{"gene":"FUT8","run_date":"2026-04-28T17:46:04","timeline":{"discoveries":[{"year":2004,"finding":"FUT8 encodes an α-1,6-fucosyltransferase that catalyzes the transfer of fucose from GDP-fucose to N-acetylglucosamine in an α-1,6 linkage on N-glycans (core fucosylation); knockout of both FUT8 alleles in CHO cells completely abolishes core fucosylation of antibody Fc regions, dramatically enhancing FcγRIIIa binding and ADCC (~100-fold increase).","method":"Homologous recombination knockout in CHO cells, glycan analysis, FcγRIIIa binding assay, ADCC assay","journal":"Biotechnology and bioengineering","confidence":"High","confidence_rationale":"Tier 1 — enzymatic activity defined by KO with multiple orthogonal functional readouts, widely replicated","pmids":["15352059"],"is_preprint":false},{"year":2006,"finding":"Crystal structure of human FUT8 at 2.6 Å resolution reveals three domains: an N-terminal coiled-coil (α-helical) domain, a GT-B fold catalytic domain with a Rossmann fold housing the GDP-fucose donor binding site, and a C-terminal SH3 domain; conserved residues in the Rossmann fold participate in donor substrate binding and catalysis.","method":"X-ray crystallography at 2.6 Å resolution","journal":"Glycobiology","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with functional domain annotation, foundational structural paper","pmids":["17172260"],"is_preprint":false},{"year":2005,"finding":"FUT8 is a type II Golgi-localized membrane protein that follows a rapid equilibrium random kinetic mechanism; it strongly recognizes the base portion and diphosphoryl group of GDP-β-L-fucose as donor substrate; two conserved arginine residues play an important role in donor substrate binding.","method":"Large-scale recombinant protein production in baculovirus/insect cells, kinetic analysis, inhibition studies with GDP-fucose derivatives","journal":"Glycobiology","confidence":"High","confidence_rationale":"Tier 1 — in vitro enzymatic characterization with substrate analogs and mutagenesis-informed kinetic analysis","pmids":["16344263"],"is_preprint":false},{"year":2006,"finding":"Core fucosylation by Fut8 is required for normal TGF-β1 receptor and EGF receptor signaling; Fut8-null mice show severe growth retardation and emphysema-like lung destruction due to dysregulated TGF-β1 receptor activation, overexpression of MMP12/MMP13, and downregulation of elastin; reintroduction of Fut8 rescues receptor-mediated signaling in null cells.","method":"Fut8 knockout mouse phenotyping, TGF-β1 therapeutic rescue experiment, gene reintroduction rescue in null cells","journal":"Methods in enzymology","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with defined molecular phenotype, multiple receptors tested, rescue experiment performed","pmids":["17132494"],"is_preprint":false},{"year":2006,"finding":"Core fucosylation by Fut8 is required for normal LRP-1 scavenger/endocytic function; loss of Fut8 impairs LRP-1-mediated endocytosis of IGFBP-3, leading to markedly elevated serum IGFBP-3 in Fut8-null mice; reintroduction of Fut8 rescues endocytosis.","method":"Fut8 knockout mouse model, endocytosis assay, serum IGFBP-3 measurement, Fut8 gene reintroduction rescue","journal":"Journal of biochemistry","confidence":"High","confidence_rationale":"Tier 2 — KO with defined molecular phenotype and rescue, replicated in vivo and in vitro","pmids":["16567404"],"is_preprint":false},{"year":2009,"finding":"Fut8 is required for normal VEGFR-2 expression in the lung; knockdown of Fut8 suppresses VEGFR-2 mRNA and protein at the transcriptional level; loss of VEGFR-2 increases ceramide and apoptosis of septal epithelia and endothelia, contributing to emphysema-like changes in Fut8-/- mice.","method":"Fut8 KO mouse lung analysis, siRNA knockdown in A549/TGP49 cells, VEGFR-2 mRNA/protein quantification, TUNEL assay","journal":"Journal of biochemistry","confidence":"High","confidence_rationale":"Tier 2 — KO mouse + siRNA with defined mechanistic pathway and apoptotic readout","pmids":["19179362"],"is_preprint":false},{"year":2012,"finding":"Donor substrate GDP-fucose binding to FUT8 involves specific recognition of the guanine base by His363 and Asp453, tight binding of the pyrophosphate moiety, and simultaneous binding of Arg365 to both the β-phosphate and the fucose moiety; prior binding of GDP is required for optimal N-glycan acceptor recognition.","method":"STD NMR, SPR binding assays, in silico molecular docking and MD simulations based on structural analogy to cePOFUT","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 1/2 — STD NMR and SPR experimental validation of binding interactions, single lab","pmids":["22982178"],"is_preprint":false},{"year":2013,"finding":"α1,6-Fucosylation of activin receptors by Fut8 negatively regulates activin-mediated signaling (phospho-Smad2); knockdown of Fut8 in PC12 cells decreases α1,6-fucosylation of activin receptors and enhances activin-induced phospho-Smad2 and neurite formation, while restoring Fut8 reverses this; demonstrating a dual role for Fut8 in TGF-β versus activin signaling.","method":"siRNA knockdown in PC12 cells, phospho-Smad2 immunoblot, neurite formation assay, activin receptor lectin analysis, Fut8 re-expression rescue","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 — KD with defined molecular pathway + rescue, multiple orthogonal readouts","pmids":["23796784"],"is_preprint":false},{"year":2013,"finding":"FUT8 overexpression inhibits hemoglobin production and erythroid differentiation; the donor substrate-binding domain and a flexible loop are essential for this inhibitory function; FUT8 expression is positively regulated by c-Myc and c-Myb during erythroid differentiation.","method":"Gene expression profiling, overexpression and shRNA knockdown in murine erythroleukemia and K562 cells, domain mutagenesis, hemoglobin assay, transferrin receptor/glycophorin A FACS","journal":"Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — gain/loss-of-function with domain mutagenesis pinpointing functional regions, multiple cell lines","pmids":["23609441"],"is_preprint":false},{"year":2016,"finding":"Mammalian FUT8 is the sole enzyme responsible for GnT I-independent core fucosylation of high-mannose N-glycans (Man5GlcNAc2); knockdown of FUT8 in GnT I-/- HEK293S cells eliminates core fucosylation of high-mannose glycoforms, while FUT8 overexpression produces fully core-fucosylated oligomannose glycans.","method":"Lentivirus-mediated FUT8 knockdown and overexpression in HEK293S GnT I-/- cells, glycan analysis of recombinant EPO","journal":"Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — genetic gain/loss-of-function in defined cell background, direct glycan readout","pmids":["27008861"],"is_preprint":false},{"year":2017,"finding":"FUT8 mediates core fucosylation of TGF-β receptor complexes, enhancing TGF-β1 binding and downstream signaling to promote EMT and breast cancer invasion; FUT8 is transcriptionally upregulated during TGF-β-induced EMT, creating a positive feedback loop.","method":"shRNA/CRISPR KO and lentiviral overexpression, lectin blot, luciferase signaling assay, in vitro ligand binding assay, transwell invasion, mammary fat pad xenograft","journal":"Breast cancer research : BCR","confidence":"High","confidence_rationale":"Tier 2 — gain/loss-of-function with multiple orthogonal methods including in vivo model","pmids":["28982386"],"is_preprint":false},{"year":2017,"finding":"FUT8 silencing suppresses melanoma invasion and tumor dissemination; L1CAM is identified as a glycoprotein target of FUT8 core fucosylation, and core fucosylation of L1CAM impacts its cleavage and ability to support melanoma invasion.","method":"Systems-based glycomics of patient samples, siRNA silencing, in vitro invasion assays, in vivo tumor dissemination model, glycoprotein target enrichment","journal":"Cancer cell","confidence":"High","confidence_rationale":"Tier 2 — patient-derived systems data + in vitro/in vivo KD with identified glycoprotein substrate","pmids":["28609658"],"is_preprint":false},{"year":2018,"finding":"FUT8 modifies the α1,6-fucosylation of IGF-1R, and this core fucosylation regulates IGF-1-dependent activation of IGF-1R and downstream MAPK and PI3K/Akt signaling in trophoblastic cells; FUT8 knockdown suppresses trophoblast proliferation, EMT, migration, and invasion.","method":"siRNA knockdown in JAR/JEG-3 cells, immunoprecipitation of core-fucosylated IGF-1R, phospho-IGF-1R western blot, functional cell assays","journal":"Placenta","confidence":"High","confidence_rationale":"Tier 2 — Co-IP identifying specific glycoprotein substrate + defined downstream signaling, clean KD phenotype","pmids":["30712666"],"is_preprint":false},{"year":2020,"finding":"The C-terminal SH3 domain of FUT8 is essential for its enzymatic activity both in cells and in vitro; His-535 in the SH3 domain is the critical residue for activity; the SH3 domain also mediates partial trafficking of FUT8 to the cell surface; ribophorin I (RPN1), a subunit of the oligosaccharyltransferase complex, binds FUT8 in an SH3-dependent manner and stimulates FUT8 activity and core fucosylation.","method":"Truncation mutants, site-directed mutagenesis, immunofluorescence, FACS, cell-surface biotinylation, proteomics, LC-ESI-MS, RPN1 siRNA knockdown","journal":"Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1/2 — mutagenesis + multiple orthogonal localization/activity assays + binding partner identification with functional validation","pmids":["32350116"],"is_preprint":false},{"year":2020,"finding":"FUT8-mediated core fucosylation of EGFR upregulates cell-surface EGFR and corresponding downstream signaling, contributing to castration resistance in prostate cancer; castration in xenograft models induces FUT8 overexpression which is associated with increased EGFR expression.","method":"FUT8 overexpression in prostate cancer cells, comprehensive proteomics, EGFR cell-surface quantification, androgen-depleted xenograft model","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 2 — proteomics + in vitro/in vivo with defined mechanistic link, single lab","pmids":["32085441"],"is_preprint":false},{"year":2020,"finding":"FUT8 core fucosylation of EGFR promotes EGFR dimerization, EGF-EGFR complex trafficking, and AKT signaling; shRNA-mediated FUT8 knockdown reduces EGFR dimerization, slows EGF-EGFR complex trafficking, and decreases EGFR/AKT signaling, leading to reduced keratinocyte proliferation; conditional FUT8 knockout in an IL-23 psoriasis-like mouse model ameliorates disease phenotypes.","method":"shRNA knockdown, EGFR dimerization assay, EGF-EGFR trafficking assay, EGFR/AKT western blot, conditional KO mouse model","journal":"Journal of investigative dermatology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal in vitro methods + conditional KO mouse model with defined phenotype","pmids":["32888953"],"is_preprint":false},{"year":2020,"finding":"FUT8-mediated core fucosylation of EGFR in cancer-associated fibroblasts (CAFs) promotes their cancer-supporting capacity, leading to increased NSCLC cell proliferation and invasiveness in co-culture; FUT8 overexpression in CAFs promotes formation of an invasive tumor microenvironment in vivo.","method":"CAF isolation from NSCLC patients, FUT8 modulation, 3D-printed non-contact co-culture, CAF/NSCLC co-injection nude mouse model","journal":"American journal of cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro + in vivo with defined mechanistic target (EGFR CF), single lab","pmids":["32266093"],"is_preprint":false},{"year":2020,"finding":"The α-helical (N-terminal coiled-coil) and SH3 domains of FUT8 are both required for enzymatic activity; FUT8 forms a homodimer via intermolecular hydrophobic interactions through its α-helical domains; the SH3 domain is located in close proximity to the α-helical domain in an intermolecular manner, as shown by in vivo disulfide cross-linking.","method":"Domain truncation and site-directed mutagenesis, in vivo disulfide cross-linking, heterologous expression in Sf21/COS-1 cells, enzymatic activity assays","journal":"Biochimica et biophysica acta. General subjects","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis + cross-linking demonstrating homodimer and domain requirement for activity","pmids":["32147455"],"is_preprint":false},{"year":2020,"finding":"FUT8 substrate specificity requires the biantennary complex N-glycan structure; FUT8 recognizes all sugar units of the G0 N-glycan and most residues of the Asn-X-Thr sequon; prior binding of GDP-β-L-fucose (or GDP) is required for optimal N-glycan acceptor recognition; the underlying peptide/protein context influences fucosylation of high-mannose and paucimannose but not complex-type N-glycans.","method":"Crystal structures of FUT8 with donor analog and four distinct glycan acceptors, STD NMR, kinetic assays on active site mutants, glycan acceptor library screening, CHO cell glycan engineering","journal":"Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — multiple crystal structures + mutagenesis + NMR + cell-based validation; comprehensive substrate specificity study","pmids":["33004438"],"is_preprint":false},{"year":2021,"finding":"FUT8 catalyzes core fucosylation of B7H3 (CD276) at N-glycan sites, stabilizing B7H3 protein; FUT8 knockdown causes loss of B7H3 glycosylation and rescues B7H3-mediated immunosuppressive function in TNBC cells; combined FUT8 inhibition and anti-PDL1 shows enhanced therapeutic efficacy.","method":"FUT8 knockdown, glycan analysis, B7H3 protein stability assay, immune suppression functional assay, in vivo tumor model with 2F-Fuc inhibitor + anti-PDL1","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — KD with defined substrate (B7H3), protein stability mechanism, in vivo validation","pmids":["33976130"],"is_preprint":false},{"year":2021,"finding":"FUT8 overexpression in colonic cells increases delivery of MUC1 to the plasma membrane and extracellular release of MUC2 and MUC5AC; FUT8-modified mucins are more resistant to removal from the cell surface; FUT8 KD causes intracellular accumulation of MUC1 and alters the MUC2:MUC5AC ratio; Fut8-/- mice exhibit thinner proximal colon mucus with altered neutral-to-acidic mucin ratio.","method":"FUT8 overexpression and KD in HT29-18N2 cells, MUC1 cell-surface localization, mucin secretion assay, Fut8-/- mouse mucus analysis","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 — gain/loss-of-function in cells + KO mouse with defined mucin trafficking and biophysical phenotype","pmids":["36252012"],"is_preprint":false},{"year":2021,"finding":"FUT8 activity is directed by glycan structure and protein context: complex-type N-glycans are the preferred substrates in cells; peptide/protein context expands FUT8 activity to high-mannose and paucimannose N-glycans; sialylation of N-glycans significantly reduces FUT8 substrate efficiency.","method":"In vitro FUT8 assay with N-glycan library, N-glycopeptides, STD NMR, CHO cell glycan engineering (KO of specific glycosylation enzymes), mass spectrometry glycan analysis","journal":"ACS catalysis","confidence":"High","confidence_rationale":"Tier 1 — comprehensive in vitro and cell-based analysis with multiple substrate types and NMR","pmids":["35662980"],"is_preprint":false},{"year":2021,"finding":"FUT8 modifies core fucosylation levels on TNF receptors (TNFRs); lower TNFR fucosylation in osteosarcoma cells activates the non-canonical NF-κB signaling pathway and decreases mitochondria-dependent apoptosis, promoting OS cell survival.","method":"FUT8 expression analysis in OS cell lines, gain/loss-of-function, TNFR fucosylation analysis, non-canonical NF-κB pathway assay, apoptosis assay","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — defined glycoprotein substrate and downstream pathway, single lab","pmids":["34857735"],"is_preprint":false},{"year":2022,"finding":"FUT8 stem region (two α-helices) is essential for FUT8 oligomerization/multimer formation but not for catalytic activity; the first helix of the stem region is critical for multimer formation; loss of the stem region destabilizes FUT8 protein, increases ER localization, and shortens its half-life.","method":"FUT8Δstem mutants expressed in FUT8-KO HEK293 cells, immunoprecipitation, native-PAGE, ER localization analysis, protein half-life assay","journal":"Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1/2 — mutagenesis + multiple biochemical assays in clean KO background, dissects structural vs. catalytic requirements","pmids":["36336076"],"is_preprint":false},{"year":2022,"finding":"Quantitative glycoproteomics identifies 140 common core-fucosylated FUT8 target glycoproteins in invasive breast cancer cells; core fucosylation of integrin αvβ5 is crucial for breast cancer cell adhesion to vitronectin; core fucosylation of IL6ST is crucial for enhanced cellular signaling by IL-6 and oncostatin M.","method":"Quantitative glycoproteomics on FUT8-KO vs. wild-type cells, LCA blot, LC-MS/MS validation, functional adhesion assays, ingenuity pathway analysis","journal":"Breast cancer research : BCR","confidence":"High","confidence_rationale":"Tier 2 — large-scale glycoproteomics with functional validation of specific substrates, multiple orthogonal methods","pmids":["35303925"],"is_preprint":false},{"year":2022,"finding":"FUT8 interacts with galectin-3 (Gal-3) by co-immunoprecipitation; FUT8 knockdown downregulates Gal-3 expression and inhibits FAK/Akt signaling, thereby suppressing TGF-β1-induced fibroblast proliferation, migration, and fibrosis; overexpression of Gal-3 reverses the effects of FUT8 silencing.","method":"Co-IP assay, siRNA knockdown in MRC-5 cells, rescue with Gal-3 overexpression, CCK-8/BrdU/wound healing assays, western blot, bleomycin mouse model","journal":"Journal of Southern Medical University","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP binding partner + KD with rescue, single lab","pmids":["36073215"],"is_preprint":false},{"year":2023,"finding":"FUT8-silence-induced defucosylation at N104 on B7-H3 in colorectal cancer cells exposes a 106-110 SLRLQ motif recognized by HSC70 (HSPA8), which then drives lysosomal degradation of B7-H3 via the chaperone-mediated autophagy (CMA) pathway; the FUT8 inhibitor FDW028 recapitulates this mechanism.","method":"FUT8 siRNA, mass spectrometry identification of HSPA8 binding, CMA pathway assay with LAMP2A, in vivo CRC pulmonary metastasis model with FDW028","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 — defined molecular mechanism linking fucosylation site to specific degradation pathway, validated with small molecule and in vivo","pmids":["37537172"],"is_preprint":false},{"year":2023,"finding":"FUT8-catalyzed core fucosylation is required for AβO-induced pro-inflammatory microglial activation; FUT8 inhibition (siRNA or pharmacological) reduces pro-inflammatory cytokines and p38MAPK activation in AβO-stimulated hiMG; p53 binds to the Fut8 promoter and is required for FUT8 overexpression in AβO-activated microglia.","method":"Human iPSC-derived microglia model, siRNA knockdown, cytokine assays, p38MAPK western blot, p53 promoter binding analysis, p53 siRNA rescue","journal":"Glia","confidence":"Medium","confidence_rationale":"Tier 2 — defined downstream signaling + transcriptional regulation mechanism, single lab","pmids":["36692036"],"is_preprint":false},{"year":2023,"finding":"FUT8 directly catalyzes core fucosylation of SEMA7A at five N-linked glycosylation sites (Asn 105, 157, 258, 330, 602) via a direct protein-protein interaction; this glycosylation is required for SEMA7A trafficking from cytoplasm to cell membrane; EGF increases SEMA7A-FUT8 binding affinity; glycosylated SEMA7A drives CD8+ T cell exhaustion and defines RBM4 as downstream effector of PD-L1 alternative splicing.","method":"Co-IP, MS identification of glycosylation sites, trafficking/localization assay, EGF stimulation, T cell exhaustion assay, RBM4/PD-L1 functional analysis","journal":"International journal of oral science","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP + MS site mapping + functional trafficking assay, single lab","pmids":["38548747"],"is_preprint":false},{"year":2023,"finding":"FUT8-mediated core fucosylation of VEGFR-2 activates the AKT pathway in pulmonary artery smooth muscle cells; FUT8 knockdown inhibits PDGF-BB-induced PASMC proliferation, migration, phenotypic switching, and apoptosis resistance; AKT activator SC79 partially reverses siFUT8 effects.","method":"siRNA knockdown in PASMCs, AKT pathway western blot, cell proliferation/migration/apoptosis assays, monocrotaline PAH rat model with 2FF inhibitor","journal":"Aging and disease","confidence":"Medium","confidence_rationale":"Tier 2 — defined mechanistic link to VEGFR/AKT with pathway rescue, in vivo validation, single lab","pmids":["37196106"],"is_preprint":false},{"year":2023,"finding":"Loss of FUT8 in renal tubular epithelial cells ameliorates IRI-induced renal inflammation-to-fibrosis transition via the TLR3 core fucosylation-NF-κB signaling pathway; tubular epithelial cell-specific FUT8 knockout mouse demonstrates cell type-specific role.","method":"TEC-specific conditional FUT8 knockout mouse, IRI model, TLR3 core fucosylation analysis, NF-κB signaling assay","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 — conditional KO mouse + defined pathway (TLR3-NF-κB CF) + cell-type specificity established","pmids":["37432656"],"is_preprint":false},{"year":2024,"finding":"FUT8 interacts with TMEM67, a ciliary transition zone component, and catalyzes its core fucosylation; core fucosylation stabilizes TMEM67 by preventing its autophagy-mediated degradation and ensures its proper localization to the transition zone for ciliogenesis; Fut8-deficient mice exhibit ciliary defects in kidney, brain, and trachea; ectopic Cntn2 (core fucosylation target) rescues neuronal defects from Fut8 deficiency.","method":"Mass spectrometry proteomics, Co-IP of FUT8-TMEM67, core fucosylation assay, autophagy degradation assay, TMEM67 localization, Fut8 conditional KO mouse with organ-specific ciliary phenotyping","journal":"Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1/2 — MS substrate identification + Co-IP + degradation mechanism + conditional KO mouse with multiple organ phenotypes","pmids":["40728580"],"is_preprint":false},{"year":2024,"finding":"FUT8 inhibitor development: GDP binding induces a closed, catalytically competent active site via conformational rearrangement of two flexible loops; a selective small-molecule inhibitor (KD = 49 nM) binds only in the presence of GDP, generating a reactive naphthoquinone methide that covalently reacts with FUT8; prodrug derivatization enables cellular suppression of EGFR and T-cell signaling.","method":"High-throughput screening, SPR binding, mechanistic inhibitor studies, cell-based core fucose assay, EGFR/T-cell signaling assays","journal":"Angewandte Chemie","confidence":"High","confidence_rationale":"Tier 1 — mechanistic inhibitor study with defined covalent mechanism and cellular validation","pmids":["39340265"],"is_preprint":false},{"year":2025,"finding":"FUT8 catalysis proceeds via a GDP-fucose-induced concerted loop closure creating a competent active site; the reaction follows a highly asynchronous SN2 inverting mechanism involving cleavage of the fucose-GDP glycosidic bond, formation of the new glycosidic bond, and H-transfer to the catalytic Glu373 as three stages with a transient intimate ion pair (lifetime 350–800 fs); no stable oxocarbenium intermediate forms.","method":"Molecular dynamics, QM/MM simulations, metadynamics, electron localization function (ELF) topological analysis","journal":"ACS catalysis","confidence":"Medium","confidence_rationale":"Tier 1 computational — comprehensive QM/MM mechanistic study consistent with experimental kcat, but no direct experimental mutagenesis validation in same paper","pmids":["41743314"],"is_preprint":false},{"year":2011,"finding":"Increased FUT8 expression and activity in the liver are strongly linked to age-related increases in core-fucosylated N-glycans; age-related increased FUT8 activity influences IGF-1R signaling sensitivity.","method":"N-glycan profiling of mouse serum in different age groups, C57BL/6 mice including klotho-deficient and Snell Dwarf mice, caloric restriction model, FUT8 expression and activity measurement in liver","journal":"Aging cell","confidence":"Medium","confidence_rationale":"Tier 2 — defined enzymatic activity link to signaling pathway in multiple mouse models, single lab","pmids":["21951615"],"is_preprint":false},{"year":2018,"finding":"Biallelic loss-of-function mutations in human FUT8 cause a congenital disorder of glycosylation (FUT8-CDG) characterized by complete absence of FUT8 protein and substantial deficiency of core-fucosylated N-glycans in fibroblasts and serum, causing intrauterine growth retardation, developmental delays, neurological impairments, and respiratory complications.","method":"Whole-exome sequencing, functional studies in patient-derived primary fibroblasts, N-glycan analysis by mass spectrometry, splicing analysis","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — patient loss-of-function mutations + functional validation in primary cells + glycan mass spectrometry, human disease causality established","pmids":["29304374"],"is_preprint":false},{"year":2020,"finding":"FUT8 knockout in CHO cells alters not only core fucosylation but broadly changes other glycosylation processes; sialyltransferases and glucosyltransferases are sharply decreased in FUT8KO cells; 28.6% of 442 identified glycoproteins show significantly altered expression, revealing FUT8's broad impact on the glycosylation machinery.","method":"FUT8 KO CHO cells, large-scale glycoproteomics with HILIC enrichment, high-resolution LC-MS, SILAC-based proteomics","journal":"Frontiers in chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — comprehensive glycoproteomics in clean KO background, single lab","pmids":["34778211"],"is_preprint":false},{"year":2025,"finding":"FUT8 interacts with TGEV nonstructural proteins NSP3 and NSP4 (independent of its fucosyltransferase enzymatic activity) to facilitate formation of double-membrane vesicles (DMVs) required for viral replication; FUT8 enzymatic inhibitor FDW028 had no effect, confirming this role is non-enzymatic.","method":"Genome-wide CRISPR/Cas9 screen, FUT8 KO characterization, viral internalization and replication assays, DMV formation assay, Co-IP with NSP3/NSP4, FDW028 enzymatic inhibitor comparison","journal":"International journal of biological macromolecules","confidence":"Medium","confidence_rationale":"Tier 2 — CRISPR screen + Co-IP + enzymatic inhibitor comparison establishing non-enzymatic role, single lab","pmids":["41205942"],"is_preprint":false},{"year":2025,"finding":"FUT8 promotes core fucosylation of CD36 in pericytes, increasing CD36 expression and activating the mitochondrial-dependent apoptosis signaling pathway, thereby driving pericyte-to-myofibroblast transition and AKI-to-CKD progression.","method":"GEO/DISCO database analysis, IRI mouse model, hypoxia/reoxygenation pericyte model, IP/confocal-IF for CD36 CF, flow cytometry apoptosis, JC-1 mitochondrial membrane potential assay","journal":"Molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 — defined substrate (CD36) with CF assay + downstream pathway in disease model, single lab","pmids":["39563263"],"is_preprint":false},{"year":2025,"finding":"FUT8 promotes PKM2 K115 lactylation by enhancing HIF-1α-driven glycolysis and lactate production in clear cell RCC; increased PKM2 lactylation boosts PKM2 enzymatic activity while reducing its nuclear localization, driving EMT and malignant progression.","method":"FUT8 knockdown in ccRCC cells and xenografts, HIF-1α-glycolysis assay, lactylation mass spectrometry, PKM2 activity assay, nuclear/cytoplasmic fractionation","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 — defined metabolic mechanism with mass spectrometry-based PTM identification, in vitro and in vivo, single lab","pmids":["41857011"],"is_preprint":false},{"year":2025,"finding":"FUT8-mediated core fucosylation of NCEH1 stabilizes NCEH1 by preventing proteasomal degradation; core-fucosylated NCEH1 facilitates LPA secretion, driving M2-like tumor-associated macrophage polarization and promoting HGSC peritoneal metastasis.","method":"Glycoproteomic assay identifying NCEH1 as core fucosylation substrate, proteasomal degradation assay, non-targeted metabolomics for LPA, macrophage polarization assay, in vitro and in vivo metastasis models","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — glycoproteomics substrate identification + stability mechanism + functional immune cell consequence, single lab","pmids":["41786877"],"is_preprint":false},{"year":2025,"finding":"FUT8 upregulates Unc5b core fucosylation (primarily in the ER), which activates the p-CDC42/p-PAK pathway and reduces macrophage migration capacity, thereby promoting foam cell retention and atherosclerosis progression; defucosylation of Unc5b rescues macrophage migration.","method":"IP assay for Fut8-Unc5b core fucosylation, genetic deletion of fucosylation sites, ApoE-/- mouse model, Unc5b KD/overexpression, p-CDC42/p-PAK western blot, wound healing migration assay","journal":"Cell & bioscience","confidence":"Medium","confidence_rationale":"Tier 2 — IP identifying substrate + ER localization + defined downstream pathway + in vivo model, single lab","pmids":["36670464"],"is_preprint":false},{"year":2025,"finding":"FUT8 promotes core fucosylation of Toll-like receptor 4 (TLR4) in gingival fibroblasts, enhancing NF-κB signaling sensitivity and inflammatory cytokine secretion; dual-gene silencing of Fut8 and TLR4 confirms their synergistic role in the inflammatory cascade; core fucosylation inhibitor 2FF alleviates periodontitis in a mouse model.","method":"Co-immunoprecipitation, TLR4 glycosylation assay, gene silencing, NF-κB pathway analysis, cytokine assay, periodontitis mouse model with 2FF","journal":"International dental journal","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP substrate identification + pathway assay + in vivo model, single lab","pmids":["41653834"],"is_preprint":false},{"year":2025,"finding":"FUT8 depletion reduces cAMP production following FSH stimulation in granulosa cells, impairing FSHR signaling; Fut8-/- mouse oocytes exhibit abnormal zona pellucida formation and impaired embryonic development; FIGLA expression and other embryonic development genes are downregulated in Fut8-/- ovaries.","method":"FUT8 knockdown in KGN cells, cAMP assay, Fut8-/- mouse oocyte/embryo analysis, zona pellucida imaging, FIGLA expression analysis","journal":"Journal of assisted reproduction and genetics","confidence":"Medium","confidence_rationale":"Tier 2 — KD+KO with defined signaling (FSHR/cAMP) and developmental phenotype, single lab","pmids":["40473957"],"is_preprint":false},{"year":2025,"finding":"FUT8 promotes HDM-induced epithelial-mesenchymal transition and IL-25/IL-33 inflammatory responses in bronchial epithelial cells by catalyzing core fucosylation of GLUT1 at Asn45 (N45), stabilizing GLUT1 protein and enhancing glycolysis; the GLUT1 N45Q mutant abolishes this effect.","method":"Lectin pull-down assay for GLUT1-FUT8 interaction, FUT8 overexpression/silencing, GLUT1 half-life assay, N45Q mutagenesis rescue, ECAR/ATP/lactate assays, IL-25/IL-33 secretion assay","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 — site-specific mutagenesis (N45Q) + substrate stabilization assay + rescue experiment, identifies precise glycosylation site","pmids":["41027183"],"is_preprint":false}],"current_model":"FUT8 is the sole mammalian α-1,6-fucosyltransferase responsible for core fucosylation—transferring GDP-β-L-fucose to the innermost GlcNAc of N-glycans via an asynchronous SN2 inverting mechanism in the Golgi; its GT-B fold catalytic domain, N-terminal coiled-coil domain, and C-terminal SH3 domain (which binds the oligosaccharyltransferase subunit RPN1 to stimulate activity) cooperate in homodimeric assembly, while the stem region drives oligomerization and protein stability; FUT8-mediated core fucosylation modulates the function, stability, signaling, and trafficking of a wide array of glycoprotein substrates including EGFR, TGF-β receptors, IGF-1R, LRP-1, VEGFR-2, TLR4, B7H3, TMEM67, GLUT1, and mucins, thereby regulating receptor signaling cascades (MAPK, PI3K/AKT, NF-κB, TGF-β/Smad), immune checkpoint function, ciliogenesis, mucus biophysics, and erythroid differentiation."},"narrative":{"teleology":[{"year":2004,"claim":"Establishing FUT8 as the enzyme responsible for core fucosylation resolved which gene product catalyzes α-1,6-fucose addition to N-glycans and demonstrated its functional impact on antibody effector function.","evidence":"Homologous recombination knockout in CHO cells with glycan analysis and ADCC assay","pmids":["15352059"],"confidence":"High","gaps":["No structural basis for catalysis yet known","Endogenous glycoprotein substrates not identified","In vivo physiological role uncharacterized"]},{"year":2006,"claim":"Determination of the FUT8 crystal structure and kinetic mechanism revealed a three-domain architecture (coiled-coil, GT-B catalytic, SH3) and ordered donor-substrate binding, providing the first molecular framework for understanding catalysis and substrate recognition.","evidence":"X-ray crystallography at 2.6 Å resolution; recombinant enzyme kinetic analysis with substrate analogs","pmids":["17172260","16344263"],"confidence":"High","gaps":["No acceptor-bound structures available","Role of SH3 domain in catalysis unknown","Mechanism of homodimerization unresolved"]},{"year":2006,"claim":"Fut8 knockout mice revealed that core fucosylation is essential for TGF-β and EGF receptor signaling and LRP-1-mediated endocytosis in vivo, establishing FUT8 as a master regulator of receptor glycoprotein function.","evidence":"Fut8-null mouse phenotyping with growth retardation and emphysema, receptor signaling rescue experiments, LRP-1 endocytosis assay","pmids":["17132494","16567404"],"confidence":"High","gaps":["Specific glycosylation sites on receptors not mapped","Cell-type-specific contributions not dissected","Whether core fucosylation directly modifies receptor conformation or stability unresolved"]},{"year":2013,"claim":"Discovery that FUT8 differentially modulates TGF-β superfamily signaling—enhancing TGF-β but inhibiting activin signaling—and suppresses erythroid differentiation demonstrated context-dependent biological functions beyond simple receptor activation.","evidence":"siRNA knockdown and rescue in PC12 cells for activin/Smad2; gain/loss-of-function with domain mutagenesis in erythroleukemia cells","pmids":["23796784","23609441"],"confidence":"High","gaps":["Structural basis for differential receptor modulation unknown","Whether erythroid role is strictly glycosylation-dependent not fully resolved"]},{"year":2017,"claim":"Identification of FUT8 as a driver of cancer invasion through core fucosylation of TGF-β receptors (promoting EMT via a positive feedback loop) and L1CAM (promoting melanoma dissemination) expanded FUT8's role to oncogenic glycoprotein regulation.","evidence":"CRISPR KO/shRNA + lentiviral overexpression in breast cancer with xenograft; systems glycomics in melanoma with in vivo dissemination model","pmids":["28982386","28609658"],"confidence":"High","gaps":["Full catalog of cancer-relevant substrates unknown","Relative contribution of individual substrates to invasive phenotype not quantified"]},{"year":2018,"claim":"Identification of biallelic FUT8 loss-of-function mutations in humans causing FUT8-CDG established that core fucosylation is essential for normal human development, paralleling the mouse knockout phenotype.","evidence":"Whole-exome sequencing, patient fibroblast functional studies, N-glycan mass spectrometry","pmids":["29304374"],"confidence":"High","gaps":["Genotype-phenotype correlation across different mutations not established","Whether partial loss of function produces milder phenotypes unknown"]},{"year":2020,"claim":"Dissection of FUT8's domain architecture resolved how the SH3 domain (via His-535 and RPN1 binding), coiled-coil domain (via homodimerization), and stem region (via oligomerization and protein stability) cooperate to support enzymatic function and proper Golgi retention.","evidence":"Truncation and point mutagenesis, disulfide cross-linking, RPN1 co-IP and siRNA, native-PAGE, protein half-life assays in FUT8-KO cells","pmids":["32350116","32147455","36336076"],"confidence":"High","gaps":["Full-length homodimer structure not available","How RPN1 stimulation mechanistically enhances catalysis unclear","Whether SH3-mediated cell-surface trafficking has physiological relevance unknown"]},{"year":2020,"claim":"Comprehensive structural and substrate-specificity studies with multiple acceptor-bound crystal structures established that FUT8 recognizes all sugar units of biantennary N-glycans and the Asn-X-Thr sequon, with GDP-fucose binding required to create the acceptor recognition site, while sialylation inhibits substrate efficiency.","evidence":"Crystal structures with four distinct glycan acceptors, STD NMR, glycan library screening, CHO cell glycan engineering","pmids":["33004438","35662980"],"confidence":"High","gaps":["How protein context expands specificity to high-mannose glycans mechanistically unclear","No structure capturing the catalytic transition state"]},{"year":2021,"claim":"Demonstration that FUT8 core fucosylation stabilizes immune checkpoint B7H3 and modulates mucin trafficking/secretion extended the enzyme's functional reach to immune evasion and mucosal barrier maintenance.","evidence":"FUT8 KD with B7H3 stability and immune suppression assays in TNBC; FUT8 gain/loss-of-function for mucin trafficking in HT29 cells and Fut8-/- mouse colon analysis","pmids":["33976130","36252012"],"confidence":"High","gaps":["Specific glycosylation sites on mucins responsible for trafficking effects not mapped","Whether B7H3 stabilization mechanism generalizes to other checkpoint proteins unknown"]},{"year":2023,"claim":"Elucidation of the chaperone-mediated autophagy degradation pathway for defucosylated B7H3 (via HSC70 recognition of an exposed motif) provided the first mechanistic link between loss of core fucosylation and a specific protein degradation route.","evidence":"Mass spectrometry identification of HSPA8 binding, CMA/LAMP2A pathway dissection, in vivo CRC model with FUT8 inhibitor FDW028","pmids":["37537172"],"confidence":"High","gaps":["Whether CMA-mediated degradation applies to other defucosylated substrates unknown","Structural basis for motif exposure upon defucosylation not resolved"]},{"year":2024,"claim":"Discovery that FUT8 interacts with and core-fucosylates the ciliary transition zone protein TMEM67, preventing its autophagic degradation and enabling ciliogenesis, revealed a previously unrecognized role for core fucosylation in organelle biogenesis.","evidence":"Proteomics, Co-IP, autophagy degradation assay, conditional Fut8 KO mouse with kidney/brain/trachea ciliary phenotyping","pmids":["40728580"],"confidence":"High","gaps":["Whether other ciliary proteins require core fucosylation unknown","Mechanism by which fucosylation blocks autophagic recognition not defined"]},{"year":2025,"claim":"QM/MM simulations resolved the catalytic mechanism as a highly asynchronous SN2 inversion with a transient intimate ion pair (not a stable oxocarbenium intermediate), while inhibitor studies confirmed GDP-induced loop closure creates the catalytically competent active site.","evidence":"QM/MM metadynamics and ELF topological analysis; HTS-derived covalent inhibitor with SPR and cellular validation","pmids":["41743314","39340265"],"confidence":"Medium","gaps":["Computational mechanism awaits direct experimental validation by kinetic isotope effects or time-resolved crystallography","Covalent inhibitor selectivity profile across other glycosyltransferases not established"]},{"year":2025,"claim":"A non-enzymatic, scaffolding role for FUT8 was identified in viral replication, where it interacts with TGEV NSP3/NSP4 to promote double-membrane vesicle formation independently of its fucosyltransferase activity.","evidence":"CRISPR screen, Co-IP with viral NSPs, comparison of FUT8 KO vs. enzymatic inhibitor FDW028","pmids":["41205942"],"confidence":"Medium","gaps":["Whether this non-enzymatic role extends to other coronaviruses unknown","Structural basis of NSP3/NSP4 interaction undefined","Single-lab observation not yet independently confirmed"]},{"year":null,"claim":"Key unresolved questions include: the full-length homodimer structure at atomic resolution, the structural basis for how core fucosylation differentially stabilizes versus activates distinct receptor substrates, whether a unified degradation mechanism (CMA or proteasomal) applies across defucosylated glycoproteins, and the extent of non-enzymatic scaffolding functions.","evidence":"","pmids":[],"confidence":"High","gaps":["No full-length homodimer cryo-EM or crystal structure","Transition-state mechanism not validated by kinetic isotope effects","Systematic comparison of substrate-specific stabilization mechanisms lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,2,9,18,21]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[3,7,10,15]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[2,13,23]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[13]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,9,18,21,36]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,10,12,15,30]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[19,26,27]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,2,18,21]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[31,43]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[26,31]}],"complexes":["FUT8 homodimer"],"partners":["RPN1","TMEM67","EGFR","B7H3","LGALS3","TLR4","GLUT1","L1CAM"],"other_free_text":[]},"mechanistic_narrative":"FUT8 is the sole mammalian α-1,6-fucosyltransferase, catalyzing the transfer of fucose from GDP-β-L-fucose to the innermost GlcNAc of N-glycans (core fucosylation) in the Golgi, thereby broadly regulating glycoprotein stability, trafficking, and receptor signaling across diverse cellular contexts. Structurally, FUT8 functions as a homodimer assembled through its N-terminal coiled-coil domain, with a GT-B fold catalytic domain that employs an ordered binding mechanism (GDP-fucose binding preceding acceptor recognition) and a C-terminal SH3 domain whose His-535 residue is essential for activity and whose interaction with RPN1 stimulates catalytic function, while a stem region governs oligomerization and protein stability [PMID:17172260, PMID:32350116, PMID:32147455, PMID:36336076, PMID:33004438]. Core fucosylation by FUT8 modulates the function of numerous glycoprotein substrates—including EGFR, TGF-β receptors, IGF-1R, VEGFR-2, B7H3, TLR4, TMEM67, GLUT1, and mucins—affecting receptor dimerization, ligand binding, cell-surface expression, and protection from proteasomal or autophagic degradation, with downstream consequences for MAPK, PI3K/AKT, NF-κB, and TGF-β/Smad signaling, EMT, immune checkpoint regulation, ciliogenesis, and mucus barrier integrity [PMID:28982386, PMID:32888953, PMID:33976130, PMID:36252012, PMID:40728580, PMID:41027183]. Biallelic loss-of-function mutations in FUT8 cause a congenital disorder of glycosylation (FUT8-CDG) with growth retardation, neurological impairment, and respiratory complications [PMID:29304374]."},"prefetch_data":{"uniprot":{"accession":"Q9BYC5","full_name":"Alpha-(1,6)-fucosyltransferase","aliases":["Fucosyltransferase 8","GDP-L-Fuc:N-acetyl-beta-D-glucosaminide alpha1,6-fucosyltransferase","GDP-fucose--glycoprotein fucosyltransferase","Glycoprotein 6-alpha-L-fucosyltransferase"],"length_aa":575,"mass_kda":66.5,"function":"Catalyzes the addition of fucose in alpha 1-6 linkage to the first GlcNAc residue, next to the peptide chains in N-glycans (PubMed:17172260, PubMed:29304374, PubMed:36280670, PubMed:9133635). Fucosylates the reducing GlcNAc residue in complex-type N-glycans attached on the fragment crystallizable (Fc) of IgGs. Fully converts Fc glycoforms containing one or two terminal GlcNAc moieties (G0-GlcNAc and G0) (PubMed:36280670)","subcellular_location":"Golgi apparatus, Golgi stack membrane","url":"https://www.uniprot.org/uniprotkb/Q9BYC5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/FUT8","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/FUT8","total_profiled":1310},"omim":[{"mim_id":"618005","title":"CONGENITAL DISORDER OF GLYCOSYLATION WITH DEFECTIVE FUCOSYLATION 1; CDGF1","url":"https://www.omim.org/entry/618005"},{"mim_id":"602589","title":"FUCOSYLTRANSFERASE 8; FUT8","url":"https://www.omim.org/entry/602589"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Golgi apparatus","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/FUT8"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q9BYC5","domains":[{"cath_id":"1.10.287.1060","chopping":"111-174","consensus_level":"high","plddt":97.7145,"start":111,"end":174},{"cath_id":"-","chopping":"185-315","consensus_level":"high","plddt":97.8408,"start":185,"end":315},{"cath_id":"3.40.50.11350","chopping":"338-491","consensus_level":"high","plddt":95.3438,"start":338,"end":491},{"cath_id":"2.30.30.40","chopping":"505-564","consensus_level":"high","plddt":98.3245,"start":505,"end":564}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BYC5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BYC5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BYC5-F1-predicted_aligned_error_v6.png","plddt_mean":92.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=FUT8","jax_strain_url":"https://www.jax.org/strain/search?query=FUT8"},"sequence":{"accession":"Q9BYC5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9BYC5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9BYC5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BYC5"}},"corpus_meta":[{"pmid":"15352059","id":"PMC_15352059","title":"Establishment of FUT8 knockout Chinese hamster ovary cells: an ideal host cell line for producing completely defucosylated antibodies with enhanced antibody-dependent cellular cytotoxicity.","date":"2004","source":"Biotechnology and bioengineering","url":"https://pubmed.ncbi.nlm.nih.gov/15352059","citation_count":428,"is_preprint":false},{"pmid":"28609658","id":"PMC_28609658","title":"A Systems Biology Approach Identifies FUT8 as a Driver of Melanoma Metastasis.","date":"2017","source":"Cancer cell","url":"https://pubmed.ncbi.nlm.nih.gov/28609658","citation_count":247,"is_preprint":false},{"pmid":"28982386","id":"PMC_28982386","title":"FUT8 promotes breast cancer cell invasiveness by remodeling TGF-β receptor core fucosylation.","date":"2017","source":"Breast cancer research : BCR","url":"https://pubmed.ncbi.nlm.nih.gov/28982386","citation_count":177,"is_preprint":false},{"pmid":"33976130","id":"PMC_33976130","title":"FUT8-mediated aberrant N-glycosylation of B7H3 suppresses the immune response in triple-negative breast cancer.","date":"2021","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/33976130","citation_count":151,"is_preprint":false},{"pmid":"15515168","id":"PMC_15515168","title":"Engineering Chinese hamster ovary cells to maximize effector function of produced antibodies using FUT8 siRNA.","date":"2004","source":"Biotechnology and bioengineering","url":"https://pubmed.ncbi.nlm.nih.gov/15515168","citation_count":122,"is_preprint":false},{"pmid":"17172260","id":"PMC_17172260","title":"Crystal structure of mammalian alpha1,6-fucosyltransferase, FUT8.","date":"2006","source":"Glycobiology","url":"https://pubmed.ncbi.nlm.nih.gov/17172260","citation_count":117,"is_preprint":false},{"pmid":"18047682","id":"PMC_18047682","title":"Double knockdown of alpha1,6-fucosyltransferase (FUT8) and GDP-mannose 4,6-dehydratase (GMD) in antibody-producing cells: a new strategy for generating fully non-fucosylated therapeutic antibodies with enhanced ADCC.","date":"2007","source":"BMC biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/18047682","citation_count":114,"is_preprint":false},{"pmid":"20564614","id":"PMC_20564614","title":"Highly efficient deletion of FUT8 in CHO cell lines using zinc-finger nucleases yields cells that produce completely nonfucosylated antibodies.","date":"2010","source":"Biotechnology and bioengineering","url":"https://pubmed.ncbi.nlm.nih.gov/20564614","citation_count":112,"is_preprint":false},{"pmid":"14568171","id":"PMC_14568171","title":"Expression of alpha1,6-fucosyltransferase (FUT8) in papillary carcinoma of the thyroid: its linkage to biological aggressiveness and anaplastic transformation.","date":"2003","source":"Cancer letters","url":"https://pubmed.ncbi.nlm.nih.gov/14568171","citation_count":82,"is_preprint":false},{"pmid":"17132494","id":"PMC_17132494","title":"Phenotype changes of Fut8 knockout mouse: core fucosylation is crucial for the function of growth factor 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N-Glycans.","date":"2016","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/27008861","citation_count":54,"is_preprint":false},{"pmid":"32266093","id":"PMC_32266093","title":"α1,6-Fucosyltransferase (FUT8) regulates the cancer-promoting capacity of cancer-associated fibroblasts (CAFs) by modifying EGFR core fucosylation (CF) in non-small cell lung cancer (NSCLC).","date":"2020","source":"American journal of cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/32266093","citation_count":47,"is_preprint":false},{"pmid":"37537172","id":"PMC_37537172","title":"FDW028, a novel FUT8 inhibitor, impels lysosomal proteolysis of B7-H3 via chaperone-mediated autophagy pathway and exhibits potent efficacy against metastatic colorectal cancer.","date":"2023","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/37537172","citation_count":45,"is_preprint":false},{"pmid":"35662980","id":"PMC_35662980","title":"FUT8-Directed Core Fucosylation of 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analysis, FcγRIIIa binding assay, ADCC assay\",\n      \"journal\": \"Biotechnology and bioengineering\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — enzymatic activity defined by KO with multiple orthogonal functional readouts, widely replicated\",\n      \"pmids\": [\"15352059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Crystal structure of human FUT8 at 2.6 Å resolution reveals three domains: an N-terminal coiled-coil (α-helical) domain, a GT-B fold catalytic domain with a Rossmann fold housing the GDP-fucose donor binding site, and a C-terminal SH3 domain; conserved residues in the Rossmann fold participate in donor substrate binding and catalysis.\",\n      \"method\": \"X-ray crystallography at 2.6 Å resolution\",\n      \"journal\": \"Glycobiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with functional domain annotation, foundational structural paper\",\n      \"pmids\": [\"17172260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"FUT8 is a type II Golgi-localized membrane protein that follows a rapid equilibrium random kinetic mechanism; it strongly recognizes the base portion and diphosphoryl group of GDP-β-L-fucose as donor substrate; two conserved arginine residues play an important role in donor substrate binding.\",\n      \"method\": \"Large-scale recombinant protein production in baculovirus/insect cells, kinetic analysis, inhibition studies with GDP-fucose derivatives\",\n      \"journal\": \"Glycobiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro enzymatic characterization with substrate analogs and mutagenesis-informed kinetic analysis\",\n      \"pmids\": [\"16344263\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Core fucosylation by Fut8 is required for normal TGF-β1 receptor and EGF receptor signaling; Fut8-null mice show severe growth retardation and emphysema-like lung destruction due to dysregulated TGF-β1 receptor activation, overexpression of MMP12/MMP13, and downregulation of elastin; reintroduction of Fut8 rescues receptor-mediated signaling in null cells.\",\n      \"method\": \"Fut8 knockout mouse phenotyping, TGF-β1 therapeutic rescue experiment, gene reintroduction rescue in null cells\",\n      \"journal\": \"Methods in enzymology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with defined molecular phenotype, multiple receptors tested, rescue experiment performed\",\n      \"pmids\": [\"17132494\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Core fucosylation by Fut8 is required for normal LRP-1 scavenger/endocytic function; loss of Fut8 impairs LRP-1-mediated endocytosis of IGFBP-3, leading to markedly elevated serum IGFBP-3 in Fut8-null mice; reintroduction of Fut8 rescues endocytosis.\",\n      \"method\": \"Fut8 knockout mouse model, endocytosis assay, serum IGFBP-3 measurement, Fut8 gene reintroduction rescue\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO with defined molecular phenotype and rescue, replicated in vivo and in vitro\",\n      \"pmids\": [\"16567404\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Fut8 is required for normal VEGFR-2 expression in the lung; knockdown of Fut8 suppresses VEGFR-2 mRNA and protein at the transcriptional level; loss of VEGFR-2 increases ceramide and apoptosis of septal epithelia and endothelia, contributing to emphysema-like changes in Fut8-/- mice.\",\n      \"method\": \"Fut8 KO mouse lung analysis, siRNA knockdown in A549/TGP49 cells, VEGFR-2 mRNA/protein quantification, TUNEL assay\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse + siRNA with defined mechanistic pathway and apoptotic readout\",\n      \"pmids\": [\"19179362\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Donor substrate GDP-fucose binding to FUT8 involves specific recognition of the guanine base by His363 and Asp453, tight binding of the pyrophosphate moiety, and simultaneous binding of Arg365 to both the β-phosphate and the fucose moiety; prior binding of GDP is required for optimal N-glycan acceptor recognition.\",\n      \"method\": \"STD NMR, SPR binding assays, in silico molecular docking and MD simulations based on structural analogy to cePOFUT\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1/2 — STD NMR and SPR experimental validation of binding interactions, single lab\",\n      \"pmids\": [\"22982178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"α1,6-Fucosylation of activin receptors by Fut8 negatively regulates activin-mediated signaling (phospho-Smad2); knockdown of Fut8 in PC12 cells decreases α1,6-fucosylation of activin receptors and enhances activin-induced phospho-Smad2 and neurite formation, while restoring Fut8 reverses this; demonstrating a dual role for Fut8 in TGF-β versus activin signaling.\",\n      \"method\": \"siRNA knockdown in PC12 cells, phospho-Smad2 immunoblot, neurite formation assay, activin receptor lectin analysis, Fut8 re-expression rescue\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KD with defined molecular pathway + rescue, multiple orthogonal readouts\",\n      \"pmids\": [\"23796784\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"FUT8 overexpression inhibits hemoglobin production and erythroid differentiation; the donor substrate-binding domain and a flexible loop are essential for this inhibitory function; FUT8 expression is positively regulated by c-Myc and c-Myb during erythroid differentiation.\",\n      \"method\": \"Gene expression profiling, overexpression and shRNA knockdown in murine erythroleukemia and K562 cells, domain mutagenesis, hemoglobin assay, transferrin receptor/glycophorin A FACS\",\n      \"journal\": \"Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — gain/loss-of-function with domain mutagenesis pinpointing functional regions, multiple cell lines\",\n      \"pmids\": [\"23609441\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Mammalian FUT8 is the sole enzyme responsible for GnT I-independent core fucosylation of high-mannose N-glycans (Man5GlcNAc2); knockdown of FUT8 in GnT I-/- HEK293S cells eliminates core fucosylation of high-mannose glycoforms, while FUT8 overexpression produces fully core-fucosylated oligomannose glycans.\",\n      \"method\": \"Lentivirus-mediated FUT8 knockdown and overexpression in HEK293S GnT I-/- cells, glycan analysis of recombinant EPO\",\n      \"journal\": \"Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic gain/loss-of-function in defined cell background, direct glycan readout\",\n      \"pmids\": [\"27008861\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"FUT8 mediates core fucosylation of TGF-β receptor complexes, enhancing TGF-β1 binding and downstream signaling to promote EMT and breast cancer invasion; FUT8 is transcriptionally upregulated during TGF-β-induced EMT, creating a positive feedback loop.\",\n      \"method\": \"shRNA/CRISPR KO and lentiviral overexpression, lectin blot, luciferase signaling assay, in vitro ligand binding assay, transwell invasion, mammary fat pad xenograft\",\n      \"journal\": \"Breast cancer research : BCR\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — gain/loss-of-function with multiple orthogonal methods including in vivo model\",\n      \"pmids\": [\"28982386\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"FUT8 silencing suppresses melanoma invasion and tumor dissemination; L1CAM is identified as a glycoprotein target of FUT8 core fucosylation, and core fucosylation of L1CAM impacts its cleavage and ability to support melanoma invasion.\",\n      \"method\": \"Systems-based glycomics of patient samples, siRNA silencing, in vitro invasion assays, in vivo tumor dissemination model, glycoprotein target enrichment\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — patient-derived systems data + in vitro/in vivo KD with identified glycoprotein substrate\",\n      \"pmids\": [\"28609658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"FUT8 modifies the α1,6-fucosylation of IGF-1R, and this core fucosylation regulates IGF-1-dependent activation of IGF-1R and downstream MAPK and PI3K/Akt signaling in trophoblastic cells; FUT8 knockdown suppresses trophoblast proliferation, EMT, migration, and invasion.\",\n      \"method\": \"siRNA knockdown in JAR/JEG-3 cells, immunoprecipitation of core-fucosylated IGF-1R, phospho-IGF-1R western blot, functional cell assays\",\n      \"journal\": \"Placenta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP identifying specific glycoprotein substrate + defined downstream signaling, clean KD phenotype\",\n      \"pmids\": [\"30712666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The C-terminal SH3 domain of FUT8 is essential for its enzymatic activity both in cells and in vitro; His-535 in the SH3 domain is the critical residue for activity; the SH3 domain also mediates partial trafficking of FUT8 to the cell surface; ribophorin I (RPN1), a subunit of the oligosaccharyltransferase complex, binds FUT8 in an SH3-dependent manner and stimulates FUT8 activity and core fucosylation.\",\n      \"method\": \"Truncation mutants, site-directed mutagenesis, immunofluorescence, FACS, cell-surface biotinylation, proteomics, LC-ESI-MS, RPN1 siRNA knockdown\",\n      \"journal\": \"Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — mutagenesis + multiple orthogonal localization/activity assays + binding partner identification with functional validation\",\n      \"pmids\": [\"32350116\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FUT8-mediated core fucosylation of EGFR upregulates cell-surface EGFR and corresponding downstream signaling, contributing to castration resistance in prostate cancer; castration in xenograft models induces FUT8 overexpression which is associated with increased EGFR expression.\",\n      \"method\": \"FUT8 overexpression in prostate cancer cells, comprehensive proteomics, EGFR cell-surface quantification, androgen-depleted xenograft model\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — proteomics + in vitro/in vivo with defined mechanistic link, single lab\",\n      \"pmids\": [\"32085441\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FUT8 core fucosylation of EGFR promotes EGFR dimerization, EGF-EGFR complex trafficking, and AKT signaling; shRNA-mediated FUT8 knockdown reduces EGFR dimerization, slows EGF-EGFR complex trafficking, and decreases EGFR/AKT signaling, leading to reduced keratinocyte proliferation; conditional FUT8 knockout in an IL-23 psoriasis-like mouse model ameliorates disease phenotypes.\",\n      \"method\": \"shRNA knockdown, EGFR dimerization assay, EGF-EGFR trafficking assay, EGFR/AKT western blot, conditional KO mouse model\",\n      \"journal\": \"Journal of investigative dermatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal in vitro methods + conditional KO mouse model with defined phenotype\",\n      \"pmids\": [\"32888953\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FUT8-mediated core fucosylation of EGFR in cancer-associated fibroblasts (CAFs) promotes their cancer-supporting capacity, leading to increased NSCLC cell proliferation and invasiveness in co-culture; FUT8 overexpression in CAFs promotes formation of an invasive tumor microenvironment in vivo.\",\n      \"method\": \"CAF isolation from NSCLC patients, FUT8 modulation, 3D-printed non-contact co-culture, CAF/NSCLC co-injection nude mouse model\",\n      \"journal\": \"American journal of cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro + in vivo with defined mechanistic target (EGFR CF), single lab\",\n      \"pmids\": [\"32266093\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The α-helical (N-terminal coiled-coil) and SH3 domains of FUT8 are both required for enzymatic activity; FUT8 forms a homodimer via intermolecular hydrophobic interactions through its α-helical domains; the SH3 domain is located in close proximity to the α-helical domain in an intermolecular manner, as shown by in vivo disulfide cross-linking.\",\n      \"method\": \"Domain truncation and site-directed mutagenesis, in vivo disulfide cross-linking, heterologous expression in Sf21/COS-1 cells, enzymatic activity assays\",\n      \"journal\": \"Biochimica et biophysica acta. General subjects\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis + cross-linking demonstrating homodimer and domain requirement for activity\",\n      \"pmids\": [\"32147455\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FUT8 substrate specificity requires the biantennary complex N-glycan structure; FUT8 recognizes all sugar units of the G0 N-glycan and most residues of the Asn-X-Thr sequon; prior binding of GDP-β-L-fucose (or GDP) is required for optimal N-glycan acceptor recognition; the underlying peptide/protein context influences fucosylation of high-mannose and paucimannose but not complex-type N-glycans.\",\n      \"method\": \"Crystal structures of FUT8 with donor analog and four distinct glycan acceptors, STD NMR, kinetic assays on active site mutants, glycan acceptor library screening, CHO cell glycan engineering\",\n      \"journal\": \"Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple crystal structures + mutagenesis + NMR + cell-based validation; comprehensive substrate specificity study\",\n      \"pmids\": [\"33004438\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FUT8 catalyzes core fucosylation of B7H3 (CD276) at N-glycan sites, stabilizing B7H3 protein; FUT8 knockdown causes loss of B7H3 glycosylation and rescues B7H3-mediated immunosuppressive function in TNBC cells; combined FUT8 inhibition and anti-PDL1 shows enhanced therapeutic efficacy.\",\n      \"method\": \"FUT8 knockdown, glycan analysis, B7H3 protein stability assay, immune suppression functional assay, in vivo tumor model with 2F-Fuc inhibitor + anti-PDL1\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KD with defined substrate (B7H3), protein stability mechanism, in vivo validation\",\n      \"pmids\": [\"33976130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FUT8 overexpression in colonic cells increases delivery of MUC1 to the plasma membrane and extracellular release of MUC2 and MUC5AC; FUT8-modified mucins are more resistant to removal from the cell surface; FUT8 KD causes intracellular accumulation of MUC1 and alters the MUC2:MUC5AC ratio; Fut8-/- mice exhibit thinner proximal colon mucus with altered neutral-to-acidic mucin ratio.\",\n      \"method\": \"FUT8 overexpression and KD in HT29-18N2 cells, MUC1 cell-surface localization, mucin secretion assay, Fut8-/- mouse mucus analysis\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — gain/loss-of-function in cells + KO mouse with defined mucin trafficking and biophysical phenotype\",\n      \"pmids\": [\"36252012\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FUT8 activity is directed by glycan structure and protein context: complex-type N-glycans are the preferred substrates in cells; peptide/protein context expands FUT8 activity to high-mannose and paucimannose N-glycans; sialylation of N-glycans significantly reduces FUT8 substrate efficiency.\",\n      \"method\": \"In vitro FUT8 assay with N-glycan library, N-glycopeptides, STD NMR, CHO cell glycan engineering (KO of specific glycosylation enzymes), mass spectrometry glycan analysis\",\n      \"journal\": \"ACS catalysis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — comprehensive in vitro and cell-based analysis with multiple substrate types and NMR\",\n      \"pmids\": [\"35662980\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FUT8 modifies core fucosylation levels on TNF receptors (TNFRs); lower TNFR fucosylation in osteosarcoma cells activates the non-canonical NF-κB signaling pathway and decreases mitochondria-dependent apoptosis, promoting OS cell survival.\",\n      \"method\": \"FUT8 expression analysis in OS cell lines, gain/loss-of-function, TNFR fucosylation analysis, non-canonical NF-κB pathway assay, apoptosis assay\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined glycoprotein substrate and downstream pathway, single lab\",\n      \"pmids\": [\"34857735\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FUT8 stem region (two α-helices) is essential for FUT8 oligomerization/multimer formation but not for catalytic activity; the first helix of the stem region is critical for multimer formation; loss of the stem region destabilizes FUT8 protein, increases ER localization, and shortens its half-life.\",\n      \"method\": \"FUT8Δstem mutants expressed in FUT8-KO HEK293 cells, immunoprecipitation, native-PAGE, ER localization analysis, protein half-life assay\",\n      \"journal\": \"Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — mutagenesis + multiple biochemical assays in clean KO background, dissects structural vs. catalytic requirements\",\n      \"pmids\": [\"36336076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Quantitative glycoproteomics identifies 140 common core-fucosylated FUT8 target glycoproteins in invasive breast cancer cells; core fucosylation of integrin αvβ5 is crucial for breast cancer cell adhesion to vitronectin; core fucosylation of IL6ST is crucial for enhanced cellular signaling by IL-6 and oncostatin M.\",\n      \"method\": \"Quantitative glycoproteomics on FUT8-KO vs. wild-type cells, LCA blot, LC-MS/MS validation, functional adhesion assays, ingenuity pathway analysis\",\n      \"journal\": \"Breast cancer research : BCR\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — large-scale glycoproteomics with functional validation of specific substrates, multiple orthogonal methods\",\n      \"pmids\": [\"35303925\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FUT8 interacts with galectin-3 (Gal-3) by co-immunoprecipitation; FUT8 knockdown downregulates Gal-3 expression and inhibits FAK/Akt signaling, thereby suppressing TGF-β1-induced fibroblast proliferation, migration, and fibrosis; overexpression of Gal-3 reverses the effects of FUT8 silencing.\",\n      \"method\": \"Co-IP assay, siRNA knockdown in MRC-5 cells, rescue with Gal-3 overexpression, CCK-8/BrdU/wound healing assays, western blot, bleomycin mouse model\",\n      \"journal\": \"Journal of Southern Medical University\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP binding partner + KD with rescue, single lab\",\n      \"pmids\": [\"36073215\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"FUT8-silence-induced defucosylation at N104 on B7-H3 in colorectal cancer cells exposes a 106-110 SLRLQ motif recognized by HSC70 (HSPA8), which then drives lysosomal degradation of B7-H3 via the chaperone-mediated autophagy (CMA) pathway; the FUT8 inhibitor FDW028 recapitulates this mechanism.\",\n      \"method\": \"FUT8 siRNA, mass spectrometry identification of HSPA8 binding, CMA pathway assay with LAMP2A, in vivo CRC pulmonary metastasis model with FDW028\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — defined molecular mechanism linking fucosylation site to specific degradation pathway, validated with small molecule and in vivo\",\n      \"pmids\": [\"37537172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"FUT8-catalyzed core fucosylation is required for AβO-induced pro-inflammatory microglial activation; FUT8 inhibition (siRNA or pharmacological) reduces pro-inflammatory cytokines and p38MAPK activation in AβO-stimulated hiMG; p53 binds to the Fut8 promoter and is required for FUT8 overexpression in AβO-activated microglia.\",\n      \"method\": \"Human iPSC-derived microglia model, siRNA knockdown, cytokine assays, p38MAPK western blot, p53 promoter binding analysis, p53 siRNA rescue\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined downstream signaling + transcriptional regulation mechanism, single lab\",\n      \"pmids\": [\"36692036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"FUT8 directly catalyzes core fucosylation of SEMA7A at five N-linked glycosylation sites (Asn 105, 157, 258, 330, 602) via a direct protein-protein interaction; this glycosylation is required for SEMA7A trafficking from cytoplasm to cell membrane; EGF increases SEMA7A-FUT8 binding affinity; glycosylated SEMA7A drives CD8+ T cell exhaustion and defines RBM4 as downstream effector of PD-L1 alternative splicing.\",\n      \"method\": \"Co-IP, MS identification of glycosylation sites, trafficking/localization assay, EGF stimulation, T cell exhaustion assay, RBM4/PD-L1 functional analysis\",\n      \"journal\": \"International journal of oral science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP + MS site mapping + functional trafficking assay, single lab\",\n      \"pmids\": [\"38548747\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"FUT8-mediated core fucosylation of VEGFR-2 activates the AKT pathway in pulmonary artery smooth muscle cells; FUT8 knockdown inhibits PDGF-BB-induced PASMC proliferation, migration, phenotypic switching, and apoptosis resistance; AKT activator SC79 partially reverses siFUT8 effects.\",\n      \"method\": \"siRNA knockdown in PASMCs, AKT pathway western blot, cell proliferation/migration/apoptosis assays, monocrotaline PAH rat model with 2FF inhibitor\",\n      \"journal\": \"Aging and disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined mechanistic link to VEGFR/AKT with pathway rescue, in vivo validation, single lab\",\n      \"pmids\": [\"37196106\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Loss of FUT8 in renal tubular epithelial cells ameliorates IRI-induced renal inflammation-to-fibrosis transition via the TLR3 core fucosylation-NF-κB signaling pathway; tubular epithelial cell-specific FUT8 knockout mouse demonstrates cell type-specific role.\",\n      \"method\": \"TEC-specific conditional FUT8 knockout mouse, IRI model, TLR3 core fucosylation analysis, NF-κB signaling assay\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO mouse + defined pathway (TLR3-NF-κB CF) + cell-type specificity established\",\n      \"pmids\": [\"37432656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"FUT8 interacts with TMEM67, a ciliary transition zone component, and catalyzes its core fucosylation; core fucosylation stabilizes TMEM67 by preventing its autophagy-mediated degradation and ensures its proper localization to the transition zone for ciliogenesis; Fut8-deficient mice exhibit ciliary defects in kidney, brain, and trachea; ectopic Cntn2 (core fucosylation target) rescues neuronal defects from Fut8 deficiency.\",\n      \"method\": \"Mass spectrometry proteomics, Co-IP of FUT8-TMEM67, core fucosylation assay, autophagy degradation assay, TMEM67 localization, Fut8 conditional KO mouse with organ-specific ciliary phenotyping\",\n      \"journal\": \"Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — MS substrate identification + Co-IP + degradation mechanism + conditional KO mouse with multiple organ phenotypes\",\n      \"pmids\": [\"40728580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"FUT8 inhibitor development: GDP binding induces a closed, catalytically competent active site via conformational rearrangement of two flexible loops; a selective small-molecule inhibitor (KD = 49 nM) binds only in the presence of GDP, generating a reactive naphthoquinone methide that covalently reacts with FUT8; prodrug derivatization enables cellular suppression of EGFR and T-cell signaling.\",\n      \"method\": \"High-throughput screening, SPR binding, mechanistic inhibitor studies, cell-based core fucose assay, EGFR/T-cell signaling assays\",\n      \"journal\": \"Angewandte Chemie\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mechanistic inhibitor study with defined covalent mechanism and cellular validation\",\n      \"pmids\": [\"39340265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"FUT8 catalysis proceeds via a GDP-fucose-induced concerted loop closure creating a competent active site; the reaction follows a highly asynchronous SN2 inverting mechanism involving cleavage of the fucose-GDP glycosidic bond, formation of the new glycosidic bond, and H-transfer to the catalytic Glu373 as three stages with a transient intimate ion pair (lifetime 350–800 fs); no stable oxocarbenium intermediate forms.\",\n      \"method\": \"Molecular dynamics, QM/MM simulations, metadynamics, electron localization function (ELF) topological analysis\",\n      \"journal\": \"ACS catalysis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 computational — comprehensive QM/MM mechanistic study consistent with experimental kcat, but no direct experimental mutagenesis validation in same paper\",\n      \"pmids\": [\"41743314\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Increased FUT8 expression and activity in the liver are strongly linked to age-related increases in core-fucosylated N-glycans; age-related increased FUT8 activity influences IGF-1R signaling sensitivity.\",\n      \"method\": \"N-glycan profiling of mouse serum in different age groups, C57BL/6 mice including klotho-deficient and Snell Dwarf mice, caloric restriction model, FUT8 expression and activity measurement in liver\",\n      \"journal\": \"Aging cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined enzymatic activity link to signaling pathway in multiple mouse models, single lab\",\n      \"pmids\": [\"21951615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Biallelic loss-of-function mutations in human FUT8 cause a congenital disorder of glycosylation (FUT8-CDG) characterized by complete absence of FUT8 protein and substantial deficiency of core-fucosylated N-glycans in fibroblasts and serum, causing intrauterine growth retardation, developmental delays, neurological impairments, and respiratory complications.\",\n      \"method\": \"Whole-exome sequencing, functional studies in patient-derived primary fibroblasts, N-glycan analysis by mass spectrometry, splicing analysis\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — patient loss-of-function mutations + functional validation in primary cells + glycan mass spectrometry, human disease causality established\",\n      \"pmids\": [\"29304374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FUT8 knockout in CHO cells alters not only core fucosylation but broadly changes other glycosylation processes; sialyltransferases and glucosyltransferases are sharply decreased in FUT8KO cells; 28.6% of 442 identified glycoproteins show significantly altered expression, revealing FUT8's broad impact on the glycosylation machinery.\",\n      \"method\": \"FUT8 KO CHO cells, large-scale glycoproteomics with HILIC enrichment, high-resolution LC-MS, SILAC-based proteomics\",\n      \"journal\": \"Frontiers in chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — comprehensive glycoproteomics in clean KO background, single lab\",\n      \"pmids\": [\"34778211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"FUT8 interacts with TGEV nonstructural proteins NSP3 and NSP4 (independent of its fucosyltransferase enzymatic activity) to facilitate formation of double-membrane vesicles (DMVs) required for viral replication; FUT8 enzymatic inhibitor FDW028 had no effect, confirming this role is non-enzymatic.\",\n      \"method\": \"Genome-wide CRISPR/Cas9 screen, FUT8 KO characterization, viral internalization and replication assays, DMV formation assay, Co-IP with NSP3/NSP4, FDW028 enzymatic inhibitor comparison\",\n      \"journal\": \"International journal of biological macromolecules\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR screen + Co-IP + enzymatic inhibitor comparison establishing non-enzymatic role, single lab\",\n      \"pmids\": [\"41205942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"FUT8 promotes core fucosylation of CD36 in pericytes, increasing CD36 expression and activating the mitochondrial-dependent apoptosis signaling pathway, thereby driving pericyte-to-myofibroblast transition and AKI-to-CKD progression.\",\n      \"method\": \"GEO/DISCO database analysis, IRI mouse model, hypoxia/reoxygenation pericyte model, IP/confocal-IF for CD36 CF, flow cytometry apoptosis, JC-1 mitochondrial membrane potential assay\",\n      \"journal\": \"Molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined substrate (CD36) with CF assay + downstream pathway in disease model, single lab\",\n      \"pmids\": [\"39563263\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"FUT8 promotes PKM2 K115 lactylation by enhancing HIF-1α-driven glycolysis and lactate production in clear cell RCC; increased PKM2 lactylation boosts PKM2 enzymatic activity while reducing its nuclear localization, driving EMT and malignant progression.\",\n      \"method\": \"FUT8 knockdown in ccRCC cells and xenografts, HIF-1α-glycolysis assay, lactylation mass spectrometry, PKM2 activity assay, nuclear/cytoplasmic fractionation\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined metabolic mechanism with mass spectrometry-based PTM identification, in vitro and in vivo, single lab\",\n      \"pmids\": [\"41857011\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"FUT8-mediated core fucosylation of NCEH1 stabilizes NCEH1 by preventing proteasomal degradation; core-fucosylated NCEH1 facilitates LPA secretion, driving M2-like tumor-associated macrophage polarization and promoting HGSC peritoneal metastasis.\",\n      \"method\": \"Glycoproteomic assay identifying NCEH1 as core fucosylation substrate, proteasomal degradation assay, non-targeted metabolomics for LPA, macrophage polarization assay, in vitro and in vivo metastasis models\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — glycoproteomics substrate identification + stability mechanism + functional immune cell consequence, single lab\",\n      \"pmids\": [\"41786877\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"FUT8 upregulates Unc5b core fucosylation (primarily in the ER), which activates the p-CDC42/p-PAK pathway and reduces macrophage migration capacity, thereby promoting foam cell retention and atherosclerosis progression; defucosylation of Unc5b rescues macrophage migration.\",\n      \"method\": \"IP assay for Fut8-Unc5b core fucosylation, genetic deletion of fucosylation sites, ApoE-/- mouse model, Unc5b KD/overexpression, p-CDC42/p-PAK western blot, wound healing migration assay\",\n      \"journal\": \"Cell & bioscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — IP identifying substrate + ER localization + defined downstream pathway + in vivo model, single lab\",\n      \"pmids\": [\"36670464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"FUT8 promotes core fucosylation of Toll-like receptor 4 (TLR4) in gingival fibroblasts, enhancing NF-κB signaling sensitivity and inflammatory cytokine secretion; dual-gene silencing of Fut8 and TLR4 confirms their synergistic role in the inflammatory cascade; core fucosylation inhibitor 2FF alleviates periodontitis in a mouse model.\",\n      \"method\": \"Co-immunoprecipitation, TLR4 glycosylation assay, gene silencing, NF-κB pathway analysis, cytokine assay, periodontitis mouse model with 2FF\",\n      \"journal\": \"International dental journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP substrate identification + pathway assay + in vivo model, single lab\",\n      \"pmids\": [\"41653834\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"FUT8 depletion reduces cAMP production following FSH stimulation in granulosa cells, impairing FSHR signaling; Fut8-/- mouse oocytes exhibit abnormal zona pellucida formation and impaired embryonic development; FIGLA expression and other embryonic development genes are downregulated in Fut8-/- ovaries.\",\n      \"method\": \"FUT8 knockdown in KGN cells, cAMP assay, Fut8-/- mouse oocyte/embryo analysis, zona pellucida imaging, FIGLA expression analysis\",\n      \"journal\": \"Journal of assisted reproduction and genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD+KO with defined signaling (FSHR/cAMP) and developmental phenotype, single lab\",\n      \"pmids\": [\"40473957\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"FUT8 promotes HDM-induced epithelial-mesenchymal transition and IL-25/IL-33 inflammatory responses in bronchial epithelial cells by catalyzing core fucosylation of GLUT1 at Asn45 (N45), stabilizing GLUT1 protein and enhancing glycolysis; the GLUT1 N45Q mutant abolishes this effect.\",\n      \"method\": \"Lectin pull-down assay for GLUT1-FUT8 interaction, FUT8 overexpression/silencing, GLUT1 half-life assay, N45Q mutagenesis rescue, ECAR/ATP/lactate assays, IL-25/IL-33 secretion assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — site-specific mutagenesis (N45Q) + substrate stabilization assay + rescue experiment, identifies precise glycosylation site\",\n      \"pmids\": [\"41027183\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FUT8 is the sole mammalian α-1,6-fucosyltransferase responsible for core fucosylation—transferring GDP-β-L-fucose to the innermost GlcNAc of N-glycans via an asynchronous SN2 inverting mechanism in the Golgi; its GT-B fold catalytic domain, N-terminal coiled-coil domain, and C-terminal SH3 domain (which binds the oligosaccharyltransferase subunit RPN1 to stimulate activity) cooperate in homodimeric assembly, while the stem region drives oligomerization and protein stability; FUT8-mediated core fucosylation modulates the function, stability, signaling, and trafficking of a wide array of glycoprotein substrates including EGFR, TGF-β receptors, IGF-1R, LRP-1, VEGFR-2, TLR4, B7H3, TMEM67, GLUT1, and mucins, thereby regulating receptor signaling cascades (MAPK, PI3K/AKT, NF-κB, TGF-β/Smad), immune checkpoint function, ciliogenesis, mucus biophysics, and erythroid differentiation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"FUT8 is the sole mammalian α-1,6-fucosyltransferase, catalyzing the transfer of fucose from GDP-β-L-fucose to the innermost GlcNAc of N-glycans (core fucosylation) in the Golgi, thereby broadly regulating glycoprotein stability, trafficking, and receptor signaling across diverse cellular contexts. Structurally, FUT8 functions as a homodimer assembled through its N-terminal coiled-coil domain, with a GT-B fold catalytic domain that employs an ordered binding mechanism (GDP-fucose binding preceding acceptor recognition) and a C-terminal SH3 domain whose His-535 residue is essential for activity and whose interaction with RPN1 stimulates catalytic function, while a stem region governs oligomerization and protein stability [PMID:17172260, PMID:32350116, PMID:32147455, PMID:36336076, PMID:33004438]. Core fucosylation by FUT8 modulates the function of numerous glycoprotein substrates—including EGFR, TGF-β receptors, IGF-1R, VEGFR-2, B7H3, TLR4, TMEM67, GLUT1, and mucins—affecting receptor dimerization, ligand binding, cell-surface expression, and protection from proteasomal or autophagic degradation, with downstream consequences for MAPK, PI3K/AKT, NF-κB, and TGF-β/Smad signaling, EMT, immune checkpoint regulation, ciliogenesis, and mucus barrier integrity [PMID:28982386, PMID:32888953, PMID:33976130, PMID:36252012, PMID:40728580, PMID:41027183]. Biallelic loss-of-function mutations in FUT8 cause a congenital disorder of glycosylation (FUT8-CDG) with growth retardation, neurological impairment, and respiratory complications [PMID:29304374].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Establishing FUT8 as the enzyme responsible for core fucosylation resolved which gene product catalyzes α-1,6-fucose addition to N-glycans and demonstrated its functional impact on antibody effector function.\",\n      \"evidence\": \"Homologous recombination knockout in CHO cells with glycan analysis and ADCC assay\",\n      \"pmids\": [\"15352059\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural basis for catalysis yet known\", \"Endogenous glycoprotein substrates not identified\", \"In vivo physiological role uncharacterized\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Determination of the FUT8 crystal structure and kinetic mechanism revealed a three-domain architecture (coiled-coil, GT-B catalytic, SH3) and ordered donor-substrate binding, providing the first molecular framework for understanding catalysis and substrate recognition.\",\n      \"evidence\": \"X-ray crystallography at 2.6 Å resolution; recombinant enzyme kinetic analysis with substrate analogs\",\n      \"pmids\": [\"17172260\", \"16344263\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No acceptor-bound structures available\", \"Role of SH3 domain in catalysis unknown\", \"Mechanism of homodimerization unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Fut8 knockout mice revealed that core fucosylation is essential for TGF-β and EGF receptor signaling and LRP-1-mediated endocytosis in vivo, establishing FUT8 as a master regulator of receptor glycoprotein function.\",\n      \"evidence\": \"Fut8-null mouse phenotyping with growth retardation and emphysema, receptor signaling rescue experiments, LRP-1 endocytosis assay\",\n      \"pmids\": [\"17132494\", \"16567404\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific glycosylation sites on receptors not mapped\", \"Cell-type-specific contributions not dissected\", \"Whether core fucosylation directly modifies receptor conformation or stability unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Discovery that FUT8 differentially modulates TGF-β superfamily signaling—enhancing TGF-β but inhibiting activin signaling—and suppresses erythroid differentiation demonstrated context-dependent biological functions beyond simple receptor activation.\",\n      \"evidence\": \"siRNA knockdown and rescue in PC12 cells for activin/Smad2; gain/loss-of-function with domain mutagenesis in erythroleukemia cells\",\n      \"pmids\": [\"23796784\", \"23609441\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for differential receptor modulation unknown\", \"Whether erythroid role is strictly glycosylation-dependent not fully resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identification of FUT8 as a driver of cancer invasion through core fucosylation of TGF-β receptors (promoting EMT via a positive feedback loop) and L1CAM (promoting melanoma dissemination) expanded FUT8's role to oncogenic glycoprotein regulation.\",\n      \"evidence\": \"CRISPR KO/shRNA + lentiviral overexpression in breast cancer with xenograft; systems glycomics in melanoma with in vivo dissemination model\",\n      \"pmids\": [\"28982386\", \"28609658\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full catalog of cancer-relevant substrates unknown\", \"Relative contribution of individual substrates to invasive phenotype not quantified\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identification of biallelic FUT8 loss-of-function mutations in humans causing FUT8-CDG established that core fucosylation is essential for normal human development, paralleling the mouse knockout phenotype.\",\n      \"evidence\": \"Whole-exome sequencing, patient fibroblast functional studies, N-glycan mass spectrometry\",\n      \"pmids\": [\"29304374\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genotype-phenotype correlation across different mutations not established\", \"Whether partial loss of function produces milder phenotypes unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Dissection of FUT8's domain architecture resolved how the SH3 domain (via His-535 and RPN1 binding), coiled-coil domain (via homodimerization), and stem region (via oligomerization and protein stability) cooperate to support enzymatic function and proper Golgi retention.\",\n      \"evidence\": \"Truncation and point mutagenesis, disulfide cross-linking, RPN1 co-IP and siRNA, native-PAGE, protein half-life assays in FUT8-KO cells\",\n      \"pmids\": [\"32350116\", \"32147455\", \"36336076\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length homodimer structure not available\", \"How RPN1 stimulation mechanistically enhances catalysis unclear\", \"Whether SH3-mediated cell-surface trafficking has physiological relevance unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Comprehensive structural and substrate-specificity studies with multiple acceptor-bound crystal structures established that FUT8 recognizes all sugar units of biantennary N-glycans and the Asn-X-Thr sequon, with GDP-fucose binding required to create the acceptor recognition site, while sialylation inhibits substrate efficiency.\",\n      \"evidence\": \"Crystal structures with four distinct glycan acceptors, STD NMR, glycan library screening, CHO cell glycan engineering\",\n      \"pmids\": [\"33004438\", \"35662980\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How protein context expands specificity to high-mannose glycans mechanistically unclear\", \"No structure capturing the catalytic transition state\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstration that FUT8 core fucosylation stabilizes immune checkpoint B7H3 and modulates mucin trafficking/secretion extended the enzyme's functional reach to immune evasion and mucosal barrier maintenance.\",\n      \"evidence\": \"FUT8 KD with B7H3 stability and immune suppression assays in TNBC; FUT8 gain/loss-of-function for mucin trafficking in HT29 cells and Fut8-/- mouse colon analysis\",\n      \"pmids\": [\"33976130\", \"36252012\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific glycosylation sites on mucins responsible for trafficking effects not mapped\", \"Whether B7H3 stabilization mechanism generalizes to other checkpoint proteins unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Elucidation of the chaperone-mediated autophagy degradation pathway for defucosylated B7H3 (via HSC70 recognition of an exposed motif) provided the first mechanistic link between loss of core fucosylation and a specific protein degradation route.\",\n      \"evidence\": \"Mass spectrometry identification of HSPA8 binding, CMA/LAMP2A pathway dissection, in vivo CRC model with FUT8 inhibitor FDW028\",\n      \"pmids\": [\"37537172\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CMA-mediated degradation applies to other defucosylated substrates unknown\", \"Structural basis for motif exposure upon defucosylation not resolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Discovery that FUT8 interacts with and core-fucosylates the ciliary transition zone protein TMEM67, preventing its autophagic degradation and enabling ciliogenesis, revealed a previously unrecognized role for core fucosylation in organelle biogenesis.\",\n      \"evidence\": \"Proteomics, Co-IP, autophagy degradation assay, conditional Fut8 KO mouse with kidney/brain/trachea ciliary phenotyping\",\n      \"pmids\": [\"40728580\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other ciliary proteins require core fucosylation unknown\", \"Mechanism by which fucosylation blocks autophagic recognition not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"QM/MM simulations resolved the catalytic mechanism as a highly asynchronous SN2 inversion with a transient intimate ion pair (not a stable oxocarbenium intermediate), while inhibitor studies confirmed GDP-induced loop closure creates the catalytically competent active site.\",\n      \"evidence\": \"QM/MM metadynamics and ELF topological analysis; HTS-derived covalent inhibitor with SPR and cellular validation\",\n      \"pmids\": [\"41743314\", \"39340265\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Computational mechanism awaits direct experimental validation by kinetic isotope effects or time-resolved crystallography\", \"Covalent inhibitor selectivity profile across other glycosyltransferases not established\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"A non-enzymatic, scaffolding role for FUT8 was identified in viral replication, where it interacts with TGEV NSP3/NSP4 to promote double-membrane vesicle formation independently of its fucosyltransferase activity.\",\n      \"evidence\": \"CRISPR screen, Co-IP with viral NSPs, comparison of FUT8 KO vs. enzymatic inhibitor FDW028\",\n      \"pmids\": [\"41205942\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether this non-enzymatic role extends to other coronaviruses unknown\", \"Structural basis of NSP3/NSP4 interaction undefined\", \"Single-lab observation not yet independently confirmed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the full-length homodimer structure at atomic resolution, the structural basis for how core fucosylation differentially stabilizes versus activates distinct receptor substrates, whether a unified degradation mechanism (CMA or proteasomal) applies across defucosylated glycoproteins, and the extent of non-enzymatic scaffolding functions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No full-length homodimer cryo-EM or crystal structure\", \"Transition-state mechanism not validated by kinetic isotope effects\", \"Systematic comparison of substrate-specific stabilization mechanisms lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 2, 9, 18, 21]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 7, 10, 15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [2, 13, 23]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 9, 18, 21, 36]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 10, 12, 15, 30]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [19, 26, 27]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 2, 18, 21]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [31, 43]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [26, 31]}\n    ],\n    \"complexes\": [\n      \"FUT8 homodimer\"\n    ],\n    \"partners\": [\n      \"RPN1\",\n      \"TMEM67\",\n      \"EGFR\",\n      \"B7H3\",\n      \"LGALS3\",\n      \"TLR4\",\n      \"GLUT1\",\n      \"L1CAM\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}