{"gene":"DDX19B","run_date":"2026-06-09T23:54:41","timeline":{"discoveries":[{"year":1999,"finding":"Human DBP5 (hDbp5/DDX19B) localizes to cytoplasmic fibrils of the nuclear pore complex via direct interaction with the N-terminal region of nucleoporin CAN/NUP214 (yeast Nup159p); in a conditional yeast strain where Nup159p is degraded, Dbp5 dissociates from the NPC and redistributes to the cytoplasm. A dominant-negative DEAD-box (Glu→Gln) mutant of hDbp5 injected into Xenopus oocytes inhibits mRNA nuclear export.","method":"Immunoelectron microscopy, direct protein interaction assays, conditional yeast depletion strain, Xenopus oocyte microinjection with dominant-negative mutant","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (immunoEM, direct binding, in vivo depletion, functional dominant-negative in oocytes), findings replicated across yeast and human systems","pmids":["10428971"],"is_preprint":false},{"year":2004,"finding":"The N-terminal domain of Nup159 (yeast) forms a seven-bladed beta-propeller that directly tethers Dbp5 to the cytoplasmic face of the NPC; structure-guided mutations in a conserved loop abolish in vitro Dbp5 binding, cause Dbp5 mislocalization in vivo, and block mRNA export.","method":"X-ray crystallography (2.5 Å), structure-based mutagenesis, in vitro binding assay, in vivo localization and mRNA export assays in yeast","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with mutagenesis and functional in vivo validation, multiple orthogonal methods","pmids":["15574330"],"is_preprint":false},{"year":2006,"finding":"Gle1 and inositol hexakisphosphate (InsP6) together stimulate the RNA-dependent ATPase activity of Dbp5 at the nuclear pore; InsP6 increases Dbp5 ATPase activity in a Gle1-dependent manner, lowers the effective RNA concentration for half-maximal ATPase activity, and maximal InsP6 binding requires both Dbp5 and Gle1. Overexpression of DBP5 suppresses mRNA export defects of an ipk1 nup42 mutant defective in InsP6 production.","method":"In vitro kinetic ATPase assays, genetic epistasis/suppression in yeast, in vitro binding assays","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro biochemical reconstitution with kinetics, confirmed by independent genetic suppression, replicated in a parallel study (PMID:16783364)","pmids":["16783363"],"is_preprint":false},{"year":2006,"finding":"Gle1 is a direct cellular activator of Dbp5; Dbp5 alone cannot stably bind RNA or effectively hydrolyze ATP under physiological conditions, but Gle1 dramatically stimulates both activities. InsP6 binds directly to Gle1 and potentiates Gle1-mediated stimulation of Dbp5. A gle1 point mutant deficient for Dbp5 stimulation in vitro displays mRNA export defects in vivo; dominant mutations in DBP5 and GLE1 that rescue InsP6-deficient phenotypes mimic InsP6 effects in vitro.","method":"In vitro ATPase and RNA-binding assays, direct binding assays, in vivo mRNA export assays in yeast, structure-guided mutagenesis","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal in vitro and in vivo methods, corroborated by independent concurrent study (PMID:16783363)","pmids":["16783364"],"is_preprint":false},{"year":2007,"finding":"Dbp5 functions as an mRNP remodeling protein by displacing the RNA-binding protein Nab2 from RNA; the ADP-bound form of Dbp5 (not ATP hydrolysis per se) is required for this RNP remodeling activity. In vivo, nab2 and dbp5 mutant analyses confirm that Nab2-bound mRNP is a physiological Dbp5 target at the NPC.","method":"In vitro RNP remodeling/displacement assay, nucleotide-state biochemistry, in vivo genetic analysis of nab2/dbp5 double mutants in yeast","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro reconstituted remodeling assay plus in vivo genetic validation, multiple orthogonal approaches","pmids":["18082609"],"is_preprint":false},{"year":2007,"finding":"Dbp5 participates in translation termination in yeast: it physically interacts with release factor eRF1, genetically interacts with both eRF1 and eRF3 and poly(A)-binding protein Pab1, its helicase activity is required for efficient stop-codon recognition, and intact Dbp5 is essential for recruitment of eRF3 into termination complexes.","method":"Co-immunoprecipitation (physical interaction with eRF1), genetic interaction analysis, in vivo translation termination assays, dbp5 helicase mutant analysis in yeast","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal genetic and physical interaction data, functional helicase mutant analysis, multiple orthogonal in vivo approaches","pmids":["17272721"],"is_preprint":false},{"year":2009,"finding":"Crystal structures of human DBP5 bound to RNA+AMPPNP and bound to the cytoplasmic nucleoporin NUP214 reveal that RNA binding and NUP214 binding are mutually exclusive. NUP214 decreases both RNA-binding and ATPase activities of DBP5 in vitro; the interaction is mediated by conserved residues.","method":"X-ray crystallography (two structures), in vitro ATPase assays, in vitro RNA-binding assays, mutagenesis","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structures combined with in vitro biochemical validation and mutagenesis","pmids":["19219046"],"is_preprint":false},{"year":2009,"finding":"X-ray crystallography of human DDX19 in RNA-bound (closed cleft) and free (open cleft, posthydrolysis) states reveals an N-terminal alpha-helix that inserts between the conserved RecA-like domains of the free protein to negatively autoregulate ATPase activity; biochemical assays confirm the autoregulatory function of the N-terminal region.","method":"X-ray crystallography (two conformational states), in vitro ATPase biochemical assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structures in two states validated by biochemical analysis, single study but with two orthogonal methods","pmids":["19244245"],"is_preprint":false},{"year":2009,"finding":"Crystal structure of the Nup214 N-terminal domain in complex with DDX19 in its ADP-bound state reveals that the helicase interaction surface carries a positive charge and the Nup214 surface a negative charge; this structural framework suggests a basis for competitive displacement of Nup214 by RNA during mRNP remodeling.","method":"X-ray crystallography (2.5 Å co-crystal structure)","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — high-quality crystal structure but functional validation is largely interpretive rather than experimentally tested within this paper","pmids":["19208808"],"is_preprint":false},{"year":2009,"finding":"Crystal structure of the C-terminal domain of Dbp5 at 1.8 Å reveals a RecA-like fold with a unique C-terminal alpha-helix and a distinctive loop; structure-guided mutagenesis of charged surface residues identifies specific residues required for Gle1 binding and Gle1-stimulated ATPase activity, and the same mutations block yeast growth, establishing a threshold level of Dbp5 ATPase activity required for mRNA export.","method":"X-ray crystallography (1.8 Å), structure-based mutagenesis, in vitro ATPase assays, in vivo yeast growth and mRNA export assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure plus mutagenesis with both in vitro biochemical and in vivo functional correlation","pmids":["19805289"],"is_preprint":false},{"year":2009,"finding":"The nuclear export factor RBM15 binds specifically to human DBP5 and facilitates direct DBP5 contact with mRNA in vivo; RBM15 co-localizes with DBP5 and NXF1 at the nuclear envelope. Gene silencing of RBM15 causes cytoplasmic depletion and nuclear accumulation of mRNA, indicating RBM15 is required for efficient mRNA export.","method":"Co-immunoprecipitation, co-localization by microscopy, RNA immunoprecipitation, RNAi knockdown with mRNA export readout","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP and co-localization with functional knockdown validation, single lab but multiple methods","pmids":["19786495"],"is_preprint":false},{"year":2011,"finding":"Nup159 is specifically required for ADP release from Dbp5; Gle1-IP6 stimulates ATP binding to Dbp5 (priming it for RNA loading); in vivo, a dbp5 mutant with reduced ADP binding (R256D/R259D) bypasses the need for Nup159 interaction. This establishes Nup159 as an ADP release factor and Gle1-IP6 as a driver of ATP re-loading, defining a multi-step nucleotide cycle for Dbp5 at the NPC.","method":"In vitro nucleotide exchange/release assays (reconstitution), in vivo suppressor/bypass genetics in yeast, mRNA export assays","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro biochemical reconstitution of nucleotide exchange steps corroborated by genetic suppressor analysis in vivo","pmids":["21576266"],"is_preprint":false},{"year":2011,"finding":"ATP binding and hydrolysis are required for efficient Dbp5 association with NPCs. RNA-binding-deficient Dbp5 mutants act as dominant negatives for mRNA export in both yeast and human cells by competing with wild-type Dbp5 for Gle1 at NPCs; the Dbp5-Gle1 interaction is rate-limiting for export and can occur independently of Nup159. FRAP shows Dbp5 associates with NPCs very dynamically (<1 s).","method":"Mutagenesis (ATP binding, hydrolysis, RNA-binding mutations), dominant-negative analysis in yeast and human cells, FRAP at NPCs, in vivo mRNA export assays","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple mutant classes with in vivo functional readouts in two organisms, FRAP kinetics, complementing parallel study (PMID:21576266)","pmids":["21576265"],"is_preprint":false},{"year":2013,"finding":"A SLIP1-binding motif (SBM) in DBP5 mediates direct interaction with SLIP1 (a MIF4G-like translation factor); crystal structure (3.25 Å) of SLIP1 bound to the DBP5 SBM was determined and interaction confirmed by pull-down assays, linking DBP5 to the histone mRNA translation machinery.","method":"X-ray crystallography (3.25 Å co-crystal), pull-down assays","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — crystal structure with pull-down confirmation, but functional consequence of DBP5-SLIP1 interaction not directly tested in this study","pmids":["23804756"],"is_preprint":false},{"year":2015,"finding":"Dbp5 kinetics: Pi release is the rate-limiting step of the intrinsic Dbp5 ATPase cycle; RNA increases kcat and Pi release rate ~20-fold, though Pi release continues to limit steady-state cycling even with RNA. ADP binds an order of magnitude more tightly than ATP (KD ~0.4 mM vs KT ~4 mM).","method":"In vitro kinetic and equilibrium ATPase analysis (stopped-flow, fluorescence-based Pi release assays)","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — rigorous in vitro kinetic reconstitution with multiple biochemical measurements, single lab","pmids":["26730886"],"is_preprint":false},{"year":2015,"finding":"Ddx19 is required for nuclear import of the SRF coactivator MKL1; this function is separate from its mRNA export role. RNA-binding activity of Ddx19 is required for MKL1 nuclear import, whereas helicase activity and NPC-binding are dispensable. Ddx19 modulates the conformation of MKL1 to affect its interaction with Importin-β.","method":"RNAi knockdown, dominant-negative and mutant analysis (helicase-dead, RNA-binding, NPC-binding mutants), co-immunoprecipitation, nuclear import assays in mammalian cells","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple separation-of-function mutants tested in cells, Co-IP, functional nuclear import readout, single lab but multiple orthogonal methods","pmids":["25585691"],"is_preprint":false},{"year":2016,"finding":"Dbp5 is required for nuclear export of both pre-ribosomal subunits in yeast; however, unlike mRNA export, ATPase-deficient dbp5 mutants do not block ribosomal export, and gle1 mutants show no major ribosomal export defects. Dbp5 physically and genetically interacts with Nmd3 (a ribosomal transport factor). This establishes that Dbp5 uses a distinct, ATPase-independent mechanism for ribosomal subunit export.","method":"Temperature-sensitive dbp5 mutants in yeast (nuclear accumulation of pre-ribosomal subunits), genetic interaction analysis, co-immunoprecipitation with Nmd3, ATPase-deficient mutant analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and physical interaction data with specific mutant classes, single lab, multiple approaches","pmids":["26872259"],"is_preprint":false},{"year":2017,"finding":"Ddx19 transiently relocalizes from the nuclear pore to the nucleus upon DNA damage/replication stress in an ATR/Chk1-dependent manner; nuclear Ddx19 resolves R-loops in vitro via its helicase activity; Ddx19 depletion induces R-loop accumulation and DNA damage specifically in proliferating cells. A phosphorylation-mimetic mutation of a Chk1 target residue disrupts Ddx19 interaction with Nup214 and promotes nuclear relocalization.","method":"Live-cell imaging, immunofluorescence, in vitro helicase/R-loop resolution assay, siRNA knockdown, phosphomutant analysis, DNA fiber assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro helicase activity on R-loops confirmed, in vivo live-cell relocalization, ATR/Chk1 pathway epistasis, phosphomutant functional analysis, multiple orthogonal methods","pmids":["28314779"],"is_preprint":false},{"year":2017,"finding":"Human DDX19 participates in translation termination in vitro: it associates with translating ribosome fractions, binds pre-termination complexes in a nucleotide-dependent manner, increases efficiency of termination complex formation and peptide release by eukaryotic release factors, and stabilizes elongating ribosome complexes with eEF1 and eEF2. DDX19 activation of termination occurs at the stop codon recognition step.","method":"Reconstituted mammalian in vitro translation system, ribosome fractionation, eRF1(AGQ) mutant and non-hydrolyzable GTP analog to dissect termination steps, co-sedimentation assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstituted translation system with mechanistic dissection using multiple mutant tools, single lab","pmids":["28180304"],"is_preprint":false},{"year":2017,"finding":"The Nup42–Gle1 interaction is integral to Dbp5/DDX19B activation and efficient mRNA export; a trimeric Nup42-CTD/Gle1-CTD/Dbp5 complex forms in the presence of IP6. Deletion of NUP42 abrogates Gle1-Dbp5 interaction. Nup42-CTD and IP6 stimulate Gle1/hGle1B activation of Dbp5 and DDX19B in non-additive manners in vitro. Disruption of Nup42 or IP6 binding interfaces on Gle1/hGle1B causes defective mRNA export in both yeast and human cells.","method":"In vitro ATPase reconstitution assays, Co-IP/pull-down (trimeric complex), in vivo mRNA export assays in yeast and human cells, structure-function mutagenesis","journal":"Traffic (Copenhagen, Denmark)","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — biochemical reconstitution with human and yeast proteins, in vivo validation in two organisms, multiple methods","pmids":["28869701"],"is_preprint":false},{"year":2018,"finding":"Nup159 does not accelerate ADP release from Dbp5 (contradicting a previous model); instead, Gle1 slows ADP release from Dbp5, independent of Mg2+. In the presence of Nup159, the Gle1-ADP-Dbp5 interaction is weakened ~18-fold, suggesting Nup159 promotes Gle1 release from Dbp5 rather than acting as a nucleotide exchange factor.","method":"Solution-based in vitro kinetic and equilibrium binding assays (fluorescence, stopped-flow), ADP/ATP release measurements","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — rigorous in vitro kinetic assays but findings contradict the prior Noble et al. model; single lab; not independently replicated","pmids":["29782832"],"is_preprint":false},{"year":2019,"finding":"DDX19 negatively regulates type I interferon production: DDX19 inhibits TBK1- and IKKε-mediated phosphorylation of IRF3 by disrupting the TBK1/IKKε–IRF3 interaction, recruits Lamtor2 to form a TBK1-IKKε-Lamtor2-DDX19-IRF3 complex, and promotes proteasomal degradation of TBK1 and IKKε. Ddx19 knockout mice show augmented type I IFN production and suppressed encephalomyocarditis virus replication.","method":"Ectopic expression/knockdown in cell lines, co-immunoprecipitation, TALEN-generated Ddx19 knockout mice, viral infection assays","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, KO mouse with in vivo phenotype, multiple cell-based assays, single lab","pmids":["30699353"],"is_preprint":false},{"year":2019,"finding":"Dbp5 contains an N-terminal Xpo1-dependent nuclear export signal identified by alanine-scanning mutagenesis; disruption of this NES impairs nucleocytoplasmic shuttling. Dbp5 nuclear shuttling is not essential for mRNP export, but is required for tRNA export—dbp5 mutants with impaired shuttling exhibit tRNA export defects and altered tRNA dynamics during nutrient stress recovery.","method":"Alanine-scanning mutagenesis (456 viable mutants), GFP-Dbp5 reporter, in vivo tRNA and mRNA export assays, Xpo1 interaction assays in yeast","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic mutagenesis with separation-of-function alleles, functional export assays in vivo, single lab","pmids":["31453808"],"is_preprint":false},{"year":2021,"finding":"DDX19B tethers the CBC-dependent translation initiation factor CTIF to the perinuclear region in a translationally incompetent state; upon mRNA export, DDX19B hands CTIF over to CBP80, enabling CBC-dependent translation initiation specifically in the perinuclear region. Impairing the DDX19B-CTIF interaction causes uncontrolled translation throughout the cytosol and dysregulates nonsense-mediated mRNA decay.","method":"Co-immunoprecipitation, proximity ligation assay, translation reporter assays, NMD reporter assays, dominant-negative and deletion mutant analysis in human cells","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP plus functional translation and NMD assays, single lab, multiple methods","pmids":["34232997"],"is_preprint":false},{"year":2022,"finding":"Gle1 activates Dbp5 ATPase by two mechanisms: (1) thermodynamic coupling between Gle1 and ATP binding to Dbp5 (Gle1 binds Dbp5-ATP >100-fold more tightly than ADP-Dbp5, and Gle1 increases ATP equilibrium binding >150-fold by slowing ATP dissociation); (2) Gle1 accelerates the rate-limiting Pi release step ~20-fold. Pi release remains rate-limiting even in the presence of Gle1.","method":"In vitro kinetic and equilibrium ATPase cycle analysis (fluorescence-based assays, stopped-flow kinetics)","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — rigorous mechanistic in vitro kinetic analysis dissecting two distinct activation mechanisms, single lab with multiple biochemical approaches","pmids":["35286399"],"is_preprint":false},{"year":2022,"finding":"DDX19 is SUMOylated at lysine 26; this SUMO modification enhances DDX19 interaction with Gle1. A SUMOylation-defective K26R mutant of human DDX19B fails to fully rescue mRNA export defects caused by DDX19 depletion, demonstrating that SUMOylation modulates DDX19B function in mRNA export.","method":"In vivo SUMOylation assays, site-directed mutagenesis (K26R), co-immunoprecipitation, mRNA export rescue assays in human cells","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — covalent modification identified by mass spectrometry/mutagenesis with functional rescue assay, single lab","pmids":["35080244"],"is_preprint":false},{"year":2024,"finding":"Dbp5 functions in tRNA export in yeast parallel to canonical export factor Los1; Dbp5 is recruited directly to tRNA independent of Los1, Msn5, or Mex67. Unlike with mRNA, tRNA (or dsRNA) alone does not activate Dbp5 ATPase activity, but tRNA acts synergistically with Gle1 to fully activate Dbp5. A functional ATPase cycle and Gle1 binding are both required for Dbp5-mediated tRNA export.","method":"Genetic epistasis (double mutants with los1, msn5), in vivo co-immunoprecipitation with tRNA, in vitro ATPase assays with tRNA ± Gle1, dominant-negative overexpression, tRNA export assays in yeast","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro biochemical reconstitution combined with genetic epistasis and in vivo co-IP, multiple orthogonal methods, peer-reviewed","pmids":["38189406"],"is_preprint":false}],"current_model":"DDX19B (Dbp5) is a DEAD-box RNA-dependent ATPase that localizes to the cytoplasmic fibrils of the nuclear pore complex via direct interaction with NUP214 (Nup159 in yeast), where its ATPase activity is activated by a trimeric complex of Gle1, Nup42, and inositol hexakisphosphate (InsP6) to drive remodeling of mRNPs—displacing RNA-binding proteins such as Nab2 and NXF1 in an ADP-bound conformational switch—thereby ensuring unidirectional mRNA export; it also resolves nuclear R-loops in an ATR/Chk1-dependent manner upon DNA damage (requiring nuclear relocalization triggered by Chk1-mediated phosphorylation that disrupts its NUP214 interaction), participates in translation termination by delivering eRF1 to the ribosomal stop codon and stabilizing termination and elongation complexes, facilitates tRNA export through a Gle1-dependent ATPase mechanism, tethers the translation initiation factor CTIF to the perinuclear region to spatially restrict CBC-dependent translation, and negatively regulates innate immune signaling by disrupting TBK1/IKKε–IRF3 interactions and promoting TBK1/IKKε degradation, with its activity fine-tuned by SUMOylation at K26 (enhancing Gle1 interaction) and by an autoregulatory N-terminal alpha-helix that suppresses ATPase activity in the unengaged state."},"narrative":{"mechanistic_narrative":"DDX19B (Dbp5) is a DEAD-box RNA-dependent ATPase that drives the terminal, directional step of mRNA nuclear export at the cytoplasmic face of the nuclear pore complex [PMID:10428971, PMID:15574330]. It is tethered to the NPC through direct binding to the N-terminal beta-propeller of nucleoporin NUP214/Nup159, an interaction that is mutually exclusive with RNA binding and that lowers the enzyme's RNA-binding and ATPase activities, positioning the enzyme for cycles of engagement and release [PMID:15574330, PMID:19219046]. Its ATPase activity is allosterically controlled: Gle1, together with inositol hexakisphosphate (InsP6) and Nup42, forms an activating complex that promotes ATP loading, slows ADP release, and accelerates the rate-limiting Pi-release step, while an autoinhibitory N-terminal alpha-helix suppresses activity in the unengaged state [PMID:16783363, PMID:16783364, PMID:19244245, PMID:28869701, PMID:35286399]. Through nucleotide-dependent conformational switching—with the ADP-bound state mediating remodeling—Dbp5 displaces mRNP-bound proteins such as Nab2 to impose directionality on export [PMID:18082609, PMID:21576266]. Beyond mRNA export, DDX19B has multiple distinct activities: it relocalizes to the nucleus upon ATR/Chk1 signaling to resolve R-loops during replication stress via its helicase activity, with Chk1-mediated phosphorylation disrupting its NUP214 anchor [PMID:28314779]; it promotes translation termination by stabilizing pre-termination ribosomal complexes and enhancing release-factor function at stop-codon recognition [PMID:17272721, PMID:28180304]; it mediates Gle1-dependent tRNA export and pre-ribosomal subunit export through mechanisms distinct from mRNA export [PMID:26872259, PMID:31453808, PMID:38189406]; it spatially restricts CBC-dependent translation by tethering the initiation factor CTIF at the perinuclear region [PMID:34232997]; and it negatively regulates type I interferon signaling by disrupting TBK1/IKKε–IRF3 interactions and promoting TBK1/IKKε degradation [PMID:30699353]. Its export function is further tuned by SUMOylation at K26, which enhances Gle1 interaction [PMID:35080244].","teleology":[{"year":1999,"claim":"Established where the enzyme acts and that its catalytic activity is essential for mRNA export, anchoring DDX19B to the NPC cytoplasmic fibrils.","evidence":"ImmunoEM, direct binding, conditional yeast depletion, and dominant-negative DEAD-box mutant in Xenopus oocytes","pmids":["10428971"],"confidence":"High","gaps":["Molecular basis of the NUP214/Nup159 interaction not yet resolved","How ATPase activity couples to export directionality unknown"]},{"year":2004,"claim":"Defined the structural basis of NPC tethering, showing the Nup159 beta-propeller directly binds Dbp5 and that this anchoring is required for export.","evidence":"X-ray crystallography of the Nup159 N-terminal domain with structure-guided mutagenesis and yeast export assays","pmids":["15574330"],"confidence":"High","gaps":["Did not resolve how anchoring relates to the catalytic cycle","Activator requirements not addressed"]},{"year":2006,"claim":"Identified the cofactors that switch Dbp5 from a weak intrinsic enzyme to an active one, establishing Gle1 and InsP6 as direct activators.","evidence":"In vitro kinetic ATPase and RNA-binding assays with genetic suppression in yeast (two concurrent studies)","pmids":["16783363","16783364"],"confidence":"High","gaps":["Stoichiometry and structural basis of the activation complex unresolved","Role of Nup42 not yet incorporated"]},{"year":2007,"claim":"Revealed the physiological output of the ATPase cycle—mRNP remodeling—and that the ADP-bound state, not hydrolysis per se, drives displacement of bound RNA-binding proteins.","evidence":"In vitro RNP displacement assays with nucleotide-state biochemistry plus nab2/dbp5 genetic analysis","pmids":["18082609"],"confidence":"High","gaps":["Whether other mRNP proteins besides Nab2 are remodeled in vivo not fully mapped","Mechanism converting remodeling into directionality not yet defined"]},{"year":2007,"claim":"Extended Dbp5 function beyond export into translation termination, linking it physically and genetically to release factors and stop-codon recognition.","evidence":"Co-IP with eRF1, genetic interaction analysis with eRF1/eRF3/Pab1, and helicase mutant termination assays in yeast","pmids":["17272721"],"confidence":"High","gaps":["Molecular step at which Dbp5 acts in termination not yet defined","Whether this requires NPC localization unclear"]},{"year":2009,"claim":"Provided the structural logic for mutually exclusive RNA versus NUP214 binding and for N-terminal autoinhibition, explaining how the enzyme alternates states during the cycle.","evidence":"Multiple X-ray structures (RNA/AMPPNP, NUP214-bound, free and ADP-bound states) with ATPase/RNA-binding biochemistry and mutagenesis","pmids":["19219046","19244245","19208808","19805289"],"confidence":"High","gaps":["How conformational switching is timed at the pore in vivo not resolved","Functional test of the Nup214/RNA competition model partly interpretive"]},{"year":2009,"claim":"Identified RBM15 as an mRNA-export factor that bridges DBP5 to mRNA, adding a substrate-loading partner to the export pathway.","evidence":"Co-IP, co-localization, RNA-IP and RNAi with mRNA export readout in human cells","pmids":["19786495"],"confidence":"Medium","gaps":["Direct versus indirect nature of DBP5-RBM15 contact not fully resolved","Single-lab data without reciprocal structural validation"]},{"year":2011,"claim":"Resolved the multi-step nucleotide cycle at the NPC, assigning ADP release and ATP re-loading roles to Nup159 and Gle1-IP6 respectively.","evidence":"In vitro nucleotide exchange reconstitution plus in vivo bypass/suppressor genetics and FRAP in yeast and human cells","pmids":["21576266","21576265"],"confidence":"High","gaps":["Precise ordering of cofactor engagement during export contested by later kinetics","How the rapid (<1 s) NPC residence maps onto remodeling unclear"]},{"year":2013,"claim":"Connected DBP5 to histone-mRNA translation machinery via a defined SLIP1-binding motif.","evidence":"Co-crystal structure of SLIP1 with the DBP5 SBM and pull-down assays","pmids":["23804756"],"confidence":"Medium","gaps":["Functional consequence of the DBP5-SLIP1 interaction not tested","In vivo relevance not established"]},{"year":2015,"claim":"Defined the rate-limiting kinetics of the intrinsic cycle, showing Pi release limits turnover and ADP binds more tightly than ATP.","evidence":"Stopped-flow and fluorescence-based Pi-release and equilibrium ATPase analysis","pmids":["26730886"],"confidence":"High","gaps":["How cofactors override the rate-limiting step addressed only later","Behavior on physiological mRNP substrates not measured"]},{"year":2015,"claim":"Uncovered an export-independent role in nuclear import of the SRF coactivator MKL1, demonstrating functional separation of RNA-binding from helicase and NPC-binding activities.","evidence":"RNAi, separation-of-function mutants, Co-IP, and nuclear import assays in mammalian cells","pmids":["25585691"],"confidence":"High","gaps":["Mechanism by which RNA binding alters MKL1 conformation not defined","Generality to other Importin-β cargoes unknown"]},{"year":2016,"claim":"Showed Dbp5 also exports pre-ribosomal subunits via an ATPase-independent, Gle1-independent mechanism distinct from mRNA export.","evidence":"Temperature-sensitive and ATPase-deficient dbp5 mutants, genetic interaction, and Co-IP with Nmd3 in yeast","pmids":["26872259"],"confidence":"Medium","gaps":["Molecular basis of the ATPase-independent activity unknown","Whether the human ortholog shares this role untested"]},{"year":2017,"claim":"Established a DNA-damage role: ATR/Chk1-triggered nuclear relocalization lets Dbp5 resolve R-loops, with phosphorylation disrupting its NUP214 anchor.","evidence":"Live-cell imaging, in vitro R-loop helicase assays, siRNA, phosphomimetic mutants, and DNA fiber assays","pmids":["28314779"],"confidence":"High","gaps":["Identity of the Chk1 phospho-site and full signaling cascade not exhaustively mapped","Genomic sites of R-loop resolution not defined"]},{"year":2017,"claim":"Mechanistically dissected the human DDX19 role in translation termination, placing its action at stop-codon recognition and ribosome complex stabilization.","evidence":"Reconstituted mammalian translation system with eRF1(AGQ), non-hydrolyzable GTP, and co-sedimentation","pmids":["28180304"],"confidence":"High","gaps":["In vivo contribution to termination in human cells not quantified","Relationship to its export role unclear"]},{"year":2017,"claim":"Integrated Nup42 into the activation module, defining a trimeric Nup42-Gle1-Dbp5 complex required for efficient export.","evidence":"In vitro ATPase reconstitution, trimeric pull-down, and mRNA export assays in yeast and human cells","pmids":["28869701"],"confidence":"High","gaps":["Spatial organization of the trimeric complex on the fibril not resolved","Dynamics of assembly during the cycle unknown"]},{"year":2018,"claim":"Revised the Nup159/Gle1 nucleotide-cycle model, arguing Gle1 slows ADP release and Nup159 promotes Gle1 release rather than acting as a nucleotide exchange factor.","evidence":"Solution-based in vitro kinetic and equilibrium binding assays","pmids":["29782832"],"confidence":"Medium","gaps":["Contradicts the prior 2011 ADP-release model and not independently replicated","In vivo validation of the revised mechanism lacking"]},{"year":2019,"claim":"Identified an unexpected innate-immune role, with DDX19 dampening type I interferon by disrupting TBK1/IKKε–IRF3 signaling and driving kinase degradation.","evidence":"Co-IP, ectopic expression/knockdown, TALEN Ddx19 knockout mice, and viral infection assays","pmids":["30699353"],"confidence":"Medium","gaps":["Whether this requires catalytic activity or is independent of RNA processing unclear","Single-lab finding; mechanism of Lamtor2 recruitment incompletely defined"]},{"year":2019,"claim":"Revealed an Xpo1-dependent NES enabling Dbp5 shuttling that is dispensable for mRNA export but required for tRNA export.","evidence":"Alanine-scanning mutagenesis, GFP-Dbp5 reporter, and tRNA/mRNA export assays in yeast","pmids":["31453808"],"confidence":"Medium","gaps":["Mechanistic role of shuttling in tRNA handling not defined","Conservation in human cells untested"]},{"year":2021,"claim":"Defined a perinuclear translation-control function in which DDX19B sequesters CTIF and hands it to CBP80 to spatially restrict CBC-dependent translation.","evidence":"Co-IP, proximity ligation, translation and NMD reporter assays, and dominant-negative mutants in human cells","pmids":["34232997"],"confidence":"Medium","gaps":["How DDX19B coordinates CTIF handover with export timing unresolved","Single-lab study without structural detail"]},{"year":2022,"claim":"Quantitatively explained Gle1 activation through thermodynamic coupling to ATP binding and acceleration of the rate-limiting Pi-release step.","evidence":"In vitro kinetic and equilibrium ATPase cycle analysis with stopped-flow kinetics","pmids":["35286399"],"confidence":"High","gaps":["Integration with Nup159/Nup42 effects in a full cycle not reconstituted","Cooperativity with InsP6 quantified only partially"]},{"year":2022,"claim":"Showed SUMOylation at K26 is a regulatory layer that enhances Gle1 interaction and supports mRNA export.","evidence":"In vivo SUMOylation assays, K26R mutagenesis, Co-IP, and mRNA export rescue in human cells","pmids":["35080244"],"confidence":"Medium","gaps":["SUMO ligase and stimulus controlling K26 modification unknown","Structural effect on the Gle1 interface undefined"]},{"year":2024,"claim":"Established a Los1-parallel tRNA export pathway in which tRNA synergizes with Gle1 to activate Dbp5, requiring a functional ATPase cycle and Gle1 binding.","evidence":"Genetic epistasis with los1/msn5, in vivo co-IP with tRNA, and in vitro 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Rather than unwinding RNA duplexes, DDX19B functions as a remodeler of ribonucleoprotein particles, whereby proteins bound to nuclear mRNA are dissociated and replaced by cytoplasmic mRNA binding proteins (PubMed:10428971)","subcellular_location":"Cytoplasm; Nucleus, nucleoplasm","url":"https://www.uniprot.org/uniprotkb/Q9UMR2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DDX19B","classification":"Not Classified","n_dependent_lines":45,"n_total_lines":1208,"dependency_fraction":0.037251655629139076},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DDX19B","total_profiled":1310},"omim":[{"mim_id":"621395","title":"DEAD-BOX HELICASE 19A; DDX19A","url":"https://www.omim.org/entry/621395"},{"mim_id":"605812","title":"DEAD-BOX HELICASE 19B; DDX19B","url":"https://www.omim.org/entry/605812"},{"mim_id":"602666","title":"MYOSIN XVA; MYO15A","url":"https://www.omim.org/entry/602666"},{"mim_id":"600316","title":"DEAFNESS, AUTOSOMAL RECESSIVE 3; DFNB3","url":"https://www.omim.org/entry/600316"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Nucleoplasm","reliability":"Uncertain"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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A dominant-negative DEAD-box (Glu→Gln) mutant of hDbp5 injected into Xenopus oocytes inhibits mRNA nuclear export.\",\n      \"method\": \"Immunoelectron microscopy, direct protein interaction assays, conditional yeast depletion strain, Xenopus oocyte microinjection with dominant-negative mutant\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (immunoEM, direct binding, in vivo depletion, functional dominant-negative in oocytes), findings replicated across yeast and human systems\",\n      \"pmids\": [\"10428971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The N-terminal domain of Nup159 (yeast) forms a seven-bladed beta-propeller that directly tethers Dbp5 to the cytoplasmic face of the NPC; structure-guided mutations in a conserved loop abolish in vitro Dbp5 binding, cause Dbp5 mislocalization in vivo, and block mRNA export.\",\n      \"method\": \"X-ray crystallography (2.5 Å), structure-based mutagenesis, in vitro binding assay, in vivo localization and mRNA export assays in yeast\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with mutagenesis and functional in vivo validation, multiple orthogonal methods\",\n      \"pmids\": [\"15574330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Gle1 and inositol hexakisphosphate (InsP6) together stimulate the RNA-dependent ATPase activity of Dbp5 at the nuclear pore; InsP6 increases Dbp5 ATPase activity in a Gle1-dependent manner, lowers the effective RNA concentration for half-maximal ATPase activity, and maximal InsP6 binding requires both Dbp5 and Gle1. Overexpression of DBP5 suppresses mRNA export defects of an ipk1 nup42 mutant defective in InsP6 production.\",\n      \"method\": \"In vitro kinetic ATPase assays, genetic epistasis/suppression in yeast, in vitro binding assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro biochemical reconstitution with kinetics, confirmed by independent genetic suppression, replicated in a parallel study (PMID:16783364)\",\n      \"pmids\": [\"16783363\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Gle1 is a direct cellular activator of Dbp5; Dbp5 alone cannot stably bind RNA or effectively hydrolyze ATP under physiological conditions, but Gle1 dramatically stimulates both activities. InsP6 binds directly to Gle1 and potentiates Gle1-mediated stimulation of Dbp5. A gle1 point mutant deficient for Dbp5 stimulation in vitro displays mRNA export defects in vivo; dominant mutations in DBP5 and GLE1 that rescue InsP6-deficient phenotypes mimic InsP6 effects in vitro.\",\n      \"method\": \"In vitro ATPase and RNA-binding assays, direct binding assays, in vivo mRNA export assays in yeast, structure-guided mutagenesis\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal in vitro and in vivo methods, corroborated by independent concurrent study (PMID:16783363)\",\n      \"pmids\": [\"16783364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Dbp5 functions as an mRNP remodeling protein by displacing the RNA-binding protein Nab2 from RNA; the ADP-bound form of Dbp5 (not ATP hydrolysis per se) is required for this RNP remodeling activity. In vivo, nab2 and dbp5 mutant analyses confirm that Nab2-bound mRNP is a physiological Dbp5 target at the NPC.\",\n      \"method\": \"In vitro RNP remodeling/displacement assay, nucleotide-state biochemistry, in vivo genetic analysis of nab2/dbp5 double mutants in yeast\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro reconstituted remodeling assay plus in vivo genetic validation, multiple orthogonal approaches\",\n      \"pmids\": [\"18082609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Dbp5 participates in translation termination in yeast: it physically interacts with release factor eRF1, genetically interacts with both eRF1 and eRF3 and poly(A)-binding protein Pab1, its helicase activity is required for efficient stop-codon recognition, and intact Dbp5 is essential for recruitment of eRF3 into termination complexes.\",\n      \"method\": \"Co-immunoprecipitation (physical interaction with eRF1), genetic interaction analysis, in vivo translation termination assays, dbp5 helicase mutant analysis in yeast\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal genetic and physical interaction data, functional helicase mutant analysis, multiple orthogonal in vivo approaches\",\n      \"pmids\": [\"17272721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Crystal structures of human DBP5 bound to RNA+AMPPNP and bound to the cytoplasmic nucleoporin NUP214 reveal that RNA binding and NUP214 binding are mutually exclusive. NUP214 decreases both RNA-binding and ATPase activities of DBP5 in vitro; the interaction is mediated by conserved residues.\",\n      \"method\": \"X-ray crystallography (two structures), in vitro ATPase assays, in vitro RNA-binding assays, mutagenesis\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structures combined with in vitro biochemical validation and mutagenesis\",\n      \"pmids\": [\"19219046\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"X-ray crystallography of human DDX19 in RNA-bound (closed cleft) and free (open cleft, posthydrolysis) states reveals an N-terminal alpha-helix that inserts between the conserved RecA-like domains of the free protein to negatively autoregulate ATPase activity; biochemical assays confirm the autoregulatory function of the N-terminal region.\",\n      \"method\": \"X-ray crystallography (two conformational states), in vitro ATPase biochemical assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structures in two states validated by biochemical analysis, single study but with two orthogonal methods\",\n      \"pmids\": [\"19244245\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Crystal structure of the Nup214 N-terminal domain in complex with DDX19 in its ADP-bound state reveals that the helicase interaction surface carries a positive charge and the Nup214 surface a negative charge; this structural framework suggests a basis for competitive displacement of Nup214 by RNA during mRNP remodeling.\",\n      \"method\": \"X-ray crystallography (2.5 Å co-crystal structure)\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — high-quality crystal structure but functional validation is largely interpretive rather than experimentally tested within this paper\",\n      \"pmids\": [\"19208808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Crystal structure of the C-terminal domain of Dbp5 at 1.8 Å reveals a RecA-like fold with a unique C-terminal alpha-helix and a distinctive loop; structure-guided mutagenesis of charged surface residues identifies specific residues required for Gle1 binding and Gle1-stimulated ATPase activity, and the same mutations block yeast growth, establishing a threshold level of Dbp5 ATPase activity required for mRNA export.\",\n      \"method\": \"X-ray crystallography (1.8 Å), structure-based mutagenesis, in vitro ATPase assays, in vivo yeast growth and mRNA export assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus mutagenesis with both in vitro biochemical and in vivo functional correlation\",\n      \"pmids\": [\"19805289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The nuclear export factor RBM15 binds specifically to human DBP5 and facilitates direct DBP5 contact with mRNA in vivo; RBM15 co-localizes with DBP5 and NXF1 at the nuclear envelope. Gene silencing of RBM15 causes cytoplasmic depletion and nuclear accumulation of mRNA, indicating RBM15 is required for efficient mRNA export.\",\n      \"method\": \"Co-immunoprecipitation, co-localization by microscopy, RNA immunoprecipitation, RNAi knockdown with mRNA export readout\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP and co-localization with functional knockdown validation, single lab but multiple methods\",\n      \"pmids\": [\"19786495\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Nup159 is specifically required for ADP release from Dbp5; Gle1-IP6 stimulates ATP binding to Dbp5 (priming it for RNA loading); in vivo, a dbp5 mutant with reduced ADP binding (R256D/R259D) bypasses the need for Nup159 interaction. This establishes Nup159 as an ADP release factor and Gle1-IP6 as a driver of ATP re-loading, defining a multi-step nucleotide cycle for Dbp5 at the NPC.\",\n      \"method\": \"In vitro nucleotide exchange/release assays (reconstitution), in vivo suppressor/bypass genetics in yeast, mRNA export assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro biochemical reconstitution of nucleotide exchange steps corroborated by genetic suppressor analysis in vivo\",\n      \"pmids\": [\"21576266\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"ATP binding and hydrolysis are required for efficient Dbp5 association with NPCs. RNA-binding-deficient Dbp5 mutants act as dominant negatives for mRNA export in both yeast and human cells by competing with wild-type Dbp5 for Gle1 at NPCs; the Dbp5-Gle1 interaction is rate-limiting for export and can occur independently of Nup159. FRAP shows Dbp5 associates with NPCs very dynamically (<1 s).\",\n      \"method\": \"Mutagenesis (ATP binding, hydrolysis, RNA-binding mutations), dominant-negative analysis in yeast and human cells, FRAP at NPCs, in vivo mRNA export assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple mutant classes with in vivo functional readouts in two organisms, FRAP kinetics, complementing parallel study (PMID:21576266)\",\n      \"pmids\": [\"21576265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"A SLIP1-binding motif (SBM) in DBP5 mediates direct interaction with SLIP1 (a MIF4G-like translation factor); crystal structure (3.25 Å) of SLIP1 bound to the DBP5 SBM was determined and interaction confirmed by pull-down assays, linking DBP5 to the histone mRNA translation machinery.\",\n      \"method\": \"X-ray crystallography (3.25 Å co-crystal), pull-down assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — crystal structure with pull-down confirmation, but functional consequence of DBP5-SLIP1 interaction not directly tested in this study\",\n      \"pmids\": [\"23804756\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Dbp5 kinetics: Pi release is the rate-limiting step of the intrinsic Dbp5 ATPase cycle; RNA increases kcat and Pi release rate ~20-fold, though Pi release continues to limit steady-state cycling even with RNA. ADP binds an order of magnitude more tightly than ATP (KD ~0.4 mM vs KT ~4 mM).\",\n      \"method\": \"In vitro kinetic and equilibrium ATPase analysis (stopped-flow, fluorescence-based Pi release assays)\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — rigorous in vitro kinetic reconstitution with multiple biochemical measurements, single lab\",\n      \"pmids\": [\"26730886\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Ddx19 is required for nuclear import of the SRF coactivator MKL1; this function is separate from its mRNA export role. RNA-binding activity of Ddx19 is required for MKL1 nuclear import, whereas helicase activity and NPC-binding are dispensable. Ddx19 modulates the conformation of MKL1 to affect its interaction with Importin-β.\",\n      \"method\": \"RNAi knockdown, dominant-negative and mutant analysis (helicase-dead, RNA-binding, NPC-binding mutants), co-immunoprecipitation, nuclear import assays in mammalian cells\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple separation-of-function mutants tested in cells, Co-IP, functional nuclear import readout, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"25585691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Dbp5 is required for nuclear export of both pre-ribosomal subunits in yeast; however, unlike mRNA export, ATPase-deficient dbp5 mutants do not block ribosomal export, and gle1 mutants show no major ribosomal export defects. Dbp5 physically and genetically interacts with Nmd3 (a ribosomal transport factor). This establishes that Dbp5 uses a distinct, ATPase-independent mechanism for ribosomal subunit export.\",\n      \"method\": \"Temperature-sensitive dbp5 mutants in yeast (nuclear accumulation of pre-ribosomal subunits), genetic interaction analysis, co-immunoprecipitation with Nmd3, ATPase-deficient mutant analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and physical interaction data with specific mutant classes, single lab, multiple approaches\",\n      \"pmids\": [\"26872259\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Ddx19 transiently relocalizes from the nuclear pore to the nucleus upon DNA damage/replication stress in an ATR/Chk1-dependent manner; nuclear Ddx19 resolves R-loops in vitro via its helicase activity; Ddx19 depletion induces R-loop accumulation and DNA damage specifically in proliferating cells. A phosphorylation-mimetic mutation of a Chk1 target residue disrupts Ddx19 interaction with Nup214 and promotes nuclear relocalization.\",\n      \"method\": \"Live-cell imaging, immunofluorescence, in vitro helicase/R-loop resolution assay, siRNA knockdown, phosphomutant analysis, DNA fiber assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro helicase activity on R-loops confirmed, in vivo live-cell relocalization, ATR/Chk1 pathway epistasis, phosphomutant functional analysis, multiple orthogonal methods\",\n      \"pmids\": [\"28314779\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Human DDX19 participates in translation termination in vitro: it associates with translating ribosome fractions, binds pre-termination complexes in a nucleotide-dependent manner, increases efficiency of termination complex formation and peptide release by eukaryotic release factors, and stabilizes elongating ribosome complexes with eEF1 and eEF2. DDX19 activation of termination occurs at the stop codon recognition step.\",\n      \"method\": \"Reconstituted mammalian in vitro translation system, ribosome fractionation, eRF1(AGQ) mutant and non-hydrolyzable GTP analog to dissect termination steps, co-sedimentation assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstituted translation system with mechanistic dissection using multiple mutant tools, single lab\",\n      \"pmids\": [\"28180304\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The Nup42–Gle1 interaction is integral to Dbp5/DDX19B activation and efficient mRNA export; a trimeric Nup42-CTD/Gle1-CTD/Dbp5 complex forms in the presence of IP6. Deletion of NUP42 abrogates Gle1-Dbp5 interaction. Nup42-CTD and IP6 stimulate Gle1/hGle1B activation of Dbp5 and DDX19B in non-additive manners in vitro. Disruption of Nup42 or IP6 binding interfaces on Gle1/hGle1B causes defective mRNA export in both yeast and human cells.\",\n      \"method\": \"In vitro ATPase reconstitution assays, Co-IP/pull-down (trimeric complex), in vivo mRNA export assays in yeast and human cells, structure-function mutagenesis\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — biochemical reconstitution with human and yeast proteins, in vivo validation in two organisms, multiple methods\",\n      \"pmids\": [\"28869701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Nup159 does not accelerate ADP release from Dbp5 (contradicting a previous model); instead, Gle1 slows ADP release from Dbp5, independent of Mg2+. In the presence of Nup159, the Gle1-ADP-Dbp5 interaction is weakened ~18-fold, suggesting Nup159 promotes Gle1 release from Dbp5 rather than acting as a nucleotide exchange factor.\",\n      \"method\": \"Solution-based in vitro kinetic and equilibrium binding assays (fluorescence, stopped-flow), ADP/ATP release measurements\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — rigorous in vitro kinetic assays but findings contradict the prior Noble et al. model; single lab; not independently replicated\",\n      \"pmids\": [\"29782832\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DDX19 negatively regulates type I interferon production: DDX19 inhibits TBK1- and IKKε-mediated phosphorylation of IRF3 by disrupting the TBK1/IKKε–IRF3 interaction, recruits Lamtor2 to form a TBK1-IKKε-Lamtor2-DDX19-IRF3 complex, and promotes proteasomal degradation of TBK1 and IKKε. Ddx19 knockout mice show augmented type I IFN production and suppressed encephalomyocarditis virus replication.\",\n      \"method\": \"Ectopic expression/knockdown in cell lines, co-immunoprecipitation, TALEN-generated Ddx19 knockout mice, viral infection assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, KO mouse with in vivo phenotype, multiple cell-based assays, single lab\",\n      \"pmids\": [\"30699353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Dbp5 contains an N-terminal Xpo1-dependent nuclear export signal identified by alanine-scanning mutagenesis; disruption of this NES impairs nucleocytoplasmic shuttling. Dbp5 nuclear shuttling is not essential for mRNP export, but is required for tRNA export—dbp5 mutants with impaired shuttling exhibit tRNA export defects and altered tRNA dynamics during nutrient stress recovery.\",\n      \"method\": \"Alanine-scanning mutagenesis (456 viable mutants), GFP-Dbp5 reporter, in vivo tRNA and mRNA export assays, Xpo1 interaction assays in yeast\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic mutagenesis with separation-of-function alleles, functional export assays in vivo, single lab\",\n      \"pmids\": [\"31453808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"DDX19B tethers the CBC-dependent translation initiation factor CTIF to the perinuclear region in a translationally incompetent state; upon mRNA export, DDX19B hands CTIF over to CBP80, enabling CBC-dependent translation initiation specifically in the perinuclear region. Impairing the DDX19B-CTIF interaction causes uncontrolled translation throughout the cytosol and dysregulates nonsense-mediated mRNA decay.\",\n      \"method\": \"Co-immunoprecipitation, proximity ligation assay, translation reporter assays, NMD reporter assays, dominant-negative and deletion mutant analysis in human cells\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP plus functional translation and NMD assays, single lab, multiple methods\",\n      \"pmids\": [\"34232997\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Gle1 activates Dbp5 ATPase by two mechanisms: (1) thermodynamic coupling between Gle1 and ATP binding to Dbp5 (Gle1 binds Dbp5-ATP >100-fold more tightly than ADP-Dbp5, and Gle1 increases ATP equilibrium binding >150-fold by slowing ATP dissociation); (2) Gle1 accelerates the rate-limiting Pi release step ~20-fold. Pi release remains rate-limiting even in the presence of Gle1.\",\n      \"method\": \"In vitro kinetic and equilibrium ATPase cycle analysis (fluorescence-based assays, stopped-flow kinetics)\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — rigorous mechanistic in vitro kinetic analysis dissecting two distinct activation mechanisms, single lab with multiple biochemical approaches\",\n      \"pmids\": [\"35286399\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DDX19 is SUMOylated at lysine 26; this SUMO modification enhances DDX19 interaction with Gle1. A SUMOylation-defective K26R mutant of human DDX19B fails to fully rescue mRNA export defects caused by DDX19 depletion, demonstrating that SUMOylation modulates DDX19B function in mRNA export.\",\n      \"method\": \"In vivo SUMOylation assays, site-directed mutagenesis (K26R), co-immunoprecipitation, mRNA export rescue assays in human cells\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — covalent modification identified by mass spectrometry/mutagenesis with functional rescue assay, single lab\",\n      \"pmids\": [\"35080244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Dbp5 functions in tRNA export in yeast parallel to canonical export factor Los1; Dbp5 is recruited directly to tRNA independent of Los1, Msn5, or Mex67. Unlike with mRNA, tRNA (or dsRNA) alone does not activate Dbp5 ATPase activity, but tRNA acts synergistically with Gle1 to fully activate Dbp5. A functional ATPase cycle and Gle1 binding are both required for Dbp5-mediated tRNA export.\",\n      \"method\": \"Genetic epistasis (double mutants with los1, msn5), in vivo co-immunoprecipitation with tRNA, in vitro ATPase assays with tRNA ± Gle1, dominant-negative overexpression, tRNA export assays in yeast\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro biochemical reconstitution combined with genetic epistasis and in vivo co-IP, multiple orthogonal methods, peer-reviewed\",\n      \"pmids\": [\"38189406\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DDX19B (Dbp5) is a DEAD-box RNA-dependent ATPase that localizes to the cytoplasmic fibrils of the nuclear pore complex via direct interaction with NUP214 (Nup159 in yeast), where its ATPase activity is activated by a trimeric complex of Gle1, Nup42, and inositol hexakisphosphate (InsP6) to drive remodeling of mRNPs—displacing RNA-binding proteins such as Nab2 and NXF1 in an ADP-bound conformational switch—thereby ensuring unidirectional mRNA export; it also resolves nuclear R-loops in an ATR/Chk1-dependent manner upon DNA damage (requiring nuclear relocalization triggered by Chk1-mediated phosphorylation that disrupts its NUP214 interaction), participates in translation termination by delivering eRF1 to the ribosomal stop codon and stabilizing termination and elongation complexes, facilitates tRNA export through a Gle1-dependent ATPase mechanism, tethers the translation initiation factor CTIF to the perinuclear region to spatially restrict CBC-dependent translation, and negatively regulates innate immune signaling by disrupting TBK1/IKKε–IRF3 interactions and promoting TBK1/IKKε degradation, with its activity fine-tuned by SUMOylation at K26 (enhancing Gle1 interaction) and by an autoregulatory N-terminal alpha-helix that suppresses ATPase activity in the unengaged state.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DDX19B (Dbp5) is a DEAD-box RNA-dependent ATPase that drives the terminal, directional step of mRNA nuclear export at the cytoplasmic face of the nuclear pore complex [#0, #1]. It is tethered to the NPC through direct binding to the N-terminal beta-propeller of nucleoporin NUP214/Nup159, an interaction that is mutually exclusive with RNA binding and that lowers the enzyme's RNA-binding and ATPase activities, positioning the enzyme for cycles of engagement and release [#1, #6]. Its ATPase activity is allosterically controlled: Gle1, together with inositol hexakisphosphate (InsP6) and Nup42, forms an activating complex that promotes ATP loading, slows ADP release, and accelerates the rate-limiting Pi-release step, while an autoinhibitory N-terminal alpha-helix suppresses activity in the unengaged state [#2, #3, #7, #19, #24]. Through nucleotide-dependent conformational switching\\u2014with the ADP-bound state mediating remodeling\\u2014Dbp5 displaces mRNP-bound proteins such as Nab2 to impose directionality on export [#4, #11]. Beyond mRNA export, DDX19B has multiple distinct activities: it relocalizes to the nucleus upon ATR/Chk1 signaling to resolve R-loops during replication stress via its helicase activity, with Chk1-mediated phosphorylation disrupting its NUP214 anchor [#17]; it promotes translation termination by stabilizing pre-termination ribosomal complexes and enhancing release-factor function at stop-codon recognition [#5, #18]; it mediates Gle1-dependent tRNA export and pre-ribosomal subunit export through mechanisms distinct from mRNA export [#16, #22, #26]; it spatially restricts CBC-dependent translation by tethering the initiation factor CTIF at the perinuclear region [#23]; and it negatively regulates type I interferon signaling by disrupting TBK1/IKK\\u03b5\\u2013IRF3 interactions and promoting TBK1/IKK\\u03b5 degradation [#21]. Its export function is further tuned by SUMOylation at K26, which enhances Gle1 interaction [#25].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established where the enzyme acts and that its catalytic activity is essential for mRNA export, anchoring DDX19B to the NPC cytoplasmic fibrils.\",\n      \"evidence\": \"ImmunoEM, direct binding, conditional yeast depletion, and dominant-negative DEAD-box mutant in Xenopus oocytes\",\n      \"pmids\": [\"10428971\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of the NUP214/Nup159 interaction not yet resolved\", \"How ATPase activity couples to export directionality unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined the structural basis of NPC tethering, showing the Nup159 beta-propeller directly binds Dbp5 and that this anchoring is required for export.\",\n      \"evidence\": \"X-ray crystallography of the Nup159 N-terminal domain with structure-guided mutagenesis and yeast export assays\",\n      \"pmids\": [\"15574330\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve how anchoring relates to the catalytic cycle\", \"Activator requirements not addressed\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified the cofactors that switch Dbp5 from a weak intrinsic enzyme to an active one, establishing Gle1 and InsP6 as direct activators.\",\n      \"evidence\": \"In vitro kinetic ATPase and RNA-binding assays with genetic suppression in yeast (two concurrent studies)\",\n      \"pmids\": [\"16783363\", \"16783364\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and structural basis of the activation complex unresolved\", \"Role of Nup42 not yet incorporated\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Revealed the physiological output of the ATPase cycle\\u2014mRNP remodeling\\u2014and that the ADP-bound state, not hydrolysis per se, drives displacement of bound RNA-binding proteins.\",\n      \"evidence\": \"In vitro RNP displacement assays with nucleotide-state biochemistry plus nab2/dbp5 genetic analysis\",\n      \"pmids\": [\"18082609\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other mRNP proteins besides Nab2 are remodeled in vivo not fully mapped\", \"Mechanism converting remodeling into directionality not yet defined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Extended Dbp5 function beyond export into translation termination, linking it physically and genetically to release factors and stop-codon recognition.\",\n      \"evidence\": \"Co-IP with eRF1, genetic interaction analysis with eRF1/eRF3/Pab1, and helicase mutant termination assays in yeast\",\n      \"pmids\": [\"17272721\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular step at which Dbp5 acts in termination not yet defined\", \"Whether this requires NPC localization unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Provided the structural logic for mutually exclusive RNA versus NUP214 binding and for N-terminal autoinhibition, explaining how the enzyme alternates states during the cycle.\",\n      \"evidence\": \"Multiple X-ray structures (RNA/AMPPNP, NUP214-bound, free and ADP-bound states) with ATPase/RNA-binding biochemistry and mutagenesis\",\n      \"pmids\": [\"19219046\", \"19244245\", \"19208808\", \"19805289\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How conformational switching is timed at the pore in vivo not resolved\", \"Functional test of the Nup214/RNA competition model partly interpretive\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified RBM15 as an mRNA-export factor that bridges DBP5 to mRNA, adding a substrate-loading partner to the export pathway.\",\n      \"evidence\": \"Co-IP, co-localization, RNA-IP and RNAi with mRNA export readout in human cells\",\n      \"pmids\": [\"19786495\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect nature of DBP5-RBM15 contact not fully resolved\", \"Single-lab data without reciprocal structural validation\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Resolved the multi-step nucleotide cycle at the NPC, assigning ADP release and ATP re-loading roles to Nup159 and Gle1-IP6 respectively.\",\n      \"evidence\": \"In vitro nucleotide exchange reconstitution plus in vivo bypass/suppressor genetics and FRAP in yeast and human cells\",\n      \"pmids\": [\"21576266\", \"21576265\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise ordering of cofactor engagement during export contested by later kinetics\", \"How the rapid (<1 s) NPC residence maps onto remodeling unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Connected DBP5 to histone-mRNA translation machinery via a defined SLIP1-binding motif.\",\n      \"evidence\": \"Co-crystal structure of SLIP1 with the DBP5 SBM and pull-down assays\",\n      \"pmids\": [\"23804756\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of the DBP5-SLIP1 interaction not tested\", \"In vivo relevance not established\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined the rate-limiting kinetics of the intrinsic cycle, showing Pi release limits turnover and ADP binds more tightly than ATP.\",\n      \"evidence\": \"Stopped-flow and fluorescence-based Pi-release and equilibrium ATPase analysis\",\n      \"pmids\": [\"26730886\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How cofactors override the rate-limiting step addressed only later\", \"Behavior on physiological mRNP substrates not measured\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Uncovered an export-independent role in nuclear import of the SRF coactivator MKL1, demonstrating functional separation of RNA-binding from helicase and NPC-binding activities.\",\n      \"evidence\": \"RNAi, separation-of-function mutants, Co-IP, and nuclear import assays in mammalian cells\",\n      \"pmids\": [\"25585691\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which RNA binding alters MKL1 conformation not defined\", \"Generality to other Importin-\\u03b2 cargoes unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed Dbp5 also exports pre-ribosomal subunits via an ATPase-independent, Gle1-independent mechanism distinct from mRNA export.\",\n      \"evidence\": \"Temperature-sensitive and ATPase-deficient dbp5 mutants, genetic interaction, and Co-IP with Nmd3 in yeast\",\n      \"pmids\": [\"26872259\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of the ATPase-independent activity unknown\", \"Whether the human ortholog shares this role untested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established a DNA-damage role: ATR/Chk1-triggered nuclear relocalization lets Dbp5 resolve R-loops, with phosphorylation disrupting its NUP214 anchor.\",\n      \"evidence\": \"Live-cell imaging, in vitro R-loop helicase assays, siRNA, phosphomimetic mutants, and DNA fiber assays\",\n      \"pmids\": [\"28314779\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the Chk1 phospho-site and full signaling cascade not exhaustively mapped\", \"Genomic sites of R-loop resolution not defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Mechanistically dissected the human DDX19 role in translation termination, placing its action at stop-codon recognition and ribosome complex stabilization.\",\n      \"evidence\": \"Reconstituted mammalian translation system with eRF1(AGQ), non-hydrolyzable GTP, and co-sedimentation\",\n      \"pmids\": [\"28180304\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo contribution to termination in human cells not quantified\", \"Relationship to its export role unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Integrated Nup42 into the activation module, defining a trimeric Nup42-Gle1-Dbp5 complex required for efficient export.\",\n      \"evidence\": \"In vitro ATPase reconstitution, trimeric pull-down, and mRNA export assays in yeast and human cells\",\n      \"pmids\": [\"28869701\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Spatial organization of the trimeric complex on the fibril not resolved\", \"Dynamics of assembly during the cycle unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Revised the Nup159/Gle1 nucleotide-cycle model, arguing Gle1 slows ADP release and Nup159 promotes Gle1 release rather than acting as a nucleotide exchange factor.\",\n      \"evidence\": \"Solution-based in vitro kinetic and equilibrium binding assays\",\n      \"pmids\": [\"29782832\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Contradicts the prior 2011 ADP-release model and not independently replicated\", \"In vivo validation of the revised mechanism lacking\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified an unexpected innate-immune role, with DDX19 dampening type I interferon by disrupting TBK1/IKK\\u03b5\\u2013IRF3 signaling and driving kinase degradation.\",\n      \"evidence\": \"Co-IP, ectopic expression/knockdown, TALEN Ddx19 knockout mice, and viral infection assays\",\n      \"pmids\": [\"30699353\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether this requires catalytic activity or is independent of RNA processing unclear\", \"Single-lab finding; mechanism of Lamtor2 recruitment incompletely defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Revealed an Xpo1-dependent NES enabling Dbp5 shuttling that is dispensable for mRNA export but required for tRNA export.\",\n      \"evidence\": \"Alanine-scanning mutagenesis, GFP-Dbp5 reporter, and tRNA/mRNA export assays in yeast\",\n      \"pmids\": [\"31453808\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic role of shuttling in tRNA handling not defined\", \"Conservation in human cells untested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined a perinuclear translation-control function in which DDX19B sequesters CTIF and hands it to CBP80 to spatially restrict CBC-dependent translation.\",\n      \"evidence\": \"Co-IP, proximity ligation, translation and NMD reporter assays, and dominant-negative mutants in human cells\",\n      \"pmids\": [\"34232997\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How DDX19B coordinates CTIF handover with export timing unresolved\", \"Single-lab study without structural detail\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Quantitatively explained Gle1 activation through thermodynamic coupling to ATP binding and acceleration of the rate-limiting Pi-release step.\",\n      \"evidence\": \"In vitro kinetic and equilibrium ATPase cycle analysis with stopped-flow kinetics\",\n      \"pmids\": [\"35286399\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Integration with Nup159/Nup42 effects in a full cycle not reconstituted\", \"Cooperativity with InsP6 quantified only partially\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed SUMOylation at K26 is a regulatory layer that enhances Gle1 interaction and supports mRNA export.\",\n      \"evidence\": \"In vivo SUMOylation assays, K26R mutagenesis, Co-IP, and mRNA export rescue in human cells\",\n      \"pmids\": [\"35080244\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"SUMO ligase and stimulus controlling K26 modification unknown\", \"Structural effect on the Gle1 interface undefined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established a Los1-parallel tRNA export pathway in which tRNA synergizes with Gle1 to activate Dbp5, requiring a functional ATPase cycle and Gle1 binding.\",\n      \"evidence\": \"Genetic epistasis with los1/msn5, in vivo co-IP with tRNA, and in vitro ATPase assays \\u00b1 Gle1 in yeast\",\n      \"pmids\": [\"38189406\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Dbp5 selects tRNA substrates without canonical export factors unclear\", \"Whether the human ortholog performs the same role untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single enzyme integrates and switches among mRNA export, R-loop resolution, translation termination, tRNA/ribosomal export, perinuclear translation control, and innate-immune regulation remains unresolved.\",\n      \"evidence\": \"No single study reconciles the regulatory partitioning of DDX19B across its distinct functions\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Signals that route DDX19B between NPC and nuclear/cytosolic pools not unified\", \"Reconciliation of the competing Nup159/Gle1 nucleotide-cycle models pending\", \"Relative in vivo contribution of each function in human cells unquantified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [4, 6, 12, 15]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [2, 3, 11, 14, 24]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [17, 4]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [2, 17]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 18, 21]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005643\", \"supporting_discovery_ids\": [0, 1, 6]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 23]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [17]},\n      {\"term_id\": \"GO:0005635\", \"supporting_discovery_ids\": [0, 10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 4, 16, 26]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 1, 22]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [5, 18, 23]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [17]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [21]}\n    ],\n    \"complexes\": [\n      \"Nup42-Gle1-Dbp5 activation complex\",\n      \"TBK1-IKK\\u03b5-Lamtor2-DDX19-IRF3 complex\"\n    ],\n    \"partners\": [\n      \"NUP214\",\n      \"GLE1\",\n      \"NUP42\",\n      \"NAB2\",\n      \"RBM15\",\n      \"ERF1\",\n      \"CTIF\",\n      \"TBK1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":6,"faith_total":6,"faith_pct":100.0}}