{"gene":"FAU","run_date":"2026-06-09T23:54:43","timeline":{"discoveries":[{"year":1992,"finding":"FAU encodes a fusion protein consisting of a ubiquitin-like protein (FUBI) fused in-frame to ribosomal protein S30 (eS30), forming a single 133 amino acid precursor protein expressed ubiquitously from a housekeeping-type gene with no TATA box.","method":"cDNA cloning, genomic structure analysis, sequence analysis","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — foundational structural finding independently confirmed across multiple labs and species (PMID:1326960, PMID:8395683)","pmids":["1326960","8395683"],"is_preprint":false},{"year":1993,"finding":"The FUBI ubiquitin-like domain of FAU conserves amino acid residues known to be involved in the ATP-dependent proteolytic activity of ubiquitin, suggesting it can participate in ubiquitin-like conjugation chemistry.","method":"Sequence analysis and comparative biochemistry of conserved residues","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — sequence-based inference corroborated by multiple subsequent functional studies showing covalent conjugation activity","pmids":["8395683"],"is_preprint":false},{"year":2004,"finding":"FAU (fau sense orientation overexpression) induces apoptosis that is inhibited by Bcl-2 and by caspase inhibitors, placing FAU upstream of the caspase cascade; antisense fau suppresses endogenous fau mRNA and confers resistance to dexamethasone-, UV-, and cisplatin-induced apoptosis.","method":"Functional expression cloning, antisense suppression, colony-forming assay, overexpression with pharmacological inhibitors","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (antisense knockdown, sense OE, pharmacological inhibition), single lab","pmids":["15543234"],"is_preprint":false},{"year":2006,"finding":"The FAU ubiquitin-like domain (MNSFβ/FUBI) covalently binds to the pro-apoptotic protein Bcl-G; the MNSFβ·Bcl-G complex associates with ERK1/2 and directly inhibits ERK activation by MEK1; siRNA knockdown of MNSFβ enhances LPS-induced ERK1/2 activation and TNFα production in macrophages.","method":"Co-immunoprecipitation, siRNA knockdown, ERK activation assay, TNFα ELISA, transfection of MNSFβ expression construct","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and functional siRNA/OE with defined readout, single lab","pmids":["16621790"],"is_preprint":false},{"year":2011,"finding":"FAU promotes apoptosis in human T-cell lines through a pathway requiring Bcl-G; prior knockdown of Bcl-G ablates FAU-induced basal apoptosis, establishing Bcl-G as an essential downstream effector of FAU-mediated apoptosis.","method":"Ectopic FAU expression, siRNA knockdown of FAU and Bcl-G, apoptosis assays (flow cytometry), UV-induced apoptosis assays","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis by double knockdown with defined phenotypic readout, single lab","pmids":["21550398"],"is_preprint":false},{"year":2010,"finding":"MNSFβ/FUBI covalently conjugates to endophilin II; the MNSFβ/endophilin II complex inhibits Dectin-1-mediated phagocytosis and suppresses the signal pathway upstream of IKK activation (but not downstream of TLR2 signaling) in macrophages.","method":"Co-immunoprecipitation, siRNA knockdown of endophilin II and MNSFβ, phagocytosis assay, TNFα measurement, IκBα degradation assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional siRNA knockdown with pathway placement, single lab","pmids":["20849826"],"is_preprint":false},{"year":2013,"finding":"MNSFβ/FUBI covalently binds to Bcl-G via a linkage requiring the C-terminal Gly74 of MNSFβ (G74A mutant abolishes enhancement of apoptosis); the MNSFβ-Bcl-G complex promotes LPS/IFNγ-induced apoptosis in macrophages and down-regulates the ERK/AP-1 signaling cascade, leading to decreased Cox-2 activity.","method":"Site-directed mutagenesis (G74A), co-transfection, siRNA knockdown, apoptosis assays, EMSA for AP-1 activity, Cox-2 activity measurement","journal":"The FEBS journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis of conjugation site combined with functional apoptosis and signaling assays, single lab but multiple orthogonal methods","pmids":["23298187"],"is_preprint":false},{"year":2015,"finding":"MNSFβ/FUBI purified covalently conjugates to cytosolic 10-formyltetrahydrofolate dehydrogenase (FDH) via a linkage between C-terminal Gly74 of MNSFβ and Lys72 of FDH; this complex is induced by dexamethasone in thymocytes and its double knockdown strongly reduces dexamethasone-induced apoptosis.","method":"Sequential chromatography purification, MALDI-TOF MS fingerprinting, siRNA double knockdown, apoptosis assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro purification with mass spectrometry identification of conjugation site, functional siRNA validation, single lab","pmids":["26192119"],"is_preprint":false},{"year":2016,"finding":"MNSFβ/FUBI noncovalently binds to HSPA8 (HSC70/heat shock 70-kDa protein 8) in the presence of ATP in vitro; double knockdown of MNSFβ and HSPA8 inhibits RANKL-induced osteoclastogenesis and suppresses RANKL-induced ERK1/2, p38 phosphorylation, and TNFα production.","method":"MALDI-TOF MS fingerprinting, in vitro binding assay with ATP, siRNA double knockdown, osteoclastogenesis assay, phospho-ERK/p38 immunoblot","journal":"Molecular and cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro binding assay with ATP-dependence plus functional double-knockdown, single lab","pmids":["27581120"],"is_preprint":false},{"year":2017,"finding":"FAU silencing by siRNA rescues F508del-CFTR function in bronchial epithelial cells by increasing plasma membrane targeting and anion transport of mutant CFTR; FAU shows preferential physical interaction with mutant (F508del) CFTR but not wild-type CFTR, and this interaction leads to mutant CFTR degradation.","method":"High-throughput siRNA screen, CFTR functional assay (anion transport), Co-immunoprecipitation, plasma membrane trafficking assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional screen validated by Co-IP and plasma membrane trafficking assay, single lab","pmids":["29158263"],"is_preprint":false},{"year":2019,"finding":"MNSFβ/FUBI covalently conjugates to HSP60 via a linkage between C-terminal Gly74 of MNSFβ and Lys481 of HSP60; HSP60 siRNA reverses the inhibition of apoptosis caused by MNSFβ siRNA in LPS/IFNγ-stimulated macrophages, indicating HSP60 negatively regulates MNSFβ biological activity.","method":"GST-pulldown purification, MALDI-TOF MS fingerprinting of conjugation site, siRNA knockdown, apoptosis and TNFα assay","journal":"Molecular and cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — mass-spec identification of conjugation site with functional siRNA epistasis, single lab","pmids":["30710197"],"is_preprint":false},{"year":2021,"finding":"Processing of the FUBI-eS30 fusion protein (encoded by FAU) is required for cytoplasmic 40S ribosomal subunit maturation; non-cleavable FUBI-eS30 mutants impair 18S rRNA maturation and prevent recycling of late-acting ribosome biogenesis factors. The deubiquitinase USP36 is identified as the FUBI-eS30 processing protease: USP36 depletion by RNAi or CRISPRi impairs FUBI-eS30 cleavage, and purified USP36 cleaves FUBI-eS30 in vitro.","method":"Non-cleavable mutant expression, differential affinity purification, RNAi/CRISPRi depletion of USP36, in vitro cleavage assay with purified USP36, rRNA maturation analysis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of cleavage by purified USP36, complemented by RNAi/CRISPRi and non-cleavable mutants with ribosome biogenesis readout","pmids":["34318747"],"is_preprint":false},{"year":2021,"finding":"MNSFβ/FUBI interacts with RC3H1 (a suppressor of TNFα transcription) in macrophages; this interaction promotes TNFα production, and specific knockdown of MNSFβ decreases TNFα production in a manner reversible by RC3H1 inhibition.","method":"Co-immunoprecipitation in THP1-derived macrophages, siRNA knockdown of MNSFβ and RC3H1, TNFα measurement","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with reciprocal siRNA epistasis, single lab","pmids":["34589082"],"is_preprint":false},{"year":2021,"finding":"MNSFβ/FUBI covalently conjugates to IGF2BP2 in trophoblasts, stabilizing IGF2BP2 protein and thereby promoting trophoblast invasiveness; trophoblast-specific knockout of MNSFβ in mice causes limited trophoblast invasion, embryonic growth retardation, and fetal loss.","method":"Trophoblast-specific Cre knockout mouse, Co-immunoprecipitation, immunoblotting, Transwell invasion assay, IHC/IF","journal":"Cell proliferation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional knockout with defined phenotype plus Co-IP of conjugation, single lab","pmids":["34668606"],"is_preprint":false},{"year":2023,"finding":"Crystal structures of USP36 complexed with FUBI and with ubiquitin reveal the substrate recognition mechanism of USP36 for FUBI; structural basis explains why most other deubiquitinases cannot cleave FUBI. USP16 is identified as a second dual ubiquitin/FUBI deubiquitinase with a synergistic role in FUBI-S30 maturation, discovered by chemoproteomics using FUBI-based activity-based probes.","method":"Crystal structure determination of USP36-FUBI and USP36-ubiquitin complexes, chemoproteomics with FUBI activity-based probes, FUBI C-terminal hydrolase activity assay, USP16 functional characterization","journal":"Nature chemical biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structures with functional validation by activity-based probes and biochemical assays in one study","pmids":["37443395"],"is_preprint":false},{"year":2024,"finding":"MNSFβ/FUBI (residues 101-133) interacts with RC3H1 (residues 81-326); MNSFβ promotes LPS-induced TNFα expression by facilitating stress granule (SG) formation and translocation of RC3H1 to SGs (via interaction with RC3H1 and FMR1), thereby inactivating RC3H1's promotion of TNFα mRNA degradation.","method":"Peptide-mapping Co-immunoprecipitation, stress granule imaging, siRNA knockdown, TNFα mRNA stability assay, designed inhibitory peptide (HEPN2) rescue experiments","journal":"International immunopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mapping by Co-IP, functional imaging of stress granules, siRNA epistasis, single lab","pmids":["39260307"],"is_preprint":false},{"year":2025,"finding":"Using synthetic FUBI chemical tools (activity-based probes, di-FUBI), IMPDH1 and UCHL3 are identified as novel di-FUBI-specific interactors; di-FUBI inhibits UCHL3 deubiquitinase cleavage activity in a concentration-dependent manner, revealing a regulatory interplay between UCHL3 and FUBI chains.","method":"Synthetic FUBI platform with activity-based probes, chemoproteomics in cell lysates, in vitro UCHL3 cleavage inhibition assay","journal":"Chembiochem","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical assay for UCHL3 inhibition with chemoproteomics identification, single lab, novel findings not yet replicated","pmids":["40464359"],"is_preprint":false},{"year":2005,"finding":"The FUBI ubiquitin-like domain (Ubi-L) of FAU noncovalently and specifically binds to histone 2A; free Ubi-L is detected in nuclei of T cells and nuclear Ubi-L adducts increase upon mitogen activation, suggesting a nuclear role for FUBI.","method":"GST-pulldown binding assay, nuclear fractionation, immunodetection of Ubi-L in nuclear/chromatin fractions","journal":"Comparative biochemistry and physiology. Part B","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single pulldown/fractionation experiment, single lab, no functional consequence established","pmids":["15649767"],"is_preprint":false},{"year":2003,"finding":"When FAU's two domains are expressed separately, only the FUBI domain transforms human osteogenic sarcoma (HOS) cells to anchorage-independence, while only the S30 domain confers arsenite resistance, functionally dissociating the two domains of the FAU fusion protein.","method":"Domain-separated expression constructs, soft agar anchorage-independence assay, arsenite resistance assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional domain dissection by separate expression constructs with two distinct phenotypic readouts, single lab","pmids":["12660817"],"is_preprint":false},{"year":2014,"finding":"In C. elegans, knockdown of Ce-rps30 (FAU ortholog) confers extended lifespan, increased lipid storage, and shortened body length comparable to dauer larvae; the S30 domain localizes to the nucleus while the UBiL (FUBI) domain accumulates in the cytoplasm, and synergism between the two domains regulates lifespan and reproduction.","method":"RNAi knockdown in C. elegans, transgenic overexpression, subcellular localization by fluorescent reporter, lifespan and phenotype assays","journal":"International journal for parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain localization by live imaging with functional consequence via genetic loss-of-function, ortholog study","pmids":["25058511"],"is_preprint":false}],"current_model":"FAU encodes a precursor fusion protein (FUBI–eS30) in which the ubiquitin-like domain FUBI must be proteolytically cleaved from ribosomal protein eS30 by the deubiquitinase USP36 (with USP16 acting synergistically) to enable cytoplasmic 40S ribosome maturation; the free FUBI domain acts as a ubiquitin-like modifier that covalently conjugates (via its C-terminal Gly74) to multiple substrates including Bcl-G, endophilin II, FDH, HSP60, and IGF2BP2, and noncovalently associates with HSPA8, HSP60, and RC3H1, thereby regulating apoptosis (through a Bcl-G-dependent pathway requiring caspases), ERK-MAPK and TLR signaling in macrophages, trophoblast invasion, and ribosome biogenesis, consistent with its role as a candidate tumor suppressor whose loss promotes cell survival and chemoresistance."},"narrative":{"mechanistic_narrative":"FAU encodes a precursor fusion protein in which a ubiquitin-like domain (FUBI/MNSFβ) is joined in-frame to ribosomal protein eS30 (S30), expressed ubiquitously from a housekeeping gene [PMID:1326960, PMID:8395683]. Proteolytic separation of the two domains is an obligatory maturation step: the deubiquitinase USP36 cleaves FUBI-eS30, and this processing is required for cytoplasmic 40S ribosomal subunit maturation, 18S rRNA processing, and recycling of late-acting biogenesis factors, while non-cleavable mutants block these steps [PMID:34318747]. USP36 substrate selectivity for FUBI is explained at the structural level, and USP16 acts as a second, synergistic FUBI-deconjugating enzyme [PMID:37443395]. The liberated FUBI domain functions as a ubiquitin-like modifier that covalently conjugates to target proteins via its C-terminal Gly74, including the pro-apoptotic protein Bcl-G, 10-formyltetrahydrofolate dehydrogenase (FDH) at Lys72, HSP60 at Lys481, and IGF2BP2 [PMID:23298187, PMID:26192119, PMID:30710197, PMID:34668606]. Through these conjugations FAU acts as a pro-apoptotic, caspase-dependent regulator whose ectopic expression induces apoptosis blocked by Bcl-2 and caspase inhibitors, and whose loss confers resistance to dexamethasone-, UV-, and cisplatin-induced cell death; Bcl-G is an essential downstream effector of this apoptotic activity [PMID:15543234, PMID:21550398, PMID:23298187]. In macrophages FUBI tunes innate-immune signaling: the FUBI·Bcl-G complex inhibits MEK1-driven ERK1/2 activation and AP-1/Cox-2 output, FUBI-endophilin II suppresses Dectin-1 phagocytic signaling upstream of IKK, and FUBI controls LPS-induced TNFα by binding RC3H1 and driving its sequestration into stress granules to relieve TNFα mRNA decay [PMID:16621790, PMID:20849826, PMID:23298187, PMID:39260307]. Beyond signaling, FUBI noncovalently associates with HSPA8 in an ATP-dependent manner during osteoclastogenesis and, through covalent conjugation that stabilizes IGF2BP2, promotes trophoblast invasion, with trophoblast-specific knockout causing embryonic growth retardation and fetal loss [PMID:27581120, PMID:34668606].","teleology":[{"year":1992,"claim":"Established the unusual architecture of the gene — a ubiquitin-like domain (FUBI) fused to a ribosomal protein (eS30) — defining the central question of how one transcript serves two functions.","evidence":"cDNA cloning and genomic structure/sequence analysis of the 133-aa precursor","pmids":["1326960","8395683"],"confidence":"High","gaps":["Did not establish whether or how the fusion is processed","No functional role assigned to either domain"]},{"year":1993,"claim":"Inferred that FUBI retains the conserved residues needed for ubiquitin-like conjugation chemistry, raising the possibility it acts as a covalent modifier rather than a vestigial domain.","evidence":"Comparative sequence analysis of conserved catalytic/conjugation residues","pmids":["8395683"],"confidence":"Medium","gaps":["Sequence inference only — no demonstration of actual conjugation","No substrate identified"]},{"year":2003,"claim":"Showed the two FAU domains carry separable functions, with FUBI driving anchorage-independent transformation and S30 conferring arsenite resistance, supporting the idea that the cleavage products act independently.","evidence":"Domain-separated expression constructs with soft-agar and arsenite-resistance assays in HOS cells","pmids":["12660817"],"confidence":"Medium","gaps":["Did not identify the protease responsible for separation","Mechanism of transformation by FUBI not defined"]},{"year":2004,"claim":"Defined FAU as a pro-apoptotic, caspase-upstream factor and linked its loss to chemoresistance, establishing a candidate tumor-suppressor role.","evidence":"Sense/antisense expression, colony-forming assays, Bcl-2 and caspase inhibitor blockade of apoptosis","pmids":["15543234"],"confidence":"Medium","gaps":["Molecular effector of apoptosis unknown","Which domain mediates the apoptotic effect not resolved"]},{"year":2005,"claim":"Probed a possible nuclear role for free FUBI through specific binding to histone 2A and detection of nuclear FUBI adducts after mitogen activation.","evidence":"GST-pulldown, nuclear fractionation, immunodetection in T cells","pmids":["15649767"],"confidence":"Low","gaps":["Single pulldown/fractionation without functional consequence","Significance of histone 2A binding never followed up"]},{"year":2006,"claim":"Identified Bcl-G as a covalent FUBI conjugate and placed the FUBI·Bcl-G complex as an inhibitor of MEK1-driven ERK signaling, connecting FUBI to macrophage inflammatory output.","evidence":"Reciprocal Co-IP, siRNA knockdown, ERK activation and TNFα assays in macrophages","pmids":["16621790"],"confidence":"Medium","gaps":["Conjugation site not yet mapped","Single lab"]},{"year":2011,"claim":"Demonstrated by genetic epistasis that Bcl-G is an essential downstream effector of FAU-induced apoptosis, fixing the order of the apoptotic pathway.","evidence":"Double siRNA knockdown of FAU and Bcl-G with flow-cytometry apoptosis readout in T-cell lines","pmids":["21550398"],"confidence":"Medium","gaps":["Does not explain how the FUBI-Bcl-G complex engages the caspase machinery","Single lab"]},{"year":2010,"claim":"Expanded the FUBI conjugation repertoire to endophilin II and placed the complex upstream of IKK in Dectin-1 phagocytic signaling, broadening FUBI's role in innate immunity.","evidence":"Co-IP, siRNA knockdown, phagocytosis and IκBα degradation assays in macrophages","pmids":["20849826"],"confidence":"Medium","gaps":["Conjugation site not mapped","Single lab"]},{"year":2013,"claim":"Pinpointed C-terminal Gly74 as the conjugation residue (G74A abolishes activity), establishing FUBI as a bona fide covalent ubiquitin-like modifier driving macrophage apoptosis and ERK/AP-1/Cox-2 suppression.","evidence":"Site-directed G74A mutagenesis, co-transfection, EMSA for AP-1, Cox-2 activity assays","pmids":["23298187"],"confidence":"High","gaps":["Conjugating enzyme machinery (E1/E2/E3-like) for FUBI not identified","Single lab"]},{"year":2015,"claim":"Mapped a defined FUBI conjugation site (Gly74-Lys72) on FDH and linked the conjugate to dexamethasone-induced thymocyte apoptosis, providing biochemical proof of substrate specificity.","evidence":"Chromatographic purification, MALDI-TOF MS site mapping, siRNA double knockdown, apoptosis assay","pmids":["26192119"],"confidence":"Medium","gaps":["Functional consequence of FDH conjugation at the enzymatic level unclear","Single lab"]},{"year":2016,"claim":"Showed FUBI noncovalently binds the chaperone HSPA8 in an ATP-dependent manner and participates in RANKL-driven osteoclastogenesis, extending FUBI interactions beyond covalent conjugation.","evidence":"MS fingerprinting, in vitro ATP-dependent binding, siRNA double knockdown, osteoclastogenesis and phospho-ERK/p38 assays","pmids":["27581120"],"confidence":"Medium","gaps":["Structural basis of ATP-dependent binding unknown","Single lab"]},{"year":2017,"claim":"Revealed a distinct quality-control role in which FAU preferentially binds mutant F508del-CFTR and targets it for degradation, such that FAU silencing rescues mutant CFTR trafficking.","evidence":"High-throughput siRNA screen, CFTR anion-transport and trafficking assays, Co-IP in bronchial epithelial cells","pmids":["29158263"],"confidence":"Medium","gaps":["Whether FUBI conjugation mediates the CFTR interaction not established","Single lab"]},{"year":2019,"claim":"Added HSP60 (Gly74-Lys481) as a FUBI conjugate that negatively regulates FUBI's pro-apoptotic activity, defining a built-in regulatory brake on FUBI signaling.","evidence":"GST-pulldown, MALDI-TOF MS site mapping, siRNA epistasis, apoptosis/TNFα assays in macrophages","pmids":["30710197"],"confidence":"Medium","gaps":["Mechanism by which HSP60 conjugation suppresses FUBI activity unknown","Single lab"]},{"year":2021,"claim":"Resolved the central processing question: USP36 cleaves FUBI-eS30, and this step is required for cytoplasmic 40S maturation, linking FAU directly to ribosome biogenesis.","evidence":"Non-cleavable mutants, RNAi/CRISPRi USP36 depletion, in vitro cleavage with purified USP36, rRNA maturation analysis","pmids":["34318747"],"confidence":"High","gaps":["Regulation of USP36-mediated processing not defined","Fate of liberated FUBI relative to its conjugation activity not connected"]},{"year":2021,"claim":"Connected FUBI to TNFα regulation via interaction with the decay factor RC3H1, and to placental development via covalent stabilization of IGF2BP2, demonstrating in vivo physiological roles.","evidence":"Co-IP and siRNA epistasis in THP1 macrophages; trophoblast-specific Cre knockout mouse, Co-IP, invasion assays","pmids":["34589082","34668606"],"confidence":"Medium","gaps":["RC3H1 binding mode not yet mapped at this stage","IGF2BP2 conjugation site not defined"]},{"year":2023,"claim":"Provided the structural basis for USP36's selectivity toward FUBI and identified USP16 as a synergistic second FUBI-deconjugating enzyme, explaining why most DUBs cannot process FUBI.","evidence":"Crystal structures of USP36-FUBI and USP36-ubiquitin, chemoproteomics with FUBI activity-based probes, hydrolase assays","pmids":["37443395"],"confidence":"High","gaps":["Relative in vivo contributions of USP36 vs USP16 not quantified","No conjugating enzymes identified"]},{"year":2024,"claim":"Refined the FUBI–RC3H1 mechanism, showing FUBI (101-133) binds RC3H1 (81-326) and drives RC3H1 into stress granules together with FMR1 to relieve TNFα mRNA decay.","evidence":"Peptide-mapping Co-IP, stress granule imaging, TNFα mRNA stability assays, inhibitory peptide rescue","pmids":["39260307"],"confidence":"Medium","gaps":["Whether this requires covalent FUBI conjugation unresolved","Single lab"]},{"year":2025,"claim":"Used synthetic FUBI/di-FUBI tools to uncover IMPDH1 and UCHL3 as di-FUBI interactors and showed di-FUBI inhibits UCHL3, hinting at FUBI-chain-based regulation analogous to ubiquitin chains.","evidence":"Synthetic FUBI activity-based probes, chemoproteomics, in vitro UCHL3 cleavage inhibition assay","pmids":["40464359"],"confidence":"Medium","gaps":["Existence and biological role of FUBI chains in cells not demonstrated","Novel findings not yet replicated"]},{"year":null,"claim":"The enzymatic machinery that conjugates FUBI to its substrates (FUBI E1/E2/E3 equivalents) and the cellular regulation balancing FUBI-eS30 processing against free-FUBI conjugation remain unknown.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No FUBI-activating/conjugating enzymes identified","How processing and conjugation pools are coordinated is unresolved","Tumor-suppressor role not validated in vivo"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0031386","term_label":"protein tag activity","supporting_discovery_ids":[1,6,7,10,13]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,11]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[3,6,12,15]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[11,19]},{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[0,11]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[17,19]}],"pathway":[{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[2,4,6]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[3,5,12,15]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[11,14]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[11]}],"complexes":[],"partners":["BCL2L14","USP36","USP16","HSPA8","HSPD1","RC3H1","IGF2BP2","ALDH1L1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P62861","full_name":"Ubiquitin-like FUBI-ribosomal protein eS30 fusion protein","aliases":["FAU ubiquitin like and ribosomal protein S30 fusion"],"length_aa":133,"mass_kda":14.4,"function":"May have pro-apoptotic activity Component of the 40S subunit of the ribosome. Contributes to the assembly and function of 40S ribosomal subunits","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/P62861/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/FAU","classification":"Common Essential","n_dependent_lines":1208,"n_total_lines":1208,"dependency_fraction":1.0},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000149806","cell_line_id":"CID001024","localizations":[{"compartment":"cytoplasmic","grade":3},{"compartment":"nucleolus_gc","grade":1}],"interactors":[{"gene":"PSPC1","stoichiometry":10.0},{"gene":"SRP68","stoichiometry":10.0},{"gene":"BYSL","stoichiometry":4.0},{"gene":"METAP2","stoichiometry":4.0},{"gene":"TSR1","stoichiometry":4.0},{"gene":"CAPZB","stoichiometry":0.2},{"gene":"CLNS1A","stoichiometry":0.2},{"gene":"DDX21","stoichiometry":0.2},{"gene":"DRG1","stoichiometry":0.2},{"gene":"EIF3B","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001024","total_profiled":1310},"omim":[{"mim_id":"608455","title":"GLYCOGEN PHOSPHORYLASE, MUSCLE; PYGM","url":"https://www.omim.org/entry/608455"},{"mim_id":"606866","title":"MITOCHONDRIAL RIBOSOMAL PROTEIN L49; MRPL49","url":"https://www.omim.org/entry/606866"},{"mim_id":"604575","title":"ZINC FINGER HIT DOMAIN-CONTAINING PROTEIN 2; ZNHIT2","url":"https://www.omim.org/entry/604575"},{"mim_id":"603414","title":"TRANSMEMBRANE 7 SUPERFAMILY, MEMBER 2; TM7SF2","url":"https://www.omim.org/entry/603414"},{"mim_id":"601671","title":"D4, ZINC, AND DOUBLE PHD FINGERS FAMILY, MEMBER 2; DPF2","url":"https://www.omim.org/entry/601671"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Endoplasmic reticulum","reliability":"Enhanced"},{"location":"Cytosol","reliability":"Enhanced"},{"location":"Nucleoli","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — foundational structural finding independently confirmed across multiple labs and species (PMID:1326960, PMID:8395683)\",\n      \"pmids\": [\"1326960\", \"8395683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"The FUBI ubiquitin-like domain of FAU conserves amino acid residues known to be involved in the ATP-dependent proteolytic activity of ubiquitin, suggesting it can participate in ubiquitin-like conjugation chemistry.\",\n      \"method\": \"Sequence analysis and comparative biochemistry of conserved residues\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — sequence-based inference corroborated by multiple subsequent functional studies showing covalent conjugation activity\",\n      \"pmids\": [\"8395683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"FAU (fau sense orientation overexpression) induces apoptosis that is inhibited by Bcl-2 and by caspase inhibitors, placing FAU upstream of the caspase cascade; antisense fau suppresses endogenous fau mRNA and confers resistance to dexamethasone-, UV-, and cisplatin-induced apoptosis.\",\n      \"method\": \"Functional expression cloning, antisense suppression, colony-forming assay, overexpression with pharmacological inhibitors\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (antisense knockdown, sense OE, pharmacological inhibition), single lab\",\n      \"pmids\": [\"15543234\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The FAU ubiquitin-like domain (MNSFβ/FUBI) covalently binds to the pro-apoptotic protein Bcl-G; the MNSFβ·Bcl-G complex associates with ERK1/2 and directly inhibits ERK activation by MEK1; siRNA knockdown of MNSFβ enhances LPS-induced ERK1/2 activation and TNFα production in macrophages.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, ERK activation assay, TNFα ELISA, transfection of MNSFβ expression construct\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and functional siRNA/OE with defined readout, single lab\",\n      \"pmids\": [\"16621790\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"FAU promotes apoptosis in human T-cell lines through a pathway requiring Bcl-G; prior knockdown of Bcl-G ablates FAU-induced basal apoptosis, establishing Bcl-G as an essential downstream effector of FAU-mediated apoptosis.\",\n      \"method\": \"Ectopic FAU expression, siRNA knockdown of FAU and Bcl-G, apoptosis assays (flow cytometry), UV-induced apoptosis assays\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis by double knockdown with defined phenotypic readout, single lab\",\n      \"pmids\": [\"21550398\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MNSFβ/FUBI covalently conjugates to endophilin II; the MNSFβ/endophilin II complex inhibits Dectin-1-mediated phagocytosis and suppresses the signal pathway upstream of IKK activation (but not downstream of TLR2 signaling) in macrophages.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown of endophilin II and MNSFβ, phagocytosis assay, TNFα measurement, IκBα degradation assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional siRNA knockdown with pathway placement, single lab\",\n      \"pmids\": [\"20849826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MNSFβ/FUBI covalently binds to Bcl-G via a linkage requiring the C-terminal Gly74 of MNSFβ (G74A mutant abolishes enhancement of apoptosis); the MNSFβ-Bcl-G complex promotes LPS/IFNγ-induced apoptosis in macrophages and down-regulates the ERK/AP-1 signaling cascade, leading to decreased Cox-2 activity.\",\n      \"method\": \"Site-directed mutagenesis (G74A), co-transfection, siRNA knockdown, apoptosis assays, EMSA for AP-1 activity, Cox-2 activity measurement\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis of conjugation site combined with functional apoptosis and signaling assays, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"23298187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MNSFβ/FUBI purified covalently conjugates to cytosolic 10-formyltetrahydrofolate dehydrogenase (FDH) via a linkage between C-terminal Gly74 of MNSFβ and Lys72 of FDH; this complex is induced by dexamethasone in thymocytes and its double knockdown strongly reduces dexamethasone-induced apoptosis.\",\n      \"method\": \"Sequential chromatography purification, MALDI-TOF MS fingerprinting, siRNA double knockdown, apoptosis assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro purification with mass spectrometry identification of conjugation site, functional siRNA validation, single lab\",\n      \"pmids\": [\"26192119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MNSFβ/FUBI noncovalently binds to HSPA8 (HSC70/heat shock 70-kDa protein 8) in the presence of ATP in vitro; double knockdown of MNSFβ and HSPA8 inhibits RANKL-induced osteoclastogenesis and suppresses RANKL-induced ERK1/2, p38 phosphorylation, and TNFα production.\",\n      \"method\": \"MALDI-TOF MS fingerprinting, in vitro binding assay with ATP, siRNA double knockdown, osteoclastogenesis assay, phospho-ERK/p38 immunoblot\",\n      \"journal\": \"Molecular and cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro binding assay with ATP-dependence plus functional double-knockdown, single lab\",\n      \"pmids\": [\"27581120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"FAU silencing by siRNA rescues F508del-CFTR function in bronchial epithelial cells by increasing plasma membrane targeting and anion transport of mutant CFTR; FAU shows preferential physical interaction with mutant (F508del) CFTR but not wild-type CFTR, and this interaction leads to mutant CFTR degradation.\",\n      \"method\": \"High-throughput siRNA screen, CFTR functional assay (anion transport), Co-immunoprecipitation, plasma membrane trafficking assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional screen validated by Co-IP and plasma membrane trafficking assay, single lab\",\n      \"pmids\": [\"29158263\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MNSFβ/FUBI covalently conjugates to HSP60 via a linkage between C-terminal Gly74 of MNSFβ and Lys481 of HSP60; HSP60 siRNA reverses the inhibition of apoptosis caused by MNSFβ siRNA in LPS/IFNγ-stimulated macrophages, indicating HSP60 negatively regulates MNSFβ biological activity.\",\n      \"method\": \"GST-pulldown purification, MALDI-TOF MS fingerprinting of conjugation site, siRNA knockdown, apoptosis and TNFα assay\",\n      \"journal\": \"Molecular and cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mass-spec identification of conjugation site with functional siRNA epistasis, single lab\",\n      \"pmids\": [\"30710197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Processing of the FUBI-eS30 fusion protein (encoded by FAU) is required for cytoplasmic 40S ribosomal subunit maturation; non-cleavable FUBI-eS30 mutants impair 18S rRNA maturation and prevent recycling of late-acting ribosome biogenesis factors. The deubiquitinase USP36 is identified as the FUBI-eS30 processing protease: USP36 depletion by RNAi or CRISPRi impairs FUBI-eS30 cleavage, and purified USP36 cleaves FUBI-eS30 in vitro.\",\n      \"method\": \"Non-cleavable mutant expression, differential affinity purification, RNAi/CRISPRi depletion of USP36, in vitro cleavage assay with purified USP36, rRNA maturation analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of cleavage by purified USP36, complemented by RNAi/CRISPRi and non-cleavable mutants with ribosome biogenesis readout\",\n      \"pmids\": [\"34318747\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MNSFβ/FUBI interacts with RC3H1 (a suppressor of TNFα transcription) in macrophages; this interaction promotes TNFα production, and specific knockdown of MNSFβ decreases TNFα production in a manner reversible by RC3H1 inhibition.\",\n      \"method\": \"Co-immunoprecipitation in THP1-derived macrophages, siRNA knockdown of MNSFβ and RC3H1, TNFα measurement\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with reciprocal siRNA epistasis, single lab\",\n      \"pmids\": [\"34589082\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MNSFβ/FUBI covalently conjugates to IGF2BP2 in trophoblasts, stabilizing IGF2BP2 protein and thereby promoting trophoblast invasiveness; trophoblast-specific knockout of MNSFβ in mice causes limited trophoblast invasion, embryonic growth retardation, and fetal loss.\",\n      \"method\": \"Trophoblast-specific Cre knockout mouse, Co-immunoprecipitation, immunoblotting, Transwell invasion assay, IHC/IF\",\n      \"journal\": \"Cell proliferation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional knockout with defined phenotype plus Co-IP of conjugation, single lab\",\n      \"pmids\": [\"34668606\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Crystal structures of USP36 complexed with FUBI and with ubiquitin reveal the substrate recognition mechanism of USP36 for FUBI; structural basis explains why most other deubiquitinases cannot cleave FUBI. USP16 is identified as a second dual ubiquitin/FUBI deubiquitinase with a synergistic role in FUBI-S30 maturation, discovered by chemoproteomics using FUBI-based activity-based probes.\",\n      \"method\": \"Crystal structure determination of USP36-FUBI and USP36-ubiquitin complexes, chemoproteomics with FUBI activity-based probes, FUBI C-terminal hydrolase activity assay, USP16 functional characterization\",\n      \"journal\": \"Nature chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structures with functional validation by activity-based probes and biochemical assays in one study\",\n      \"pmids\": [\"37443395\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MNSFβ/FUBI (residues 101-133) interacts with RC3H1 (residues 81-326); MNSFβ promotes LPS-induced TNFα expression by facilitating stress granule (SG) formation and translocation of RC3H1 to SGs (via interaction with RC3H1 and FMR1), thereby inactivating RC3H1's promotion of TNFα mRNA degradation.\",\n      \"method\": \"Peptide-mapping Co-immunoprecipitation, stress granule imaging, siRNA knockdown, TNFα mRNA stability assay, designed inhibitory peptide (HEPN2) rescue experiments\",\n      \"journal\": \"International immunopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mapping by Co-IP, functional imaging of stress granules, siRNA epistasis, single lab\",\n      \"pmids\": [\"39260307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Using synthetic FUBI chemical tools (activity-based probes, di-FUBI), IMPDH1 and UCHL3 are identified as novel di-FUBI-specific interactors; di-FUBI inhibits UCHL3 deubiquitinase cleavage activity in a concentration-dependent manner, revealing a regulatory interplay between UCHL3 and FUBI chains.\",\n      \"method\": \"Synthetic FUBI platform with activity-based probes, chemoproteomics in cell lysates, in vitro UCHL3 cleavage inhibition assay\",\n      \"journal\": \"Chembiochem\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical assay for UCHL3 inhibition with chemoproteomics identification, single lab, novel findings not yet replicated\",\n      \"pmids\": [\"40464359\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The FUBI ubiquitin-like domain (Ubi-L) of FAU noncovalently and specifically binds to histone 2A; free Ubi-L is detected in nuclei of T cells and nuclear Ubi-L adducts increase upon mitogen activation, suggesting a nuclear role for FUBI.\",\n      \"method\": \"GST-pulldown binding assay, nuclear fractionation, immunodetection of Ubi-L in nuclear/chromatin fractions\",\n      \"journal\": \"Comparative biochemistry and physiology. Part B\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single pulldown/fractionation experiment, single lab, no functional consequence established\",\n      \"pmids\": [\"15649767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"When FAU's two domains are expressed separately, only the FUBI domain transforms human osteogenic sarcoma (HOS) cells to anchorage-independence, while only the S30 domain confers arsenite resistance, functionally dissociating the two domains of the FAU fusion protein.\",\n      \"method\": \"Domain-separated expression constructs, soft agar anchorage-independence assay, arsenite resistance assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional domain dissection by separate expression constructs with two distinct phenotypic readouts, single lab\",\n      \"pmids\": [\"12660817\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In C. elegans, knockdown of Ce-rps30 (FAU ortholog) confers extended lifespan, increased lipid storage, and shortened body length comparable to dauer larvae; the S30 domain localizes to the nucleus while the UBiL (FUBI) domain accumulates in the cytoplasm, and synergism between the two domains regulates lifespan and reproduction.\",\n      \"method\": \"RNAi knockdown in C. elegans, transgenic overexpression, subcellular localization by fluorescent reporter, lifespan and phenotype assays\",\n      \"journal\": \"International journal for parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain localization by live imaging with functional consequence via genetic loss-of-function, ortholog study\",\n      \"pmids\": [\"25058511\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FAU encodes a precursor fusion protein (FUBI–eS30) in which the ubiquitin-like domain FUBI must be proteolytically cleaved from ribosomal protein eS30 by the deubiquitinase USP36 (with USP16 acting synergistically) to enable cytoplasmic 40S ribosome maturation; the free FUBI domain acts as a ubiquitin-like modifier that covalently conjugates (via its C-terminal Gly74) to multiple substrates including Bcl-G, endophilin II, FDH, HSP60, and IGF2BP2, and noncovalently associates with HSPA8, HSP60, and RC3H1, thereby regulating apoptosis (through a Bcl-G-dependent pathway requiring caspases), ERK-MAPK and TLR signaling in macrophages, trophoblast invasion, and ribosome biogenesis, consistent with its role as a candidate tumor suppressor whose loss promotes cell survival and chemoresistance.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"FAU encodes a precursor fusion protein in which a ubiquitin-like domain (FUBI/MNSFβ) is joined in-frame to ribosomal protein eS30 (S30), expressed ubiquitously from a housekeeping gene [#0]. Proteolytic separation of the two domains is an obligatory maturation step: the deubiquitinase USP36 cleaves FUBI-eS30, and this processing is required for cytoplasmic 40S ribosomal subunit maturation, 18S rRNA processing, and recycling of late-acting biogenesis factors, while non-cleavable mutants block these steps [#11]. USP36 substrate selectivity for FUBI is explained at the structural level, and USP16 acts as a second, synergistic FUBI-deconjugating enzyme [#14]. The liberated FUBI domain functions as a ubiquitin-like modifier that covalently conjugates to target proteins via its C-terminal Gly74, including the pro-apoptotic protein Bcl-G, 10-formyltetrahydrofolate dehydrogenase (FDH) at Lys72, HSP60 at Lys481, and IGF2BP2 [#6, #7, #10, #13]. Through these conjugations FAU acts as a pro-apoptotic, caspase-dependent regulator whose ectopic expression induces apoptosis blocked by Bcl-2 and caspase inhibitors, and whose loss confers resistance to dexamethasone-, UV-, and cisplatin-induced cell death; Bcl-G is an essential downstream effector of this apoptotic activity [#2, #4, #6]. In macrophages FUBI tunes innate-immune signaling: the FUBI·Bcl-G complex inhibits MEK1-driven ERK1/2 activation and AP-1/Cox-2 output, FUBI-endophilin II suppresses Dectin-1 phagocytic signaling upstream of IKK, and FUBI controls LPS-induced TNFα by binding RC3H1 and driving its sequestration into stress granules to relieve TNFα mRNA decay [#3, #5, #6, #15]. Beyond signaling, FUBI noncovalently associates with HSPA8 in an ATP-dependent manner during osteoclastogenesis and, through covalent conjugation that stabilizes IGF2BP2, promotes trophoblast invasion, with trophoblast-specific knockout causing embryonic growth retardation and fetal loss [#8, #13].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Established the unusual architecture of the gene — a ubiquitin-like domain (FUBI) fused to a ribosomal protein (eS30) — defining the central question of how one transcript serves two functions.\",\n      \"evidence\": \"cDNA cloning and genomic structure/sequence analysis of the 133-aa precursor\",\n      \"pmids\": [\"1326960\", \"8395683\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish whether or how the fusion is processed\", \"No functional role assigned to either domain\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Inferred that FUBI retains the conserved residues needed for ubiquitin-like conjugation chemistry, raising the possibility it acts as a covalent modifier rather than a vestigial domain.\",\n      \"evidence\": \"Comparative sequence analysis of conserved catalytic/conjugation residues\",\n      \"pmids\": [\"8395683\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Sequence inference only — no demonstration of actual conjugation\", \"No substrate identified\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Showed the two FAU domains carry separable functions, with FUBI driving anchorage-independent transformation and S30 conferring arsenite resistance, supporting the idea that the cleavage products act independently.\",\n      \"evidence\": \"Domain-separated expression constructs with soft-agar and arsenite-resistance assays in HOS cells\",\n      \"pmids\": [\"12660817\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not identify the protease responsible for separation\", \"Mechanism of transformation by FUBI not defined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined FAU as a pro-apoptotic, caspase-upstream factor and linked its loss to chemoresistance, establishing a candidate tumor-suppressor role.\",\n      \"evidence\": \"Sense/antisense expression, colony-forming assays, Bcl-2 and caspase inhibitor blockade of apoptosis\",\n      \"pmids\": [\"15543234\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular effector of apoptosis unknown\", \"Which domain mediates the apoptotic effect not resolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Probed a possible nuclear role for free FUBI through specific binding to histone 2A and detection of nuclear FUBI adducts after mitogen activation.\",\n      \"evidence\": \"GST-pulldown, nuclear fractionation, immunodetection in T cells\",\n      \"pmids\": [\"15649767\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single pulldown/fractionation without functional consequence\", \"Significance of histone 2A binding never followed up\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified Bcl-G as a covalent FUBI conjugate and placed the FUBI·Bcl-G complex as an inhibitor of MEK1-driven ERK signaling, connecting FUBI to macrophage inflammatory output.\",\n      \"evidence\": \"Reciprocal Co-IP, siRNA knockdown, ERK activation and TNFα assays in macrophages\",\n      \"pmids\": [\"16621790\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Conjugation site not yet mapped\", \"Single lab\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated by genetic epistasis that Bcl-G is an essential downstream effector of FAU-induced apoptosis, fixing the order of the apoptotic pathway.\",\n      \"evidence\": \"Double siRNA knockdown of FAU and Bcl-G with flow-cytometry apoptosis readout in T-cell lines\",\n      \"pmids\": [\"21550398\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not explain how the FUBI-Bcl-G complex engages the caspase machinery\", \"Single lab\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Expanded the FUBI conjugation repertoire to endophilin II and placed the complex upstream of IKK in Dectin-1 phagocytic signaling, broadening FUBI's role in innate immunity.\",\n      \"evidence\": \"Co-IP, siRNA knockdown, phagocytosis and IκBα degradation assays in macrophages\",\n      \"pmids\": [\"20849826\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Conjugation site not mapped\", \"Single lab\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Pinpointed C-terminal Gly74 as the conjugation residue (G74A abolishes activity), establishing FUBI as a bona fide covalent ubiquitin-like modifier driving macrophage apoptosis and ERK/AP-1/Cox-2 suppression.\",\n      \"evidence\": \"Site-directed G74A mutagenesis, co-transfection, EMSA for AP-1, Cox-2 activity assays\",\n      \"pmids\": [\"23298187\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conjugating enzyme machinery (E1/E2/E3-like) for FUBI not identified\", \"Single lab\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Mapped a defined FUBI conjugation site (Gly74-Lys72) on FDH and linked the conjugate to dexamethasone-induced thymocyte apoptosis, providing biochemical proof of substrate specificity.\",\n      \"evidence\": \"Chromatographic purification, MALDI-TOF MS site mapping, siRNA double knockdown, apoptosis assay\",\n      \"pmids\": [\"26192119\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of FDH conjugation at the enzymatic level unclear\", \"Single lab\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed FUBI noncovalently binds the chaperone HSPA8 in an ATP-dependent manner and participates in RANKL-driven osteoclastogenesis, extending FUBI interactions beyond covalent conjugation.\",\n      \"evidence\": \"MS fingerprinting, in vitro ATP-dependent binding, siRNA double knockdown, osteoclastogenesis and phospho-ERK/p38 assays\",\n      \"pmids\": [\"27581120\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of ATP-dependent binding unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Revealed a distinct quality-control role in which FAU preferentially binds mutant F508del-CFTR and targets it for degradation, such that FAU silencing rescues mutant CFTR trafficking.\",\n      \"evidence\": \"High-throughput siRNA screen, CFTR anion-transport and trafficking assays, Co-IP in bronchial epithelial cells\",\n      \"pmids\": [\"29158263\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether FUBI conjugation mediates the CFTR interaction not established\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Added HSP60 (Gly74-Lys481) as a FUBI conjugate that negatively regulates FUBI's pro-apoptotic activity, defining a built-in regulatory brake on FUBI signaling.\",\n      \"evidence\": \"GST-pulldown, MALDI-TOF MS site mapping, siRNA epistasis, apoptosis/TNFα assays in macrophages\",\n      \"pmids\": [\"30710197\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which HSP60 conjugation suppresses FUBI activity unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Resolved the central processing question: USP36 cleaves FUBI-eS30, and this step is required for cytoplasmic 40S maturation, linking FAU directly to ribosome biogenesis.\",\n      \"evidence\": \"Non-cleavable mutants, RNAi/CRISPRi USP36 depletion, in vitro cleavage with purified USP36, rRNA maturation analysis\",\n      \"pmids\": [\"34318747\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Regulation of USP36-mediated processing not defined\", \"Fate of liberated FUBI relative to its conjugation activity not connected\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connected FUBI to TNFα regulation via interaction with the decay factor RC3H1, and to placental development via covalent stabilization of IGF2BP2, demonstrating in vivo physiological roles.\",\n      \"evidence\": \"Co-IP and siRNA epistasis in THP1 macrophages; trophoblast-specific Cre knockout mouse, Co-IP, invasion assays\",\n      \"pmids\": [\"34589082\", \"34668606\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"RC3H1 binding mode not yet mapped at this stage\", \"IGF2BP2 conjugation site not defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Provided the structural basis for USP36's selectivity toward FUBI and identified USP16 as a synergistic second FUBI-deconjugating enzyme, explaining why most DUBs cannot process FUBI.\",\n      \"evidence\": \"Crystal structures of USP36-FUBI and USP36-ubiquitin, chemoproteomics with FUBI activity-based probes, hydrolase assays\",\n      \"pmids\": [\"37443395\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative in vivo contributions of USP36 vs USP16 not quantified\", \"No conjugating enzymes identified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Refined the FUBI–RC3H1 mechanism, showing FUBI (101-133) binds RC3H1 (81-326) and drives RC3H1 into stress granules together with FMR1 to relieve TNFα mRNA decay.\",\n      \"evidence\": \"Peptide-mapping Co-IP, stress granule imaging, TNFα mRNA stability assays, inhibitory peptide rescue\",\n      \"pmids\": [\"39260307\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether this requires covalent FUBI conjugation unresolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Used synthetic FUBI/di-FUBI tools to uncover IMPDH1 and UCHL3 as di-FUBI interactors and showed di-FUBI inhibits UCHL3, hinting at FUBI-chain-based regulation analogous to ubiquitin chains.\",\n      \"evidence\": \"Synthetic FUBI activity-based probes, chemoproteomics, in vitro UCHL3 cleavage inhibition assay\",\n      \"pmids\": [\"40464359\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Existence and biological role of FUBI chains in cells not demonstrated\", \"Novel findings not yet replicated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The enzymatic machinery that conjugates FUBI to its substrates (FUBI E1/E2/E3 equivalents) and the cellular regulation balancing FUBI-eS30 processing against free-FUBI conjugation remain unknown.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No FUBI-activating/conjugating enzymes identified\", \"How processing and conjugation pools are coordinated is unresolved\", \"Tumor-suppressor role not validated in vivo\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0031386\", \"supporting_discovery_ids\": [1, 6, 7, 10, 13]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 11]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 6, 12, 15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [11, 19]},\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [0, 11]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [17, 19]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [2, 4, 6]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [3, 5, 12, 15]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [11, 14]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"BCL2L14\", \"USP36\", \"USP16\", \"HSPA8\", \"HSPD1\", \"RC3H1\", \"IGF2BP2\", \"ALDH1L1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}