mechanism is conserved in primates but not murine NLRP1b.","method":"Co-IP, domain mutagenesis, inflammasome activation assays, species comparison","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — mechanistic domain mapping with Co-IP, mutagenesis, and cell-based activation assays identifying a non-protease activation pathway","pmids":["35618833"],"is_preprint":false},{"year":2022,"finding":"Human NLRP1 senses the ribotoxic stress response (RSR) triggered by UVB and ribotoxins. ZAKα kinase and its downstream effector p38 directly hyperphosphorylate a human-specific disordered linker region (NLRP1DR). Mutating a single ZAKα phosphorylation site in NLRP1DR abrogates UVB- and ribotoxin-driven pyroptosis in keratinocytes. Fusing NLRP1DR to CARD8 (which is insensitive to RSR) creates a minimal RSR sensor, confirming NLRP1DR is sufficient.","method":"Kinase activity assay, site-directed mutagenesis, domain-swap experiment (NLRP1DR-CARD8), ZAKα/p38 knockout/inhibition, pyroptosis assay","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis identifying key phosphorylation site, domain-swap reconstitution, kinase cascade validated, Science publication","pmids":["35857590"],"is_preprint":false},{"year":2022,"finding":"p38 MAPK directly phosphorylates NLRP1; serine 107 in the linker region is critical for activation by ribotoxic stress and alphavirus infection. This phosphorylation is followed by ubiquitination of NLRP1 PYD, N-terminal degradation, and inflammasome nucleation. Activation by nanobody-mediated ubiquitination, viral proteases, or DPP9 inhibition was independent of p38 activity, establishing p38 as a specific signaling hub for stress-induced activation.","method":"Kinase assay, site-directed mutagenesis (S107), ubiquitination assay, pathway epistasis (p38 inhibitors, ZAKα KO), pyroptosis assay","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct kinase phosphorylation at identified residue with mutagenesis, epistasis showing pathway specificity, orthogonal to Robinson et al. 2022","pmids":["36315050"],"is_preprint":false},{"year":2022,"finding":"SARS-CoV-2 3CL protease cleaves human NLRP1 at Q333, triggering inflammasome assembly, cell death, and limitation of infectious viral particle production in human lung epithelial cells. Multiple coronavirus 3CL proteases activate NLRP1 by this mechanism. 3CL proteases also inactivate Gasdermin D, redirecting pyroptosis to caspase-3/GSDME-mediated alternative pyroptosis.","method":"In vitro protease cleavage assay, NLRP1 knockout cell lines, SARS-CoV-2 infection of lung epithelial cells, cytokine secretion, cell death assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — cleavage site mapped, NLRP1 KO epistasis, infection model, multiple coronaviruses tested","pmids":["35594856"],"is_preprint":false},{"year":2023,"finding":"Diphtheria toxin activates ribotoxic stress response via ZAKα/p38-driven hyperphosphorylation of NLRP1, triggering NLRP1 inflammasome-dependent IL-1β and IL-18 secretion in primary human keratinocytes. NLRP1 deletion abrogates cytokine secretion. ZAKα inhibition was more protective than caspase-1 inhibition in a 3D skin model of cutaneous diphtheria, demonstrating ZAKα functions both upstream of NLRP1 and in non-inflammasome cell death.","method":"NLRP1 and ZAKα knockout/inhibition, cytokine assay, 3D skin model, pharmacologic ZAKα and caspase-1 inhibition","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic KO epistasis and pharmacologic inhibition in physiologically relevant 3D model, mechanistic pathway placement established","pmids":["37642997"],"is_preprint":false},{"year":2023,"finding":"Poly(dA:dT) activates the NLRP1 inflammasome in human keratinocytes via oxidative nucleic acid damage and cellular stress that activates MAP3 kinases including ZAKα converging on p38, rather than through dsRNA intermediates or AIM2/cGAS-STING-NLRP3 pathways. Conventional linear dsDNA fails to activate NLRP1.","method":"NLRP1 knockout, AIM2 and cGAS-STING pathway genetic ablation, ZAKα/p38 inhibitor treatment, caspase-1 activation assay, cytokine secretion","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis ruling out alternative pathways combined with pathway inhibitor evidence, defining mechanism","pmids":["36693106"],"is_preprint":false},{"year":2023,"finding":"Several agents that interfere with protein folding (aminopeptidase inhibitors, chaperone inhibitors, unfolded protein response inducers) accelerate NLRP1 N-terminal fragment degradation. However, the released CT fragments are sequestered by DPP9 and do not form inflammasomes unless DPP9-binding ligands are also present to disrupt CT-DPP9 complexes. This demonstrates NLRP1 detects a specific perturbation involving both protein folding stress and DPP9 ligand accumulation.","method":"Protein folding stress inducers, proteasome assay, DPP9 binding/displacement assay, inflammasome activation assay","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple agents tested, DPP9 sequestration mechanism confirmed biochemically, single lab","pmids":["36649711"],"is_preprint":false},{"year":2024,"finding":"Nigericin activates the NLRP1 inflammasome in human keratinocytes via potassium efflux-dependent inhibition of ribosome elongation, activating RSR sensor kinase ZAKα and downstream p38/JNK, and hyperphosphorylating the NLRP1 linker domain. Extracellular K+ supplementation, ZAKα knockout, or ZAKα/p38 inhibitors block nigericin-induced NLRP1 pyroptosis. Greater K+ depletion is required to activate ZAKα-NLRP1 than NLRP3.","method":"K+ manipulation, ZAKα knockout, pharmacologic ZAKα/p38 inhibition, ionophore panel screen, pyroptosis assay, NLRP1 phosphorylation assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal genetic and chemical interventions, quantitative comparison of K+ thresholds, mechanism fully established","pmids":["38175865"],"is_preprint":false},{"year":2014,"finding":"In rat macrophages, Toxoplasma gondii activates the NLRP1 inflammasome to induce pyroptosis, IL-1β/IL-18 processing, and inhibition of parasite proliferation. Knockdown of Nlrp1 in pyroptosis-sensitive macrophages resulted in higher parasite replication and protection from cell death; overexpression of the NLRP1 variant from sensitive macrophages in resistant cells sensitized them to pyroptosis.","method":"NLRP1 knockdown (siRNA), NLRP1 overexpression (allele transfer), T. gondii infection, pyroptosis/cytokine assay","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 / Strong — bidirectional genetic manipulation (KD and OE), defined cellular phenotype, mechanistic pathway placement","pmids":["24626226"],"is_preprint":false},{"year":2016,"finding":"Heme oxygenase-1 (HO-1) suppresses NLRP1 inflammasome-induced neuronal death after spinal cord injury by inhibiting expression of activating transcription factor 4 (ATF4), a transcription factor that regulates NLRP1 expression. This was demonstrated by immunoprecipitation showing NLRP1 inflammasome formation in spinal cord neurons, and by AAV-mediated HO-1 overexpression reducing NLRP1 expression and neuronal death in vivo and in vitro.","method":"AAV-mediated HO-1 overexpression, immunoprecipitation (NLRP1 complex), ATF4 expression analysis, neuronal death quantification","journal":"Journal of neuroinflammation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of complex and in vivo gain-of-function, single lab, mechanism linked to ATF4 pathway","pmids":["26925775"],"is_preprint":false},{"year":2023,"finding":"NLRP1 interacts with mTOR by co-immunoprecipitation in hippocampal neurons; chronic social defeat stress facilitates this interaction and promotes autophagy impairment. Nlrp1a knockdown inhibited PI3K/AKT/mTOR signaling, rescued impaired autophagy, and ameliorated depressive-like behaviors. Rapamycin (mTOR inhibitor/autophagy inducer) abolished NLRP1 inflammasome-driven inflammation.","method":"Co-immunoprecipitation (NLRP1-mTOR), AAV-mediated Nlrp1a knockdown, rapamycin treatment, western blot, behavioral assays","journal":"Journal of neuroinflammation","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP showing NLRP1-mTOR interaction plus KD epistasis, single lab, mechanistic pathway placement","pmids":["38178196"],"is_preprint":false},{"year":2024,"finding":"In a mouse model of endometriosis, Schwann cell C5aR1 activates the NLRP1 inflammasome, leading to IL-1β release. Silencing C5aR1 in Schwann cells blocked C5a-induced NLRP1 inflammasome activation. IL-1β from Schwann cells recruits macrophages to peripheral nerves, increases oxidative stress, and activates TRPA1, causing widespread pain.","method":"C5aR1 siRNA silencing in Schwann cells, NLRP1 inflammasome activation assay, IL-1β measurement, macrophage recruitment assay, pain behavior in mouse model","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic silencing with defined cellular pathway in mouse model, single lab","pmids":["39587068"],"is_preprint":false},{"year":2023,"finding":"ZAKα/p38 kinase signaling activates the NLRP1 inflammasome in the context of erythroid differentiation, causing ribosomal stress-mediated NLRP1 phosphorylation and assembly. LRRFIP1 and FLII were identified as endogenous inhibitors of the NLRP1 inflammasome in hematopoietic cells, acting independently of DPP9. Genetic inhibition of Nlrp1 in zebrafish reduced neutrophils and increased erythrocytes.","method":"Zebrafish nlrp1 genetic inhibition, identification of LRRFIP1/FLII as NLRP1 inhibitors by interaction studies, ZAKα/p38 phosphorylation assay, hematopoietic differentiation assay","journal":"EMBO molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in zebrafish and human cells, new inhibitory binding partners identified, single lab","pmids":["37675820"],"is_preprint":false}],"current_model":"Human NLRP1 is an innate immune sensor that is maintained in an inactive state through autoproteolytic cleavage within its FIIND domain (generating non-covalently associated ZU5 and UPA-CARD fragments) and sequestration of its activating C-terminal fragment by a DPP9-containing inhibitory complex; diverse pathogen-derived enzymatic activities (anthrax lethal toxin, enteroviral and coronavirus 3C proteases, Shigella IpaH7.8 ubiquitin ligase) or cellular stress signals (dsRNA binding to the LRR domain, ribotoxic stress via ZAKα/p38-mediated phosphorylation of a human-specific disordered linker, potassium efflux) trigger N-terminal fragment degradation via the ubiquitin-proteasome system and N-degron pathway, liberating the C-terminal UPA-CARD fragment to oligomerize into a filamentous inflammasome platform that recruits ASC and activates caspase-1, leading to IL-1β/IL-18 maturation and pyroptotic cell death."},"narrative":{"mechanistic_narrative":"NLRP1 is an innate immune sensor that nucleates an inflammasome platform to drive caspase-1-dependent maturation of IL-1β/IL-18 and pyroptotic cell death in response to diverse pathogen activities and cellular stresses [PMID:22753929, PMID:30872533]. The receptor is held inactive by two coupled mechanisms: constitutive autoproteolysis within its FIIND domain at a conserved SF/S motif generating non-covalently associated fragments [PMID:22087307], and sequestration of the activating C-terminal fragment by DPP9, whose scaffolding and catalytic activities synergize to maintain autoinhibition [PMID:30291141]. Cryo-EM of the NLRP1–DPP9 ternary complex shows DPP9 captures the C-terminal fragment only in the presence of full-length NLRP1, with the CT N-terminus inserting into the DPP9 active site, so that activation is set by the ratio of free CT to full-length protein [PMID:33731932, PMID:33731929]. Activation converges on 'functional degradation': proteasomal destruction of the autoinhibitory N-terminal fragment is necessary and sufficient to liberate the C-terminal UPA-CARD fragment, which oligomerizes into a two-layered filament with an inner CARD core that recruits ASC and templates caspase-1 activation [PMID:30872533, PMID:33420033, PMID:33420028]. This degradation is triggered by pathogen enzymes that cleave NLRP1 within a rapidly evolving 'tripwire' region—anthrax lethal toxin and the Shigella ubiquitin ligase IpaH7.8 [PMID:30872533], enteroviral 3C proteases cleaving at Glu130-Gly131 to expose an N-glycine degron processed by cullin-ZER1/ZYG11B [PMID:33093214, PMID:33410748], and coronavirus 3CL proteases cleaving at Q333 [PMID:35594856]—or by direct sensing: dsRNA binding to the LRR domain confers NACHT ATPase activity [PMID:33243852], and a human-specific disordered linker is hyperphosphorylated at Ser107 by ZAKα/p38 during ribotoxic stress from UVB, ribotoxins, potassium efflux, and oxidative nucleic acid damage [PMID:35857590, PMID:36315050, PMID:38175865]. Patient-derived FIIND mutations that abrogate DPP9 binding and autoimmune-associated haplotypes cause inflammasome hyperactivation [PMID:30291141, PMID:23382179], and NLRP1 acts upstream of IL-18 to control systemic metabolism [PMID:26603191].","teleology":[{"year":2000,"claim":"Established NLRP1 as a multidomain Ced-4-family protein with a CARD capable of engaging caspases and triggering cell death, framing it as a death-signaling scaffold before its inflammasome role was known.","evidence":"Co-immunoprecipitation, deletion mutagenesis, and cell death reporter assays in MCF7 cells","pmids":["11076957"],"confidence":"Medium","gaps":["Caspase-2/-9 interactions did not establish the physiological caspase-1/IL-1β axis","Overexpression apoptosis may not reflect endogenous function"]},{"year":2011,"claim":"Identified FIIND autoproteolysis at the SF/S motif as a constitutive processing event, revealing the structural basis for the two-fragment architecture central to NLRP1 regulation.","evidence":"Bioinformatic ZU5-UPA modeling and site-directed mutagenesis with autoproteolysis assays","pmids":["22087307"],"confidence":"High","gaps":["Functional consequence of cleavage for activation not yet defined","Did not establish how the cleaved fragments are kept inactive"]},{"year":2012,"claim":"Defined the NLRP1 inflammasome in vivo as required for anthrax lethal toxin-triggered caspase-1 activation, IL-1β release, and pyroptosis-driven lung injury, distinguishing it from NLRP3.","evidence":"NLRP1 knockout mice with lethal toxin challenge and lung injury model","pmids":["22753929"],"confidence":"High","gaps":["Molecular mechanism by which lethal toxin activates NLRP1 not yet resolved","Mouse NLRP1B vs human NLRP1 differences unaddressed"]},{"year":2014,"claim":"Showed Toxoplasma gondii activates rodent NLRP1 to restrict parasite replication, linking allelic variation to pyroptosis sensitivity and establishing a pathogen sensing role.","evidence":"Nlrp1 knockdown and allele-transfer overexpression with T. gondii infection in rat macrophages","pmids":["24626226"],"confidence":"High","gaps":["Direct molecular trigger from T. gondii not identified","Allelic determinants of sensitivity not mapped to specific residues"]},{"year":2015,"claim":"Connected NLRP1 to transcriptional control during ER stress (ATF4-driven induction) and to systemic metabolism, placing NLRP1 upstream of IL-18 in adiposity regulation.","evidence":"ChIP/promoter mutagenesis/CRISPR for ATF4 regulation; knockout/knock-in mouse metabolic phenotyping with IL-18 epistasis rescue","pmids":["26086088","26603191"],"confidence":"High","gaps":["Mechanistic link between ER stress transcription and inflammasome assembly unclear","How IL-18 mediates metabolic effects not detailed"]},{"year":2018,"claim":"Identified DPP9 as an endogenous brake whose scaffolding and catalytic functions maintain NLRP1 inactivity, with patient mutations losing DPP9 binding causing hyperactivation.","evidence":"Proteomics, Co-IP, CRISPR deletion, DPP8/9 inhibition, and patient mutation validation","pmids":["30291141"],"confidence":"High","gaps":["Structural basis of DPP9 sequestration not yet resolved","How DPP9 release couples to fragment liberation unknown"]},{"year":2019,"claim":"Unified NLRP1 activation under 'functional degradation', showing proteasomal destruction of the N-terminal fragment is necessary and sufficient to release the C-terminal activator across distinct triggers.","evidence":"Proteasome inhibition, reconstitution, and IpaH7.8 epistasis with caspase-1 readouts; DPP8/9 inhibitor allele panel and T. gondii comparison","pmids":["30872533","31383852"],"confidence":"High","gaps":["Ubiquitin ligases for each trigger not all identified","Degron features driving degradation incompletely mapped"]},{"year":2020,"claim":"Distinguished direct sensing (dsRNA binding to LRR conferring NACHT ATPase activity) from protease-driven N-degron activation, establishing the LRR and the tripwire as parallel input modules.","evidence":"Biochemical dsRNA binding and ATPase assays with viral infection; enteroviral 3C cleavage mapping to Glu130-Gly131 with cullin-ZER1/ZYG11B genetics in primary airway cells","pmids":["33243852","33093214"],"confidence":"High","gaps":["How dsRNA-induced ATPase activity leads to fragment release not resolved","Whether both inputs converge on identical downstream filament unaddressed"]},{"year":2021,"claim":"Cryo-EM of NLRP1–DPP9 complexes and the C-terminal filament revealed the structural logic of autoinhibition (CT sequestration requiring full-length NLRP1, ZU5-dependent assembly) and activation (CARD filament templating ASC recruitment).","evidence":"Cryo-EM of human/rat NLRP1-DPP9 ternary complexes with VbP co-structure; cryo-EM of NLRP1-CT/FIINDUPA-CARD assemblies with ASC speck assays","pmids":["33731932","33731929","33420033","33420028"],"confidence":"High","gaps":["Dynamics of CT release from DPP9 in cells not directly visualized","Stoichiometry of in vivo filament assembly uncertain"]},{"year":2021,"claim":"Extended viral activation to a broad picornaviral protease tripwire and identified a protease-independent route via KSHV ORF45 disrupting a Linker1-UPA autoinhibitory interface, revealing DPP9-independent silencing.","evidence":"Protease cleavage and inflammasome assays with evolutionary analysis; Co-IP and domain mutagenesis for ORF45-Linker1 with species comparison","pmids":["33410748","35618833"],"confidence":"High","gaps":["Full set of host targets within the evolving tripwire not enumerated","Relationship between Linker1-UPA silencing and DPP9 sequestration unclear"]},{"year":2022,"claim":"Defined the ribotoxic stress response as a sensing pathway in which ZAKα/p38 hyperphosphorylate a human-specific disordered linker (Ser107), with the linker sufficient to confer RSR sensitivity and feeding into ubiquitination and N-terminal degradation.","evidence":"Kinase assays, S107 mutagenesis, NLRP1DR-CARD8 domain swap, ZAKα/p38 knockout/inhibition; ubiquitination and pathway epistasis with pyroptosis readouts","pmids":["35857590","36315050"],"confidence":"High","gaps":["Ubiquitin ligase recognizing phosphorylated NLRP1 not identified","How phosphorylation triggers N-terminal degradation mechanistically unclear"]},{"year":2022,"claim":"Established coronavirus 3CL proteases as NLRP1 activators (cleaving at Q333) that also inactivate Gasdermin D to redirect cell death to caspase-3/GSDME pyroptosis, integrating NLRP1 into antiviral defense and viral counter-strategies.","evidence":"In vitro cleavage mapping, NLRP1 knockout cells, SARS-CoV-2 infection of lung epithelia, multiple coronavirus proteases","pmids":["35594856"],"confidence":"High","gaps":["In vivo relevance to COVID-19 pathology not established here","Balance between GSDMD and GSDME outcomes context-dependent"]},{"year":2023,"claim":"Generalized RSR-driven NLRP1 activation to diverse stressors (diphtheria toxin, oxidative DNA damage from poly(dA:dT), protein folding stress) all converging on ZAKα/p38 or coupled to DPP9 ligand accumulation, defining NLRP1 as an integrator of ribosomal and proteostatic stress.","evidence":"NLRP1/ZAKα knockout and inhibitor studies in keratinocytes and 3D skin; pathway-exclusion genetics; protein folding stress inducers with DPP9 displacement assays","pmids":["37642997","36693106","36649711"],"confidence":"Medium","gaps":["Precise upstream lesion sensed by ZAKα across stressors not unified","Quantitative thresholds linking stress to activation undefined"]},{"year":2024,"claim":"Showed potassium efflux activates NLRP1 indirectly through ribosome elongation inhibition and ZAKα/p38, distinguishing the K+ threshold for NLRP1 from NLRP3 and tying ionic perturbation to the RSR sensing axis.","evidence":"K+ manipulation, ZAKα knockout, ZAKα/p38 inhibition, ionophore screen, phosphorylation and pyroptosis assays in keratinocytes","pmids":["38175865"],"confidence":"High","gaps":["Molecular link between K+ loss and ribosome stalling not fully defined","Cell-type specificity of K+-NLRP1 coupling unaddressed"]},{"year":2024,"claim":"Implicated NLRP1 in tissue-specific disease and homeostatic contexts—Schwann cell C5aR1-NLRP1 in pain, NLRP1-mTOR in stress-related depression, and ZAKα/p38-NLRP1 with LRRFIP1/FLII inhibitors in hematopoiesis—broadening its physiological footprint.","evidence":"C5aR1 silencing and pain behavior; NLRP1-mTOR Co-IP and Nlrp1a knockdown with rapamycin; zebrafish nlrp1 inhibition and LRRFIP1/FLII interaction studies","pmids":["39587068","38178196","37675820"],"confidence":"Medium","gaps":["These tissue contexts rely largely on single labs and rodent/zebrafish models","Direct NLRP1-mTOR interaction not structurally validated","LRRFIP1/FLII inhibitory mechanism not mechanistically resolved"]},{"year":null,"claim":"The complete set of ubiquitin ligases and degron-recognition machinery linking each upstream trigger (phosphorylation, cleavage, dsRNA) to N-terminal fragment degradation remains incompletely defined.","evidence":"","pmids":[],"confidence":"High","gaps":["Trigger-specific E3 ligases not all identified","How distinct inputs funnel into a common degradation outcome not unified","Structural snapshot of the activating transition in cells lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[1,6]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[9]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[9]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[4]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[13,14]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[2,6,9]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[11,14]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[2,6,19]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[2,14,19]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[17,21,23]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[3,7]}],"complexes":["NLRP1 inflammasome","NLRP1-DPP9 inhibitory complex"],"partners":["DPP9","ASC","CASP1","ZAK","MAPK14","ATF4","LRRFIP1","FLII"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9C000","full_name":"NACHT, LRR and PYD domains-containing protein 1","aliases":["Caspase recruitment domain-containing protein 7","Death effector filament-forming ced-4-like apoptosis protein","Nucleotide-binding domain and caspase recruitment domain"],"length_aa":1473,"mass_kda":165.9,"function":"Acts as the sensor component of the NLRP1 inflammasome, which mediates inflammasome activation in response to various pathogen-associated signals, leading to subsequent pyroptosis (PubMed:12191486, PubMed:17349957, PubMed:22665479, PubMed:27662089, PubMed:31484767, PubMed:33093214, PubMed:33410748, PubMed:33731929, PubMed:33731932, PubMed:35857590). Inflammasomes are supramolecular complexes that assemble in the cytosol in response to pathogens and other damage-associated signals and play critical roles in innate immunity and inflammation (PubMed:12191486, PubMed:17349957, PubMed:22665479). Acts as a recognition receptor (PRR): recognizes specific pathogens and other damage-associated signals, such as cleavage by some human enteroviruses and rhinoviruses, double-stranded RNA, UV-B irradiation, or Val-boroPro inhibitor, and mediates the formation of the inflammasome polymeric complex composed of NLRP1, CASP1 and PYCARD/ASC (PubMed:12191486, PubMed:17349957, PubMed:22665479, PubMed:25562666, PubMed:30096351, PubMed:30291141, PubMed:33093214, PubMed:33243852, PubMed:33410748, PubMed:35857590). In response to pathogen-associated signals, the N-terminal part of NLRP1 is degraded by the proteasome, releasing the cleaved C-terminal part of the protein (NACHT, LRR and PYD domains-containing protein 1, C-terminus), which polymerizes and associates with PYCARD/ASC to initiate the formation of the inflammasome complex: the NLRP1 inflammasome recruits pro-caspase-1 (proCASP1) and promotes caspase-1 (CASP1) activation, which subsequently cleaves and activates inflammatory cytokines IL1B and IL18 and gasdermin-D (GSDMD), leading to pyroptosis (PubMed:12191486, PubMed:17349957, PubMed:22665479, PubMed:32051255, PubMed:33093214). In the absence of GSDMD expression, the NLRP1 inflammasome is able to recruit and activate CASP8, leading to activation of gasdermin-E (GSDME) (PubMed:33852854, PubMed:35594856). Activation of NLRP1 inflammasome is also required for HMGB1 secretion; the active cytokines and HMGB1 stimulate inflammatory responses (PubMed:22801494). Binds ATP and shows ATPase activity (PubMed:11113115, PubMed:15212762, PubMed:33243852). Plays an important role in antiviral immunity and inflammation in the human airway epithelium (PubMed:33093214). Specifically recognizes a number of pathogen-associated signals: upon infection by human rhinoviruses 14 and 16 (HRV-14 and HRV-16), NLRP1 is cleaved and activated which triggers NLRP1-dependent inflammasome activation and IL18 secretion (PubMed:33093214). Positive-strand RNA viruses, such as Semliki forest virus and long dsRNA activate the NLRP1 inflammasome, triggering IL1B release in a NLRP1-dependent fashion (PubMed:33243852). Acts as a direct sensor for long dsRNA and thus RNA virus infection (PubMed:33243852). May also be activated by muramyl dipeptide (MDP), a fragment of bacterial peptidoglycan, in a NOD2-dependent manner (PubMed:18511561). The NLRP1 inflammasome is also activated in response to UV-B irradiation causing ribosome collisions: ribosome collisions cause phosphorylation and activation of NLRP1 in a MAP3K20-dependent manner, leading to pyroptosis (PubMed:35857590) Constitutes the precursor of the NLRP1 inflammasome, which mediates autoproteolytic processing within the FIIND domain to generate the N-terminal and C-terminal parts, which are associated non-covalently in absence of pathogens and other damage-associated signals Regulatory part that prevents formation of the NLRP1 inflammasome: in absence of pathogens and other damage-associated signals, interacts with the C-terminal part of NLRP1 (NACHT, LRR and PYD domains-containing protein 1, C-terminus), preventing activation of the NLRP1 inflammasome (PubMed:33093214). In response to pathogen-associated signals, this part is ubiquitinated and degraded by the proteasome, releasing the cleaved C-terminal part of the protein, which polymerizes and forms the NLRP1 inflammasome (PubMed:33093214) Constitutes the active part of the NLRP1 inflammasome (PubMed:33093214, PubMed:33731929, PubMed:33731932). In absence of pathogens and other damage-associated signals, interacts with the N-terminal part of NLRP1 (NACHT, LRR and PYD domains-containing protein 1, N-terminus), preventing activation of the NLRP1 inflammasome (PubMed:33093214). In response to pathogen-associated signals, the N-terminal part of NLRP1 is degraded by the proteasome, releasing this form, which polymerizes and associates with PYCARD/ASC to form of the NLRP1 inflammasome complex: the NLRP1 inflammasome complex then directly recruits pro-caspase-1 (proCASP1) and promotes caspase-1 (CASP1) activation, leading to gasdermin-D (GSDMD) cleavage and subsequent pyroptosis (PubMed:33093214) It is unclear whether is involved in inflammasome formation. It is not cleaved within the FIIND domain, does not assemble into specks, nor promote IL1B release (PubMed:22665479). However, in an vitro cell-free system, it has been shown to be activated by MDP (PubMed:17349957)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9C000/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NLRP1","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NLRP1","total_profiled":1310},"omim":[{"mim_id":"620331","title":"HATIPOGLU IMMUNODEFICIENCY SYNDROME; HATIS","url":"https://www.omim.org/entry/620331"},{"mim_id":"618803","title":"RESPIRATORY PAPILLOMATOSIS, JUVENILE RECURRENT, CONGENITAL; JRRP","url":"https://www.omim.org/entry/618803"},{"mim_id":"617388","title":"AUTOINFLAMMATION WITH ARTHRITIS AND DYSKERATOSIS; AIADK","url":"https://www.omim.org/entry/617388"},{"mim_id":"617237","title":"IMMUNODEFICIENCY 49, SEVERE COMBINED; IMD49","url":"https://www.omim.org/entry/617237"},{"mim_id":"615225","title":"PALMOPLANTAR CARCINOMA, MULTIPLE SELF-HEALING; MSPC","url":"https://www.omim.org/entry/615225"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NLRP1"},"hgnc":{"alias_symbol":["KIAA0926","DKFZp586O1822","CARD7","NAC","CLR17.1","DEFCAP","VAMAS1"],"prev_symbol":["NALP1","SLEV1"]},"alphafold":{"accession":"Q9C000","domains":[{"cath_id":"1.10.533.10","chopping":"6-31_49-89","consensus_level":"high","plddt":81.2833,"start":6,"end":89},{"cath_id":"3.40.50.300","chopping":"282-289_310-420_429-482","consensus_level":"high","plddt":81.2467,"start":282,"end":482},{"cath_id":"-","chopping":"486-640_648-710","consensus_level":"medium","plddt":83.1068,"start":486,"end":710},{"cath_id":"3.80.10.10","chopping":"812-985","consensus_level":"high","plddt":91.4616,"start":812,"end":985},{"cath_id":"2.60.220,2.60.220","chopping":"1080-1225","consensus_level":"high","plddt":81.3379,"start":1080,"end":1225},{"cath_id":"2.60.40.2660","chopping":"1231-1355","consensus_level":"high","plddt":83.8094,"start":1231,"end":1355},{"cath_id":"1.10.533.10","chopping":"1382-1464","consensus_level":"high","plddt":83.2211,"start":1382,"end":1464}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9C000","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9C000-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9C000-F1-predicted_aligned_error_v6.png","plddt_mean":68.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NLRP1","jax_strain_url":"https://www.jax.org/strain/search?query=NLRP1"},"sequence":{"accession":"Q9C000","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9C000.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9C000/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9C000"}},"corpus_meta":[{"pmid":"26939933","id":"PMC_26939933","title":"The 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In vitro co-immunoprecipitation showed DEFCAP-L and -S interact with caspase-2 (strong) and caspase-9 (weak). Overexpression of full-length DEFCAP-L (but not -S) induced apoptosis in MCF7 cells; deletion mutagenesis showed the LRR/CARD fragment is constitutively active and killing is blocked by caspase inhibitors, indicating the CARD is critical for apoptosis-inducing activity.\",\n      \"method\": \"Co-immunoprecipitation, transient overexpression, deletion mutagenesis, cell death reporter assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and deletion mutagenesis in single lab, multiple orthogonal methods\",\n      \"pmids\": [\"11076957\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"NLRP1 and CARD8 undergo autoproteolytic cleavage at a conserved SF/S motif within the FIIND domain. Bioinformatics revealed structural similarity to the ZU5-UPA domain of PIDD. Site-directed mutagenesis showed the second serine of the SF/S motif is required for autoproteolysis; conserved glutamic acid and histidine residues nearby also regulate cleavage efficiency.\",\n      \"method\": \"Bioinformatics/structural modeling, site-directed mutagenesis, autoproteolysis assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis with structural modeling, multiple mutants tested, mechanistic mechanism confirmed\",\n      \"pmids\": [\"22087307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NLRP1 knockout mice demonstrated that the NLRP1 inflammasome is required for anthrax lethal toxin-triggered caspase-1 activation, IL-1β release, and pyroptotic cell death. This cell death escalates to cause acute lung injury independent of IL-1β production but dependent on caspase-1. Muramyl dipeptide-mediated inflammasome formation was not dependent on NLRP1 but on NLRP3.\",\n      \"method\": \"NLRP1 knockout mouse, anthrax lethal toxin challenge, caspase-1 activity assay, IL-1β measurement, lung injury model\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout mouse with defined molecular and cellular phenotypes, replicated across in vitro and in vivo\",\n      \"pmids\": [\"22753929\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NLRP1 haplotypes associated with autoimmune disease (sharing L155H and M1184V substitutions) cause increased processing of pro-IL-1β to mature IL-1β under basal and TLR-stimulated conditions in primary human monocytes, without altering NLRP1 RNA or protein levels, indicating that the multivariant polypeptide itself has altered function.\",\n      \"method\": \"Primary human monocyte functional assay, IL-1β ELISA, genotyping\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional assay in primary human cells, single lab, replicated across 3-month period\",\n      \"pmids\": [\"23382179\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Transcription factor ATF4 directly binds the NLRP1 promoter during ER stress and upregulates NLRP1 expression. Both IRE1α and PERK pathways (but not ATF6) modulate NLRP1 gene expression. This was established by mutagenesis, chromatin immunoprecipitation, and CRISPR-Cas9-mediated genome editing.\",\n      \"method\": \"ChIP, promoter mutagenesis, CRISPR-Cas9 genome editing, qRT-PCR\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal methods (ChIP, mutagenesis, CRISPR) in single lab establish direct transcriptional regulation\",\n      \"pmids\": [\"26086088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Mice lacking NLRP1 phenocopy IL-18 knockout mice, exhibiting spontaneous obesity and metabolic syndrome due to intrinsic lipid accumulation. Mice with an activating NLRP1 mutation have decreased adiposity and increased plasma IL-18. Genetic deletion of IL-18 prevents the fatal cachexia caused by NLRP1 hyperactivation on high-fat diet, placing NLRP1 upstream of IL-18 in metabolic regulation.\",\n      \"method\": \"NLRP1 knockout and knock-in mouse models, metabolic phenotyping, genetic epistasis (IL-18 deletion rescue)\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with multiple mouse models and IL-18 rescue experiment in single rigorous study\",\n      \"pmids\": [\"26603191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Proteasome-mediated degradation of the NLRP1B N-terminal fragment is both necessary and sufficient for NLRP1B activation. Anthrax lethal toxin cleavage triggers this degradation, liberating the C-terminal fragment as a potent caspase-1 activator. Shigella flexneri ubiquitin ligase IpaH7.8 also induces NLRP1B degradation and activation by the same mechanism, establishing 'functional degradation' as a unified activation mechanism.\",\n      \"method\": \"Proteasome inhibitor studies, reconstitution assays, epistasis with IpaH7.8 (Shigella effector), caspase-1 activation assay\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal approaches (genetic, pharmacologic, reconstitution) across two different activating enzymes, published in Science\",\n      \"pmids\": [\"30872533\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"DPP9 was identified as an endogenous inhibitor of the human NLRP1 inflammasome via proteomics screen. DPP9 interacts with the FIIND domain of NLRP1. Its scaffolding function and catalytic activity act synergistically to maintain NLRP1 in an inactive state. A patient-derived germline missense mutation in the NLRP1 FIIND domain abrogates DPP9 binding and leads to inflammasome hyperactivation.\",\n      \"method\": \"Proteomics screen, Co-IP, CRISPR/Cas9 deletion, DPP8/9 small molecule inhibition, ASC speck formation assay, IL-1β secretion assay, mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (proteomics, Co-IP, CRISPR, chemical biology), patient mutation validation, published in JBC\",\n      \"pmids\": [\"30291141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DPP8/9 inhibitors (e.g., Val-boroPro) activate all functional rodent NLRP1 alleles. NLRP1 allele sensitivities to DPP8/9 inhibitor-induced and Toxoplasma gondii-induced pyroptosis are strikingly similar, suggesting DPP8/9 inhibition phenocopies a key T. gondii activity.\",\n      \"method\": \"Pyroptosis assays across multiple rodent NLRP1 alleles, DPP8/9 inhibitor treatment, T. gondii infection comparison\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — allele panel screen and parallel stimuli comparison in single lab\",\n      \"pmids\": [\"31383852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Human NLRP1 directly binds double-stranded RNA through its leucine-rich repeat domain, and this interaction causes the NACHT domain to gain ATPase activity. SFV replication and dsRNA formation are required to engage the NLRP1 inflammasome; delivery of long dsRNA alone is sufficient to trigger activation.\",\n      \"method\": \"Biochemical binding assays, ATPase activity assay, mutagenesis of LRR domain, viral infection model, dsRNA transfection\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — biochemical reconstitution showing direct dsRNA binding to LRR domain plus gain of ATPase activity, with genetic validation in Science\",\n      \"pmids\": [\"33243852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Enteroviral 3C proteases directly cleave human NLRP1 at a single site (Glu130-Gly131), triggering N-glycine-mediated degradation of the autoinhibitory N-terminal fragment via the cullin-ZER1/ZYG11B complex. This liberates the activating C-terminal fragment, leading to inflammasome activation and IL-18 secretion in primary human airway epithelial cells.\",\n      \"method\": \"In vitro protease cleavage assay, N-degron pathway genetic manipulation (cullin-ZER1/ZYG11B), primary human airway epithelial cell infection, IL-18 ELISA\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro cleavage mapped to single site, N-degron pathway validated genetically, functional readout in primary cells, Science publication\",\n      \"pmids\": [\"33093214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cryo-EM structures of the human NLRP1-DPP9 complex reveal a ternary complex comprising DPP9, full-length NLRP1, and the NLRP1 C-terminal fragment (CT). DPP9 sequesters the NLRP1 CT only when full-length NLRP1 is present, suggesting activation is regulated by the ratio of CT to full-length NLRP1. The N-terminus of the NLRP1 CT inserts into the DPP9 active site; Val-boroPro (VbP) disrupts this interaction and accelerates N-terminal fragment degradation.\",\n      \"method\": \"Cryo-EM structure determination, cell-based inflammasome activation assays, co-expression rescue experiments, VbP inhibitor co-structure\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution cryo-EM with functional validation in cells, mechanistic model confirmed by inhibitor co-structure, Nature publication\",\n      \"pmids\": [\"33731932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cryo-EM/biochemical structures of rat NLRP1-DPP9 show a 2:1 complex containing autoinhibited full-length NLRP1 and an active UPA-CARD fragment. The ZU5 domain is required for both NLRP1 autoinhibition and assembly of the 2:1 complex. Complex formation prevents UPA-mediated higher-order oligomerization of UPA-CARD fragments and strengthens ZU5-mediated autoinhibition. Both NLRP1 binding and DPP9 enzymatic activity are required to suppress NLRP1 in human cells.\",\n      \"method\": \"Cryo-EM, biochemical reconstitution, structure-guided mutagenesis, cell-based functional assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — structure plus mutagenesis plus functional assays in single comprehensive study, Nature publication\",\n      \"pmids\": [\"33731929\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cryo-EM structures of NLRP1-CT and CARD8-CT assemblies show that CARDs form central helical filaments promoted by oligomerized but flexibly-linked UPAs. NLRP1-CARD filaments drive ASC speck formation; NLRP1-FIINDUPA enhances oligomerization. An exterior CARD dimerization doubles NLRP1CARD filament thickness uniquely among known CARD filaments. ASC uses opposing surfaces to recruit NLRP1 vs. caspase-1.\",\n      \"method\": \"Cryo-EM (3.7 Å), biochemical reconstitution, cell-based ASC speck formation assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — near-atomic resolution cryo-EM with biochemical and cell-based validation\",\n      \"pmids\": [\"33420033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The activating domains (FIINDUPA-CARD) of NLRP1 self-oligomerize to form a two-layered filament with an inner CARD core surrounded by an outer FIINDUPA ring. Self-assembled NLRP1-CARD filaments drive ASC speck formation in human cells, and NLRP1-FIINDUPA oligomers greatly enhance this. Structural differences in NLRP1-CARD vs. CARD8-CARD enable selective recruitment of ASC vs. pro-caspase-1, respectively.\",\n      \"method\": \"Cryo-EM (3.7 Å), recombinant protein reconstitution, cell-based ASC speck assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — structural and biochemical reconstitution with cell validation, orthogonal to companion paper\",\n      \"pmids\": [\"33420028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Diverse viral proteases from picornaviruses cleave human NLRP1 within a rapidly evolving 'tripwire' region, leading to host-specific and virus-specific activation of the NLRP1 inflammasome. The mechanism parallels anthrax LeTx-driven NLRP1B degradation; cleavage leads to N-terminal degradation and liberation of the bioactive C-terminal domain.\",\n      \"method\": \"Protease cleavage assays, inflammasome activation assays, evolutionary analysis of cleavage sites\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro cleavage and cell-based activation across multiple viral proteases, mechanistic follow-up with epistasis\",\n      \"pmids\": [\"33410748\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"KSHV ORF45 protein activates human NLRP1 inflammasome independently of proteolytic cleavage, by binding the Linker1 region (between PYD and NACHT domains). At steady state, Linker1 interacts with the UPA subdomain to silence NLRP1 in auto-inhibitory complexes independent of DPP9. ORF45 binding to Linker1 displaces UPA from the Linker1-UPA complex, releasing the C-terminal domain for inflammasome assembly. This activation mechanism is conserved in primates but not murine NLRP1b.\",\n      \"method\": \"Co-IP, domain mutagenesis, inflammasome activation assays, species comparison\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mechanistic domain mapping with Co-IP, mutagenesis, and cell-based activation assays identifying a non-protease activation pathway\",\n      \"pmids\": [\"35618833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Human NLRP1 senses the ribotoxic stress response (RSR) triggered by UVB and ribotoxins. ZAKα kinase and its downstream effector p38 directly hyperphosphorylate a human-specific disordered linker region (NLRP1DR). Mutating a single ZAKα phosphorylation site in NLRP1DR abrogates UVB- and ribotoxin-driven pyroptosis in keratinocytes. Fusing NLRP1DR to CARD8 (which is insensitive to RSR) creates a minimal RSR sensor, confirming NLRP1DR is sufficient.\",\n      \"method\": \"Kinase activity assay, site-directed mutagenesis, domain-swap experiment (NLRP1DR-CARD8), ZAKα/p38 knockout/inhibition, pyroptosis assay\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis identifying key phosphorylation site, domain-swap reconstitution, kinase cascade validated, Science publication\",\n      \"pmids\": [\"35857590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"p38 MAPK directly phosphorylates NLRP1; serine 107 in the linker region is critical for activation by ribotoxic stress and alphavirus infection. This phosphorylation is followed by ubiquitination of NLRP1 PYD, N-terminal degradation, and inflammasome nucleation. Activation by nanobody-mediated ubiquitination, viral proteases, or DPP9 inhibition was independent of p38 activity, establishing p38 as a specific signaling hub for stress-induced activation.\",\n      \"method\": \"Kinase assay, site-directed mutagenesis (S107), ubiquitination assay, pathway epistasis (p38 inhibitors, ZAKα KO), pyroptosis assay\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct kinase phosphorylation at identified residue with mutagenesis, epistasis showing pathway specificity, orthogonal to Robinson et al. 2022\",\n      \"pmids\": [\"36315050\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SARS-CoV-2 3CL protease cleaves human NLRP1 at Q333, triggering inflammasome assembly, cell death, and limitation of infectious viral particle production in human lung epithelial cells. Multiple coronavirus 3CL proteases activate NLRP1 by this mechanism. 3CL proteases also inactivate Gasdermin D, redirecting pyroptosis to caspase-3/GSDME-mediated alternative pyroptosis.\",\n      \"method\": \"In vitro protease cleavage assay, NLRP1 knockout cell lines, SARS-CoV-2 infection of lung epithelial cells, cytokine secretion, cell death assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cleavage site mapped, NLRP1 KO epistasis, infection model, multiple coronaviruses tested\",\n      \"pmids\": [\"35594856\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Diphtheria toxin activates ribotoxic stress response via ZAKα/p38-driven hyperphosphorylation of NLRP1, triggering NLRP1 inflammasome-dependent IL-1β and IL-18 secretion in primary human keratinocytes. NLRP1 deletion abrogates cytokine secretion. ZAKα inhibition was more protective than caspase-1 inhibition in a 3D skin model of cutaneous diphtheria, demonstrating ZAKα functions both upstream of NLRP1 and in non-inflammasome cell death.\",\n      \"method\": \"NLRP1 and ZAKα knockout/inhibition, cytokine assay, 3D skin model, pharmacologic ZAKα and caspase-1 inhibition\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO epistasis and pharmacologic inhibition in physiologically relevant 3D model, mechanistic pathway placement established\",\n      \"pmids\": [\"37642997\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Poly(dA:dT) activates the NLRP1 inflammasome in human keratinocytes via oxidative nucleic acid damage and cellular stress that activates MAP3 kinases including ZAKα converging on p38, rather than through dsRNA intermediates or AIM2/cGAS-STING-NLRP3 pathways. Conventional linear dsDNA fails to activate NLRP1.\",\n      \"method\": \"NLRP1 knockout, AIM2 and cGAS-STING pathway genetic ablation, ZAKα/p38 inhibitor treatment, caspase-1 activation assay, cytokine secretion\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis ruling out alternative pathways combined with pathway inhibitor evidence, defining mechanism\",\n      \"pmids\": [\"36693106\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Several agents that interfere with protein folding (aminopeptidase inhibitors, chaperone inhibitors, unfolded protein response inducers) accelerate NLRP1 N-terminal fragment degradation. However, the released CT fragments are sequestered by DPP9 and do not form inflammasomes unless DPP9-binding ligands are also present to disrupt CT-DPP9 complexes. This demonstrates NLRP1 detects a specific perturbation involving both protein folding stress and DPP9 ligand accumulation.\",\n      \"method\": \"Protein folding stress inducers, proteasome assay, DPP9 binding/displacement assay, inflammasome activation assay\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple agents tested, DPP9 sequestration mechanism confirmed biochemically, single lab\",\n      \"pmids\": [\"36649711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Nigericin activates the NLRP1 inflammasome in human keratinocytes via potassium efflux-dependent inhibition of ribosome elongation, activating RSR sensor kinase ZAKα and downstream p38/JNK, and hyperphosphorylating the NLRP1 linker domain. Extracellular K+ supplementation, ZAKα knockout, or ZAKα/p38 inhibitors block nigericin-induced NLRP1 pyroptosis. Greater K+ depletion is required to activate ZAKα-NLRP1 than NLRP3.\",\n      \"method\": \"K+ manipulation, ZAKα knockout, pharmacologic ZAKα/p38 inhibition, ionophore panel screen, pyroptosis assay, NLRP1 phosphorylation assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal genetic and chemical interventions, quantitative comparison of K+ thresholds, mechanism fully established\",\n      \"pmids\": [\"38175865\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In rat macrophages, Toxoplasma gondii activates the NLRP1 inflammasome to induce pyroptosis, IL-1β/IL-18 processing, and inhibition of parasite proliferation. Knockdown of Nlrp1 in pyroptosis-sensitive macrophages resulted in higher parasite replication and protection from cell death; overexpression of the NLRP1 variant from sensitive macrophages in resistant cells sensitized them to pyroptosis.\",\n      \"method\": \"NLRP1 knockdown (siRNA), NLRP1 overexpression (allele transfer), T. gondii infection, pyroptosis/cytokine assay\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — bidirectional genetic manipulation (KD and OE), defined cellular phenotype, mechanistic pathway placement\",\n      \"pmids\": [\"24626226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Heme oxygenase-1 (HO-1) suppresses NLRP1 inflammasome-induced neuronal death after spinal cord injury by inhibiting expression of activating transcription factor 4 (ATF4), a transcription factor that regulates NLRP1 expression. This was demonstrated by immunoprecipitation showing NLRP1 inflammasome formation in spinal cord neurons, and by AAV-mediated HO-1 overexpression reducing NLRP1 expression and neuronal death in vivo and in vitro.\",\n      \"method\": \"AAV-mediated HO-1 overexpression, immunoprecipitation (NLRP1 complex), ATF4 expression analysis, neuronal death quantification\",\n      \"journal\": \"Journal of neuroinflammation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of complex and in vivo gain-of-function, single lab, mechanism linked to ATF4 pathway\",\n      \"pmids\": [\"26925775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NLRP1 interacts with mTOR by co-immunoprecipitation in hippocampal neurons; chronic social defeat stress facilitates this interaction and promotes autophagy impairment. Nlrp1a knockdown inhibited PI3K/AKT/mTOR signaling, rescued impaired autophagy, and ameliorated depressive-like behaviors. Rapamycin (mTOR inhibitor/autophagy inducer) abolished NLRP1 inflammasome-driven inflammation.\",\n      \"method\": \"Co-immunoprecipitation (NLRP1-mTOR), AAV-mediated Nlrp1a knockdown, rapamycin treatment, western blot, behavioral assays\",\n      \"journal\": \"Journal of neuroinflammation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP showing NLRP1-mTOR interaction plus KD epistasis, single lab, mechanistic pathway placement\",\n      \"pmids\": [\"38178196\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In a mouse model of endometriosis, Schwann cell C5aR1 activates the NLRP1 inflammasome, leading to IL-1β release. Silencing C5aR1 in Schwann cells blocked C5a-induced NLRP1 inflammasome activation. IL-1β from Schwann cells recruits macrophages to peripheral nerves, increases oxidative stress, and activates TRPA1, causing widespread pain.\",\n      \"method\": \"C5aR1 siRNA silencing in Schwann cells, NLRP1 inflammasome activation assay, IL-1β measurement, macrophage recruitment assay, pain behavior in mouse model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic silencing with defined cellular pathway in mouse model, single lab\",\n      \"pmids\": [\"39587068\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ZAKα/p38 kinase signaling activates the NLRP1 inflammasome in the context of erythroid differentiation, causing ribosomal stress-mediated NLRP1 phosphorylation and assembly. LRRFIP1 and FLII were identified as endogenous inhibitors of the NLRP1 inflammasome in hematopoietic cells, acting independently of DPP9. Genetic inhibition of Nlrp1 in zebrafish reduced neutrophils and increased erythrocytes.\",\n      \"method\": \"Zebrafish nlrp1 genetic inhibition, identification of LRRFIP1/FLII as NLRP1 inhibitors by interaction studies, ZAKα/p38 phosphorylation assay, hematopoietic differentiation assay\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in zebrafish and human cells, new inhibitory binding partners identified, single lab\",\n      \"pmids\": [\"37675820\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Human NLRP1 is an innate immune sensor that is maintained in an inactive state through autoproteolytic cleavage within its FIIND domain (generating non-covalently associated ZU5 and UPA-CARD fragments) and sequestration of its activating C-terminal fragment by a DPP9-containing inhibitory complex; diverse pathogen-derived enzymatic activities (anthrax lethal toxin, enteroviral and coronavirus 3C proteases, Shigella IpaH7.8 ubiquitin ligase) or cellular stress signals (dsRNA binding to the LRR domain, ribotoxic stress via ZAKα/p38-mediated phosphorylation of a human-specific disordered linker, potassium efflux) trigger N-terminal fragment degradation via the ubiquitin-proteasome system and N-degron pathway, liberating the C-terminal UPA-CARD fragment to oligomerize into a filamentous inflammasome platform that recruits ASC and activates caspase-1, leading to IL-1β/IL-18 maturation and pyroptotic cell death.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"NLRP1 is an innate immune sensor that nucleates an inflammasome platform to drive caspase-1-dependent maturation of IL-1β/IL-18 and pyroptotic cell death in response to diverse pathogen activities and cellular stresses [#2, #6]. The receptor is held inactive by two coupled mechanisms: constitutive autoproteolysis within its FIIND domain at a conserved SF/S motif generating non-covalently associated fragments [#1], and sequestration of the activating C-terminal fragment by DPP9, whose scaffolding and catalytic activities synergize to maintain autoinhibition [#7]. Cryo-EM of the NLRP1–DPP9 ternary complex shows DPP9 captures the C-terminal fragment only in the presence of full-length NLRP1, with the CT N-terminus inserting into the DPP9 active site, so that activation is set by the ratio of free CT to full-length protein [#11, #12]. Activation converges on 'functional degradation': proteasomal destruction of the autoinhibitory N-terminal fragment is necessary and sufficient to liberate the C-terminal UPA-CARD fragment, which oligomerizes into a two-layered filament with an inner CARD core that recruits ASC and templates caspase-1 activation [#6, #13, #14]. This degradation is triggered by pathogen enzymes that cleave NLRP1 within a rapidly evolving 'tripwire' region—anthrax lethal toxin and the Shigella ubiquitin ligase IpaH7.8 [#6], enteroviral 3C proteases cleaving at Glu130-Gly131 to expose an N-glycine degron processed by cullin-ZER1/ZYG11B [#10, #15], and coronavirus 3CL proteases cleaving at Q333 [#19]—or by direct sensing: dsRNA binding to the LRR domain confers NACHT ATPase activity [#9], and a human-specific disordered linker is hyperphosphorylated at Ser107 by ZAKα/p38 during ribotoxic stress from UVB, ribotoxins, potassium efflux, and oxidative nucleic acid damage [#17, #18, #23]. Patient-derived FIIND mutations that abrogate DPP9 binding and autoimmune-associated haplotypes cause inflammasome hyperactivation [#7, #3], and NLRP1 acts upstream of IL-18 to control systemic metabolism [#5].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established NLRP1 as a multidomain Ced-4-family protein with a CARD capable of engaging caspases and triggering cell death, framing it as a death-signaling scaffold before its inflammasome role was known.\",\n      \"evidence\": \"Co-immunoprecipitation, deletion mutagenesis, and cell death reporter assays in MCF7 cells\",\n      \"pmids\": [\"11076957\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Caspase-2/-9 interactions did not establish the physiological caspase-1/IL-1β axis\", \"Overexpression apoptosis may not reflect endogenous function\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified FIIND autoproteolysis at the SF/S motif as a constitutive processing event, revealing the structural basis for the two-fragment architecture central to NLRP1 regulation.\",\n      \"evidence\": \"Bioinformatic ZU5-UPA modeling and site-directed mutagenesis with autoproteolysis assays\",\n      \"pmids\": [\"22087307\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of cleavage for activation not yet defined\", \"Did not establish how the cleaved fragments are kept inactive\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined the NLRP1 inflammasome in vivo as required for anthrax lethal toxin-triggered caspase-1 activation, IL-1β release, and pyroptosis-driven lung injury, distinguishing it from NLRP3.\",\n      \"evidence\": \"NLRP1 knockout mice with lethal toxin challenge and lung injury model\",\n      \"pmids\": [\"22753929\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which lethal toxin activates NLRP1 not yet resolved\", \"Mouse NLRP1B vs human NLRP1 differences unaddressed\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed Toxoplasma gondii activates rodent NLRP1 to restrict parasite replication, linking allelic variation to pyroptosis sensitivity and establishing a pathogen sensing role.\",\n      \"evidence\": \"Nlrp1 knockdown and allele-transfer overexpression with T. gondii infection in rat macrophages\",\n      \"pmids\": [\"24626226\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular trigger from T. gondii not identified\", \"Allelic determinants of sensitivity not mapped to specific residues\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Connected NLRP1 to transcriptional control during ER stress (ATF4-driven induction) and to systemic metabolism, placing NLRP1 upstream of IL-18 in adiposity regulation.\",\n      \"evidence\": \"ChIP/promoter mutagenesis/CRISPR for ATF4 regulation; knockout/knock-in mouse metabolic phenotyping with IL-18 epistasis rescue\",\n      \"pmids\": [\"26086088\", \"26603191\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanistic link between ER stress transcription and inflammasome assembly unclear\", \"How IL-18 mediates metabolic effects not detailed\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified DPP9 as an endogenous brake whose scaffolding and catalytic functions maintain NLRP1 inactivity, with patient mutations losing DPP9 binding causing hyperactivation.\",\n      \"evidence\": \"Proteomics, Co-IP, CRISPR deletion, DPP8/9 inhibition, and patient mutation validation\",\n      \"pmids\": [\"30291141\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of DPP9 sequestration not yet resolved\", \"How DPP9 release couples to fragment liberation unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Unified NLRP1 activation under 'functional degradation', showing proteasomal destruction of the N-terminal fragment is necessary and sufficient to release the C-terminal activator across distinct triggers.\",\n      \"evidence\": \"Proteasome inhibition, reconstitution, and IpaH7.8 epistasis with caspase-1 readouts; DPP8/9 inhibitor allele panel and T. gondii comparison\",\n      \"pmids\": [\"30872533\", \"31383852\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitin ligases for each trigger not all identified\", \"Degron features driving degradation incompletely mapped\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Distinguished direct sensing (dsRNA binding to LRR conferring NACHT ATPase activity) from protease-driven N-degron activation, establishing the LRR and the tripwire as parallel input modules.\",\n      \"evidence\": \"Biochemical dsRNA binding and ATPase assays with viral infection; enteroviral 3C cleavage mapping to Glu130-Gly131 with cullin-ZER1/ZYG11B genetics in primary airway cells\",\n      \"pmids\": [\"33243852\", \"33093214\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How dsRNA-induced ATPase activity leads to fragment release not resolved\", \"Whether both inputs converge on identical downstream filament unaddressed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Cryo-EM of NLRP1–DPP9 complexes and the C-terminal filament revealed the structural logic of autoinhibition (CT sequestration requiring full-length NLRP1, ZU5-dependent assembly) and activation (CARD filament templating ASC recruitment).\",\n      \"evidence\": \"Cryo-EM of human/rat NLRP1-DPP9 ternary complexes with VbP co-structure; cryo-EM of NLRP1-CT/FIINDUPA-CARD assemblies with ASC speck assays\",\n      \"pmids\": [\"33731932\", \"33731929\", \"33420033\", \"33420028\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dynamics of CT release from DPP9 in cells not directly visualized\", \"Stoichiometry of in vivo filament assembly uncertain\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extended viral activation to a broad picornaviral protease tripwire and identified a protease-independent route via KSHV ORF45 disrupting a Linker1-UPA autoinhibitory interface, revealing DPP9-independent silencing.\",\n      \"evidence\": \"Protease cleavage and inflammasome assays with evolutionary analysis; Co-IP and domain mutagenesis for ORF45-Linker1 with species comparison\",\n      \"pmids\": [\"33410748\", \"35618833\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full set of host targets within the evolving tripwire not enumerated\", \"Relationship between Linker1-UPA silencing and DPP9 sequestration unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined the ribotoxic stress response as a sensing pathway in which ZAKα/p38 hyperphosphorylate a human-specific disordered linker (Ser107), with the linker sufficient to confer RSR sensitivity and feeding into ubiquitination and N-terminal degradation.\",\n      \"evidence\": \"Kinase assays, S107 mutagenesis, NLRP1DR-CARD8 domain swap, ZAKα/p38 knockout/inhibition; ubiquitination and pathway epistasis with pyroptosis readouts\",\n      \"pmids\": [\"35857590\", \"36315050\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitin ligase recognizing phosphorylated NLRP1 not identified\", \"How phosphorylation triggers N-terminal degradation mechanistically unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established coronavirus 3CL proteases as NLRP1 activators (cleaving at Q333) that also inactivate Gasdermin D to redirect cell death to caspase-3/GSDME pyroptosis, integrating NLRP1 into antiviral defense and viral counter-strategies.\",\n      \"evidence\": \"In vitro cleavage mapping, NLRP1 knockout cells, SARS-CoV-2 infection of lung epithelia, multiple coronavirus proteases\",\n      \"pmids\": [\"35594856\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo relevance to COVID-19 pathology not established here\", \"Balance between GSDMD and GSDME outcomes context-dependent\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Generalized RSR-driven NLRP1 activation to diverse stressors (diphtheria toxin, oxidative DNA damage from poly(dA:dT), protein folding stress) all converging on ZAKα/p38 or coupled to DPP9 ligand accumulation, defining NLRP1 as an integrator of ribosomal and proteostatic stress.\",\n      \"evidence\": \"NLRP1/ZAKα knockout and inhibitor studies in keratinocytes and 3D skin; pathway-exclusion genetics; protein folding stress inducers with DPP9 displacement assays\",\n      \"pmids\": [\"37642997\", \"36693106\", \"36649711\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Precise upstream lesion sensed by ZAKα across stressors not unified\", \"Quantitative thresholds linking stress to activation undefined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed potassium efflux activates NLRP1 indirectly through ribosome elongation inhibition and ZAKα/p38, distinguishing the K+ threshold for NLRP1 from NLRP3 and tying ionic perturbation to the RSR sensing axis.\",\n      \"evidence\": \"K+ manipulation, ZAKα knockout, ZAKα/p38 inhibition, ionophore screen, phosphorylation and pyroptosis assays in keratinocytes\",\n      \"pmids\": [\"38175865\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link between K+ loss and ribosome stalling not fully defined\", \"Cell-type specificity of K+-NLRP1 coupling unaddressed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Implicated NLRP1 in tissue-specific disease and homeostatic contexts—Schwann cell C5aR1-NLRP1 in pain, NLRP1-mTOR in stress-related depression, and ZAKα/p38-NLRP1 with LRRFIP1/FLII inhibitors in hematopoiesis—broadening its physiological footprint.\",\n      \"evidence\": \"C5aR1 silencing and pain behavior; NLRP1-mTOR Co-IP and Nlrp1a knockdown with rapamycin; zebrafish nlrp1 inhibition and LRRFIP1/FLII interaction studies\",\n      \"pmids\": [\"39587068\", \"38178196\", \"37675820\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"These tissue contexts rely largely on single labs and rodent/zebrafish models\", \"Direct NLRP1-mTOR interaction not structurally validated\", \"LRRFIP1/FLII inhibitory mechanism not mechanistically resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The complete set of ubiquitin ligases and degron-recognition machinery linking each upstream trigger (phosphorylation, cleavage, dsRNA) to N-terminal fragment degradation remains incompletely defined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trigger-specific E3 ligases not all identified\", \"How distinct inputs funnel into a common degradation outcome not unified\", \"Structural snapshot of the activating transition in cells lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [1, 6]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [13, 14]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [2, 6, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [11, 14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [2, 6, 19]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [2, 14, 19]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [17, 21, 23]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [3, 7]}\n    ],\n    \"complexes\": [\"NLRP1 inflammasome\", \"NLRP1-DPP9 inhibitory complex\"],\n    \"partners\": [\"DPP9\", \"ASC\", \"CASP1\", \"ZAK\", \"MAPK14\", \"ATF4\", \"LRRFIP1\", \"FLII\"],\n    \"other_free_text\": []\n  }\n}\n```","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}