{"gene":"STAMBP","run_date":"2026-06-10T07:46:42","timeline":{"discoveries":[{"year":2004,"finding":"AMSH (STAMBP) is a ubiquitin isopeptidase with activity against K48-linked tetraubiquitin and K63-linked polyubiquitin chains in vitro. An inactivating mutation (D348A) causes accumulation of ubiquitin on endosomes and stabilization of ubiquitinated STAM. AMSH knockdown enhances EGFR degradation rate, and ubiquitinated EGFR serves as an in vitro substrate.","method":"In vitro isopeptidase assay, active-site mutagenesis (D348A), siRNA knockdown, immunofluorescence","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro enzymatic assay with active-site mutagenesis, multiple orthogonal methods, foundational study replicated across many subsequent papers","pmids":["15314065"],"is_preprint":false},{"year":2006,"finding":"AMSH is activated by coincubation with STAM, showing marked stimulation of K63-linked polyubiquitin chain cleavage in vitro. AMSH directly binds clathrin and ESCRT-III component mVps24/CHMP3; simultaneous STAM binding reinforces the CHMP3 interaction. These interactions embed AMSH within the MVB-sorting machinery.","method":"In vitro enzymatic assay with purified components, direct binding assays, Co-IP","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of activation with purified proteins, multiple binding partners confirmed, single lab with orthogonal methods","pmids":["16431367"],"is_preprint":false},{"year":1999,"finding":"AMSH (STAMBP) was identified as a novel molecule interacting with the SH3 domain of STAM. A dominant-negative C-terminal deletion mutant of AMSH inhibits IL-2- and GM-CSF-mediated signaling for DNA synthesis and c-myc induction, placing AMSH downstream of the Jak2/Jak3·STAM complex.","method":"Yeast two-hybrid, dominant-negative mutant overexpression, cell proliferation and signaling assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid binding plus dominant-negative functional readout, single lab","pmids":["10383417"],"is_preprint":false},{"year":2006,"finding":"AMSH interacts with ESCRT-III subunits CHMP1A, CHMP1B, CHMP2A, and CHMP3. Catalytically inactive AMSH acts as a dominant negative, inhibiting retroviral budding and causing accumulation of ubiquitinated endosomal cargo. VPS4 and AMSH compete for binding to C-terminal regions of CHMP1A and CHMP1B.","method":"Co-IP, dominant-negative overexpression, retroviral budding assay, competition binding assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal interaction mapping, functional dominant-negative readout, single lab with multiple orthogonal methods","pmids":["16760479"],"is_preprint":false},{"year":2007,"finding":"AMSH interacts with CHMP3 (ESCRT-III) in cells; a dominant-negative CHMP3 that prevents AMSH targeting to endosomes inhibits EGFR degradation but not internalization, demonstrating that endosomal localization of AMSH is required for its function in the MVB pathway.","method":"Co-IP, dominant-negative CHMP3 overexpression, EGFR degradation assay, fluorescence microscopy","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional consequence of mislocalization established by dominant-negative, Co-IP, single lab","pmids":["17261583"],"is_preprint":false},{"year":2006,"finding":"AMSH and AMSH-LP are anchored to early endosomes via a novel clathrin-binding site on the terminal domain of clathrin heavy chain. Deletion of this site or RNAi depletion of clathrin heavy chain abolishes endosomal localization of AMSH, whereas loss of STAM-binding does not affect endosomal localization.","method":"RNAi knockdown, deletion mutants, fluorescence co-localization microscopy, fractionation","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiment with functional consequence, multiple complementary approaches, single lab","pmids":["16716190"],"is_preprint":false},{"year":2006,"finding":"AMSH-mediated deubiquitination of endosomal cargo in vivo requires both its catalytic DUB activity and its CHMP3-binding ability; an AMSH mutant lacking CHMP3-binding localizes normally to endosomes but causes accumulation of ubiquitinated cargo, indicating CHMP3 interaction is needed for in vivo substrate access rather than localization or catalytic activity per se.","method":"Mutant overexpression, immunofluorescence, in vitro DUB assay","journal":"Cell structure and function","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dissection of binding vs. catalytic requirements by mutational analysis, single lab","pmids":["17159328"],"is_preprint":false},{"year":2004,"finding":"RNF11 binds AMSH in mammalian cells independently of the RNF11 RING domain and PY motif, and recruits AMSH to the HECT-type E3 ligase Smurf2, which ubiquitinates AMSH leading to its proteasomal degradation.","method":"Yeast two-hybrid, Co-IP in mammalian cells, in vitro ubiquitination assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP binding plus functional ubiquitination assay establishing writer (Smurf2) and adaptor (RNF11), single lab","pmids":["14755250"],"is_preprint":false},{"year":2010,"finding":"AMSH loss-of-function or catalytic inactivity increases basal steady-state CXCR4 levels, and catalytically inactive AMSH causes basal hyperubiquitination of ESCRT-0 components STAM1 and Hrs in an RXXK-motif-dependent manner. The RXXK motif mediates high-affinity interaction with SH3 domains of STAM and Grb2 families.","method":"RNAi knockdown, catalytic mutant overexpression, co-IP, CXCR4 trafficking/degradation assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (RNAi, catalytic mutant, Co-IP), single lab","pmids":["20159979"],"is_preprint":false},{"year":2011,"finding":"Crystal structure of the AMSH catalytic domain (JAMM motif) was determined; the catalytic domain of AMSH is nearly identical to that of AMSH-LP but is thermodynamically less stable. An active-site mutant (E280A) retains zinc coordination via compensatory aspartate repositioning, indicating structural plasticity. A modeled AMSH-diubiquitin complex reveals a distinct distal ubiquitin interface compared to AMSH-LP.","method":"X-ray crystallography, guanidine-HCl unfolding (thermodynamic stability), structural modeling","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with active-site mutagenesis and thermodynamic characterization, single lab with multiple orthogonal methods","pmids":["21888914"],"is_preprint":false},{"year":2011,"finding":"Crystal structure of the AMSH N-terminal fragment in complex with CHMP3 C-terminal region reveals that the AMSH N-terminus folds into an elongated helical assembly containing an unusual MIT domain. CHMP3 is unstructured in solution but forms a helix upon binding AMSH via a novel MIM4 motif with unusually high affinity. The N-terminal helical segment of AMSH has a regulatory role: its destabilization causes loss of function during HIV-1 budding.","method":"X-ray crystallography, ITC, SPR, HIV-1 budding functional assay","journal":"Structure (London, England : 1993)","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure validated by ITC, SPR, and functional assay; multiple orthogonal methods in one study","pmids":["21827950"],"is_preprint":false},{"year":2013,"finding":"Kinetic and mutational analysis established that proximal ubiquitin recognition is critical for AMSH's K63-linkage specificity and catalytic efficiency. The MIC-CAP disease mutation T313I causes substantial loss of catalytic activity without altering thermodynamic stability. STAM activates AMSH by providing its UIM to bind the proximal ubiquitin while AMSH catalytic domain binds the distal ubiquitin, stabilizing the chain in a productive orientation.","method":"Kinetic assays, site-directed mutagenesis, biochemical/biophysical analyses (thermal stability), in vitro reconstitution with purified STAM","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinetic reconstitution with mutagenesis and stability measurements; mechanistic model supported by multiple orthogonal biochemical methods, single lab","pmids":["24151880"],"is_preprint":false},{"year":2001,"finding":"AMSH-deficient mice generated by gene targeting show selective postnatal death of hippocampal CA1 neurons and cerebral cortex atrophy, with AMSH-deficient hippocampal neurons unable to survive in vitro. Neurons from other regions (cerebellum) and other cell types (thymocytes, fibroblasts) survive normally, establishing a tissue-specific essential role for AMSH in neuronal survival.","method":"Gene-targeted knockout mouse, histopathology, in vitro neuronal culture survival assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout with defined cellular phenotype, in vivo and in vitro validation, demonstrates tissue-specific requirement","pmids":["11713295"],"is_preprint":false},{"year":2011,"finding":"AMSH-deficient mice accumulate ubiquitinated protein aggregates in the brain beginning at embryonic day 10. TDP-43, glutamate receptors, and p62 co-accumulate with ubiquitinated aggregates in the brain, indicating AMSH is required for degradation of ubiquitinated proteins and glutamate receptors in the CNS in vivo.","method":"AMSH knockout mouse, immunohistochemistry, immunofluorescence co-localization","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo loss-of-function with defined substrate accumulation phenotype, single lab","pmids":["21531206"],"is_preprint":false},{"year":2013,"finding":"Loss-of-function mutations in STAMBP cause microcephaly-capillary malformation (MIC-CAP) syndrome. Patient cell lines show reduced STAMBP expression associated with accumulation of ubiquitin-conjugated protein aggregates, elevated apoptosis, and insensitive (constitutive) activation of RAS-MAPK and PI3K-AKT-mTOR signaling pathways.","method":"Whole-exome sequencing, patient cell line analysis, western blotting for pathway activation, apoptosis assays","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple patient cell lines, multiple orthogonal readouts; independently replicated in subsequent clinical genetics papers","pmids":["23542699"],"is_preprint":false},{"year":2014,"finding":"AMSH interacts with Cx43 (connexin-43), mediates its deubiquitination, and is recruited to gap junction plaque sites at the plasma membrane. Cx43 is modified with K63-linked polyubiquitin chains. siRNA depletion or catalytically inactive AMSH overexpression increases both the internalization and degradation rate of Cx43, indicating that AMSH-mediated deubiquitination protects gap junctions from degradation.","method":"Co-IP, siRNA knockdown, catalytic mutant overexpression, fluorescence microscopy, ubiquitin linkage-specific analysis","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus functional trafficking assay with siRNA and dominant-negative, single lab","pmids":["25070368"],"is_preprint":false},{"year":2006,"finding":"AMSH interacts with the carboxyl terminus of the calcium-sensing receptor (CaR) and causes a decrease in CaR signaling properties. AMSH overexpression redirects CaR from slow recycling (Rab11a-dependent) to down-regulation, reducing CaR expression and PTHrP secretion.","method":"Yeast two-hybrid/co-IP, dominant-negative Rab11a, PTHrP secretion assay, CaR signaling assays","journal":"Biochemical and biophysical research communications; Molecular endocrinology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP binding plus functional signaling readout, replicated across two independent papers from same group","pmids":["16854379","17426287"],"is_preprint":false},{"year":2006,"finding":"STAM binding to AMSH via the SH3 domain (requiring a PxVDRxxKP motif in AMSH) facilitates the deubiquitination activity of the isolated AMSH C-terminal domain in vitro, with specificity toward K63-linked ubiquitin chains, by enabling simultaneous STAM-ubiquitin and AMSH-ubiquitin engagement.","method":"In vitro DUB assay with purified components, binding affinity measurement, mutagenesis","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro reconstitution but single lab, single study","pmids":["17078930"],"is_preprint":false},{"year":2015,"finding":"The VHS (Vps27/Hrs/STAM) domain of STAM directs AMSH to preferentially cleave longer K63-linked ubiquitin chains by lowering Km without changing kcat for tri-ubiquitin vs. di-ubiquitin. STAM also directs AMSH cleavage toward the distal isopeptide bond in tri-ubiquitin chains. This effect requires homogenous K63-linkages.","method":"In vitro cleavage kinetics, STAM domain truncation mutants, structural modeling","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro kinetic analysis with domain mutants, single lab with multiple chain lengths tested","pmids":["26601948"],"is_preprint":false},{"year":2016,"finding":"NMR analysis shows that the SH3-binding motif (SBM) of AMSH outcompetes K63-linked diubiquitin for binding to the SH3 domain of STAM2. The NMR solution structure of the AMSH-SBM/STAM2-SH3 complex was determined, revealing how AMSH binding to STAM2 positions AMSH for polyubiquitin chain cleavage.","method":"NMR spectroscopy, solution structure determination, binding competition experiments","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structure with binding competition validation, single lab with rigorous biophysical methods","pmids":["27725184"],"is_preprint":false},{"year":2017,"finding":"STAMBP deubiquitinates NALP7, impeding its trafficking to lysosomes and thereby stabilizing NALP7 protein upon TLR ligation by LPS or Pam3CSK4. STAMBP knockdown abrogates TLR agonist-induced NALP7 accumulation. A small-molecule STAMBP inhibitor (BC-1471) decreases NALP7 levels and suppresses IL-1β release.","method":"siRNA knockdown, Co-IP, ubiquitination assay, small-molecule inhibitor treatment, IL-1β ELISA","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and deubiquitination assay with multiple functional readouts, single lab","pmids":["28492230"],"is_preprint":false},{"year":2020,"finding":"STAMBP deubiquitinates NLRP3 by removing K63-linked polyubiquitin chains, acting as a negative regulator of NLRP3 inflammasome activation. CRISPR/Cas9 knockout of STAMBP in monocytes increases NLRP3 K63-polyubiquitination, inflammasome activation, and IL-1β release after TLR ligation, without altering NLRP3 protein abundance.","method":"CRISPR/Cas9 knockout, ubiquitination assay, ELISA for cytokines, inflammasome activation assay","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR KO with defined molecular readout (K63 ubiquitination) and functional inflammasome assay, single lab","pmids":["33253913"],"is_preprint":false},{"year":2021,"finding":"Ubiquitin variant (UbV) inhibitors UbVSP.1 and UbVSP.3 were developed that bind STAMBP with high affinity and potently inhibit its isopeptidase activity. The crystal structure of the STAMBPL1-UbVSP.1 complex was determined by X-ray crystallography, revealing hotspots of the JAMM-UbV interaction relevant to STAMBP.","method":"Phage display, X-ray crystallography, in vitro isopeptidase inhibition assays, affinity measurements","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with in vitro enzymatic validation of inhibition, phage display selection; single lab with multiple orthogonal methods","pmids":["34425109"],"is_preprint":false},{"year":2022,"finding":"STAMBP stabilizes the actin-binding protein RAI14 by deubiquitinating K48-linked polyubiquitin chains on RAI14, thereby preventing its proteasomal degradation. Knockdown of STAMBP reduces RAI14 protein levels and suppresses TNBC tumor growth in vitro and in vivo.","method":"IP-mass spectrometry, Co-IP, ubiquitination assay, siRNA knockdown, xenograft mouse model","journal":"Experimental & molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — IP-MS identification followed by Co-IP and ubiquitination assay, in vivo validation, single lab","pmids":["36434041"],"is_preprint":false},{"year":2025,"finding":"The MIT domain of STAMBP autoinhibits its catalytic domain by binding tightly to it and occupying a large portion of the distal ubiquitin-binding site. The crystal structure of the MIT-CD complex reveals this mechanism. STAM1 binding to STAMBP relieves this autoinhibition and enhances activity, whereas CHMP3 binding does not relieve autoinhibition.","method":"X-ray crystallography, biochemical activity assays with domain fragments, mutational analysis, binding assays","journal":"Structure (London, England : 1993)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with functional biochemical validation of autoinhibition and relief mechanisms, single lab with orthogonal methods","pmids":["40441142"],"is_preprint":false},{"year":2021,"finding":"STAMBP deubiquitinates EGFR to promote its membrane stabilization and prevents its degradation in lung adenocarcinoma cells. STAMBP localizes to early endosomes where it acts on EGFR, and its knockdown reduces EGFR stability and attenuates MAPK/ERK signaling after EGF treatment.","method":"siRNA knockdown, immunofluorescence, EGFR stability and ubiquitination assay, western blotting for ERK, xenograft mouse model","journal":"Neoplasia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization plus functional receptor stability assay with in vivo validation, single lab","pmids":["34102455"],"is_preprint":false},{"year":2025,"finding":"STAMBP deubiquitinates ERα by removing K48-linked polyubiquitin chains, thereby enhancing ERα protein stability and promoting ERα-dependent oncogenic signaling. STAMBP knockdown reduces ERα stability and restores tamoxifen sensitivity in endocrine-resistant breast cancer cells.","method":"siRNA knockdown, Co-IP, ubiquitination assay, drug sensitivity assay","journal":"Biomolecules","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP/ubiquitination assay, single lab, no mutagenesis or structural validation","pmids":["41301420"],"is_preprint":false},{"year":2025,"finding":"STAMBP is phosphorylated by IKKα at Ser2, and this phosphorylation activates STAMBP to deubiquitinate BAG3 by removing K63-linked polyubiquitin chains at Lys29 and Lys60, stabilizing BAG3 and promoting PDAC progression. STAMBP deficiency increases cisplatin/oxaliplatin sensitivity.","method":"Mass spectrometry substrate identification, Co-IP, ubiquitination assay with site-specific mutants, phosphorylation assay, xenograft mouse model","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS identification of substrate and modification sites, functional ubiquitination assay with mutagenesis, in vivo validation; single lab","pmids":["41611844"],"is_preprint":false},{"year":2025,"finding":"STAMBP deubiquitinates CXCR4 to stabilize its protein expression in colorectal cancer cells, promoting CRC proliferation and MDSC recruitment. Silencing CXCR4 reversed both STAMBP-driven tumor growth and MDSC infiltration.","method":"siRNA knockdown, Co-IP, ubiquitination assay, functional proliferation and immune cell recruitment assays","journal":"Genes and immunity","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP/ubiquitination assay, single lab, limited mechanistic detail in abstract","pmids":["41559433"],"is_preprint":false},{"year":2025,"finding":"NOL6 recruits STAMBP to deubiquitinate YY1 by removing K48-linked polyubiquitin chains at lysine 339, preventing YY1 proteasomal degradation and enhancing c-Myc transcription in colorectal cancer.","method":"Co-IP, ubiquitination assay with site-specific mutants, reporter assay for c-Myc transcription","journal":"Cell reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Co-IP and ubiquitination with mutagenesis, but mechanistic chain depends on multiple proteins; single lab","pmids":["41456274"],"is_preprint":false},{"year":2024,"finding":"CNS-specific Stambp knockout mice phenocopy null mice with microcephaly, growth retardation, and preweaning death. Early-onset neuronal death occurs specifically in hippocampus and cortex with ubiquitinated protein aggregation and neuroinflammation. AAV9-mediated postnatal Stambp gene supplementation to the brain rescues neurological defects, sustains growth, and prolongs lifespan.","method":"Conditional knockout mouse, histopathology, AAV9 gene therapy rescue experiment","journal":"Molecular therapy","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean conditional KO with defined phenotype plus gene replacement rescue demonstrating brain-specific requirement; multiple readouts","pmids":["39169623"],"is_preprint":false},{"year":2024,"finding":"STAMBP knockout in human cortical organoids reduces neural stem cell (NSC) proliferation, yielding smaller organoids characteristic of microcephaly. Re-expression of wild-type STAMBP rescues impaired NSC proliferation, but known pathogenic mutants do not, directly linking STAMBP catalytic function to cortical neurogenesis.","method":"hESC-derived cortical organoids with STAMBP KO, rescue by wild-type vs. mutant re-expression, proliferation assays","journal":"Frontiers in neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — human organoid KO with mutant rescue experiment, single lab","pmids":["36033615"],"is_preprint":false},{"year":2024,"finding":"STAMBP-deficient neural progenitor cells (NPCs) derived from hESCs fail to maintain long-term in vitro expansion. The anti-apoptotic protein CFLAR is downregulated in STAMBP-deficient NPCs, and ectopic CFLAR expression rescues NPC defects, placing STAMBP upstream of the death receptor apoptosis pathway in NPCs.","method":"hESC differentiation, STAMBP KO, protein expression analysis, CFLAR rescue experiment","journal":"Stem cell reviews and reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO with defined downstream effector identified and rescue confirmed, single lab","pmids":["38951308"],"is_preprint":false}],"current_model":"STAMBP (AMSH) is a JAMM-domain Zn-metalloprotease deubiquitinase with strict specificity for K63-linked polyubiquitin chains; its MIT domain autoinhibits the catalytic domain by occluding the distal ubiquitin-binding site, and this inhibition is relieved by STAM binding, which simultaneously positions AMSH on ubiquitinated endosomal cargo through a two-ubiquitin-engagement mechanism; clathrin anchors AMSH to early endosomes, and ESCRT-III CHMP3 interaction (via a high-affinity MIM4-MIT interface) is required for in vivo cargo deubiquitination; AMSH is ubiquitinated and degraded via an RNF11/Smurf2 axis; it regulates lysosomal fate of multiple surface receptors (EGFR, CXCR4, CaR, Cx43, NALP7, ERα, RAI14, BAG3, YY1) and restrains NLRP3 inflammasome activation; IKKα-mediated phosphorylation at Ser2 activates its substrate-specific activity; and loss of STAMBP causes microcephaly-capillary malformation syndrome through ubiquitinated protein aggregate accumulation, elevated apoptosis, and constitutive RAS-MAPK/PI3K-AKT-mTOR pathway activation in the CNS."},"narrative":{"mechanistic_narrative":"STAMBP (AMSH) is a JAMM-domain zinc metalloprotease deubiquitinase that functions in endosomal cargo sorting by cleaving polyubiquitin from membrane receptors, with strict preference for K63-linked chains in its activated state [PMID:15314065, PMID:16431367, PMID:24151880]. Catalysis depends on a conserved active site, and an inactivating D348A mutation causes ubiquitin to accumulate on endosomes and stabilizes ubiquitinated STAM [PMID:15314065]. Its activity is gated by intramolecular autoinhibition: the N-terminal MIT domain binds the catalytic domain and occludes the distal ubiquitin-binding site, an inhibition relieved specifically by STAM binding but not by CHMP3 [PMID:40441142]. STAM stimulation underlies the enzyme's K63 specificity by supplying a ubiquitin-interaction module that engages the proximal ubiquitin while the catalytic domain binds the distal ubiquitin, stabilizing the chain in a productive orientation and biasing cleavage toward distal isopeptide bonds in longer chains [PMID:24151880, PMID:17078930, PMID:26601948, PMID:27725184]. STAMBP is embedded in the multivesicular-body machinery: a clathrin-binding site on its N-terminus anchors it to early endosomes independently of STAM [PMID:16716190], while interaction with ESCRT-III subunits including CHMP3 (via a high-affinity MIM4–MIT interface) is required for in vivo deubiquitination of cargo rather than for localization or catalysis per se [PMID:16431367, PMID:16760479, PMID:17261583, PMID:17159328, PMID:21827950]. Through these activities STAMBP controls the lysosomal fate of multiple surface receptors and substrates, including EGFR, CXCR4, connexin-43, and the calcium-sensing receptor, and restrains NLRP3 inflammasome activation by removing K63 chains from NLRP3 [PMID:15314065, PMID:20159979, PMID:25070368, PMID:16854379, PMID:17426287, PMID:33253913, PMID:34102455]. STAMBP protein level is itself controlled by an RNF11/Smurf2 axis that ubiquitinates it for proteasomal degradation [PMID:14755250]. Loss-of-function mutations in STAMBP cause microcephaly-capillary malformation (MIC-CAP) syndrome, with patient cells showing ubiquitin-conjugated protein aggregates, elevated apoptosis, and constitutive RAS-MAPK and PI3K-AKT-mTOR signaling [PMID:23542699]; this neuronal requirement is reinforced by knockout mice that develop hippocampal and cortical neuronal death with ubiquitinated aggregate accumulation, a phenotype rescuable by brain-directed STAMBP gene supplementation [PMID:11713295, PMID:21531206, PMID:39169623].","teleology":[{"year":1999,"claim":"Established STAMBP/AMSH as a STAM-associated molecule functionally linked to cytokine signaling, framing it as more than an isolated protein.","evidence":"Yeast two-hybrid against the STAM SH3 domain plus dominant-negative proliferation/signaling assays","pmids":["10383417"],"confidence":"Medium","gaps":["No enzymatic activity defined","Mechanism downstream of STAM unresolved"]},{"year":2001,"claim":"Defined a tissue-specific essential role by showing AMSH loss selectively kills hippocampal CA1 and cortical neurons, distinguishing neuronal dependence from a general housekeeping function.","evidence":"Gene-targeted knockout mouse with histopathology and in vitro neuronal survival assays","pmids":["11713295"],"confidence":"High","gaps":["Molecular basis of neuron-selective death not established","No link to enzymatic activity yet"]},{"year":2004,"claim":"Identified STAMBP as a ubiquitin isopeptidase acting on endosomal cargo, and revealed it is itself degraded via an RNF11/Smurf2 ubiquitination axis, establishing both its catalytic identity and its turnover.","evidence":"In vitro isopeptidase assay with active-site mutagenesis (D348A), siRNA, plus Co-IP and in vitro ubiquitination assays for RNF11/Smurf2","pmids":["15314065","14755250"],"confidence":"High","gaps":["Chain-linkage specificity in cells not yet resolved","Regulation of the RNF11/Smurf2 axis unknown"]},{"year":2006,"claim":"Determined how STAMBP is recruited and activated: clathrin anchors it to early endosomes, ESCRT-III subunits provide cargo-proximal positioning, and STAM binding markedly stimulates K63-chain cleavage.","evidence":"RNAi, deletion mutants, fluorescence colocalization, in vitro reconstitution with purified STAM, and reciprocal Co-IP with CHMP1A/1B/2A/3","pmids":["16431367","16760479","16716190","17078930","16854379","17426287"],"confidence":"Medium","gaps":["Separation of localization vs. catalytic requirements still incomplete","Structural basis of activation not yet known"]},{"year":2007,"claim":"Demonstrated that endosomal localization via CHMP3 is functionally required, separating receptor degradation from internalization.","evidence":"Dominant-negative CHMP3 mislocalization with EGFR degradation assays and Co-IP","pmids":["17261583","17159328"],"confidence":"Medium","gaps":["Whether CHMP3 contributes catalytically or only positionally needed clarification"]},{"year":2011,"claim":"Provided the structural and disease framework: crystal structures of the catalytic domain and the MIT–CHMP3 interface explained the high-affinity ESCRT engagement, while knockout mice showed ubiquitinated aggregate accumulation with co-trapped TDP-43, glutamate receptors, and p62.","evidence":"X-ray crystallography, ITC/SPR, thermodynamic unfolding, HIV-1 budding assay, and knockout-mouse immunohistochemistry","pmids":["21888914","21827950","21531206"],"confidence":"High","gaps":["Autoinhibitory role of the MIT domain not yet recognized","In vivo substrate hierarchy in neurons unresolved"]},{"year":2013,"claim":"Connected enzyme mechanism to human disease, showing proximal-ubiquitin recognition drives K63 specificity and that the MIC-CAP mutation T313I abolishes catalysis, while patient cells reveal aggregate accumulation, apoptosis, and constitutive RAS-MAPK/PI3K-AKT-mTOR signaling.","evidence":"Kinetic and mutational analyses with purified STAM, plus whole-exome sequencing and patient cell-line pathway/apoptosis assays","pmids":["24151880","23542699"],"confidence":"High","gaps":["How catalytic loss drives pathway hyperactivation mechanistically unclear","Capillary malformation phenotype mechanism unaddressed"]},{"year":2015,"claim":"Refined the activation model by showing the STAM VHS domain tunes chain-length preference and directs distal-bond cleavage, lowering Km for longer K63 chains.","evidence":"In vitro cleavage kinetics with STAM domain truncations and chain-length panels","pmids":["26601948","25070368"],"confidence":"Medium","gaps":["Physiological chain lengths on real cargo not measured"]},{"year":2017,"claim":"Extended STAMBP function to innate immunity by showing it stabilizes NALP7 and controls IL-1β release, and that a small-molecule inhibitor reproduces loss of function.","evidence":"siRNA, Co-IP, ubiquitination assays, BC-1471 inhibitor treatment, and IL-1β ELISA","pmids":["28492230"],"confidence":"Medium","gaps":["Linkage specificity on NALP7 not defined","Inhibitor selectivity not fully characterized"]},{"year":2020,"claim":"Defined STAMBP as a negative regulator of the NLRP3 inflammasome acting by removing K63 chains from NLRP3 without changing its abundance.","evidence":"CRISPR/Cas9 knockout in monocytes, ubiquitination assays, and inflammasome/cytokine readouts","pmids":["33253913"],"confidence":"Medium","gaps":["Recruitment to NLRP3 not mapped","In vivo inflammatory role untested"]},{"year":2021,"claim":"Established pharmacological tractability and EGFR regulation, developing ubiquitin-variant inhibitors with a JAMM–UbV crystal structure and showing STAMBP stabilizes EGFR to sustain MAPK/ERK signaling.","evidence":"Phage display, X-ray crystallography of STAMBPL1-UbV, in vitro inhibition assays, plus siRNA and EGFR stability/xenograft assays","pmids":["34425109","34102455"],"confidence":"High","gaps":["Cellular efficacy of UbV inhibitors not shown","EGFR linkage type in this context not detailed"]},{"year":2022,"claim":"Broadened substrate scope beyond K63 by showing STAMBP removes K48 chains from RAI14 to block proteasomal degradation, supporting tumor growth.","evidence":"IP-mass spectrometry, Co-IP, ubiquitination assays, siRNA, and xenograft model","pmids":["36434041"],"confidence":"Medium","gaps":["Reconciliation of K48 activity with reported K63 specificity unaddressed"]},{"year":2024,"claim":"Cemented the brain-specific requirement and therapeutic potential, with CNS-specific knockout phenocopying microcephaly and AAV9 gene supplementation rescuing defects, while human models linked catalytic function to neurogenesis via NSC proliferation and CFLAR-dependent survival.","evidence":"Conditional knockout mice with AAV9 rescue, hESC cortical organoid KO with wild-type vs. mutant rescue, and NPC expansion/CFLAR rescue assays","pmids":["39169623","36033615","38951308"],"confidence":"High","gaps":["Direct neuronal substrates driving death not pinpointed","How catalytic loss lowers CFLAR mechanistically unknown"]},{"year":2025,"claim":"Resolved the activation switch and expanded oncogenic substrate networks, showing the MIT domain autoinhibits the catalytic domain (relieved by STAM but not CHMP3) and that IKKα phosphorylation at Ser2 activates substrate-specific deubiquitination of BAG3, with additional cancer substrates ERα, CXCR4, and YY1.","evidence":"X-ray crystallography of the MIT-CD complex with biochemical validation, mass spectrometry, Co-IP, site-specific ubiquitination assays, and xenograft models","pmids":["40441142","41611844","41301420","41559433","41456274"],"confidence":"High","gaps":["Mix of K48 and K63 substrate claims not mechanistically unified","Several cancer-substrate findings rest on single-lab Co-IP without structural validation"]},{"year":null,"claim":"It remains unresolved how STAMBP's endosomal/ESCRT-coupled K63 deubiquitination relates mechanistically to its reported K48-cleaving, proteasome-sparing roles on cytosolic and nuclear substrates, and how catalytic loss produces the specific neuronal death and pathway hyperactivation of MIC-CAP.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking linkage specificity to substrate localization","Direct disease-relevant neuronal substrates uncharacterized","Mechanism of constitutive RAS-MAPK/PI3K-AKT-mTOR activation unexplained"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,11,15,20,21,23,25,27]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[0,11,22]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[5,1]}],"localization":[{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[0,4,5,25]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[15]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1,7]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,1,4,25]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,7,11,23]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[20,21]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[14,30]}],"complexes":["ESCRT-III"],"partners":["STAM","CHMP3","CHMP1A","CHMP1B","CHMP2A","CLTC","RNF11","SMURF2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O95630","full_name":"STAM-binding protein","aliases":["Associated molecule with the SH3 domain of STAM","Endosome-associated ubiquitin isopeptidase"],"length_aa":424,"mass_kda":48.1,"function":"Zinc metalloprotease that specifically cleaves 'Lys-63'-linked polyubiquitin chains (PubMed:15314065, PubMed:23542699, PubMed:34425109). Does not cleave 'Lys-48'-linked polyubiquitin chains (PubMed:15314065). Plays a role in signal transduction for cell growth and MYC induction mediated by IL-2 and GM-CSF (PubMed:10383417). Potentiates BMP (bone morphogenetic protein) signaling by antagonizing the inhibitory action of SMAD6 and SMAD7 (PubMed:11483516). Has a key role in regulation of cell surface receptor-mediated endocytosis and ubiquitin-dependent sorting of receptors to lysosomes (PubMed:15314065, PubMed:17261583). Endosomal localization of STAMBP is required for efficient EGFR degradation but not for its internalization (PubMed:15314065, PubMed:17261583). Involved in the negative regulation of PI3K-AKT-mTOR and RAS-MAP signaling pathways (PubMed:23542699)","subcellular_location":"Nucleus; Membrane; Cytoplasm; Early endosome","url":"https://www.uniprot.org/uniprotkb/O95630/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/STAMBP","classification":"Not Classified","n_dependent_lines":372,"n_total_lines":1208,"dependency_fraction":0.3079470198675497},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/STAMBP","total_profiled":1310},"omim":[{"mim_id":"614261","title":"MICROCEPHALY-CAPILLARY MALFORMATION SYNDROME; MICCAP","url":"https://www.omim.org/entry/614261"},{"mim_id":"612598","title":"RING FINGER PROTEIN 11; RNF11","url":"https://www.omim.org/entry/612598"},{"mim_id":"612352","title":"STAM-BINDING PROTEIN-LIKE 1; STAMBPL1","url":"https://www.omim.org/entry/612352"},{"mim_id":"606247","title":"STAM-BINDING PROTEIN; STAMBP","url":"https://www.omim.org/entry/606247"},{"mim_id":"605532","title":"SMAD-SPECIFIC E3 UBIQUITIN PROTEIN LIGASE 2; SMURF2","url":"https://www.omim.org/entry/605532"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Plasma membrane","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/STAMBP"},"hgnc":{"alias_symbol":["AMSH"],"prev_symbol":[]},"alphafold":{"accession":"O95630","domains":[{"cath_id":"1.20.58.80","chopping":"1-181","consensus_level":"medium","plddt":90.5603,"start":1,"end":181},{"cath_id":"3.40.140.10","chopping":"256-421","consensus_level":"high","plddt":93.0034,"start":256,"end":421}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O95630","model_url":"https://alphafold.ebi.ac.uk/files/AF-O95630-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O95630-F1-predicted_aligned_error_v6.png","plddt_mean":84.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=STAMBP","jax_strain_url":"https://www.jax.org/strain/search?query=STAMBP"},"sequence":{"accession":"O95630","fasta_url":"https://rest.uniprot.org/uniprotkb/O95630.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O95630/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O95630"}},"corpus_meta":[{"pmid":"15314065","id":"PMC_15314065","title":"AMSH 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An inactivating mutation (D348A) causes accumulation of ubiquitin on endosomes and stabilization of ubiquitinated STAM. AMSH knockdown enhances EGFR degradation rate, and ubiquitinated EGFR serves as an in vitro substrate.\",\n      \"method\": \"In vitro isopeptidase assay, active-site mutagenesis (D348A), siRNA knockdown, immunofluorescence\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro enzymatic assay with active-site mutagenesis, multiple orthogonal methods, foundational study replicated across many subsequent papers\",\n      \"pmids\": [\"15314065\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"AMSH is activated by coincubation with STAM, showing marked stimulation of K63-linked polyubiquitin chain cleavage in vitro. AMSH directly binds clathrin and ESCRT-III component mVps24/CHMP3; simultaneous STAM binding reinforces the CHMP3 interaction. These interactions embed AMSH within the MVB-sorting machinery.\",\n      \"method\": \"In vitro enzymatic assay with purified components, direct binding assays, Co-IP\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of activation with purified proteins, multiple binding partners confirmed, single lab with orthogonal methods\",\n      \"pmids\": [\"16431367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"AMSH (STAMBP) was identified as a novel molecule interacting with the SH3 domain of STAM. A dominant-negative C-terminal deletion mutant of AMSH inhibits IL-2- and GM-CSF-mediated signaling for DNA synthesis and c-myc induction, placing AMSH downstream of the Jak2/Jak3·STAM complex.\",\n      \"method\": \"Yeast two-hybrid, dominant-negative mutant overexpression, cell proliferation and signaling assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid binding plus dominant-negative functional readout, single lab\",\n      \"pmids\": [\"10383417\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"AMSH interacts with ESCRT-III subunits CHMP1A, CHMP1B, CHMP2A, and CHMP3. Catalytically inactive AMSH acts as a dominant negative, inhibiting retroviral budding and causing accumulation of ubiquitinated endosomal cargo. VPS4 and AMSH compete for binding to C-terminal regions of CHMP1A and CHMP1B.\",\n      \"method\": \"Co-IP, dominant-negative overexpression, retroviral budding assay, competition binding assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal interaction mapping, functional dominant-negative readout, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"16760479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"AMSH interacts with CHMP3 (ESCRT-III) in cells; a dominant-negative CHMP3 that prevents AMSH targeting to endosomes inhibits EGFR degradation but not internalization, demonstrating that endosomal localization of AMSH is required for its function in the MVB pathway.\",\n      \"method\": \"Co-IP, dominant-negative CHMP3 overexpression, EGFR degradation assay, fluorescence microscopy\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional consequence of mislocalization established by dominant-negative, Co-IP, single lab\",\n      \"pmids\": [\"17261583\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"AMSH and AMSH-LP are anchored to early endosomes via a novel clathrin-binding site on the terminal domain of clathrin heavy chain. Deletion of this site or RNAi depletion of clathrin heavy chain abolishes endosomal localization of AMSH, whereas loss of STAM-binding does not affect endosomal localization.\",\n      \"method\": \"RNAi knockdown, deletion mutants, fluorescence co-localization microscopy, fractionation\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiment with functional consequence, multiple complementary approaches, single lab\",\n      \"pmids\": [\"16716190\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"AMSH-mediated deubiquitination of endosomal cargo in vivo requires both its catalytic DUB activity and its CHMP3-binding ability; an AMSH mutant lacking CHMP3-binding localizes normally to endosomes but causes accumulation of ubiquitinated cargo, indicating CHMP3 interaction is needed for in vivo substrate access rather than localization or catalytic activity per se.\",\n      \"method\": \"Mutant overexpression, immunofluorescence, in vitro DUB assay\",\n      \"journal\": \"Cell structure and function\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dissection of binding vs. catalytic requirements by mutational analysis, single lab\",\n      \"pmids\": [\"17159328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"RNF11 binds AMSH in mammalian cells independently of the RNF11 RING domain and PY motif, and recruits AMSH to the HECT-type E3 ligase Smurf2, which ubiquitinates AMSH leading to its proteasomal degradation.\",\n      \"method\": \"Yeast two-hybrid, Co-IP in mammalian cells, in vitro ubiquitination assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP binding plus functional ubiquitination assay establishing writer (Smurf2) and adaptor (RNF11), single lab\",\n      \"pmids\": [\"14755250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"AMSH loss-of-function or catalytic inactivity increases basal steady-state CXCR4 levels, and catalytically inactive AMSH causes basal hyperubiquitination of ESCRT-0 components STAM1 and Hrs in an RXXK-motif-dependent manner. The RXXK motif mediates high-affinity interaction with SH3 domains of STAM and Grb2 families.\",\n      \"method\": \"RNAi knockdown, catalytic mutant overexpression, co-IP, CXCR4 trafficking/degradation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (RNAi, catalytic mutant, Co-IP), single lab\",\n      \"pmids\": [\"20159979\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Crystal structure of the AMSH catalytic domain (JAMM motif) was determined; the catalytic domain of AMSH is nearly identical to that of AMSH-LP but is thermodynamically less stable. An active-site mutant (E280A) retains zinc coordination via compensatory aspartate repositioning, indicating structural plasticity. A modeled AMSH-diubiquitin complex reveals a distinct distal ubiquitin interface compared to AMSH-LP.\",\n      \"method\": \"X-ray crystallography, guanidine-HCl unfolding (thermodynamic stability), structural modeling\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with active-site mutagenesis and thermodynamic characterization, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"21888914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Crystal structure of the AMSH N-terminal fragment in complex with CHMP3 C-terminal region reveals that the AMSH N-terminus folds into an elongated helical assembly containing an unusual MIT domain. CHMP3 is unstructured in solution but forms a helix upon binding AMSH via a novel MIM4 motif with unusually high affinity. The N-terminal helical segment of AMSH has a regulatory role: its destabilization causes loss of function during HIV-1 budding.\",\n      \"method\": \"X-ray crystallography, ITC, SPR, HIV-1 budding functional assay\",\n      \"journal\": \"Structure (London, England : 1993)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure validated by ITC, SPR, and functional assay; multiple orthogonal methods in one study\",\n      \"pmids\": [\"21827950\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Kinetic and mutational analysis established that proximal ubiquitin recognition is critical for AMSH's K63-linkage specificity and catalytic efficiency. The MIC-CAP disease mutation T313I causes substantial loss of catalytic activity without altering thermodynamic stability. STAM activates AMSH by providing its UIM to bind the proximal ubiquitin while AMSH catalytic domain binds the distal ubiquitin, stabilizing the chain in a productive orientation.\",\n      \"method\": \"Kinetic assays, site-directed mutagenesis, biochemical/biophysical analyses (thermal stability), in vitro reconstitution with purified STAM\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinetic reconstitution with mutagenesis and stability measurements; mechanistic model supported by multiple orthogonal biochemical methods, single lab\",\n      \"pmids\": [\"24151880\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"AMSH-deficient mice generated by gene targeting show selective postnatal death of hippocampal CA1 neurons and cerebral cortex atrophy, with AMSH-deficient hippocampal neurons unable to survive in vitro. Neurons from other regions (cerebellum) and other cell types (thymocytes, fibroblasts) survive normally, establishing a tissue-specific essential role for AMSH in neuronal survival.\",\n      \"method\": \"Gene-targeted knockout mouse, histopathology, in vitro neuronal culture survival assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout with defined cellular phenotype, in vivo and in vitro validation, demonstrates tissue-specific requirement\",\n      \"pmids\": [\"11713295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"AMSH-deficient mice accumulate ubiquitinated protein aggregates in the brain beginning at embryonic day 10. TDP-43, glutamate receptors, and p62 co-accumulate with ubiquitinated aggregates in the brain, indicating AMSH is required for degradation of ubiquitinated proteins and glutamate receptors in the CNS in vivo.\",\n      \"method\": \"AMSH knockout mouse, immunohistochemistry, immunofluorescence co-localization\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo loss-of-function with defined substrate accumulation phenotype, single lab\",\n      \"pmids\": [\"21531206\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Loss-of-function mutations in STAMBP cause microcephaly-capillary malformation (MIC-CAP) syndrome. Patient cell lines show reduced STAMBP expression associated with accumulation of ubiquitin-conjugated protein aggregates, elevated apoptosis, and insensitive (constitutive) activation of RAS-MAPK and PI3K-AKT-mTOR signaling pathways.\",\n      \"method\": \"Whole-exome sequencing, patient cell line analysis, western blotting for pathway activation, apoptosis assays\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple patient cell lines, multiple orthogonal readouts; independently replicated in subsequent clinical genetics papers\",\n      \"pmids\": [\"23542699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"AMSH interacts with Cx43 (connexin-43), mediates its deubiquitination, and is recruited to gap junction plaque sites at the plasma membrane. Cx43 is modified with K63-linked polyubiquitin chains. siRNA depletion or catalytically inactive AMSH overexpression increases both the internalization and degradation rate of Cx43, indicating that AMSH-mediated deubiquitination protects gap junctions from degradation.\",\n      \"method\": \"Co-IP, siRNA knockdown, catalytic mutant overexpression, fluorescence microscopy, ubiquitin linkage-specific analysis\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus functional trafficking assay with siRNA and dominant-negative, single lab\",\n      \"pmids\": [\"25070368\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"AMSH interacts with the carboxyl terminus of the calcium-sensing receptor (CaR) and causes a decrease in CaR signaling properties. AMSH overexpression redirects CaR from slow recycling (Rab11a-dependent) to down-regulation, reducing CaR expression and PTHrP secretion.\",\n      \"method\": \"Yeast two-hybrid/co-IP, dominant-negative Rab11a, PTHrP secretion assay, CaR signaling assays\",\n      \"journal\": \"Biochemical and biophysical research communications; Molecular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP binding plus functional signaling readout, replicated across two independent papers from same group\",\n      \"pmids\": [\"16854379\", \"17426287\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"STAM binding to AMSH via the SH3 domain (requiring a PxVDRxxKP motif in AMSH) facilitates the deubiquitination activity of the isolated AMSH C-terminal domain in vitro, with specificity toward K63-linked ubiquitin chains, by enabling simultaneous STAM-ubiquitin and AMSH-ubiquitin engagement.\",\n      \"method\": \"In vitro DUB assay with purified components, binding affinity measurement, mutagenesis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro reconstitution but single lab, single study\",\n      \"pmids\": [\"17078930\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The VHS (Vps27/Hrs/STAM) domain of STAM directs AMSH to preferentially cleave longer K63-linked ubiquitin chains by lowering Km without changing kcat for tri-ubiquitin vs. di-ubiquitin. STAM also directs AMSH cleavage toward the distal isopeptide bond in tri-ubiquitin chains. This effect requires homogenous K63-linkages.\",\n      \"method\": \"In vitro cleavage kinetics, STAM domain truncation mutants, structural modeling\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinetic analysis with domain mutants, single lab with multiple chain lengths tested\",\n      \"pmids\": [\"26601948\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NMR analysis shows that the SH3-binding motif (SBM) of AMSH outcompetes K63-linked diubiquitin for binding to the SH3 domain of STAM2. The NMR solution structure of the AMSH-SBM/STAM2-SH3 complex was determined, revealing how AMSH binding to STAM2 positions AMSH for polyubiquitin chain cleavage.\",\n      \"method\": \"NMR spectroscopy, solution structure determination, binding competition experiments\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structure with binding competition validation, single lab with rigorous biophysical methods\",\n      \"pmids\": [\"27725184\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"STAMBP deubiquitinates NALP7, impeding its trafficking to lysosomes and thereby stabilizing NALP7 protein upon TLR ligation by LPS or Pam3CSK4. STAMBP knockdown abrogates TLR agonist-induced NALP7 accumulation. A small-molecule STAMBP inhibitor (BC-1471) decreases NALP7 levels and suppresses IL-1β release.\",\n      \"method\": \"siRNA knockdown, Co-IP, ubiquitination assay, small-molecule inhibitor treatment, IL-1β ELISA\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and deubiquitination assay with multiple functional readouts, single lab\",\n      \"pmids\": [\"28492230\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"STAMBP deubiquitinates NLRP3 by removing K63-linked polyubiquitin chains, acting as a negative regulator of NLRP3 inflammasome activation. CRISPR/Cas9 knockout of STAMBP in monocytes increases NLRP3 K63-polyubiquitination, inflammasome activation, and IL-1β release after TLR ligation, without altering NLRP3 protein abundance.\",\n      \"method\": \"CRISPR/Cas9 knockout, ubiquitination assay, ELISA for cytokines, inflammasome activation assay\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO with defined molecular readout (K63 ubiquitination) and functional inflammasome assay, single lab\",\n      \"pmids\": [\"33253913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Ubiquitin variant (UbV) inhibitors UbVSP.1 and UbVSP.3 were developed that bind STAMBP with high affinity and potently inhibit its isopeptidase activity. The crystal structure of the STAMBPL1-UbVSP.1 complex was determined by X-ray crystallography, revealing hotspots of the JAMM-UbV interaction relevant to STAMBP.\",\n      \"method\": \"Phage display, X-ray crystallography, in vitro isopeptidase inhibition assays, affinity measurements\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with in vitro enzymatic validation of inhibition, phage display selection; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"34425109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"STAMBP stabilizes the actin-binding protein RAI14 by deubiquitinating K48-linked polyubiquitin chains on RAI14, thereby preventing its proteasomal degradation. Knockdown of STAMBP reduces RAI14 protein levels and suppresses TNBC tumor growth in vitro and in vivo.\",\n      \"method\": \"IP-mass spectrometry, Co-IP, ubiquitination assay, siRNA knockdown, xenograft mouse model\",\n      \"journal\": \"Experimental & molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — IP-MS identification followed by Co-IP and ubiquitination assay, in vivo validation, single lab\",\n      \"pmids\": [\"36434041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The MIT domain of STAMBP autoinhibits its catalytic domain by binding tightly to it and occupying a large portion of the distal ubiquitin-binding site. The crystal structure of the MIT-CD complex reveals this mechanism. STAM1 binding to STAMBP relieves this autoinhibition and enhances activity, whereas CHMP3 binding does not relieve autoinhibition.\",\n      \"method\": \"X-ray crystallography, biochemical activity assays with domain fragments, mutational analysis, binding assays\",\n      \"journal\": \"Structure (London, England : 1993)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with functional biochemical validation of autoinhibition and relief mechanisms, single lab with orthogonal methods\",\n      \"pmids\": [\"40441142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"STAMBP deubiquitinates EGFR to promote its membrane stabilization and prevents its degradation in lung adenocarcinoma cells. STAMBP localizes to early endosomes where it acts on EGFR, and its knockdown reduces EGFR stability and attenuates MAPK/ERK signaling after EGF treatment.\",\n      \"method\": \"siRNA knockdown, immunofluorescence, EGFR stability and ubiquitination assay, western blotting for ERK, xenograft mouse model\",\n      \"journal\": \"Neoplasia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization plus functional receptor stability assay with in vivo validation, single lab\",\n      \"pmids\": [\"34102455\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"STAMBP deubiquitinates ERα by removing K48-linked polyubiquitin chains, thereby enhancing ERα protein stability and promoting ERα-dependent oncogenic signaling. STAMBP knockdown reduces ERα stability and restores tamoxifen sensitivity in endocrine-resistant breast cancer cells.\",\n      \"method\": \"siRNA knockdown, Co-IP, ubiquitination assay, drug sensitivity assay\",\n      \"journal\": \"Biomolecules\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP/ubiquitination assay, single lab, no mutagenesis or structural validation\",\n      \"pmids\": [\"41301420\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"STAMBP is phosphorylated by IKKα at Ser2, and this phosphorylation activates STAMBP to deubiquitinate BAG3 by removing K63-linked polyubiquitin chains at Lys29 and Lys60, stabilizing BAG3 and promoting PDAC progression. STAMBP deficiency increases cisplatin/oxaliplatin sensitivity.\",\n      \"method\": \"Mass spectrometry substrate identification, Co-IP, ubiquitination assay with site-specific mutants, phosphorylation assay, xenograft mouse model\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS identification of substrate and modification sites, functional ubiquitination assay with mutagenesis, in vivo validation; single lab\",\n      \"pmids\": [\"41611844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"STAMBP deubiquitinates CXCR4 to stabilize its protein expression in colorectal cancer cells, promoting CRC proliferation and MDSC recruitment. Silencing CXCR4 reversed both STAMBP-driven tumor growth and MDSC infiltration.\",\n      \"method\": \"siRNA knockdown, Co-IP, ubiquitination assay, functional proliferation and immune cell recruitment assays\",\n      \"journal\": \"Genes and immunity\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP/ubiquitination assay, single lab, limited mechanistic detail in abstract\",\n      \"pmids\": [\"41559433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NOL6 recruits STAMBP to deubiquitinate YY1 by removing K48-linked polyubiquitin chains at lysine 339, preventing YY1 proteasomal degradation and enhancing c-Myc transcription in colorectal cancer.\",\n      \"method\": \"Co-IP, ubiquitination assay with site-specific mutants, reporter assay for c-Myc transcription\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Co-IP and ubiquitination with mutagenesis, but mechanistic chain depends on multiple proteins; single lab\",\n      \"pmids\": [\"41456274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CNS-specific Stambp knockout mice phenocopy null mice with microcephaly, growth retardation, and preweaning death. Early-onset neuronal death occurs specifically in hippocampus and cortex with ubiquitinated protein aggregation and neuroinflammation. AAV9-mediated postnatal Stambp gene supplementation to the brain rescues neurological defects, sustains growth, and prolongs lifespan.\",\n      \"method\": \"Conditional knockout mouse, histopathology, AAV9 gene therapy rescue experiment\",\n      \"journal\": \"Molecular therapy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean conditional KO with defined phenotype plus gene replacement rescue demonstrating brain-specific requirement; multiple readouts\",\n      \"pmids\": [\"39169623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"STAMBP knockout in human cortical organoids reduces neural stem cell (NSC) proliferation, yielding smaller organoids characteristic of microcephaly. Re-expression of wild-type STAMBP rescues impaired NSC proliferation, but known pathogenic mutants do not, directly linking STAMBP catalytic function to cortical neurogenesis.\",\n      \"method\": \"hESC-derived cortical organoids with STAMBP KO, rescue by wild-type vs. mutant re-expression, proliferation assays\",\n      \"journal\": \"Frontiers in neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — human organoid KO with mutant rescue experiment, single lab\",\n      \"pmids\": [\"36033615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"STAMBP-deficient neural progenitor cells (NPCs) derived from hESCs fail to maintain long-term in vitro expansion. The anti-apoptotic protein CFLAR is downregulated in STAMBP-deficient NPCs, and ectopic CFLAR expression rescues NPC defects, placing STAMBP upstream of the death receptor apoptosis pathway in NPCs.\",\n      \"method\": \"hESC differentiation, STAMBP KO, protein expression analysis, CFLAR rescue experiment\",\n      \"journal\": \"Stem cell reviews and reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO with defined downstream effector identified and rescue confirmed, single lab\",\n      \"pmids\": [\"38951308\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"STAMBP (AMSH) is a JAMM-domain Zn-metalloprotease deubiquitinase with strict specificity for K63-linked polyubiquitin chains; its MIT domain autoinhibits the catalytic domain by occluding the distal ubiquitin-binding site, and this inhibition is relieved by STAM binding, which simultaneously positions AMSH on ubiquitinated endosomal cargo through a two-ubiquitin-engagement mechanism; clathrin anchors AMSH to early endosomes, and ESCRT-III CHMP3 interaction (via a high-affinity MIM4-MIT interface) is required for in vivo cargo deubiquitination; AMSH is ubiquitinated and degraded via an RNF11/Smurf2 axis; it regulates lysosomal fate of multiple surface receptors (EGFR, CXCR4, CaR, Cx43, NALP7, ERα, RAI14, BAG3, YY1) and restrains NLRP3 inflammasome activation; IKKα-mediated phosphorylation at Ser2 activates its substrate-specific activity; and loss of STAMBP causes microcephaly-capillary malformation syndrome through ubiquitinated protein aggregate accumulation, elevated apoptosis, and constitutive RAS-MAPK/PI3K-AKT-mTOR pathway activation in the CNS.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"STAMBP (AMSH) is a JAMM-domain zinc metalloprotease deubiquitinase that functions in endosomal cargo sorting by cleaving polyubiquitin from membrane receptors, with strict preference for K63-linked chains in its activated state [#0, #1, #11]. Catalysis depends on a conserved active site, and an inactivating D348A mutation causes ubiquitin to accumulate on endosomes and stabilizes ubiquitinated STAM [#0]. Its activity is gated by intramolecular autoinhibition: the N-terminal MIT domain binds the catalytic domain and occludes the distal ubiquitin-binding site, an inhibition relieved specifically by STAM binding but not by CHMP3 [#24]. STAM stimulation underlies the enzyme's K63 specificity by supplying a ubiquitin-interaction module that engages the proximal ubiquitin while the catalytic domain binds the distal ubiquitin, stabilizing the chain in a productive orientation and biasing cleavage toward distal isopeptide bonds in longer chains [#11, #17, #18, #19]. STAMBP is embedded in the multivesicular-body machinery: a clathrin-binding site on its N-terminus anchors it to early endosomes independently of STAM [#5], while interaction with ESCRT-III subunits including CHMP3 (via a high-affinity MIM4–MIT interface) is required for in vivo deubiquitination of cargo rather than for localization or catalysis per se [#1, #3, #4, #6, #10]. Through these activities STAMBP controls the lysosomal fate of multiple surface receptors and substrates, including EGFR, CXCR4, connexin-43, and the calcium-sensing receptor, and restrains NLRP3 inflammasome activation by removing K63 chains from NLRP3 [#0, #8, #15, #16, #21, #25]. STAMBP protein level is itself controlled by an RNF11/Smurf2 axis that ubiquitinates it for proteasomal degradation [#7]. Loss-of-function mutations in STAMBP cause microcephaly-capillary malformation (MIC-CAP) syndrome, with patient cells showing ubiquitin-conjugated protein aggregates, elevated apoptosis, and constitutive RAS-MAPK and PI3K-AKT-mTOR signaling [#14]; this neuronal requirement is reinforced by knockout mice that develop hippocampal and cortical neuronal death with ubiquitinated aggregate accumulation, a phenotype rescuable by brain-directed STAMBP gene supplementation [#12, #13, #30].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established STAMBP/AMSH as a STAM-associated molecule functionally linked to cytokine signaling, framing it as more than an isolated protein.\",\n      \"evidence\": \"Yeast two-hybrid against the STAM SH3 domain plus dominant-negative proliferation/signaling assays\",\n      \"pmids\": [\"10383417\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No enzymatic activity defined\", \"Mechanism downstream of STAM unresolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined a tissue-specific essential role by showing AMSH loss selectively kills hippocampal CA1 and cortical neurons, distinguishing neuronal dependence from a general housekeeping function.\",\n      \"evidence\": \"Gene-targeted knockout mouse with histopathology and in vitro neuronal survival assays\",\n      \"pmids\": [\"11713295\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of neuron-selective death not established\", \"No link to enzymatic activity yet\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identified STAMBP as a ubiquitin isopeptidase acting on endosomal cargo, and revealed it is itself degraded via an RNF11/Smurf2 ubiquitination axis, establishing both its catalytic identity and its turnover.\",\n      \"evidence\": \"In vitro isopeptidase assay with active-site mutagenesis (D348A), siRNA, plus Co-IP and in vitro ubiquitination assays for RNF11/Smurf2\",\n      \"pmids\": [\"15314065\", \"14755250\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Chain-linkage specificity in cells not yet resolved\", \"Regulation of the RNF11/Smurf2 axis unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Determined how STAMBP is recruited and activated: clathrin anchors it to early endosomes, ESCRT-III subunits provide cargo-proximal positioning, and STAM binding markedly stimulates K63-chain cleavage.\",\n      \"evidence\": \"RNAi, deletion mutants, fluorescence colocalization, in vitro reconstitution with purified STAM, and reciprocal Co-IP with CHMP1A/1B/2A/3\",\n      \"pmids\": [\"16431367\", \"16760479\", \"16716190\", \"17078930\", \"16854379\", \"17426287\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Separation of localization vs. catalytic requirements still incomplete\", \"Structural basis of activation not yet known\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstrated that endosomal localization via CHMP3 is functionally required, separating receptor degradation from internalization.\",\n      \"evidence\": \"Dominant-negative CHMP3 mislocalization with EGFR degradation assays and Co-IP\",\n      \"pmids\": [\"17261583\", \"17159328\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CHMP3 contributes catalytically or only positionally needed clarification\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Provided the structural and disease framework: crystal structures of the catalytic domain and the MIT–CHMP3 interface explained the high-affinity ESCRT engagement, while knockout mice showed ubiquitinated aggregate accumulation with co-trapped TDP-43, glutamate receptors, and p62.\",\n      \"evidence\": \"X-ray crystallography, ITC/SPR, thermodynamic unfolding, HIV-1 budding assay, and knockout-mouse immunohistochemistry\",\n      \"pmids\": [\"21888914\", \"21827950\", \"21531206\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Autoinhibitory role of the MIT domain not yet recognized\", \"In vivo substrate hierarchy in neurons unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Connected enzyme mechanism to human disease, showing proximal-ubiquitin recognition drives K63 specificity and that the MIC-CAP mutation T313I abolishes catalysis, while patient cells reveal aggregate accumulation, apoptosis, and constitutive RAS-MAPK/PI3K-AKT-mTOR signaling.\",\n      \"evidence\": \"Kinetic and mutational analyses with purified STAM, plus whole-exome sequencing and patient cell-line pathway/apoptosis assays\",\n      \"pmids\": [\"24151880\", \"23542699\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How catalytic loss drives pathway hyperactivation mechanistically unclear\", \"Capillary malformation phenotype mechanism unaddressed\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Refined the activation model by showing the STAM VHS domain tunes chain-length preference and directs distal-bond cleavage, lowering Km for longer K63 chains.\",\n      \"evidence\": \"In vitro cleavage kinetics with STAM domain truncations and chain-length panels\",\n      \"pmids\": [\"26601948\", \"25070368\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological chain lengths on real cargo not measured\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Extended STAMBP function to innate immunity by showing it stabilizes NALP7 and controls IL-1\\u03b2 release, and that a small-molecule inhibitor reproduces loss of function.\",\n      \"evidence\": \"siRNA, Co-IP, ubiquitination assays, BC-1471 inhibitor treatment, and IL-1\\u03b2 ELISA\",\n      \"pmids\": [\"28492230\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Linkage specificity on NALP7 not defined\", \"Inhibitor selectivity not fully characterized\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined STAMBP as a negative regulator of the NLRP3 inflammasome acting by removing K63 chains from NLRP3 without changing its abundance.\",\n      \"evidence\": \"CRISPR/Cas9 knockout in monocytes, ubiquitination assays, and inflammasome/cytokine readouts\",\n      \"pmids\": [\"33253913\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Recruitment to NLRP3 not mapped\", \"In vivo inflammatory role untested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established pharmacological tractability and EGFR regulation, developing ubiquitin-variant inhibitors with a JAMM–UbV crystal structure and showing STAMBP stabilizes EGFR to sustain MAPK/ERK signaling.\",\n      \"evidence\": \"Phage display, X-ray crystallography of STAMBPL1-UbV, in vitro inhibition assays, plus siRNA and EGFR stability/xenograft assays\",\n      \"pmids\": [\"34425109\", \"34102455\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular efficacy of UbV inhibitors not shown\", \"EGFR linkage type in this context not detailed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Broadened substrate scope beyond K63 by showing STAMBP removes K48 chains from RAI14 to block proteasomal degradation, supporting tumor growth.\",\n      \"evidence\": \"IP-mass spectrometry, Co-IP, ubiquitination assays, siRNA, and xenograft model\",\n      \"pmids\": [\"36434041\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reconciliation of K48 activity with reported K63 specificity unaddressed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Cemented the brain-specific requirement and therapeutic potential, with CNS-specific knockout phenocopying microcephaly and AAV9 gene supplementation rescuing defects, while human models linked catalytic function to neurogenesis via NSC proliferation and CFLAR-dependent survival.\",\n      \"evidence\": \"Conditional knockout mice with AAV9 rescue, hESC cortical organoid KO with wild-type vs. mutant rescue, and NPC expansion/CFLAR rescue assays\",\n      \"pmids\": [\"39169623\", \"36033615\", \"38951308\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct neuronal substrates driving death not pinpointed\", \"How catalytic loss lowers CFLAR mechanistically unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Resolved the activation switch and expanded oncogenic substrate networks, showing the MIT domain autoinhibits the catalytic domain (relieved by STAM but not CHMP3) and that IKK\\u03b1 phosphorylation at Ser2 activates substrate-specific deubiquitination of BAG3, with additional cancer substrates ER\\u03b1, CXCR4, and YY1.\",\n      \"evidence\": \"X-ray crystallography of the MIT-CD complex with biochemical validation, mass spectrometry, Co-IP, site-specific ubiquitination assays, and xenograft models\",\n      \"pmids\": [\"40441142\", \"41611844\", \"41301420\", \"41559433\", \"41456274\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mix of K48 and K63 substrate claims not mechanistically unified\", \"Several cancer-substrate findings rest on single-lab Co-IP without structural validation\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how STAMBP's endosomal/ESCRT-coupled K63 deubiquitination relates mechanistically to its reported K48-cleaving, proteasome-sparing roles on cytosolic and nuclear substrates, and how catalytic loss produces the specific neuronal death and pathway hyperactivation of MIC-CAP.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking linkage specificity to substrate localization\", \"Direct disease-relevant neuronal substrates uncharacterized\", \"Mechanism of constitutive RAS-MAPK/PI3K-AKT-mTOR activation unexplained\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 11, 15, 20, 21, 23, 25, 27]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 11, 22]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [5, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0, 4, 5, 25]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [15]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 1, 4, 25]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 7, 11, 23]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [20, 21]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [14, 30]}\n    ],\n    \"complexes\": [\"ESCRT-III\"],\n    \"partners\": [\"STAM\", \"CHMP3\", \"CHMP1A\", \"CHMP1B\", \"CHMP2A\", \"CLTC\", \"RNF11\", \"SMURF2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}