{"gene":"DUT","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":1992,"finding":"Crystal structure of E. coli dUTPase determined at 1.9 Å resolution, revealing the enzyme is a symmetrical homotrimer with a jelly-roll fold lacking the classical nucleotide-binding domain; conserved sequence elements are located at subunit interfaces, suggesting inter-subunit interactions contribute to catalysis.","method":"X-ray crystallography","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — atomic resolution crystal structure with functional interpretation; foundational structural study replicated and extended by multiple subsequent structural papers","pmids":["1311056"],"is_preprint":false},{"year":1996,"finding":"Crystal structure of E. coli dUTPase in complex with substrate analogue dUDP at atomic resolution shows three dUDP molecules bound symmetrically per trimer in shallow clefts between adjacent subunits, with conserved residues contacting the uracil ring and deoxypentose; positions of phosphate groups and adjacent water molecules inform the catalytic mechanism.","method":"X-ray crystallography with bound inhibitor/substrate analogue","journal":"Nature structural biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution enzyme-ligand co-crystal structure; mechanistic detail independently validated by kinetic studies","pmids":["8646539"],"is_preprint":false},{"year":1996,"finding":"Kinetic characterization of E. coli dUTPase showed: strict specificity for dUTP (dCTP hydrolyzed ~10^5 times less efficiently); kcat 6–9 s⁻¹; Km ~10⁻⁷ M near neutral pH; Mg²⁺ enhances dUTP binding ~100-fold; only one enantiomer of a thio-dUTP analogue is hydrolyzed; protons released concertedly after the rate-limiting step; proposed mechanism involves Mg²⁺ binding at α-phosphate with rate-limiting hydrolysis by a shielded water molecule.","method":"Steady-state and pre-steady-state enzymology, pH-rate studies, isotope effects, substrate stereochemistry","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — comprehensive in vitro kinetic analysis with multiple orthogonal methods in a single detailed study","pmids":["8798636"],"is_preprint":false},{"year":1997,"finding":"Human DUT gene encodes both nuclear (DUT-N) and mitochondrial (DUT-M) isoforms via alternative 5' exon usage from the same gene. DUT-M contains a 69-residue mitochondrial targeting presequence that is cleaved upon import, producing a 23 kDa mature protein. DUT-N is cell-cycle-regulated (elevated during DNA replication), whereas DUT-M is constitutively expressed.","method":"cDNA cloning, in vitro transcription/translation, mitochondrial import assay, Northern/Western blot, isoelectric focusing, genomic DNA sequencing","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (import assay, enzymatic activity, IEF, genomic sequencing) establishing both isoform origin and localization mechanism","pmids":["9228092"],"is_preprint":false},{"year":2004,"finding":"Crystal structure of Mycobacterium tuberculosis dUTPase at 1.3 Å in complex with Mg²⁺ and non-hydrolyzable substrate analogue α,β-imido-dUTP reveals that Mg²⁺ coordinates α-, β-, and γ-phosphate groups in tridentate geometry, stabilising the α-phosphorus for in-line nucleophilic attack; a transiently ordered C-terminal loop shields the general-base Asp83 from solvent, raising its pKa to activate a water molecule for nucleophilic attack.","method":"X-ray crystallography with Mg²⁺ and substrate analogue","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — 1.3 Å resolution enzyme-substrate analogue-metal co-crystal structure providing detailed mechanistic insight","pmids":["15276840"],"is_preprint":false},{"year":2007,"finding":"Pre-steady-state and steady-state kinetics of human dUTPase (using an engineered tryptophan fluorescence sensor in the active site) revealed the catalytic cycle consists of four steps: (i) fast substrate binding, (ii) isomerization to catalytically competent conformation, (iii) rate-limiting hydrolysis (chemical step), and (iv) rapid non-ordered product release. Proton release is concomitant with the rate-limiting hydrolysis step.","method":"Pre-steady-state kinetics (stopped-flow fluorescence), quenched-flow with γ-³²P-dUTP, indicator-based rapid kinetic assays, site-directed mutagenesis (Trp sensor)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal kinetic methods in one rigorous study, with engineered fluorescent sensor and mutagenesis","pmids":["17848562"],"is_preprint":false},{"year":2013,"finding":"Phosphorylation of human nuclear dUTPase at Ser11 (adjacent to its NLS) occurs specifically during M phase of the cell cycle, mediated by cell-cycle kinase activity, and abolishes nuclear import by significantly weakening interaction with importin-α. Crystal structures of importin-α bound to wild-type and phosphomimetic (S11E) dUTPase NLS peptides provide structural explanation for this regulation.","method":"X-ray crystallography, isothermal titration calorimetry, cell biological localization studies with phosphomimetic/phosphoablative mutants, NLS-importin-α binding assays","journal":"Acta crystallographica Section D","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — crystal structures plus binding thermodynamics plus cell biological validation, multiple orthogonal methods in one study","pmids":["24311590"],"is_preprint":false},{"year":2003,"finding":"The N-terminal 23 amino acids of human DUT-N are required (but not sufficient) for nuclear localization; a cluster of basic residues K14R15R17 constitutes a functional nuclear localization signal whose mutation completely abolishes nuclear import. Ser11 phosphorylation (noted in this paper) does not affect DUT-N nuclear localization in the GFP-fusion system used here.","method":"GFP fusion constructs, deletion analysis, site-directed mutagenesis, fluorescence microscopy","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean mutagenesis with GFP reporter in cell culture, single lab but multiple mutants tested","pmids":["12799180"],"is_preprint":false},{"year":2017,"finding":"CRISPR/Cas9 knock-out of dUTPase in mice is embryonic lethal: dut⁻/⁻ embryos reach the blastocyst stage but die shortly after implantation, with perturbed growth of both inner cell mass and trophectoderm; heterozygous dut⁺/⁻ animals are viable with reduced dUTPase levels.","method":"CRISPR/Cas9 gene editing in mice, embryo analysis, blastocyst staging","journal":"Biomolecules","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean mammalian knock-out model with defined embryonic lethal phenotype; directly establishes essentiality of DUT in mammalian development","pmids":["30987342"],"is_preprint":false},{"year":2017,"finding":"DUT mutation (p.Y54C in DUT-N / p.Y142C in DUT-M) identified as the cause of a monogenic syndrome with early-onset diabetes and bone marrow failure. DUT silencing in human and rat pancreatic β-cells causes apoptosis via the intrinsic cell death pathway, demonstrating that DUT is required for β-cell survival.","method":"Whole-exome sequencing (patient genetics), siRNA knockdown in pancreatic β-cells, apoptosis assays","journal":"Diabetes","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — human genetics corroborated by functional cell-based knockdown with defined apoptotic readout, single lab","pmids":["28073829"],"is_preprint":false},{"year":1993,"finding":"Human dUTPase (nuclear isoform) is phosphorylated in a cell-cycle-dependent manner in mature T cells; phosphorylated and unphosphorylated forms accumulate in a proliferation-dependent manner, whereas immature thymocytes constitutively express both forms independent of cell cycle.","method":"2D PAGE, cDNA cloning from partial protein sequence, Western blot","journal":"Proceedings of the National Academy of Sciences","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct detection of phosphoprotein by 2D gel with cell-cycle correlation; single lab, no writer/eraser identified","pmids":["8389461"],"is_preprint":false},{"year":2004,"finding":"siRNA-mediated suppression of dUTPase in human cancer cell lines SW620 and MCF-7 significantly expands dUTP pools following thymidylate synthase inhibition, enhances DNA double-strand break formation, and decreases FUdR IC₅₀ ~75-fold and ~6-fold respectively, demonstrating that dUTPase controls cellular dUTP levels and protects cells from uracil-misincorporation-induced DNA damage.","method":"siRNA knockdown, nucleotide pool measurements, clonogenic survival assay, DNA damage assays (DSBs)","journal":"Molecular pharmacology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean siRNA knockdown with multiple orthogonal biochemical and cellular readouts, replicated across cell lines","pmids":["15322254"],"is_preprint":false},{"year":2004,"finding":"dUTPase activity loss in S. cerevisiae (dut1-1 mutant with G82S substitution near active site) causes growth delay, cell cycle abnormalities, and a strong spontaneous mutator phenotype. All phenotypes are suppressed by inactivation of uracil-DNA glycosylase (Ung1), establishing that dUTPase phenotypes arise from dUMP incorporation into DNA followed by uracil excision creating AP sites.","method":"Yeast genetics (viable dut1-1 allele), double-mutant epistasis (dut1-1 ung1), mutation spectrum analysis, cell cycle analysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with multiple suppressor combinations and mutation spectrum analysis clearly defines pathway position","pmids":["16617146"],"is_preprint":false},{"year":2004,"finding":"E. coli dut recA double mutants are synthetically lethal, and chromosomal fragmentation (double-strand DNA breaks) is detected in dut rec mutants. The synthetic lethality and fragmentation are suppressed by inactivating uracil-DNA glycosylase (ung) or dCTP deaminase (dcd), showing dUTPase loss causes DSBs via a uracil-excision intermediate requiring RecBC-RuvABC recombinational repair for viability.","method":"Genetic epistasis (synthetic lethality screen), pulsed-field gel electrophoresis to detect DSBs, multiple suppressor combinations","journal":"Molecular microbiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with multiple suppressor combinations and direct DSB detection","pmids":["14982624"],"is_preprint":false},{"year":2010,"finding":"A conserved aromatic stacking interaction between dUTPase and the uracil moiety of its substrate contributes to stabilisation of an associative-type transition state during α-phosphate hydrolysis; the π-π interaction remote from the hydrolysis site accelerates catalysis. Crystallographic, kinetic, spectroscopic, and thermodynamic data support this mechanism.","method":"X-ray crystallography, enzyme kinetics, optical spectroscopy, thermodynamics calculations, site-directed mutagenesis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — multi-method study combining structure, mutagenesis, and kinetics in one rigorous report","pmids":["20601405"],"is_preprint":false},{"year":2009,"finding":"C-terminal β-strand swapping between subunits is critical for dUTPase homotrimer organisation; truncation of the C-terminus before the swapping arm prevents trimer formation in human dUTPase. Mutations of a conserved hinge proline destabilise human and E. coli dUTPases without preventing trimeric organisation.","method":"X-ray crystallography (Drosophila dUTPase dimer crystal), small-angle X-ray scattering, site-directed mutagenesis, C-terminal truncations","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — crystal structure plus SAXS plus mutagenesis establish structural basis of oligomerisation","pmids":["19302784"],"is_preprint":false},{"year":2016,"finding":"Overexpression of ribonucleotide reductase subunit R2 in non-tumorigenic cells causes genome instability (replication fork alterations, elevated genomic uracil, fragile-site breaks) that is fully abolished by dUTPase overexpression, demonstrating that dUTPase activity directly controls dUTP-driven genome instability downstream of RNR.","method":"Stable R2 overexpression, dUTPase overexpression, replication fork assays, genomic uracil measurement, fragile-site analysis","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional epistasis by overexpression with multiple cellular readouts; single lab","pmids":["27452458"],"is_preprint":false},{"year":2013,"finding":"HSV-1 protein kinase Us3 phosphorylates viral dUTPase (vdUTPase) at Ser187 in infected cells; this phosphorylation is required for optimal dUTPase enzymatic activity and promotes HSV-1 replication in neuronal (SK-N-SH) but not Vero/HEp-2 cells. Phosphomimetic substitution at Ser187 rescues both enzymatic activity and viral replication defects caused by kinase-dead Us3.","method":"Large-scale phosphoproteomics (TiO₂/MS), in vitro kinase assay, phosphate-affinity PAGE, site-directed mutagenesis (S187A phosphomimetic), viral replication assays","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (MS identification, in vitro kinase assay, phospho-PAGE, mutagenesis with rescue) in one study","pmids":["24173231"],"is_preprint":false},{"year":1988,"finding":"Chromosomal dut null mutations are lethal in E. coli even in the presence of compensatory metabolic mutations (dcd, cdd, ung, deoA, sulA, alone or combined), suggesting dUTPase has an essential function beyond its nucleotide pool-cleansing role.","method":"Allelic exchange, generalized transduction, genetic complementation in multiple mutant backgrounds","journal":"Journal of bacteriology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple genetic backgrounds tested; lethality well established but the 'additional essential function' was not further mechanistically defined in this paper","pmids":["2830228"],"is_preprint":false},{"year":2018,"finding":"The Staphylococcal repressor Stl forms a stable complex with human dUTPase trimers, inhibiting dUTPase enzymatic activity; active-site-forming segments of dUTPase are directly involved in the Stl interaction (identified by HDX-MS). Complex formation dissociates the Stl homodimer, abolishing Stl's DNA-binding ability.","method":"SAXS, hydrogen-deuterium exchange mass spectrometry (HDX-MS), functional enzymatic assays, DNA-binding assays","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — SAXS structural model plus HDX-MS site identification plus functional assays; single lab","pmids":["29531348"],"is_preprint":false},{"year":2004,"finding":"Eukaryotic (Drosophila) dUTPase, unlike the bacterial enzyme, shows Mg²⁺-dependent conformational changes, and product dUMP induces protection against proteolysis (closed active-site conformation); the C-terminal arm is critical for activity; a stable but inactive homotrimeric core domain is generated by limited trypsinolysis. Crystallographic analysis reveals a stable monomer in the crystal phase (distinct from trimeric bacterial enzyme).","method":"X-ray crystallography, kinetic analysis, limited proteolysis, fluorescence spectroscopy, differential scanning calorimetry","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with kinetic and spectroscopic studies; multiple orthogonal methods revealing mechanistic differences from prokaryotic dUTPase","pmids":["14724274"],"is_preprint":false},{"year":2017,"finding":"In a mycobacterial model encoding both Dut (monofunctional dUTPase) and Dcd:dut (bifunctional dCTP deaminase/dUTPase), Dut specifically prevents DNA uracilation (dut mutant increases genomic uracil and mutation rate) without affecting dTTP/dCTP balance, while Dcd:dut controls dNTP balance without affecting DNA uracil content. The two enzyme activities are functionally decoupled.","method":"Genetic knock-out/knock-down in Mycobacterium smegmatis, genomic uracil measurement, dNTP pool analysis, mutation rate assays","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic separation of two enzyme activities with biochemical readouts; mechanistically definitive","pmids":["28729658"],"is_preprint":false},{"year":2004,"finding":"Drosophila dUTPase is expressed as two isoforms during development (identified at mRNA and protein levels); expression decreases drastically at the protein level during larval stages despite constitutive mRNA levels, indicating multilevel regulation; macromolecular protein partners of dUTPase were verified by independent approaches, and a putative nuclear localization signal is present in one isoform, though subcellular localisation is not strictly determined by the NLS alone.","method":"Western blot, Northern blot, immunohistochemistry, co-purification approaches for interacting partners","journal":"The Journal of biological chemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — interacting partners verified but not identified; NLS present but localisation ambiguous; single lab, limited mechanistic detail","pmids":["14996835"],"is_preprint":false}],"current_model":"Human DUT encodes nuclear (DUT-N) and mitochondrial (DUT-M) isoforms from the same gene via alternative 5' exon usage; both are homotrimeric enzymes that hydrolyze dUTP to dUMP and pyrophosphate via a Mg²⁺-assisted, rate-limiting in-line nucleophilic attack on the α-phosphate facilitated by an active-site general base, aromatic stacking of the uracil moiety, and a C-terminal arm that closes over the active site; DUT-N nuclear import is regulated by cell-cycle-dependent phosphorylation at Ser11 (M-phase) which weakens importin-α binding and excludes dUTPase from the nucleus; the enzyme is essential for mammalian embryonic development (dut⁻/⁻ mice die post-implantation) and for pancreatic β-cell survival, functioning to prevent uracil misincorporation into DNA by maintaining low cellular dUTP pools and providing dUMP substrate for thymidylate biosynthesis."},"narrative":{"mechanistic_narrative":"DUT encodes dUTPase, an essential nucleotide-metabolic enzyme that hydrolyzes dUTP to dUMP and pyrophosphate, simultaneously cleansing the cellular dUTP pool to block uracil misincorporation into DNA and supplying dUMP for thymidylate biosynthesis [PMID:15322254, PMID:16617146]. The enzyme is a symmetrical homotrimer built on a jelly-roll fold lacking the classical nucleotide-binding domain, with active sites formed at the interfaces between adjacent subunits and a C-terminal arm that swaps between subunits to organize the trimer and closes over the active site during catalysis [PMID:1311056, PMID:8646539, PMID:19302784, PMID:14724274]. Catalysis proceeds through Mg²⁺-assisted, in-line nucleophilic attack on the α-phosphate by a water molecule activated by an active-site general base whose pKa is raised by a transiently ordered C-terminal loop, with aromatic stacking of the uracil ring stabilizing the transition state; the multistep cycle (binding, isomerization, rate-limiting hydrolysis, product release) releases protons concomitant with the chemical step [PMID:8798636, PMID:15276840, PMID:17848562, PMID:20601405]. Human DUT produces a nuclear isoform (DUT-N) and a mitochondrial isoform (DUT-M) via alternative 5' exon usage, the latter carrying a cleavable targeting presequence; DUT-N nuclear import depends on a basic NLS (K14/R15/R17) and is controlled by cell-cycle-dependent phosphorylation at Ser11, which during M phase weakens importin-α binding and excludes the enzyme from the nucleus [PMID:9228092, PMID:24311590, PMID:12799180, PMID:8389461]. The downstream importance of this pool control is established genetically: dUTPase loss elevates genomic uracil and, through uracil-DNA glycosylase-mediated excision, generates AP sites and double-strand breaks that demand recombinational repair, while restoring dUTPase activity abolishes dUTP-driven genome instability [PMID:16617146, PMID:14982624, PMID:27452458]. DUT is essential for mammalian embryonic development (dut⁻/⁻ mice die after implantation) and for pancreatic β-cell survival, and a DUT point mutation causes a monogenic syndrome of early-onset diabetes and bone marrow failure [PMID:30987342, PMID:28073829].","teleology":[{"year":1992,"claim":"Established the architecture of dUTPase, showing it is a symmetrical homotrimer with a jelly-roll fold and inter-subunit active sites rather than a conventional nucleotide-binding enzyme.","evidence":"1.9 Å X-ray crystal structure of E. coli dUTPase","pmids":["1311056"],"confidence":"High","gaps":["No bound substrate/metal to define catalytic geometry","Eukaryotic enzyme architecture not yet addressed"]},{"year":1996,"claim":"Defined how substrate is recognized and how the catalytic chemistry works, locating the uracil/deoxyribose contacts and assigning Mg²⁺ and a shielded water to rate-limiting α-phosphate hydrolysis.","evidence":"Co-crystal with dUDP plus comprehensive steady-state and pre-steady-state kinetics of E. coli enzyme","pmids":["8646539","8798636"],"confidence":"High","gaps":["General base not yet identified by residue","Conformational dynamics during the cycle not resolved"]},{"year":1997,"claim":"Resolved how a single gene serves two compartments, showing alternative 5' exon usage generates a cell-cycle-regulated nuclear isoform and a constitutive mitochondrial isoform with a cleavable presequence.","evidence":"cDNA cloning, mitochondrial import assay, IEF, genomic sequencing of human DUT","pmids":["9228092"],"confidence":"High","gaps":["Functional requirement for the mitochondrial pool not tested","Import/regulatory machinery not identified"]},{"year":2004,"claim":"Provided the atomic mechanism of catalysis and revealed eukaryote-specific conformational behavior, defining Mg²⁺ tridentate coordination, a general-base aspartate shielded by an ordered C-terminal loop, and product-induced active-site closure.","evidence":"1.3 Å M. tuberculosis structure with Mg²⁺ and imido-dUTP; Drosophila crystallography with proteolysis/calorimetry; yeast and E. coli epistasis defining the uracil-excision pathway","pmids":["15276840","14724274","16617146","14982624"],"confidence":"High","gaps":["Human-specific transition-state details not yet shown","Quantitative contribution of C-terminal arm dynamics unresolved"]},{"year":2004,"claim":"Demonstrated the cellular consequence of pool control, showing dUTPase suppression expands dUTP pools, causes uracil-misincorporation DSBs, and sensitizes cancer cells to thymidylate synthase-directed therapy.","evidence":"siRNA knockdown in SW620/MCF-7 with nucleotide pool, DSB, and clonogenic/FUdR sensitivity readouts","pmids":["15322254"],"confidence":"High","gaps":["Did not separate nuclear vs mitochondrial isoform contributions","In vivo therapeutic relevance not tested"]},{"year":2007,"claim":"Dissected the human catalytic cycle into discrete kinetic steps, identifying isomerization to a competent conformation and a rate-limiting chemical step coupled to proton release.","evidence":"Pre-steady-state stopped-flow/quenched-flow with an engineered active-site tryptophan sensor in human dUTPase","pmids":["17848562"],"confidence":"High","gaps":["Structural state of the isomerized intermediate not captured","Regulation of cycle in cellular context unaddressed"]},{"year":2009,"claim":"Explained the structural basis of oligomerization, showing C-terminal β-strand swapping between subunits is required for trimer assembly and that a hinge proline stabilizes the fold.","evidence":"Drosophila crystal structure, SAXS, C-terminal truncations and hinge-proline mutagenesis across species","pmids":["19302784"],"confidence":"High","gaps":["Functional consequence of monomerization in cells not tested"]},{"year":2010,"claim":"Identified a remote catalytic enhancer, showing π-π stacking on the uracil ring stabilizes an associative transition state and accelerates α-phosphate hydrolysis.","evidence":"Combined crystallography, kinetics, spectroscopy, thermodynamics and mutagenesis","pmids":["20601405"],"confidence":"High","gaps":["Magnitude of contribution across orthologs not generalized"]},{"year":2013,"claim":"Defined the regulatory logic of nuclear access, showing M-phase phosphorylation at Ser11 weakens importin-α binding to exclude dUTPase from the nucleus, integrating localization with the cell cycle.","evidence":"Importin-α/NLS-peptide crystal structures, ITC, and localization of phosphomimetic/phosphoablative mutants; earlier 2D-PAGE showing cell-cycle-dependent phosphorylation in T cells; prior GFP-mapping of the K14R15R17 NLS","pmids":["24311590","8389461","12799180"],"confidence":"High","gaps":["Identity of the M-phase kinase not established","The 2003 GFP system did not detect a phospho-effect, leaving context dependence unresolved"]},{"year":2016,"claim":"Placed dUTPase as a direct buffer of replication-stress-driven instability, showing its activity abolishes the genome instability caused by ribonucleotide reductase R2 overexpression.","evidence":"R2 and dUTPase overexpression with replication-fork, genomic uracil, and fragile-site assays","pmids":["27452458"],"confidence":"Medium","gaps":["Overexpression-based epistasis only","Endogenous-level relevance not established"]},{"year":2017,"claim":"Established mammalian essentiality and disease relevance, showing DUT loss is embryonic lethal, is required for β-cell survival, and that a point mutation causes a diabetes/bone-marrow-failure syndrome; parallel mycobacterial work decoupled DNA-uracilation prevention from dNTP-balance control.","evidence":"CRISPR dut⁻/⁻ mouse embryos; whole-exome sequencing plus β-cell siRNA/apoptosis assays; genetic separation of Dut vs Dcd:dut in M. smegmatis","pmids":["30987342","28073829","28729658"],"confidence":"Medium","gaps":["Mechanism linking DUT loss to β-cell-specific apoptosis not fully defined","Whether embryonic lethality reflects pool cleansing vs an additional function unresolved"]},{"year":2018,"claim":"Characterized a protein-level inhibitory interaction, showing the staphylococcal repressor Stl binds human dUTPase via its active-site-forming segments, inhibiting the enzyme and dissociating the Stl DNA-binding dimer.","evidence":"SAXS, HDX-MS, enzymatic and DNA-binding assays of the human dUTPase–Stl complex","pmids":["29531348"],"confidence":"Medium","gaps":["Physiological relevance of the interaction to host biology unclear","High-resolution structure of the complex not determined"]},{"year":null,"claim":"The nature of the essential function beyond dUTP-pool cleansing, implied by lethality persisting in metabolically compensated backgrounds, remains undefined.","evidence":"Open question raised by E. coli dut lethality in dcd/cdd/ung/deoA/sulA backgrounds and unresolved post-implantation lethality in mice","pmids":[],"confidence":"Medium","gaps":["No molecular identity for a 'moonlighting' essential function","Distinct roles of nuclear vs mitochondrial isoforms in vivo not separated","M-phase kinase for Ser11 not identified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[2,4,5,11]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[2,5,14]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3,6,7]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[2,11,21]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[12,13,16]}],"complexes":["dUTPase homotrimer"],"partners":["KPNA2","STL"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P33316","full_name":"Deoxyuridine 5'-triphosphate nucleotidohydrolase, mitochondrial","aliases":["dUTP pyrophosphatase"],"length_aa":252,"mass_kda":26.6,"function":"Catalyzes the cleavage of 2'-deoxyuridine 5'-triphosphate (dUTP) into 2'-deoxyuridine 5'-monophosphate (dUMP) and inorganic pyrophosphate and through its action efficiently prevents uracil misincorporation into DNA and at the same time provides dUMP, the substrate for de novo thymidylate biosynthesis (PubMed:17880943, PubMed:8631816, PubMed:8805593). Inhibits peroxisome proliferator-activated receptor (PPAR) activity by binding of its N-terminal to PPAR, preventing the latter's dimerization with retinoid X receptor (By similarity). Essential for embryonic development (By similarity)","subcellular_location":"Mitochondrion","url":"https://www.uniprot.org/uniprotkb/P33316/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/DUT","classification":"Common Essential","n_dependent_lines":1202,"n_total_lines":1208,"dependency_fraction":0.9950331125827815},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DUT","total_profiled":1310},"omim":[{"mim_id":"620044","title":"BONE MARROW FAILURE AND DIABETES MELLITUS SYNDROME; BMFDMS","url":"https://www.omim.org/entry/620044"},{"mim_id":"601266","title":"dUTP PYROPHOSPHATASE; DUT","url":"https://www.omim.org/entry/601266"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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Section D, Biological crystallography","url":"https://pubmed.ncbi.nlm.nih.gov/24311572","citation_count":23,"is_preprint":false},{"pmid":"19052026","id":"PMC_19052026","title":"Higher expression of deoxyuridine triphosphatase (dUTPase) may predict the metastasis potential of colorectal cancer.","date":"2008","source":"Journal of clinical pathology","url":"https://pubmed.ncbi.nlm.nih.gov/19052026","citation_count":23,"is_preprint":false},{"pmid":"21411327","id":"PMC_21411327","title":"β-Branched acyclic nucleoside analogues as inhibitors of Plasmodium falciparum dUTPase.","date":"2011","source":"Bioorganic & medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/21411327","citation_count":23,"is_preprint":false},{"pmid":"19302784","id":"PMC_19302784","title":"Molecular shape and prominent role of beta-strand swapping in organization of dUTPase oligomers.","date":"2009","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/19302784","citation_count":23,"is_preprint":false},{"pmid":"28729658","id":"PMC_28729658","title":"Differential control of dNTP biosynthesis and genome integrity maintenance by the dUTPase superfamily enzymes.","date":"2017","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/28729658","citation_count":22,"is_preprint":false},{"pmid":"7663176","id":"PMC_7663176","title":"dUTPase from the retrovirus equine infectious anemia virus: high-level expression in Escherichia coli and purification.","date":"1995","source":"Protein expression and purification","url":"https://pubmed.ncbi.nlm.nih.gov/7663176","citation_count":22,"is_preprint":false},{"pmid":"8922474","id":"PMC_8922474","title":"Cloning and expression of the Epstein-Barr virus-encoded dUTPase: patients with acute, reactivated or chronic virus infection develop antibodies against the enzyme.","date":"1996","source":"The Journal of general virology","url":"https://pubmed.ncbi.nlm.nih.gov/8922474","citation_count":22,"is_preprint":false},{"pmid":"9228681","id":"PMC_9228681","title":"Attenuation of dUTPase-deficient pseudorabies virus for the natural host.","date":"1997","source":"Veterinary microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/9228681","citation_count":22,"is_preprint":false},{"pmid":"9250362","id":"PMC_9250362","title":"A consensus sequence for a functional human endogenous retrovirus K (HERV-K) dUTPase.","date":"1997","source":"Biochemistry and cell biology = Biochimie et biologie cellulaire","url":"https://pubmed.ncbi.nlm.nih.gov/9250362","citation_count":22,"is_preprint":false},{"pmid":"28073829","id":"PMC_28073829","title":"dUTPase (DUT) Is Mutated in a Novel Monogenic Syndrome With Diabetes and Bone Marrow Failure.","date":"2017","source":"Diabetes","url":"https://pubmed.ncbi.nlm.nih.gov/28073829","citation_count":21,"is_preprint":false},{"pmid":"29531348","id":"PMC_29531348","title":"Structural model of human dUTPase in complex with a novel proteinaceous inhibitor.","date":"2018","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/29531348","citation_count":21,"is_preprint":false},{"pmid":"12799180","id":"PMC_12799180","title":"Identification of sequence determinants of human nuclear dUTPase isoform localization.","date":"2003","source":"Experimental cell research","url":"https://pubmed.ncbi.nlm.nih.gov/12799180","citation_count":21,"is_preprint":false},{"pmid":"25841100","id":"PMC_25841100","title":"Cross-species inhibition of dUTPase via the Staphylococcal Stl protein perturbs dNTP pool and colony formation in Mycobacterium.","date":"2015","source":"DNA repair","url":"https://pubmed.ncbi.nlm.nih.gov/25841100","citation_count":21,"is_preprint":false},{"pmid":"22437317","id":"PMC_22437317","title":"Protective effect of human endogenous retrovirus K dUTPase variants on psoriasis susceptibility.","date":"2012","source":"The Journal of investigative dermatology","url":"https://pubmed.ncbi.nlm.nih.gov/22437317","citation_count":21,"is_preprint":false},{"pmid":"30987342","id":"PMC_30987342","title":"CRISPR/Cas9-Mediated Knock-Out of dUTPase in Mice Leads to Early Embryonic Lethality.","date":"2019","source":"Biomolecules","url":"https://pubmed.ncbi.nlm.nih.gov/30987342","citation_count":20,"is_preprint":false},{"pmid":"17452782","id":"PMC_17452782","title":"Structures of vaccinia virus dUTPase and its nucleotide complexes.","date":"2007","source":"Acta crystallographica. Section D, Biological crystallography","url":"https://pubmed.ncbi.nlm.nih.gov/17452782","citation_count":20,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50186,"output_tokens":5700,"usd":0.118029,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14626,"output_tokens":4141,"usd":0.088328,"stage2_stop_reason":"end_turn"},"total_usd":0.206357,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1992,\n      \"finding\": \"Crystal structure of E. coli dUTPase determined at 1.9 Å resolution, revealing the enzyme is a symmetrical homotrimer with a jelly-roll fold lacking the classical nucleotide-binding domain; conserved sequence elements are located at subunit interfaces, suggesting inter-subunit interactions contribute to catalysis.\",\n      \"method\": \"X-ray crystallography\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — atomic resolution crystal structure with functional interpretation; foundational structural study replicated and extended by multiple subsequent structural papers\",\n      \"pmids\": [\"1311056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Crystal structure of E. coli dUTPase in complex with substrate analogue dUDP at atomic resolution shows three dUDP molecules bound symmetrically per trimer in shallow clefts between adjacent subunits, with conserved residues contacting the uracil ring and deoxypentose; positions of phosphate groups and adjacent water molecules inform the catalytic mechanism.\",\n      \"method\": \"X-ray crystallography with bound inhibitor/substrate analogue\",\n      \"journal\": \"Nature structural biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution enzyme-ligand co-crystal structure; mechanistic detail independently validated by kinetic studies\",\n      \"pmids\": [\"8646539\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Kinetic characterization of E. coli dUTPase showed: strict specificity for dUTP (dCTP hydrolyzed ~10^5 times less efficiently); kcat 6–9 s⁻¹; Km ~10⁻⁷ M near neutral pH; Mg²⁺ enhances dUTP binding ~100-fold; only one enantiomer of a thio-dUTP analogue is hydrolyzed; protons released concertedly after the rate-limiting step; proposed mechanism involves Mg²⁺ binding at α-phosphate with rate-limiting hydrolysis by a shielded water molecule.\",\n      \"method\": \"Steady-state and pre-steady-state enzymology, pH-rate studies, isotope effects, substrate stereochemistry\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — comprehensive in vitro kinetic analysis with multiple orthogonal methods in a single detailed study\",\n      \"pmids\": [\"8798636\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Human DUT gene encodes both nuclear (DUT-N) and mitochondrial (DUT-M) isoforms via alternative 5' exon usage from the same gene. DUT-M contains a 69-residue mitochondrial targeting presequence that is cleaved upon import, producing a 23 kDa mature protein. DUT-N is cell-cycle-regulated (elevated during DNA replication), whereas DUT-M is constitutively expressed.\",\n      \"method\": \"cDNA cloning, in vitro transcription/translation, mitochondrial import assay, Northern/Western blot, isoelectric focusing, genomic DNA sequencing\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (import assay, enzymatic activity, IEF, genomic sequencing) establishing both isoform origin and localization mechanism\",\n      \"pmids\": [\"9228092\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Crystal structure of Mycobacterium tuberculosis dUTPase at 1.3 Å in complex with Mg²⁺ and non-hydrolyzable substrate analogue α,β-imido-dUTP reveals that Mg²⁺ coordinates α-, β-, and γ-phosphate groups in tridentate geometry, stabilising the α-phosphorus for in-line nucleophilic attack; a transiently ordered C-terminal loop shields the general-base Asp83 from solvent, raising its pKa to activate a water molecule for nucleophilic attack.\",\n      \"method\": \"X-ray crystallography with Mg²⁺ and substrate analogue\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — 1.3 Å resolution enzyme-substrate analogue-metal co-crystal structure providing detailed mechanistic insight\",\n      \"pmids\": [\"15276840\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Pre-steady-state and steady-state kinetics of human dUTPase (using an engineered tryptophan fluorescence sensor in the active site) revealed the catalytic cycle consists of four steps: (i) fast substrate binding, (ii) isomerization to catalytically competent conformation, (iii) rate-limiting hydrolysis (chemical step), and (iv) rapid non-ordered product release. Proton release is concomitant with the rate-limiting hydrolysis step.\",\n      \"method\": \"Pre-steady-state kinetics (stopped-flow fluorescence), quenched-flow with γ-³²P-dUTP, indicator-based rapid kinetic assays, site-directed mutagenesis (Trp sensor)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal kinetic methods in one rigorous study, with engineered fluorescent sensor and mutagenesis\",\n      \"pmids\": [\"17848562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Phosphorylation of human nuclear dUTPase at Ser11 (adjacent to its NLS) occurs specifically during M phase of the cell cycle, mediated by cell-cycle kinase activity, and abolishes nuclear import by significantly weakening interaction with importin-α. Crystal structures of importin-α bound to wild-type and phosphomimetic (S11E) dUTPase NLS peptides provide structural explanation for this regulation.\",\n      \"method\": \"X-ray crystallography, isothermal titration calorimetry, cell biological localization studies with phosphomimetic/phosphoablative mutants, NLS-importin-α binding assays\",\n      \"journal\": \"Acta crystallographica Section D\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — crystal structures plus binding thermodynamics plus cell biological validation, multiple orthogonal methods in one study\",\n      \"pmids\": [\"24311590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The N-terminal 23 amino acids of human DUT-N are required (but not sufficient) for nuclear localization; a cluster of basic residues K14R15R17 constitutes a functional nuclear localization signal whose mutation completely abolishes nuclear import. Ser11 phosphorylation (noted in this paper) does not affect DUT-N nuclear localization in the GFP-fusion system used here.\",\n      \"method\": \"GFP fusion constructs, deletion analysis, site-directed mutagenesis, fluorescence microscopy\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean mutagenesis with GFP reporter in cell culture, single lab but multiple mutants tested\",\n      \"pmids\": [\"12799180\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CRISPR/Cas9 knock-out of dUTPase in mice is embryonic lethal: dut⁻/⁻ embryos reach the blastocyst stage but die shortly after implantation, with perturbed growth of both inner cell mass and trophectoderm; heterozygous dut⁺/⁻ animals are viable with reduced dUTPase levels.\",\n      \"method\": \"CRISPR/Cas9 gene editing in mice, embryo analysis, blastocyst staging\",\n      \"journal\": \"Biomolecules\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean mammalian knock-out model with defined embryonic lethal phenotype; directly establishes essentiality of DUT in mammalian development\",\n      \"pmids\": [\"30987342\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DUT mutation (p.Y54C in DUT-N / p.Y142C in DUT-M) identified as the cause of a monogenic syndrome with early-onset diabetes and bone marrow failure. DUT silencing in human and rat pancreatic β-cells causes apoptosis via the intrinsic cell death pathway, demonstrating that DUT is required for β-cell survival.\",\n      \"method\": \"Whole-exome sequencing (patient genetics), siRNA knockdown in pancreatic β-cells, apoptosis assays\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — human genetics corroborated by functional cell-based knockdown with defined apoptotic readout, single lab\",\n      \"pmids\": [\"28073829\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Human dUTPase (nuclear isoform) is phosphorylated in a cell-cycle-dependent manner in mature T cells; phosphorylated and unphosphorylated forms accumulate in a proliferation-dependent manner, whereas immature thymocytes constitutively express both forms independent of cell cycle.\",\n      \"method\": \"2D PAGE, cDNA cloning from partial protein sequence, Western blot\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct detection of phosphoprotein by 2D gel with cell-cycle correlation; single lab, no writer/eraser identified\",\n      \"pmids\": [\"8389461\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"siRNA-mediated suppression of dUTPase in human cancer cell lines SW620 and MCF-7 significantly expands dUTP pools following thymidylate synthase inhibition, enhances DNA double-strand break formation, and decreases FUdR IC₅₀ ~75-fold and ~6-fold respectively, demonstrating that dUTPase controls cellular dUTP levels and protects cells from uracil-misincorporation-induced DNA damage.\",\n      \"method\": \"siRNA knockdown, nucleotide pool measurements, clonogenic survival assay, DNA damage assays (DSBs)\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean siRNA knockdown with multiple orthogonal biochemical and cellular readouts, replicated across cell lines\",\n      \"pmids\": [\"15322254\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"dUTPase activity loss in S. cerevisiae (dut1-1 mutant with G82S substitution near active site) causes growth delay, cell cycle abnormalities, and a strong spontaneous mutator phenotype. All phenotypes are suppressed by inactivation of uracil-DNA glycosylase (Ung1), establishing that dUTPase phenotypes arise from dUMP incorporation into DNA followed by uracil excision creating AP sites.\",\n      \"method\": \"Yeast genetics (viable dut1-1 allele), double-mutant epistasis (dut1-1 ung1), mutation spectrum analysis, cell cycle analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with multiple suppressor combinations and mutation spectrum analysis clearly defines pathway position\",\n      \"pmids\": [\"16617146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"E. coli dut recA double mutants are synthetically lethal, and chromosomal fragmentation (double-strand DNA breaks) is detected in dut rec mutants. The synthetic lethality and fragmentation are suppressed by inactivating uracil-DNA glycosylase (ung) or dCTP deaminase (dcd), showing dUTPase loss causes DSBs via a uracil-excision intermediate requiring RecBC-RuvABC recombinational repair for viability.\",\n      \"method\": \"Genetic epistasis (synthetic lethality screen), pulsed-field gel electrophoresis to detect DSBs, multiple suppressor combinations\",\n      \"journal\": \"Molecular microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with multiple suppressor combinations and direct DSB detection\",\n      \"pmids\": [\"14982624\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"A conserved aromatic stacking interaction between dUTPase and the uracil moiety of its substrate contributes to stabilisation of an associative-type transition state during α-phosphate hydrolysis; the π-π interaction remote from the hydrolysis site accelerates catalysis. Crystallographic, kinetic, spectroscopic, and thermodynamic data support this mechanism.\",\n      \"method\": \"X-ray crystallography, enzyme kinetics, optical spectroscopy, thermodynamics calculations, site-directed mutagenesis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multi-method study combining structure, mutagenesis, and kinetics in one rigorous report\",\n      \"pmids\": [\"20601405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"C-terminal β-strand swapping between subunits is critical for dUTPase homotrimer organisation; truncation of the C-terminus before the swapping arm prevents trimer formation in human dUTPase. Mutations of a conserved hinge proline destabilise human and E. coli dUTPases without preventing trimeric organisation.\",\n      \"method\": \"X-ray crystallography (Drosophila dUTPase dimer crystal), small-angle X-ray scattering, site-directed mutagenesis, C-terminal truncations\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — crystal structure plus SAXS plus mutagenesis establish structural basis of oligomerisation\",\n      \"pmids\": [\"19302784\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Overexpression of ribonucleotide reductase subunit R2 in non-tumorigenic cells causes genome instability (replication fork alterations, elevated genomic uracil, fragile-site breaks) that is fully abolished by dUTPase overexpression, demonstrating that dUTPase activity directly controls dUTP-driven genome instability downstream of RNR.\",\n      \"method\": \"Stable R2 overexpression, dUTPase overexpression, replication fork assays, genomic uracil measurement, fragile-site analysis\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional epistasis by overexpression with multiple cellular readouts; single lab\",\n      \"pmids\": [\"27452458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"HSV-1 protein kinase Us3 phosphorylates viral dUTPase (vdUTPase) at Ser187 in infected cells; this phosphorylation is required for optimal dUTPase enzymatic activity and promotes HSV-1 replication in neuronal (SK-N-SH) but not Vero/HEp-2 cells. Phosphomimetic substitution at Ser187 rescues both enzymatic activity and viral replication defects caused by kinase-dead Us3.\",\n      \"method\": \"Large-scale phosphoproteomics (TiO₂/MS), in vitro kinase assay, phosphate-affinity PAGE, site-directed mutagenesis (S187A phosphomimetic), viral replication assays\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (MS identification, in vitro kinase assay, phospho-PAGE, mutagenesis with rescue) in one study\",\n      \"pmids\": [\"24173231\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1988,\n      \"finding\": \"Chromosomal dut null mutations are lethal in E. coli even in the presence of compensatory metabolic mutations (dcd, cdd, ung, deoA, sulA, alone or combined), suggesting dUTPase has an essential function beyond its nucleotide pool-cleansing role.\",\n      \"method\": \"Allelic exchange, generalized transduction, genetic complementation in multiple mutant backgrounds\",\n      \"journal\": \"Journal of bacteriology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple genetic backgrounds tested; lethality well established but the 'additional essential function' was not further mechanistically defined in this paper\",\n      \"pmids\": [\"2830228\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The Staphylococcal repressor Stl forms a stable complex with human dUTPase trimers, inhibiting dUTPase enzymatic activity; active-site-forming segments of dUTPase are directly involved in the Stl interaction (identified by HDX-MS). Complex formation dissociates the Stl homodimer, abolishing Stl's DNA-binding ability.\",\n      \"method\": \"SAXS, hydrogen-deuterium exchange mass spectrometry (HDX-MS), functional enzymatic assays, DNA-binding assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — SAXS structural model plus HDX-MS site identification plus functional assays; single lab\",\n      \"pmids\": [\"29531348\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Eukaryotic (Drosophila) dUTPase, unlike the bacterial enzyme, shows Mg²⁺-dependent conformational changes, and product dUMP induces protection against proteolysis (closed active-site conformation); the C-terminal arm is critical for activity; a stable but inactive homotrimeric core domain is generated by limited trypsinolysis. Crystallographic analysis reveals a stable monomer in the crystal phase (distinct from trimeric bacterial enzyme).\",\n      \"method\": \"X-ray crystallography, kinetic analysis, limited proteolysis, fluorescence spectroscopy, differential scanning calorimetry\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with kinetic and spectroscopic studies; multiple orthogonal methods revealing mechanistic differences from prokaryotic dUTPase\",\n      \"pmids\": [\"14724274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In a mycobacterial model encoding both Dut (monofunctional dUTPase) and Dcd:dut (bifunctional dCTP deaminase/dUTPase), Dut specifically prevents DNA uracilation (dut mutant increases genomic uracil and mutation rate) without affecting dTTP/dCTP balance, while Dcd:dut controls dNTP balance without affecting DNA uracil content. The two enzyme activities are functionally decoupled.\",\n      \"method\": \"Genetic knock-out/knock-down in Mycobacterium smegmatis, genomic uracil measurement, dNTP pool analysis, mutation rate assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic separation of two enzyme activities with biochemical readouts; mechanistically definitive\",\n      \"pmids\": [\"28729658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Drosophila dUTPase is expressed as two isoforms during development (identified at mRNA and protein levels); expression decreases drastically at the protein level during larval stages despite constitutive mRNA levels, indicating multilevel regulation; macromolecular protein partners of dUTPase were verified by independent approaches, and a putative nuclear localization signal is present in one isoform, though subcellular localisation is not strictly determined by the NLS alone.\",\n      \"method\": \"Western blot, Northern blot, immunohistochemistry, co-purification approaches for interacting partners\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — interacting partners verified but not identified; NLS present but localisation ambiguous; single lab, limited mechanistic detail\",\n      \"pmids\": [\"14996835\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Human DUT encodes nuclear (DUT-N) and mitochondrial (DUT-M) isoforms from the same gene via alternative 5' exon usage; both are homotrimeric enzymes that hydrolyze dUTP to dUMP and pyrophosphate via a Mg²⁺-assisted, rate-limiting in-line nucleophilic attack on the α-phosphate facilitated by an active-site general base, aromatic stacking of the uracil moiety, and a C-terminal arm that closes over the active site; DUT-N nuclear import is regulated by cell-cycle-dependent phosphorylation at Ser11 (M-phase) which weakens importin-α binding and excludes dUTPase from the nucleus; the enzyme is essential for mammalian embryonic development (dut⁻/⁻ mice die post-implantation) and for pancreatic β-cell survival, functioning to prevent uracil misincorporation into DNA by maintaining low cellular dUTP pools and providing dUMP substrate for thymidylate biosynthesis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DUT encodes dUTPase, an essential nucleotide-metabolic enzyme that hydrolyzes dUTP to dUMP and pyrophosphate, simultaneously cleansing the cellular dUTP pool to block uracil misincorporation into DNA and supplying dUMP for thymidylate biosynthesis [#11, #12]. The enzyme is a symmetrical homotrimer built on a jelly-roll fold lacking the classical nucleotide-binding domain, with active sites formed at the interfaces between adjacent subunits and a C-terminal arm that swaps between subunits to organize the trimer and closes over the active site during catalysis [#0, #1, #15, #20]. Catalysis proceeds through Mg²⁺-assisted, in-line nucleophilic attack on the α-phosphate by a water molecule activated by an active-site general base whose pKa is raised by a transiently ordered C-terminal loop, with aromatic stacking of the uracil ring stabilizing the transition state; the multistep cycle (binding, isomerization, rate-limiting hydrolysis, product release) releases protons concomitant with the chemical step [#2, #4, #5, #14]. Human DUT produces a nuclear isoform (DUT-N) and a mitochondrial isoform (DUT-M) via alternative 5' exon usage, the latter carrying a cleavable targeting presequence; DUT-N nuclear import depends on a basic NLS (K14/R15/R17) and is controlled by cell-cycle-dependent phosphorylation at Ser11, which during M phase weakens importin-α binding and excludes the enzyme from the nucleus [#3, #6, #7, #10]. The downstream importance of this pool control is established genetically: dUTPase loss elevates genomic uracil and, through uracil-DNA glycosylase-mediated excision, generates AP sites and double-strand breaks that demand recombinational repair, while restoring dUTPase activity abolishes dUTP-driven genome instability [#12, #13, #16]. DUT is essential for mammalian embryonic development (dut⁻/⁻ mice die after implantation) and for pancreatic β-cell survival, and a DUT point mutation causes a monogenic syndrome of early-onset diabetes and bone marrow failure [#8, #9].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Established the architecture of dUTPase, showing it is a symmetrical homotrimer with a jelly-roll fold and inter-subunit active sites rather than a conventional nucleotide-binding enzyme.\",\n      \"evidence\": \"1.9 Å X-ray crystal structure of E. coli dUTPase\",\n      \"pmids\": [\"1311056\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No bound substrate/metal to define catalytic geometry\", \"Eukaryotic enzyme architecture not yet addressed\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Defined how substrate is recognized and how the catalytic chemistry works, locating the uracil/deoxyribose contacts and assigning Mg²⁺ and a shielded water to rate-limiting α-phosphate hydrolysis.\",\n      \"evidence\": \"Co-crystal with dUDP plus comprehensive steady-state and pre-steady-state kinetics of E. coli enzyme\",\n      \"pmids\": [\"8646539\", \"8798636\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"General base not yet identified by residue\", \"Conformational dynamics during the cycle not resolved\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Resolved how a single gene serves two compartments, showing alternative 5' exon usage generates a cell-cycle-regulated nuclear isoform and a constitutive mitochondrial isoform with a cleavable presequence.\",\n      \"evidence\": \"cDNA cloning, mitochondrial import assay, IEF, genomic sequencing of human DUT\",\n      \"pmids\": [\"9228092\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional requirement for the mitochondrial pool not tested\", \"Import/regulatory machinery not identified\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Provided the atomic mechanism of catalysis and revealed eukaryote-specific conformational behavior, defining Mg²⁺ tridentate coordination, a general-base aspartate shielded by an ordered C-terminal loop, and product-induced active-site closure.\",\n      \"evidence\": \"1.3 Å M. tuberculosis structure with Mg²⁺ and imido-dUTP; Drosophila crystallography with proteolysis/calorimetry; yeast and E. coli epistasis defining the uracil-excision pathway\",\n      \"pmids\": [\"15276840\", \"14724274\", \"16617146\", \"14982624\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Human-specific transition-state details not yet shown\", \"Quantitative contribution of C-terminal arm dynamics unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrated the cellular consequence of pool control, showing dUTPase suppression expands dUTP pools, causes uracil-misincorporation DSBs, and sensitizes cancer cells to thymidylate synthase-directed therapy.\",\n      \"evidence\": \"siRNA knockdown in SW620/MCF-7 with nucleotide pool, DSB, and clonogenic/FUdR sensitivity readouts\",\n      \"pmids\": [\"15322254\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not separate nuclear vs mitochondrial isoform contributions\", \"In vivo therapeutic relevance not tested\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Dissected the human catalytic cycle into discrete kinetic steps, identifying isomerization to a competent conformation and a rate-limiting chemical step coupled to proton release.\",\n      \"evidence\": \"Pre-steady-state stopped-flow/quenched-flow with an engineered active-site tryptophan sensor in human dUTPase\",\n      \"pmids\": [\"17848562\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural state of the isomerized intermediate not captured\", \"Regulation of cycle in cellular context unaddressed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Explained the structural basis of oligomerization, showing C-terminal β-strand swapping between subunits is required for trimer assembly and that a hinge proline stabilizes the fold.\",\n      \"evidence\": \"Drosophila crystal structure, SAXS, C-terminal truncations and hinge-proline mutagenesis across species\",\n      \"pmids\": [\"19302784\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of monomerization in cells not tested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified a remote catalytic enhancer, showing π-π stacking on the uracil ring stabilizes an associative transition state and accelerates α-phosphate hydrolysis.\",\n      \"evidence\": \"Combined crystallography, kinetics, spectroscopy, thermodynamics and mutagenesis\",\n      \"pmids\": [\"20601405\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Magnitude of contribution across orthologs not generalized\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined the regulatory logic of nuclear access, showing M-phase phosphorylation at Ser11 weakens importin-α binding to exclude dUTPase from the nucleus, integrating localization with the cell cycle.\",\n      \"evidence\": \"Importin-α/NLS-peptide crystal structures, ITC, and localization of phosphomimetic/phosphoablative mutants; earlier 2D-PAGE showing cell-cycle-dependent phosphorylation in T cells; prior GFP-mapping of the K14R15R17 NLS\",\n      \"pmids\": [\"24311590\", \"8389461\", \"12799180\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the M-phase kinase not established\", \"The 2003 GFP system did not detect a phospho-effect, leaving context dependence unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Placed dUTPase as a direct buffer of replication-stress-driven instability, showing its activity abolishes the genome instability caused by ribonucleotide reductase R2 overexpression.\",\n      \"evidence\": \"R2 and dUTPase overexpression with replication-fork, genomic uracil, and fragile-site assays\",\n      \"pmids\": [\"27452458\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Overexpression-based epistasis only\", \"Endogenous-level relevance not established\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established mammalian essentiality and disease relevance, showing DUT loss is embryonic lethal, is required for β-cell survival, and that a point mutation causes a diabetes/bone-marrow-failure syndrome; parallel mycobacterial work decoupled DNA-uracilation prevention from dNTP-balance control.\",\n      \"evidence\": \"CRISPR dut⁻/⁻ mouse embryos; whole-exome sequencing plus β-cell siRNA/apoptosis assays; genetic separation of Dut vs Dcd:dut in M. smegmatis\",\n      \"pmids\": [\"30987342\", \"28073829\", \"28729658\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking DUT loss to β-cell-specific apoptosis not fully defined\", \"Whether embryonic lethality reflects pool cleansing vs an additional function unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Characterized a protein-level inhibitory interaction, showing the staphylococcal repressor Stl binds human dUTPase via its active-site-forming segments, inhibiting the enzyme and dissociating the Stl DNA-binding dimer.\",\n      \"evidence\": \"SAXS, HDX-MS, enzymatic and DNA-binding assays of the human dUTPase–Stl complex\",\n      \"pmids\": [\"29531348\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological relevance of the interaction to host biology unclear\", \"High-resolution structure of the complex not determined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The nature of the essential function beyond dUTP-pool cleansing, implied by lethality persisting in metabolically compensated backgrounds, remains undefined.\",\n      \"evidence\": \"Open question raised by E. coli dut lethality in dcd/cdd/ung/deoA/sulA backgrounds and unresolved post-implantation lethality in mice\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No molecular identity for a 'moonlighting' essential function\", \"Distinct roles of nuclear vs mitochondrial isoforms in vivo not separated\", \"M-phase kinase for Ser11 not identified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [2, 4, 5, 11]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [2, 5, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3, 6, 7]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [2, 11, 21]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [12, 13, 16]}\n    ],\n    \"complexes\": [\"dUTPase homotrimer\"],\n    \"partners\": [\"KPNA2\", \"Stl\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}