{"gene":"NSFL1C","run_date":"2026-04-29T11:37:57","timeline":{"discoveries":[{"year":1997,"finding":"p47 (NSFL1C) was identified as the first accessory protein for p97-mediated membrane fusion. It forms a tight stoichiometric complex with p97 (one trimer of p47 per hexamer of p97) and is essential for p97-mediated regrowth of Golgi cisternae from mitotic Golgi fragments.","method":"Biochemical purification, co-immunoprecipitation, in vitro Golgi reassembly assay","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — original discovery paper with reciprocal binding, stoichiometry determination, and functional reconstitution assay; replicated by subsequent studies","pmids":["9214505"],"is_preprint":false},{"year":1998,"finding":"p47 binds directly to syntaxin 5 (t-SNARE) and mediates binding of p97 to syntaxin 5, playing an analogous role to alpha-SNAP in the NSF pathway. p47 and alpha-SNAP compete for syntaxin 5 binding, establishing syntaxin 5 as a common component of both NSF- and p97-mediated Golgi reassembly pathways.","method":"In vitro Golgi reassembly assay, biochemical binding competition assays, antibody inhibition","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — direct binding shown biochemically with functional inhibition; multiple orthogonal approaches in a single study","pmids":["9506515"],"is_preprint":false},{"year":2001,"finding":"The NMR solution structure of the p47 C-terminal domain revealed it adopts a UBX (ubiquitin regulatory X) domain with a ubiquitin fold (βββαββαβ topology) plus a 13-residue structured N-terminal extension. NMR chemical shift perturbation studies identified the p97-interaction surface on the UBX domain.","method":"NMR spectroscopy, chemical shift perturbation mapping","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 — high-resolution NMR structure with direct interaction surface mapping","pmids":["11478859"],"is_preprint":false},{"year":2002,"finding":"p47 binds ubiquitin conjugates directly via its UBA domain, preferentially binding mono- rather than polyubiquitin conjugates, and this binding requires p47 to be complexed with p97. The UBA domain of p47 is required for its function in mitotic Golgi reassembly.","method":"Pulldown assays, ubiquitin-binding domain mutagenesis, in vitro Golgi reassembly functional assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — direct binding demonstrated with mutagenesis and functional validation in reassembly assay","pmids":["12411482"],"is_preprint":false},{"year":2002,"finding":"VCIP135 (VCP/p97/p47 complex-interacting protein) was identified as a novel essential factor for p97/p47-mediated membrane fusion. It binds the p97/p47/syntaxin 5 complex and dissociates it via p97-catalyzed ATP hydrolysis. VCIP135 and p47 are both required for Golgi and ER assembly in living cells.","method":"Affinity chromatography, co-immunoprecipitation, in vitro Golgi/ER reassembly assay, microinjection in living cells","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — identification of novel binding partner with functional in vitro and in vivo validation; multiple orthogonal methods","pmids":["12473691"],"is_preprint":false},{"year":2003,"finding":"p47 localizes primarily to the nucleus during interphase but is phosphorylated on Serine-140 by Cdc2 kinase at mitosis. Phosphorylated p47 cannot bind Golgi membranes. Expression of non-phosphorylatable p47(S140A) prevented Golgi disassembly during mitosis, establishing that Cdc2-mediated p47 phosphorylation is required for mitotic Golgi disassembly.","method":"Immunofluorescence localization, in vitro Cdc2 kinase assay, phosphorylation-site mutagenesis, microinjection of p47(S140A), in vitro Golgi disassembly assay","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 — specific kinase identified, site-specific mutagenesis with functional rescue/loss, in vitro reconstitution","pmids":["12810701"],"is_preprint":false},{"year":2004,"finding":"p47 reassembly of Golgi cisternae after mitosis requires ubiquitin and the deubiquitinating activity of VCIP135, which reverses a ubiquitylation event that occurs during mitotic Golgi disassembly. This represents a cycle of ubiquitylation/deubiquitination regulating Golgi membrane dynamics and the first evidence of a proteasome-independent function of p97/Cdc48.","method":"In vitro Golgi reassembly assay, ubiquitin requirement experiments, VCIP135 DUB activity assays, proteasome inhibitor controls","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods establishing mechanistic requirement; independently extended by subsequent papers","pmids":["15037600"],"is_preprint":false},{"year":2004,"finding":"Crystal structure of p97 N-D1 domains complexed with p47 C-terminal UBX domain at 2.9 Å resolution revealed that the p47 UBX domain interacts with the p97 N domain via a conserved S3/S4 loop that inserts into a hydrophobic pocket between p97 N subdomains. Deletion or point mutation of this loop significantly reduces p97 binding.","method":"X-ray crystallography, site-directed mutagenesis, binding assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 — crystal structure at 2.9 Å with mutagenesis validation of binding interface","pmids":["14988733"],"is_preprint":false},{"year":2005,"finding":"p97/p47/VCIP135 mediates the second sequential membrane fusion step in cell cycle-dependent ER network reformation, acting after an initial NSF/α-γ-SNAP-mediated fusion. Both pathways involve the t-SNARE syntaxin 18.","method":"Semi-intact cell ER reformation assay, sequential inhibitor addition, dominant-negative protein microinjection","journal":"Genes to cells","confidence":"Medium","confidence_rationale":"Tier 2 — functional epistasis in reconstituted cell system establishing pathway order","pmids":["16164599"],"is_preprint":false},{"year":2005,"finding":"p47 (Shp1/Ubx1 in yeast) is a cofactor of Cdc48/p97 required for ER maintenance, and p47 phosphorylation by cdc2 kinase causes ER network disruption. p97/p47-mediated membrane fusion is necessary for maintaining the ER polygonal network structure, and mitotic phosphorylation of p47 at Ser-140 by cdc2 disrupts this activity.","method":"Semi-intact CHO cell ER disassembly/reassembly assay, immunodepletion, kinase inhibition, phosphorylation-site mutagenesis","journal":"Genes to cells","confidence":"High","confidence_rationale":"Tier 1-2 — specific kinase and phosphorylation site identified with functional consequences in reconstituted assay","pmids":["15773896"],"is_preprint":false},{"year":2006,"finding":"Cryo-EM structures (~20 Å) of the p97 hexamer in complex with a p47 trimer in two nucleotide states revealed that the p47 trimer adopts two distinct arrangements on top of p97 depending on nucleotide state. Combined with NMR and biophysical data, this indicated that ATP-dependent p97 N-domain motions lead to rearrangement of p47 domains, potentially driving disassembly of target protein complexes.","method":"Cryo-electron microscopy, NMR spectroscopy, biophysical measurements","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structures in two nucleotide states combined with NMR and biophysical validation","pmids":["16601695"],"is_preprint":false},{"year":2010,"finding":"In yeast, Cdc48 (p97 ortholog) and its cofactor Shp1/Ubx1 (p47 ortholog) are required for autophagosome biogenesis. Shp1 interacts with the ubiquitin-fold autophagy protein Atg8 via an FK motif within the N-terminal non-ubiquitin-like Atg8 domain, suggesting that during autophagosome formation Atg8 functionally substitutes ubiquitin in the Cdc48/Shp1 complex.","method":"Yeast genetic screens, co-immunoprecipitation, in vitro binding assays, autophagosome imaging","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis with direct binding; yeast ortholog data","pmids":["20855502"],"is_preprint":false},{"year":2015,"finding":"Phosphorylation of VCIP135 by Cdk1 at a single residue (S130) during early mitosis is sufficient to inactivate its deubiquitinase activity and inhibit p97/p47-mediated Golgi membrane fusion. Dephosphorylation of VCIP135 S130 at the end of mitosis restores deubiquitinase activity and enables Golgi reassembly, demonstrating that coordinated phosphorylation and ubiquitination regulate Golgi membrane dynamics through VCIP135 in the cell cycle.","method":"Cell cycle synchronization, phosphorylation-site mutagenesis, DUB activity assays, in vitro Golgi reassembly assay","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1-2 — specific kinase site identified with site-directed mutagenesis and functional in vitro reconstitution","pmids":["25904330"],"is_preprint":false},{"year":2018,"finding":"PINK1 physically interacts with VCP/p97 and its cofactor NSFL1C/p47, and promotes dendritic arborization in neurons via a PINK1-VCP-PKA-p47 signaling pathway. PINK1 binds and phosphorylates the catalytic subunit of PKA at T197 to activate PKA, which then phosphorylates p47 at a novel site (S176) to regulate dendritic complexity. Both VCP and p47 are necessary for PINK1's ability to increase dendritic complexity.","method":"Unbiased proteomics (PINK1 interactome), RNAi knockdown, co-immunoprecipitation, phosphorylation assays, kinase activity assays, neuronal morphology quantification","journal":"eNeuro","confidence":"Medium","confidence_rationale":"Tier 2 — proteomic identification of interaction followed by RNAi functional validation and phosphorylation site identification; single lab study","pmids":["30783609"],"is_preprint":false},{"year":2020,"finding":"Intrinsically disordered regions in p47 are critical for intra-p47 and p47-p97 interactions via two previously unidentified linear motifs. One motif, an SHP domain, regulates p47 binding to p97 in a nucleotide state-dependent manner. Structural ensembles of p47-p97 complexes in ADP- and ATP-bound states were developed using NMR and cryo-EM restraints, revealing different interaction modes in the two nucleotide states.","method":"NMR spectroscopy, cryo-electron microscopy, molecular dynamics simulations, biophysical measurements","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — NMR and cryo-EM structural data combined with molecular dynamics; identified novel regulatory motifs with direct structural evidence","pmids":["33028677"],"is_preprint":false},{"year":2022,"finding":"Two cryo-EM structures of human p97 in complex with p47 adaptor were determined. One is six-fold symmetric without bound substrate; the other adopts a helical conformation with substrate running in an extended conformation through the p97 hexamer pore, supporting a 'hand-over-hand' translocation mechanism where two substrate residues are translocated per two ATP hydrolysis events (one per AAA ring). Proteomics analysis revealed one p97 complex can bind multiple substrate adaptors and process substrates with multiple ubiquitin modification types.","method":"Cryo-electron microscopy (two conformational states), quantitative proteomics","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structures in two distinct conformational states with substrate-engaged structure defining mechanism","pmids":["35552390"],"is_preprint":false}],"current_model":"NSFL1C/p47 functions as a trimeric adaptor for the p97/VCP AAA-ATPase, forming a stoichiometric complex (one p47 trimer per p97 hexamer) that directs p97 to membrane fusion events including Golgi and ER reassembly after mitosis; p47 binds syntaxin 5 directly to recruit p97 to SNARE complexes, binds monoubiquitinated substrates via its UBA domain, and is regulated by Cdc2-mediated phosphorylation at S140 (which prevents Golgi membrane binding during mitosis) and by PKA-mediated phosphorylation at S176 (downstream of PINK1, regulating dendritic arborization); nucleotide-state-dependent conformational changes in the p97-p47 complex, driven by intrinsically disordered p47 motifs including an SHP domain, are proposed to drive substrate disassembly via a hand-over-hand translocation mechanism."},"narrative":{"teleology":[{"year":1997,"claim":"Identification of p47 as the first p97 cofactor established that p97-mediated Golgi reassembly requires a dedicated adaptor and defined the 1:1 trimer-to-hexamer stoichiometry of the complex.","evidence":"Biochemical purification and in vitro Golgi reassembly from mitotic fragments","pmids":["9214505"],"confidence":"High","gaps":["Mechanism by which the p47–p97 complex engages membranes was unknown","The identity of membrane-resident targets was not established"]},{"year":1998,"claim":"Demonstration that p47 directly binds syntaxin 5 and competes with α-SNAP revealed how p97 is recruited to SNARE complexes, establishing p97/p47 as a parallel pathway to NSF/SNAP for membrane fusion.","evidence":"Binding competition assays and antibody inhibition in Golgi reassembly","pmids":["9506515"],"confidence":"High","gaps":["Whether additional SNARE partners are involved was not resolved","The structural basis of the p47–syntaxin 5 interaction was not determined"]},{"year":2001,"claim":"Solution of the p47 UBX domain structure by NMR revealed a ubiquitin fold and mapped the p97-interaction surface, providing the first structural basis for adaptor–p97 recognition.","evidence":"NMR spectroscopy with chemical shift perturbation mapping","pmids":["11478859"],"confidence":"High","gaps":["No structure of the full p47–p97 complex was available","Role of domains outside the UBX fold was uncharacterized"]},{"year":2002,"claim":"Discovery that p47's UBA domain binds monoubiquitin conjugates and is required for Golgi reassembly connected p97/p47 membrane fusion to ubiquitin signaling in a proteasome-independent context.","evidence":"Pulldown assays with ubiquitin conjugates, UBA mutagenesis, and functional Golgi reassembly","pmids":["12411482"],"confidence":"High","gaps":["Identity of the monoubiquitinated Golgi substrate was not known","Whether polyubiquitin plays any role was unclear"]},{"year":2002,"claim":"Identification of VCIP135 as an essential co-factor that binds and dissociates the p97/p47/syntaxin 5 complex upon ATP hydrolysis completed the minimal machinery for p97/p47-mediated membrane fusion.","evidence":"Affinity chromatography, co-IP, in vitro and in vivo Golgi/ER reassembly","pmids":["12473691"],"confidence":"High","gaps":["The enzymatic activity responsible for complex dissociation (later shown to be DUB activity) was not yet defined"]},{"year":2003,"claim":"Demonstration that Cdc2 phosphorylates p47 at S140 to block Golgi membrane binding during mitosis revealed how cell-cycle kinases directly inactivate p97/p47-dependent fusion to allow Golgi disassembly.","evidence":"In vitro kinase assays, S140A non-phosphorylatable mutant microinjection, immunofluorescence","pmids":["12810701"],"confidence":"High","gaps":["Whether other kinases also regulate p47 was unknown","How p47 is dephosphorylated at mitotic exit was not addressed"]},{"year":2004,"claim":"Crystal structure of the p97 N-D1/p47 UBX complex at 2.9 Å defined the molecular interface — a conserved S3/S4 loop inserting into a hydrophobic pocket — and generalized the UBX-binding mechanism for p97 cofactors.","evidence":"X-ray crystallography with site-directed mutagenesis validation","pmids":["14988733"],"confidence":"High","gaps":["Structure captured only the UBX domain; the rest of p47's multi-domain architecture in complex was unresolved"]},{"year":2004,"claim":"Establishing that VCIP135 functions as a deubiquitinase whose activity is required for Golgi reassembly linked the ubiquitin cycle directly to p97/p47-driven membrane fusion in a proteasome-independent manner.","evidence":"DUB activity assays, ubiquitin requirement experiments, proteasome inhibitor controls in Golgi reassembly","pmids":["15037600"],"confidence":"High","gaps":["The identity of the ubiquitinated membrane substrate remained unknown","Whether this ubiquitin cycle operates at the ER was not tested"]},{"year":2005,"claim":"Demonstration that p97/p47/VCIP135 mediates a second sequential membrane fusion step in ER network reformation (after NSF/SNAP) established a defined ordering of the two AAA-ATPase pathways in organelle biogenesis.","evidence":"Semi-intact cell ER reformation assay with sequential inhibitor addition","pmids":["16164599","15773896"],"confidence":"Medium","gaps":["Whether the ordering is strict in all cell types was not tested","Direct visualization of sequential fusion events was lacking"]},{"year":2006,"claim":"Cryo-EM of p97–p47 in two nucleotide states revealed that the p47 trimer undergoes large-scale rearrangement coupled to p97 ATPase-driven N-domain motions, providing the first evidence for a conformational power stroke in substrate processing.","evidence":"Cryo-EM at ~20 Å combined with NMR and biophysical data","pmids":["16601695"],"confidence":"High","gaps":["Resolution was insufficient to define atomic movements","No substrate-engaged structure was available"]},{"year":2010,"claim":"Genetic and biochemical evidence in yeast showed that Cdc48/Shp1 (p97/p47 orthologs) are required for autophagosome biogenesis via direct Atg8 interaction, extending the functional repertoire of the p97/p47 complex beyond organelle membrane fusion.","evidence":"Yeast genetic screens, co-IP, in vitro binding, autophagosome imaging","pmids":["20855502"],"confidence":"Medium","gaps":["Whether mammalian p47 similarly participates in autophagy was not established","The membrane fusion step requiring Cdc48/Shp1 in autophagy was not defined"]},{"year":2015,"claim":"Identification of Cdk1-mediated phosphorylation of VCIP135 at S130 as the switch that inactivates its DUB activity during mitosis completed the regulatory logic: both p47 and VCIP135 are independently inactivated by Cdk1, ensuring coordinated Golgi disassembly.","evidence":"Cell cycle synchronization, S130 mutagenesis, DUB assays, Golgi reassembly reconstitution","pmids":["25904330"],"confidence":"High","gaps":["The phosphatase(s) responsible for VCIP135 dephosphorylation at mitotic exit were not identified"]},{"year":2018,"claim":"Discovery that PINK1 activates PKA to phosphorylate p47 at S176 and thereby promotes dendritic arborization revealed a neuronal signaling role for the p97/p47 complex independent of its canonical Golgi/ER functions.","evidence":"Unbiased PINK1 interactome proteomics, RNAi, co-IP, kinase assays, neuronal morphometry","pmids":["30783609"],"confidence":"Medium","gaps":["Downstream targets of phospho-S176-p47 in neurons were not identified","Whether this pathway is relevant to Parkinson's disease pathology was not tested","Independent replication by other groups is lacking"]},{"year":2020,"claim":"Identification of an SHP motif and other linear motifs within p47's intrinsically disordered regions as nucleotide-state-dependent regulators of p97 binding explained how disorder encodes allostery in the p97–p47 machine.","evidence":"NMR spectroscopy, cryo-EM, molecular dynamics simulations","pmids":["33028677"],"confidence":"High","gaps":["How these disordered motifs coordinate with substrate engagement was not resolved"]},{"year":2022,"claim":"Cryo-EM structures of human p97–p47 in both substrate-free and substrate-engaged states revealed a hand-over-hand translocation mechanism (two residues per two ATP hydrolysis events) and showed that a single p97 complex can bind multiple adaptor types simultaneously.","evidence":"Cryo-EM in two conformational states with quantitative proteomics","pmids":["35552390"],"confidence":"High","gaps":["The identity of the endogenous translocated substrate in the Golgi reassembly context remains unknown","How adaptor multiplicity is coordinated on a single hexamer is unclear"]},{"year":null,"claim":"The identity of the monoubiquitinated Golgi membrane substrate(s) processed by the p97/p47/VCIP135 machinery remains unknown, and whether mammalian p47 participates in autophagosome biogenesis as its yeast ortholog does has not been established.","evidence":"","pmids":[],"confidence":"High","gaps":["No endogenous ubiquitinated substrate for Golgi reassembly has been identified","Mammalian p47 role in autophagy is unvalidated","Structural basis of p47–syntaxin 5 interaction is undetermined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,4,14]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[10,14,15]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0,1,5,6]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[4,8,9]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[5]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,3]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[5,9,12]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,1,4,6,8]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,1,6,8,9]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[11]}],"complexes":["p97/p47 complex","p97/p47/VCIP135 complex"],"partners":["VCP","STX5","VCIP135","PINK1"],"other_free_text":[]},"mechanistic_narrative":"NSFL1C (p47) is a trimeric adaptor that recruits the p97/VCP AAA-ATPase to membrane fusion events essential for postmitotic Golgi and ER reassembly, functioning analogously to α-SNAP in the NSF pathway by directly binding the t-SNARE syntaxin 5 to target p97 to SNARE complexes [PMID:9214505, PMID:9506515]. The p47 trimer engages the p97 hexamer via a C-terminal UBX domain that docks into a hydrophobic pocket of the p97 N domain, while its UBA domain binds monoubiquitinated substrates required for Golgi membrane dynamics, and intrinsically disordered regions including an SHP motif confer nucleotide-state-dependent conformational rearrangements that drive substrate disassembly through a hand-over-hand translocation mechanism [PMID:14988733, PMID:12411482, PMID:33028677, PMID:35552390]. Cell-cycle control of p47 activity is achieved by Cdc2/Cdk1-mediated phosphorylation at S140, which prevents Golgi membrane binding during mitosis, and by coordinated regulation of the associated deubiquitinase VCIP135, whose Cdk1-dependent inactivation blocks membrane fusion until mitotic exit [PMID:12810701, PMID:25904330]. Beyond organelle biogenesis, the p97–p47 complex participates in autophagosome formation (via Atg8 interaction of the yeast ortholog) and in PINK1-dependent dendritic arborization through PKA-mediated phosphorylation of p47 at S176 [PMID:20855502, PMID:30783609]."},"prefetch_data":{"uniprot":{"accession":"Q9UNZ2","full_name":"NSFL1 cofactor p47","aliases":["UBX domain-containing protein 2C","p97 cofactor p47"],"length_aa":370,"mass_kda":40.6,"function":"Reduces the ATPase activity of VCP (By similarity). Necessary for the fragmentation of Golgi stacks during mitosis and for VCP-mediated reassembly of Golgi stacks after mitosis (By similarity). May play a role in VCP-mediated formation of transitional endoplasmic reticulum (tER) (By similarity). Inhibits the activity of CTSL (in vitro) (PubMed:15498563). Together with UBXN2B/p37, regulates the centrosomal levels of kinase AURKA/Aurora A during mitotic progression by promoting AURKA removal from centrosomes in prophase (PubMed:23649807). Also, regulates spindle orientation during mitosis (PubMed:23649807)","subcellular_location":"Nucleus; Golgi apparatus, Golgi stack; Chromosome; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome","url":"https://www.uniprot.org/uniprotkb/Q9UNZ2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NSFL1C","classification":"Not Classified","n_dependent_lines":48,"n_total_lines":1208,"dependency_fraction":0.039735099337748346},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"VCP","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/NSFL1C","total_profiled":1310},"omim":[{"mim_id":"620965","title":"SMALL VCP-INTERACTING PROTEIN; SVIP","url":"https://www.omim.org/entry/620965"},{"mim_id":"611745","title":"VCP/p47 COMPLEX-INTERACTING PROTEIN 1;   VCPIP1","url":"https://www.omim.org/entry/611745"},{"mim_id":"610686","title":"UBX DOMAIN PROTEIN 2B; UBXN2B","url":"https://www.omim.org/entry/610686"},{"mim_id":"606610","title":"NSFL1 COFACTOR; NSFL1C","url":"https://www.omim.org/entry/606610"},{"mim_id":"601023","title":"VALOSIN-CONTAINING PROTEIN; VCP","url":"https://www.omim.org/entry/601023"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Plasma membrane","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NSFL1C"},"hgnc":{"alias_symbol":["dJ776F14.1","p47","UBXD10","UBX1","UBXN2C"],"prev_symbol":[]},"alphafold":{"accession":"Q9UNZ2","domains":[{"cath_id":"1.10.8.10","chopping":"1-46","consensus_level":"medium","plddt":84.8163,"start":1,"end":46},{"cath_id":"3.30.420.210","chopping":"113-131_178-246","consensus_level":"medium","plddt":80.6414,"start":113,"end":246},{"cath_id":"3.10.20.90","chopping":"272-368","consensus_level":"high","plddt":85.6239,"start":272,"end":368}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UNZ2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UNZ2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UNZ2-F1-predicted_aligned_error_v6.png","plddt_mean":74.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NSFL1C","jax_strain_url":"https://www.jax.org/strain/search?query=NSFL1C"},"sequence":{"accession":"Q9UNZ2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UNZ2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UNZ2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UNZ2"}},"corpus_meta":[{"pmid":"12364355","id":"PMC_12364355","title":"Role of p47(phox) in vascular oxidative stress and hypertension caused by angiotensin II.","date":"2002","source":"Hypertension (Dallas, Tex. : 1979)","url":"https://pubmed.ncbi.nlm.nih.gov/12364355","citation_count":457,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"16304607","id":"PMC_16304607","title":"Disruption of Toxoplasma gondii parasitophorous vacuoles by the mouse p47-resistance GTPases.","date":"2005","source":"PLoS pathogens","url":"https://pubmed.ncbi.nlm.nih.gov/16304607","citation_count":292,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"10391925","id":"PMC_10391925","title":"Stimulation of a vascular smooth muscle cell NAD(P)H oxidase by thrombin. 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observed in the absence of any one component, establishing p47-phox as an essential assembly factor.\",\n      \"method\": \"Cell-free reconstitution with purified recombinant proteins\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted in vitro with purified components, replicated across multiple labs\",\n      \"pmids\": [\"1512217\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Recombinant p47-phox produced in baculovirus restores deficient cytosol from CGD patient neutrophils to near-normal levels in a cell-free reconstitution system; p47-phox does not contain or bind FAD, indicating it is not the flavoprotein component.\",\n      \"method\": \"Cell-free reconstitution, baculovirus expression, FAD binding assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with purified recombinant protein\",\n      \"pmids\": [\"1918085\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Cell-free translocation of recombinant p47-phox to plasma membranes requires cytosol and an anionic amphiphile; GTP-γS and diacylglycerol enhance membrane association, indicating cytosolic factors and lipid signals regulate p47-phox membrane targeting.\",\n      \"method\": \"Cell-free translocation assay with radiolabeled recombinant p47-phox\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct translocation assay, single lab\",\n      \"pmids\": [\"1312346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Reconstitution of NADPH oxidase with purified recombinant p47-phox and p67-phox plus isolated plasma membrane shows NADPH Km of ~43 µM; neither recombinant factor contains a nucleotide binding site, placing the NADPH-binding component in the membrane.\",\n      \"method\": \"Cell-free reconstitution with recombinant baculovirus-expressed proteins\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — purified component reconstitution with kinetic analysis\",\n      \"pmids\": [\"1321612\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"p47-phox is identified as the 47 kDa cationic phosphoprotein that is phosphorylated during NADPH oxidase activation in normal but not p47-phox-deficient CGD cytosol; recombinant p47-phox is phosphorylated and augments superoxide generation in the cell-free system.\",\n      \"method\": \"Two-dimensional gel electrophoresis, immunoblot, cell-free activation assay with recombinant protein\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct biochemical identification with reconstitution\",\n      \"pmids\": [\"2265254\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"p47-phox interacts with cytochrome b558 (gp91-phox) at multiple sites identified by peptide phage display: the cytosolic loop region STRVRRQL (residues 86-93), C-terminal region EWFADLL (residues 451-457), and previously reported C-terminal tail; synthetic peptides inhibit NADPH oxidase activation with EC50 values in the µM range.\",\n      \"method\": \"Random-sequence peptide phage display library screening, synthetic peptide inhibition assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — phage display combined with functional peptide inhibition assay\",\n      \"pmids\": [\"7624379\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"p47-phox interacts with cytochrome b558 in an early stage of NADPH oxidase assembly independently of p21rac; preincubation of membrane with p47-phox alone forms a stable intermediate that protects from inhibition by the gp91-phox peptide RGVHFIF, whereas p21rac or p67-phox preincubation does not.\",\n      \"method\": \"Cell-free NADPH oxidase reconstitution, sequential preincubation with purified components, peptide inhibition\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cell-free reconstitution with defined purified components\",\n      \"pmids\": [\"8117710\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"A point mutation (Asp500Gly) in gp91-phox abolishes translocation of cytosolic p47-phox and p67-phox to the membrane in PMA-stimulated neutrophils and in a cell-free translocation assay; a synthetic peptide mimicking gp91-phox residues 491-504 inhibits NADPH oxidase activity and p47-phox/p67-phox translocation.\",\n      \"method\": \"Cell-free translocation assay, synthetic peptide inhibition, CGD patient cells\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — functional mutation combined with cell-free and cellular assays\",\n      \"pmids\": [\"8182143\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Stable transfection of p47-phox cDNA into p47-phox-deficient CGD B lymphoblasts restores superoxide generation and cytosolic p47-phox protein, establishing that p47-phox alone is sufficient to reconstitute the defect in these cells.\",\n      \"method\": \"Stable transfection, superoxide assay, immunoblot\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — genetic reconstitution with functional readout\",\n      \"pmids\": [\"7678602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"In the cell-free system, NADPH oxidase can be activated by p67-phox and Rac1 alone without p47-phox (turnover ~60 mol O2-/s/mol cyt b559), but maximal activity (~153) requires p47-phox; p47-phox facilitates/stabilizes the interaction of p67-phox and Rac1 with cytochrome b559.\",\n      \"method\": \"Cell-free reconstitution with purified recombinant components, systematic component omission\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — purified component reconstitution with quantitative kinetics\",\n      \"pmids\": [\"8939991\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Phosphorylation of p47-phox during NADPH oxidase activation involves PKC-dependent serine phosphorylation; lipid products of PI3K (PtdIns-3,4-P2 and PtdIns-3,4,5-P3) activate calcium-independent PKC isoforms that phosphorylate the p47 phosphoprotein (pleckstrin) in platelets.\",\n      \"method\": \"Wortmannin inhibition, permeabilized platelet phosphorylation assay with synthetic phosphoinositides\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological dissection with defined lipids in permeabilized cells\",\n      \"pmids\": [\"7493994\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"A PA-activated cytosolic protein kinase (~125 kDa) phosphorylates p47-phox on serine and tyrosine residues; this kinase is distinct from PKC, PAK, and MAPK isoforms and is sensitive to the same inhibitors that block NADPH oxidase activation.\",\n      \"method\": \"Chromatographic fractionation, in vitro kinase assay, phosphoamino acid analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — biochemical fractionation with in vitro kinase assay, single lab\",\n      \"pmids\": [\"9182594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Phosphorylation of p47(phox) at Ser-359 or Ser-370 is required to precede phosphorylation at other sites (Ser-303/304) and is necessary for membrane translocation and NADPH oxidase activity; aspartate/glutamate substitutions allow phosphorylation and translocation but do not support O2- production, indicating phosphoserine-specific features are required for activity.\",\n      \"method\": \"Site-directed mutagenesis, p47-phox-deficient B lymphoblast reconstitution, superoxide assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis with functional reconstitution in defined genetic background\",\n      \"pmids\": [\"9857051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Phosphorylation of serines in the p47(phox) C-terminus disrupts an intramolecular interaction between the SH3AB domains and the C-terminal arginine/lysine-rich region (residues 301-335), unmasking the SH3A domain and enabling binding to the p22(phox) proline-rich region to activate NADPH oxidase.\",\n      \"method\": \"Peptide binding assay, phosphomimetic mutagenesis (Asp substitutions), in vitro NADPH oxidase activity assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — biochemical mechanism defined with peptides, mutagenesis, and in vitro activity assay\",\n      \"pmids\": [\"10391914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Alpha-tocopherol inhibits p47(phox) membrane translocation and phosphorylation in human monocytes by inhibiting PKC activity, leading to impaired NADPH oxidase assembly and reduced superoxide production.\",\n      \"method\": \"Immunoprecipitation, phosphopeptide mapping, PKC activity assay, superoxide measurement\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in single lab study\",\n      \"pmids\": [\"9830025\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"GM-CSF primes neutrophil NADPH oxidase by inducing partial phosphorylation of p47(phox) on specific serines through a pathway involving protein-tyrosine kinase and PI3K but not PKC; this increases subsequent membrane translocation of p47(phox) and p67(phox) upon fMLP stimulation.\",\n      \"method\": \"2D phosphopeptide mapping, inhibitor studies, membrane fractionation, Western blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods, replicated across labs for priming mechanism\",\n      \"pmids\": [\"10400704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"p47(phox) and p40(phox) bind to moesin through their PX domains in a phosphoinositide-dependent manner; the N-terminal part of moesin (ERM family F-actin-binding protein) mediates this interaction.\",\n      \"method\": \"Co-immunoprecipitation, pull-down with purified proteins\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP and pulldown, single lab\",\n      \"pmids\": [\"11716484\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"NMR structure of the p47 C-terminal UBX domain reveals a ubiquitin fold; NMR chemical shift perturbation studies identify the p97-interacting surface on the UBX domain.\",\n      \"method\": \"NMR structure determination, chemical shift perturbation mapping\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR structure with functional surface mapping\",\n      \"pmids\": [\"11478859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The p47(phox) PX domain has two distinct phospholipid-binding pockets: one preferentially binding PtdIns(3,4)P2 and one binding anionic lipids such as phosphatidic acid; in full-length p47(phox), the C-terminal SH3 domain masks PX domain membrane binding via intramolecular interaction, which is released by phosphomimetic mutations.\",\n      \"method\": \"X-ray crystallography of PX domain, lipid binding assays, membrane binding measurements with full-length and mutant p47(phox)\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure combined with quantitative binding assays and mutagenesis\",\n      \"pmids\": [\"12356722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The p40-p47-p67(phox) cytosolic complex contains one copy of each protein in a heterotrimeric assembly with an extended non-globular shape; p67(phox) is the primary binding partner of p47(phox) within this resting complex and acts as the bridging molecule connecting p40(phox) and p47(phox).\",\n      \"method\": \"Gel filtration, isothermal titration calorimetry, protein-protein interaction mapping\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — ITC quantitative binding combined with structural characterization\",\n      \"pmids\": [\"11796733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"VCIP135 binds to the p97/p47/syntaxin5 complex and dissociates it via p97-catalyzed ATP hydrolysis; p47 is required for Golgi and ER assembly in living cells, functioning as an essential cofactor linking p97 to syntaxin5-mediated membrane fusion.\",\n      \"method\": \"Co-immunoprecipitation, in vitro membrane fusion assay, microinjection in live cells, siRNA knockdown with fluorescence microscopy\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods; replicated across labs\",\n      \"pmids\": [\"12473691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"TNF-α induces p47(phox) phosphorylation via p55 TNF receptor and a protein tyrosine kinase-dependent pathway on the same peptide phosphorylated by GM-CSF; this represents a common serine phosphorylation event in neutrophil priming by both cytokines.\",\n      \"method\": \"2D phosphopeptide mapping, neutralizing antibody studies, kinase inhibitor studies\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, replicated finding across cytokines\",\n      \"pmids\": [\"14530365\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"p47 is phosphorylated by Cdc2 kinase at Ser-140 during mitosis; phosphorylated p47 cannot bind Golgi membranes, and this phosphorylation is required for Golgi disassembly; microinjection of non-phosphorylatable p47(S140A) allows cells to maintain Golgi stacks during mitosis.\",\n      \"method\": \"In vitro Golgi disassembly assay, phosphorylation mapping, microinjection, fluorescence microscopy\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis with in vitro reconstitution and microinjection rescue experiments\",\n      \"pmids\": [\"12810701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Crystal structure of p97 ND1 domains complexed with the p47 UBX domain (2.9 Å) reveals that the p47 UBX S3/S4 loop inserts into a hydrophobic pocket in the p97 N domain; deletion or point mutations in this loop significantly reduce p97 binding, defining UBX domains as general p97/VCP binding modules.\",\n      \"method\": \"X-ray crystallography, deletion mutagenesis, binding assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with mutagenesis validation\",\n      \"pmids\": [\"14988733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"p47(phox) PX domain mediates translocation to the plasma membrane through association with the actin cytoskeleton via direct interaction with moesin, rather than through phospholipid binding.\",\n      \"method\": \"Domain deletion constructs, GFP-fusion localization, actin cytoskeleton disruption, co-immunoprecipitation\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — localization and Co-IP, single lab; conflicts with lipid-binding crystal structure data\",\n      \"pmids\": [\"15211576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"p97/p47-mediated reassembly of Golgi cisternae after mitosis requires ubiquitin but not proteasomal proteolysis; deubiquitinating activity of VCIP135 (a p97/p47 cofactor) reverses a ubiquitylation event occurring during mitotic disassembly, revealing a ubiquitylation/deubiquitylation cycle that regulates Golgi membrane dynamics.\",\n      \"method\": \"In vitro Golgi reassembly assay, ubiquitin requirement studies, proteasome inhibitors, VCIP135 DUB activity assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with specific enzymatic activities tested\",\n      \"pmids\": [\"15037600\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"p40(phox) promotes NADPH oxidase activation by increasing the affinity of p47(phox) for flavocytochrome b(558) approximately 3-fold in the cell-free activation system.\",\n      \"method\": \"Cell-free NADPH oxidase reconstitution with purified components, kinetic analysis\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — quantitative cell-free reconstitution\",\n      \"pmids\": [\"10861218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Direct interaction between actin (α- and β-) and p47(phox) is demonstrated; the C-terminal region of p47(phox) is required for this interaction; dissociation constant (Kd) for actin-p47(phox) interaction is ~0.45 µM by surface plasmon resonance.\",\n      \"method\": \"Far-Western blotting, deletion mutant analysis, surface plasmon resonance\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct binding with quantitative SPR measurement and domain mapping\",\n      \"pmids\": [\"11027608\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Eight functional domains in p47(phox) participate in NADPH oxidase activation as mapped by peptide walking; a single proline-rich domain (residues 357-371) mediates binding to p67(phox) in the absence and presence of amphiphile.\",\n      \"method\": \"Peptide walking with 95 overlapping pentadecapeptides, cell-free oxidase inhibition assay, ELISA-based p67-phox binding assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — systematic domain mapping with functional readout\",\n      \"pmids\": [\"9624128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Casein kinase 2 (CK2) phosphorylates p47(phox) in vitro at Ser-208, Ser-283 (within SH3 domains) and Ser-348 (C-terminal domain); phosphorylation is enhanced by arachidonic acid-induced conformational changes in p47(phox); CK2 inhibition potentiates fMLP-induced NADPH oxidase activity, suggesting CK2 phosphorylation deactivates the oxidase.\",\n      \"method\": \"In vitro kinase assay, CNBr mapping, phosphoamino acid analysis, CK2 inhibitor studies in HL-60 cells\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro kinase assay with site mapping and functional consequence\",\n      \"pmids\": [\"11535139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"PI3K regulates p47(phox) phosphorylation and NADPH oxidase activation by controlling DAG-dependent cPKC/PKCδ activity downstream of PLCγ2; Akt does not phosphorylate p47(phox) in vitro and Akt inhibition does not affect oxidase activity.\",\n      \"method\": \"PI3K/Akt inhibitors, in vitro kinase assay, PLCγ2 phosphorylation analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro kinase assay combined with pharmacological pathway dissection\",\n      \"pmids\": [\"15033459\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"p97/p47 mediates Golgi biogenesis via binding to the SNARE syntaxin5 through p47; p47 also functions in ER assembly, and cell cycle regulation involves phosphorylation-dephosphorylation and localization changes of p47.\",\n      \"method\": \"Review synthesizing biochemical reconstitution data; p47 ubiquitin-binding domain identified\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — synthesis of multiple primary reconstitution experiments; review paper\",\n      \"pmids\": [\"15749824\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"ER network reformation after mitotic disruption requires two sequential membrane fusion reactions: first NSF/α- and γ-SNAPs, then p97/p47/VCIP135; both processes involve the t-SNARE syntaxin18; p47 is specifically required for the second fusion step.\",\n      \"method\": \"Semi-intact cell ER reformation assay with depletion/add-back of specific factors, fluorescence microscopy\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution with defined factors in semi-intact cell system\",\n      \"pmids\": [\"16164599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"p47 (Shp1/Ubx1 in yeast) is required for ER network maintenance; phosphorylation of p47 by cdc2 kinase disrupts the ER network by preventing p97/p47-mediated membrane fusion.\",\n      \"method\": \"Semi-intact CHO cell ER disassembly/reassembly assay, cdc2 kinase phosphorylation, cytosol depletion\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution assay with specific kinase manipulation\",\n      \"pmids\": [\"15773896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Cryo-EM structures of p97 hexamer complexed with p47 trimer at ~20 Å in two nucleotide states reveal that the p47 trimer adopts two distinct arrangements on p97 depending on nucleotide state; NMR data combined with EM suggest ATP-dependent p97 N-domain motions rearrange p47 domains to enable target complex disassembly.\",\n      \"method\": \"Cryo-EM, NMR, biophysical measurements\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structural data from multiple orthogonal methods\",\n      \"pmids\": [\"16601695\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Small-angle X-ray scattering of full-length p47(phox) in solution reveals an extended, non-globular conformation in the autoinhibited resting state, contradicting a compact globular autoinhibition model; the PX domain and tandem SH3 domains are arranged in an extended organization.\",\n      \"method\": \"Small-angle X-ray scattering (SAXS)\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — structural method, single lab, no mutagenesis validation\",\n      \"pmids\": [\"16752909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In yeast, Cdc48/p97 and its cofactor Shp1/p47 are required for autophagosome biogenesis; Shp1 interacts with the ubiquitin-fold autophagy protein Atg8 through an FK motif in the non-ubiquitin-like N-terminal Atg8 domain, suggesting Atg8 functionally substitutes ubiquitin in this pathway.\",\n      \"method\": \"Genetic screen, Co-IP, in vitro binding, autophagosome biogenesis assay in yeast\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — yeast ortholog study with Co-IP and genetic evidence, single lab\",\n      \"pmids\": [\"20855502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Protein disulfide isomerase (PDI) associates with p47(phox) in a redox-dependent manner; oxidized PDI supports NADPH oxidase activity while reduced PDI down-regulates it; PDI-p47(phox) interaction in cytosol is thiol-mediated and increases upon PMA stimulation; arachidonate-dependent association of PDI and p47(phox) was demonstrated in vitro.\",\n      \"method\": \"Semi-recombinant cell-free assay, immunoprecipitation, co-localization, pulldown with purified proteins, PDI inhibitors\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods including in vitro pulldown and cell-free assay, single lab\",\n      \"pmids\": [\"21791598\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"p40(phox) acquires PI(3)P-binding capability through direct or indirect membrane targeting in a p47(phox)-dependent manner during FcγR-mediated phagocytosis; p40(phox) is essential when p47(phox) is only partially phosphorylated, but less critical when p47(phox) is adequately phosphorylated.\",\n      \"method\": \"Phosphorylation-mimicking mutants in HEK293/RAW264.7 cells, phagosome localization, PI binding assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple cell-based assays with defined mutants, single lab\",\n      \"pmids\": [\"21956105\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Phosphorylation of p47(phox) at distinct serine sites plays different roles in TNF-α signaling: S303-4 is crucial for acute superoxide production but is not required for membrane translocation or TRAF4 binding or ERK1/2 activation; S379 phosphorylation supports both superoxide production and ERK1/2 activation; p47(phox)-TRAF4 interaction mediates TNFα-induced VCAM-1 expression.\",\n      \"method\": \"Site-directed mutagenesis (11 serine-to-alanine mutants), Co-IP, siRNA knockdown, superoxide assay, Western blot\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — systematic mutagenesis with multiple orthogonal readouts\",\n      \"pmids\": [\"22460559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Park7/DJ-1 interacts with p47(phox) through its C-terminus to promote NADPH oxidase-dependent ROS production; Park7-deficient macrophages fail to produce ROS upon LPS/PMA stimulation, and this is rescued by restoration of Park7 expression.\",\n      \"method\": \"Co-IP, Park7 knockout mice, RNAi, rescue experiments, superoxide assay\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus genetic KO with rescue, single lab\",\n      \"pmids\": [\"26021615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Cell cycle regulation of VCIP135 deubiquitinase activity occurs via Cdk1 phosphorylation at S130 in early mitosis, which inactivates VCIP135 and inhibits p97/p47-mediated Golgi membrane fusion; dephosphorylation at mitosis exit restores DUB activity and Golgi reassembly.\",\n      \"method\": \"Site-directed mutagenesis, in vitro Golgi reassembly assay, DUB activity assay, cell cycle analysis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis with in vitro reconstitution of membrane fusion\",\n      \"pmids\": [\"25904330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"p47phox physically binds to Nrf2 and suppresses Nrf2 ubiquitination by Keap1 (while p47phox itself becomes ubiquitinated by Keap1), leading to increased Nrf2 nuclear translocation and expression of Nrf2-dependent antioxidant genes.\",\n      \"method\": \"Co-IP, ubiquitination assay, genetic ablation with gene expression analysis, luciferase reporter\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus ubiquitination assay and genetic KO, single lab\",\n      \"pmids\": [\"28939422\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PINK1 interacts with VCP/p97 and with the PKA holoenzyme; PINK1 phosphorylates the PKA catalytic subunit at T197 to activate PKA, which in turn phosphorylates NSFL1C/p47 at a novel site (S176); both VCP and p47 are required for PINK1-mediated dendritic arborization in neurons.\",\n      \"method\": \"Proteomic co-IP, RNAi knockdown, in vitro kinase assay, phospho-site identification, dendritic complexity analysis\",\n      \"journal\": \"eNeuro\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — unbiased proteomics, in vitro kinase assay, and genetic knockdown with functional readout\",\n      \"pmids\": [\"30783609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"An intrinsically disordered SHP motif in p47 regulates binding to p97 in a nucleotide-state-dependent manner; NMR and cryo-EM data combined with molecular dynamics define structural ensembles for p47-p97 in ADP- and ATP-bound states, revealing how disordered regions mediate intra-p47 and p47-p97 interactions.\",\n      \"method\": \"NMR, cryo-EM, analytical ultracentrifugation, molecular dynamics simulations\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR combined with cryo-EM and mutagenesis, multiple orthogonal structural methods\",\n      \"pmids\": [\"33028677\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cryo-EM structures of human p97 in complex with p47 reveal two conformations: a six-fold symmetric apo-like state and a helical active state with substrate in extended conformation running through the p97 pore, supporting a hand-over-hand translocation mechanism; one p97 complex can bind multiple substrate adaptors.\",\n      \"method\": \"Cryo-EM structure determination, proteomics analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution cryo-EM structures in multiple states with substrate\",\n      \"pmids\": [\"35552390\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The p47(phox) gene promoter requires PU.1 binding at a consensus site (-37 to -53) for transcriptional activity in myeloid cells; mutation of this PU.1 site abolishes promoter activity; PU.1 trans-activates the promoter in non-myeloid cells.\",\n      \"method\": \"Promoter-reporter transfection, DNase I footprinting, EMSA, site-directed mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — promoter mapping with mutagenesis and functional reporter assay\",\n      \"pmids\": [\"9211934\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"p67-phox and p47-phox mutually enhance each other's binding to the active NADPH oxidase complex; kinetic analysis shows p67-phox is dependent on p47-phox for membrane binding, and p67-phox reciprocally enhances p47-phox association.\",\n      \"method\": \"Semirecombinant cell-free activation system, steady-state kinetic analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — quantitative kinetic reconstitution with purified components\",\n      \"pmids\": [\"8071333\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NSFL1C/p47 is a multifunctional adaptor protein that, in the context of NADPH oxidase, acts as a phosphorylation-regulated scaffold: phosphorylation of key serines (particularly Ser-359/370 followed by Ser-303/304) relieves an autoinhibitory intramolecular interaction between its C-terminal arginine-rich region and tandem SH3 domains, unmasking the SH3A domain to bind p22(phox) and enabling translocation of the p40-p47-p67(phox) complex to the membrane for oxidase assembly; in the context of membrane remodeling, p47 acts as an essential cofactor for the p97/VCP AAA-ATPase—binding p97's N-domain via its UBX S3/S4 loop—to direct Golgi and ER reassembly after mitosis through a ubiquitylation/deubiquitylation cycle involving VCIP135, with cell-cycle control mediated by Cdc2-dependent phosphorylation of p47 at Ser-140; additionally, p47 is phosphorylated by PKA at Ser-176 downstream of a PINK1-VCP-PKA signaling axis to promote neuronal dendritic arborization.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI need to classify each paper as KEEP or EXCLUDE for NSFL1C (also known as p47, the VCP/p97 cofactor involved in membrane fusion and Golgi reassembly).\n\n**NSFL1C/p47 is**: The VCP/p97 AAA-ATPase adaptor protein involved in Golgi reassembly, ER membrane fusion, autophagosome biogenesis, and ubiquitin binding. Gene symbol NCF1 encodes a different protein (p47-phox, NADPH oxidase subunit).\n\n**ALIAS COLLISION**: The vast majority of the retrieved corpus (papers [1]-[100] from the main set) describes **p47-phox** (NCF1/NCF1 gene, NADPH oxidase cytosolic subunit) — a completely different protein from NSFL1C/p47. These must be EXCLUDED.\n\nPapers about NSFL1C (p47/VCP cofactor) to KEEP from the main corpus:\n- [10] VCIP135/p97/p47 membrane fusion — KEEP\n- [11] Crystal structure p97 ND1/p47 C-terminal domain — KEEP\n- [14] VCIP135 deubiquitinase in p97-p47 Golgi reassembly — KEEP\n- [20] Cdc48/p97 and Shp1/p47 in autophagosome biogenesis — KEEP (yeast ortholog)\n- [26] p97/p47-mediated biogenesis of Golgi and ER review — KEEP\n- [28] Localization and phosphorylation of p47 in Golgi disassembly-assembly — KEEP\n- [32] Conformational changes in p97-p47 adaptor complex — KEEP\n- [38] NMR solution structure of p47 C-terminal domain — KEEP\n- [65] NSF/SNAPs and p97/p47/VCIP135 sequential ER network reformation — KEEP\n- [69] PINK1 interacts with VCP/p97 and activates PKA to promote NSFL1C/p47 phosphorylation — KEEP\n- [78] Cell cycle regulation of VCIP135 deubiquitinase in p97/p47-mediated Golgi reassembly — KEEP\n- [81] Active conformation of p97-p47 unfoldase complex cryo-EM — KEEP\n- [90] p47 cofactor of p97, phosphorylation by cdc2 kinase regulates ER network — KEEP\n- [96] Intrinsically disordered motif regulates p47-p97 interaction — KEEP\n\nFrom the gene2pubmed set:\n- [19] p47 is a cofactor for p97-mediated membrane fusion (Kondo 1997) — KEEP\n- [21] Direct binding of ubiquitin conjugates by p47 and Ufd1-Npl4 — KEEP\n- [27] Syntaxin 5 common component of NSF- and p97-mediated reassembly — KEEP\n- [23] UBXD7 binds multiple ubiquitin ligases, p97 assembles with UBX proteins — KEEP (mentions NSFL1C context)\n\nPapers to EXCLUDE from main corpus: [1]-[9], [12]-[13], [15]-[18], [22]-[25], [27]-[31], [33]-[37], [39]-[68], [70]-[77], [79]-[80], [82]-[89], [91]-[95], [97]-[100] — all p47-phox (NCF1) papers, or unrelated p47 symbols (Plasmodium P47, sperm P47, ING1-ALT2, platelet pleckstrin, Xenopus cdc2 substrate, tick p47, eIF3 p47, IRG p47 GTPases).\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"p47 (NSFL1C) was identified as the first accessory protein for p97-mediated membrane fusion. It forms a tight stoichiometric complex with p97 (one trimer of p47 per hexamer of p97) and is essential for p97-mediated regrowth of Golgi cisternae from mitotic Golgi fragments.\",\n      \"method\": \"Biochemical purification, co-immunoprecipitation, in vitro Golgi reassembly assay\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — original discovery paper with reciprocal binding, stoichiometry determination, and functional reconstitution assay; replicated by subsequent studies\",\n      \"pmids\": [\"9214505\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"p47 binds directly to syntaxin 5 (t-SNARE) and mediates binding of p97 to syntaxin 5, playing an analogous role to alpha-SNAP in the NSF pathway. p47 and alpha-SNAP compete for syntaxin 5 binding, establishing syntaxin 5 as a common component of both NSF- and p97-mediated Golgi reassembly pathways.\",\n      \"method\": \"In vitro Golgi reassembly assay, biochemical binding competition assays, antibody inhibition\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct binding shown biochemically with functional inhibition; multiple orthogonal approaches in a single study\",\n      \"pmids\": [\"9506515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The NMR solution structure of the p47 C-terminal domain revealed it adopts a UBX (ubiquitin regulatory X) domain with a ubiquitin fold (βββαββαβ topology) plus a 13-residue structured N-terminal extension. NMR chemical shift perturbation studies identified the p97-interaction surface on the UBX domain.\",\n      \"method\": \"NMR spectroscopy, chemical shift perturbation mapping\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution NMR structure with direct interaction surface mapping\",\n      \"pmids\": [\"11478859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"p47 binds ubiquitin conjugates directly via its UBA domain, preferentially binding mono- rather than polyubiquitin conjugates, and this binding requires p47 to be complexed with p97. The UBA domain of p47 is required for its function in mitotic Golgi reassembly.\",\n      \"method\": \"Pulldown assays, ubiquitin-binding domain mutagenesis, in vitro Golgi reassembly functional assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct binding demonstrated with mutagenesis and functional validation in reassembly assay\",\n      \"pmids\": [\"12411482\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"VCIP135 (VCP/p97/p47 complex-interacting protein) was identified as a novel essential factor for p97/p47-mediated membrane fusion. It binds the p97/p47/syntaxin 5 complex and dissociates it via p97-catalyzed ATP hydrolysis. VCIP135 and p47 are both required for Golgi and ER assembly in living cells.\",\n      \"method\": \"Affinity chromatography, co-immunoprecipitation, in vitro Golgi/ER reassembly assay, microinjection in living cells\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — identification of novel binding partner with functional in vitro and in vivo validation; multiple orthogonal methods\",\n      \"pmids\": [\"12473691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"p47 localizes primarily to the nucleus during interphase but is phosphorylated on Serine-140 by Cdc2 kinase at mitosis. Phosphorylated p47 cannot bind Golgi membranes. Expression of non-phosphorylatable p47(S140A) prevented Golgi disassembly during mitosis, establishing that Cdc2-mediated p47 phosphorylation is required for mitotic Golgi disassembly.\",\n      \"method\": \"Immunofluorescence localization, in vitro Cdc2 kinase assay, phosphorylation-site mutagenesis, microinjection of p47(S140A), in vitro Golgi disassembly assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — specific kinase identified, site-specific mutagenesis with functional rescue/loss, in vitro reconstitution\",\n      \"pmids\": [\"12810701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"p47 reassembly of Golgi cisternae after mitosis requires ubiquitin and the deubiquitinating activity of VCIP135, which reverses a ubiquitylation event that occurs during mitotic Golgi disassembly. This represents a cycle of ubiquitylation/deubiquitination regulating Golgi membrane dynamics and the first evidence of a proteasome-independent function of p97/Cdc48.\",\n      \"method\": \"In vitro Golgi reassembly assay, ubiquitin requirement experiments, VCIP135 DUB activity assays, proteasome inhibitor controls\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods establishing mechanistic requirement; independently extended by subsequent papers\",\n      \"pmids\": [\"15037600\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Crystal structure of p97 N-D1 domains complexed with p47 C-terminal UBX domain at 2.9 Å resolution revealed that the p47 UBX domain interacts with the p97 N domain via a conserved S3/S4 loop that inserts into a hydrophobic pocket between p97 N subdomains. Deletion or point mutation of this loop significantly reduces p97 binding.\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis, binding assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure at 2.9 Å with mutagenesis validation of binding interface\",\n      \"pmids\": [\"14988733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"p97/p47/VCIP135 mediates the second sequential membrane fusion step in cell cycle-dependent ER network reformation, acting after an initial NSF/α-γ-SNAP-mediated fusion. Both pathways involve the t-SNARE syntaxin 18.\",\n      \"method\": \"Semi-intact cell ER reformation assay, sequential inhibitor addition, dominant-negative protein microinjection\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional epistasis in reconstituted cell system establishing pathway order\",\n      \"pmids\": [\"16164599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"p47 (Shp1/Ubx1 in yeast) is a cofactor of Cdc48/p97 required for ER maintenance, and p47 phosphorylation by cdc2 kinase causes ER network disruption. p97/p47-mediated membrane fusion is necessary for maintaining the ER polygonal network structure, and mitotic phosphorylation of p47 at Ser-140 by cdc2 disrupts this activity.\",\n      \"method\": \"Semi-intact CHO cell ER disassembly/reassembly assay, immunodepletion, kinase inhibition, phosphorylation-site mutagenesis\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — specific kinase and phosphorylation site identified with functional consequences in reconstituted assay\",\n      \"pmids\": [\"15773896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Cryo-EM structures (~20 Å) of the p97 hexamer in complex with a p47 trimer in two nucleotide states revealed that the p47 trimer adopts two distinct arrangements on top of p97 depending on nucleotide state. Combined with NMR and biophysical data, this indicated that ATP-dependent p97 N-domain motions lead to rearrangement of p47 domains, potentially driving disassembly of target protein complexes.\",\n      \"method\": \"Cryo-electron microscopy, NMR spectroscopy, biophysical measurements\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structures in two nucleotide states combined with NMR and biophysical validation\",\n      \"pmids\": [\"16601695\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In yeast, Cdc48 (p97 ortholog) and its cofactor Shp1/Ubx1 (p47 ortholog) are required for autophagosome biogenesis. Shp1 interacts with the ubiquitin-fold autophagy protein Atg8 via an FK motif within the N-terminal non-ubiquitin-like Atg8 domain, suggesting that during autophagosome formation Atg8 functionally substitutes ubiquitin in the Cdc48/Shp1 complex.\",\n      \"method\": \"Yeast genetic screens, co-immunoprecipitation, in vitro binding assays, autophagosome imaging\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with direct binding; yeast ortholog data\",\n      \"pmids\": [\"20855502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Phosphorylation of VCIP135 by Cdk1 at a single residue (S130) during early mitosis is sufficient to inactivate its deubiquitinase activity and inhibit p97/p47-mediated Golgi membrane fusion. Dephosphorylation of VCIP135 S130 at the end of mitosis restores deubiquitinase activity and enables Golgi reassembly, demonstrating that coordinated phosphorylation and ubiquitination regulate Golgi membrane dynamics through VCIP135 in the cell cycle.\",\n      \"method\": \"Cell cycle synchronization, phosphorylation-site mutagenesis, DUB activity assays, in vitro Golgi reassembly assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — specific kinase site identified with site-directed mutagenesis and functional in vitro reconstitution\",\n      \"pmids\": [\"25904330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PINK1 physically interacts with VCP/p97 and its cofactor NSFL1C/p47, and promotes dendritic arborization in neurons via a PINK1-VCP-PKA-p47 signaling pathway. PINK1 binds and phosphorylates the catalytic subunit of PKA at T197 to activate PKA, which then phosphorylates p47 at a novel site (S176) to regulate dendritic complexity. Both VCP and p47 are necessary for PINK1's ability to increase dendritic complexity.\",\n      \"method\": \"Unbiased proteomics (PINK1 interactome), RNAi knockdown, co-immunoprecipitation, phosphorylation assays, kinase activity assays, neuronal morphology quantification\",\n      \"journal\": \"eNeuro\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — proteomic identification of interaction followed by RNAi functional validation and phosphorylation site identification; single lab study\",\n      \"pmids\": [\"30783609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Intrinsically disordered regions in p47 are critical for intra-p47 and p47-p97 interactions via two previously unidentified linear motifs. One motif, an SHP domain, regulates p47 binding to p97 in a nucleotide state-dependent manner. Structural ensembles of p47-p97 complexes in ADP- and ATP-bound states were developed using NMR and cryo-EM restraints, revealing different interaction modes in the two nucleotide states.\",\n      \"method\": \"NMR spectroscopy, cryo-electron microscopy, molecular dynamics simulations, biophysical measurements\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR and cryo-EM structural data combined with molecular dynamics; identified novel regulatory motifs with direct structural evidence\",\n      \"pmids\": [\"33028677\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Two cryo-EM structures of human p97 in complex with p47 adaptor were determined. One is six-fold symmetric without bound substrate; the other adopts a helical conformation with substrate running in an extended conformation through the p97 hexamer pore, supporting a 'hand-over-hand' translocation mechanism where two substrate residues are translocated per two ATP hydrolysis events (one per AAA ring). Proteomics analysis revealed one p97 complex can bind multiple substrate adaptors and process substrates with multiple ubiquitin modification types.\",\n      \"method\": \"Cryo-electron microscopy (two conformational states), quantitative proteomics\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structures in two distinct conformational states with substrate-engaged structure defining mechanism\",\n      \"pmids\": [\"35552390\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NSFL1C/p47 functions as a trimeric adaptor for the p97/VCP AAA-ATPase, forming a stoichiometric complex (one p47 trimer per p97 hexamer) that directs p97 to membrane fusion events including Golgi and ER reassembly after mitosis; p47 binds syntaxin 5 directly to recruit p97 to SNARE complexes, binds monoubiquitinated substrates via its UBA domain, and is regulated by Cdc2-mediated phosphorylation at S140 (which prevents Golgi membrane binding during mitosis) and by PKA-mediated phosphorylation at S176 (downstream of PINK1, regulating dendritic arborization); nucleotide-state-dependent conformational changes in the p97-p47 complex, driven by intrinsically disordered p47 motifs including an SHP domain, are proposed to drive substrate disassembly via a hand-over-hand translocation mechanism.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"NSFL1C/p47 is a phosphorylation-regulated adaptor protein that functions in two major cellular contexts: as a scaffold for NADPH oxidase assembly in phagocytes and as an essential cofactor for the p97/VCP AAA-ATPase in post-mitotic organelle reassembly. In the NADPH oxidase pathway, p47(phox) exists in an autoinhibited state in which intramolecular interactions between its C-terminal arginine-rich region and tandem SH3 domains mask both the SH3A domain and the PX domain lipid-binding surface; sequential PKC-dependent phosphorylation at Ser-359/370 followed by Ser-303/304 relieves this autoinhibition, enabling p47(phox) to bind p22(phox) and translocate the p40–p47–p67(phox) heterotrimer to the membrane-bound cytochrome b558 for superoxide production [PMID:9857051, PMID:10391914, PMID:12356722, PMID:11796733]. In the p97/VCP pathway, p47 binds the p97 N-domain through its UBX domain S3/S4 loop, directing p97 to syntaxin-5- and syntaxin-18-containing SNARE complexes for Golgi and ER membrane fusion after mitosis via a ubiquitylation/deubiquitylation cycle involving VCIP135; Cdc2-mediated phosphorylation of p47 at Ser-140 during mitosis prevents membrane binding and is required for Golgi disassembly [PMID:14988733, PMID:12810701, PMID:15037600, PMID:16164599]. p47 is also phosphorylated by PKA at Ser-176 downstream of PINK1 signaling to promote neuronal dendritic arborization [PMID:30783609].\",\n  \"teleology\": [\n    {\n      \"year\": 1990,\n      \"claim\": \"Establishing that p47-phox is a phosphoprotein essential for NADPH oxidase activation resolved the identity of the 47 kDa component missing in autosomal-recessive CGD and showed that its phosphorylation accompanies oxidase activation.\",\n      \"evidence\": \"2D gel electrophoresis and cell-free reconstitution with recombinant p47-phox in normal vs. CGD cytosol\",\n      \"pmids\": [\"2265254\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphorylation sites not yet identified\", \"Mechanism by which phosphorylation activates p47 unknown\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Complete cell-free reconstitution with four purified recombinant components (p47-phox, p67-phox, Rac1, cytochrome b) demonstrated that p47-phox is one of the minimal required factors and acts as an assembly scaffold rather than a catalytic subunit.\",\n      \"evidence\": \"Cell-free reconstitution with purified recombinant proteins and systematic component omission\",\n      \"pmids\": [\"1512217\", \"1321612\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Domain architecture and binding interfaces not resolved\", \"Whether p47 contacts cytochrome b directly was unknown\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Genetic reconstitution proved that p47-phox is the sole gene product missing in p47-deficient CGD cells, establishing it as the causative factor.\",\n      \"evidence\": \"Stable transfection of p47-phox cDNA into CGD B lymphoblasts restored superoxide production\",\n      \"pmids\": [\"7678602\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of CGD mutations not mapped\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Identification of p47-phox binding sites on cytochrome b558 and demonstration that p47-phox is the first cytosolic factor to contact the membrane complex established the ordered assembly model of NADPH oxidase.\",\n      \"evidence\": \"Phage display, peptide inhibition, and sequential preincubation in cell-free reconstitution\",\n      \"pmids\": [\"7624379\", \"8117710\", \"8071333\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of SH3–cytochrome b interaction unknown\", \"Whether p47 contacts gp91 or p22phox preferentially was debated\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Mapping phosphorylation hierarchy and the autoinhibition mechanism revealed that Ser-359/370 phosphorylation must precede Ser-303/304 phosphorylation, and that this disrupts an intramolecular SH3–C-terminal interaction to unmask p22(phox) binding, solving how phosphorylation triggers oxidase assembly.\",\n      \"evidence\": \"Site-directed mutagenesis in CGD lymphoblast reconstitution, peptide binding assays, phosphomimetic mutations\",\n      \"pmids\": [\"9857051\", \"10391914\", \"9624128\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length autoinhibited structure not determined\", \"Identity of the kinase(s) phosphorylating Ser-359/370 in vivo not established\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"NMR structure of the p47 UBX domain revealed an ubiquitin fold and identified the p97-binding surface, establishing the structural basis for a second, independent function of p47 as a VCP/p97 cofactor distinct from its NADPH oxidase role.\",\n      \"evidence\": \"NMR structure determination with chemical shift perturbation mapping\",\n      \"pmids\": [\"11478859\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic-resolution structure of full p97–p47 complex not available\", \"How p47 discriminates between p97 functions not explained\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Crystal structure of the PX domain revealed dual lipid-binding pockets for PtdIns(3,4)P2 and phosphatidic acid, and showed that the C-terminal SH3 domain masks PX membrane binding in the resting state, unifying lipid targeting with the autoinhibition model.\",\n      \"evidence\": \"X-ray crystallography of PX domain combined with lipid binding assays and full-length phosphomimetic mutants\",\n      \"pmids\": [\"12356722\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contributions of lipid binding vs. cytoskeleton association in vivo debated\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Biochemical characterization of the p40–p47–p67(phox) resting complex as a 1:1:1 heterotrimer with p67 bridging p40 and p47 defined the quaternary organization of the cytosolic oxidase module.\",\n      \"evidence\": \"Gel filtration, isothermal titration calorimetry, and domain interaction mapping\",\n      \"pmids\": [\"11796733\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic structure of the intact heterotrimer not solved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstration that Cdc2-mediated phosphorylation of p47 at Ser-140 prevents Golgi membrane binding and is required for mitotic Golgi disassembly established the cell-cycle switch controlling p97/p47-dependent organelle dynamics.\",\n      \"evidence\": \"In vitro Golgi disassembly assay, microinjection of S140A mutant, fluorescence microscopy\",\n      \"pmids\": [\"12810701\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphatase responsible for Ser-140 dephosphorylation at mitotic exit not identified\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Crystal structure of the p97 ND1–p47 UBX complex defined the molecular interface (UBX S3/S4 loop into p97 N-domain hydrophobic pocket), establishing UBX domains as a general class of p97-binding modules.\",\n      \"evidence\": \"X-ray crystallography at 2.9 Å with deletion mutagenesis and binding assays\",\n      \"pmids\": [\"14988733\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length p47 in complex with hexameric p97 not structurally resolved at atomic resolution at this time\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstration that p97/p47-mediated Golgi reassembly requires ubiquitin but not proteasomal degradation, coupled with VCIP135 deubiquitinase activity, revealed a non-degradative ubiquitylation/deubiquitylation cycle governing membrane fusion.\",\n      \"evidence\": \"In vitro Golgi reassembly assay with ubiquitin depletion, proteasome inhibitors, and VCIP135 DUB activity assay\",\n      \"pmids\": [\"15037600\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the E3 ligase catalyzing the ubiquitylation event unknown\", \"Substrate of ubiquitylation not identified\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Establishing that ER network reformation requires sequential NSF-dependent and then p97/p47/VCIP135-dependent fusion steps involving syntaxin-18 placed p47 in a defined temporal order within the post-mitotic organelle reassembly pathway.\",\n      \"evidence\": \"Semi-intact cell ER reformation assay with factor depletion and add-back\",\n      \"pmids\": [\"16164599\", \"15773896\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How p47 is redirected between Golgi and ER substrates not clear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Discovery that PINK1 activates PKA to phosphorylate p47 at Ser-176, and that both VCP and p47 are required for PINK1-dependent dendritic arborization, extended p47 function to neuronal morphogenesis and linked it to Parkinson's disease-associated signaling.\",\n      \"evidence\": \"Proteomic co-IP, in vitro kinase assay with phospho-site identification, RNAi knockdown with dendritic complexity analysis in neurons\",\n      \"pmids\": [\"30783609\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream substrates of the VCP/p47 complex in dendrite formation unknown\", \"Whether Ser-176 phosphorylation affects p97 binding not tested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"High-resolution cryo-EM structures of p97–p47 in symmetric apo-like and helical substrate-engaged states provided the first visualization of substrate threading through the p97 pore with p47 bound, supporting a hand-over-hand translocation mechanism.\",\n      \"evidence\": \"Cryo-EM structure determination with proteomics analysis\",\n      \"pmids\": [\"35552390\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How p47 trimer coordinates with substrate threading mechanistically unresolved\", \"Structures with specific membrane fusion substrates (e.g., SNARE complexes) not yet captured\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The mechanism by which p47 switches between its NADPH oxidase scaffold function and its p97/VCP cofactor function remains undefined; the E3 ubiquitin ligase acting in the p97/p47 Golgi reassembly pathway has not been identified; and the full-length autoinhibited structure of p47(phox) in the trimeric cytosolic complex has not been solved at atomic resolution.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No mechanism for functional partitioning between NADPH oxidase and p97/VCP roles\", \"E3 ligase for Golgi reassembly ubiquitylation cycle unknown\", \"Atomic-resolution structure of autoinhibited full-length p47(phox) in the p40–p47–p67 trimer not available\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 9, 13, 19, 20]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [18]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [27]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [2, 7, 12, 18]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4, 19, 35]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [20, 22, 25]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [32, 33]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 1, 8, 9, 12, 13]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [22, 33, 41]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [20, 25, 32]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [20, 22, 25, 32, 33]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [36]}\n    ],\n    \"complexes\": [\n      \"p40-p47-p67(phox) heterotrimer\",\n      \"NADPH oxidase (NOX2 complex)\",\n      \"p97/p47 complex\",\n      \"p97/p47/VCIP135 complex\"\n    ],\n    \"partners\": [\n      \"VCP\",\n      \"NCF2\",\n      \"NCF4\",\n      \"CYBA\",\n      \"VCIP135\",\n      \"STX5\",\n      \"PARK7\",\n      \"PINK1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"NSFL1C (p47) is a trimeric adaptor that recruits the p97/VCP AAA-ATPase to membrane fusion events essential for postmitotic Golgi and ER reassembly, functioning analogously to α-SNAP in the NSF pathway by directly binding the t-SNARE syntaxin 5 to target p97 to SNARE complexes [PMID:9214505, PMID:9506515]. The p47 trimer engages the p97 hexamer via a C-terminal UBX domain that docks into a hydrophobic pocket of the p97 N domain, while its UBA domain binds monoubiquitinated substrates required for Golgi membrane dynamics, and intrinsically disordered regions including an SHP motif confer nucleotide-state-dependent conformational rearrangements that drive substrate disassembly through a hand-over-hand translocation mechanism [PMID:14988733, PMID:12411482, PMID:33028677, PMID:35552390]. Cell-cycle control of p47 activity is achieved by Cdc2/Cdk1-mediated phosphorylation at S140, which prevents Golgi membrane binding during mitosis, and by coordinated regulation of the associated deubiquitinase VCIP135, whose Cdk1-dependent inactivation blocks membrane fusion until mitotic exit [PMID:12810701, PMID:25904330]. Beyond organelle biogenesis, the p97–p47 complex participates in autophagosome formation (via Atg8 interaction of the yeast ortholog) and in PINK1-dependent dendritic arborization through PKA-mediated phosphorylation of p47 at S176 [PMID:20855502, PMID:30783609].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Identification of p47 as the first p97 cofactor established that p97-mediated Golgi reassembly requires a dedicated adaptor and defined the 1:1 trimer-to-hexamer stoichiometry of the complex.\",\n      \"evidence\": \"Biochemical purification and in vitro Golgi reassembly from mitotic fragments\",\n      \"pmids\": [\"9214505\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which the p47–p97 complex engages membranes was unknown\", \"The identity of membrane-resident targets was not established\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstration that p47 directly binds syntaxin 5 and competes with α-SNAP revealed how p97 is recruited to SNARE complexes, establishing p97/p47 as a parallel pathway to NSF/SNAP for membrane fusion.\",\n      \"evidence\": \"Binding competition assays and antibody inhibition in Golgi reassembly\",\n      \"pmids\": [\"9506515\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether additional SNARE partners are involved was not resolved\", \"The structural basis of the p47–syntaxin 5 interaction was not determined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Solution of the p47 UBX domain structure by NMR revealed a ubiquitin fold and mapped the p97-interaction surface, providing the first structural basis for adaptor–p97 recognition.\",\n      \"evidence\": \"NMR spectroscopy with chemical shift perturbation mapping\",\n      \"pmids\": [\"11478859\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of the full p47–p97 complex was available\", \"Role of domains outside the UBX fold was uncharacterized\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Discovery that p47's UBA domain binds monoubiquitin conjugates and is required for Golgi reassembly connected p97/p47 membrane fusion to ubiquitin signaling in a proteasome-independent context.\",\n      \"evidence\": \"Pulldown assays with ubiquitin conjugates, UBA mutagenesis, and functional Golgi reassembly\",\n      \"pmids\": [\"12411482\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the monoubiquitinated Golgi substrate was not known\", \"Whether polyubiquitin plays any role was unclear\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identification of VCIP135 as an essential co-factor that binds and dissociates the p97/p47/syntaxin 5 complex upon ATP hydrolysis completed the minimal machinery for p97/p47-mediated membrane fusion.\",\n      \"evidence\": \"Affinity chromatography, co-IP, in vitro and in vivo Golgi/ER reassembly\",\n      \"pmids\": [\"12473691\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The enzymatic activity responsible for complex dissociation (later shown to be DUB activity) was not yet defined\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstration that Cdc2 phosphorylates p47 at S140 to block Golgi membrane binding during mitosis revealed how cell-cycle kinases directly inactivate p97/p47-dependent fusion to allow Golgi disassembly.\",\n      \"evidence\": \"In vitro kinase assays, S140A non-phosphorylatable mutant microinjection, immunofluorescence\",\n      \"pmids\": [\"12810701\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other kinases also regulate p47 was unknown\", \"How p47 is dephosphorylated at mitotic exit was not addressed\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Crystal structure of the p97 N-D1/p47 UBX complex at 2.9 Å defined the molecular interface — a conserved S3/S4 loop inserting into a hydrophobic pocket — and generalized the UBX-binding mechanism for p97 cofactors.\",\n      \"evidence\": \"X-ray crystallography with site-directed mutagenesis validation\",\n      \"pmids\": [\"14988733\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure captured only the UBX domain; the rest of p47's multi-domain architecture in complex was unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Establishing that VCIP135 functions as a deubiquitinase whose activity is required for Golgi reassembly linked the ubiquitin cycle directly to p97/p47-driven membrane fusion in a proteasome-independent manner.\",\n      \"evidence\": \"DUB activity assays, ubiquitin requirement experiments, proteasome inhibitor controls in Golgi reassembly\",\n      \"pmids\": [\"15037600\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The identity of the ubiquitinated membrane substrate remained unknown\", \"Whether this ubiquitin cycle operates at the ER was not tested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstration that p97/p47/VCIP135 mediates a second sequential membrane fusion step in ER network reformation (after NSF/SNAP) established a defined ordering of the two AAA-ATPase pathways in organelle biogenesis.\",\n      \"evidence\": \"Semi-intact cell ER reformation assay with sequential inhibitor addition\",\n      \"pmids\": [\"16164599\", \"15773896\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the ordering is strict in all cell types was not tested\", \"Direct visualization of sequential fusion events was lacking\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Cryo-EM of p97–p47 in two nucleotide states revealed that the p47 trimer undergoes large-scale rearrangement coupled to p97 ATPase-driven N-domain motions, providing the first evidence for a conformational power stroke in substrate processing.\",\n      \"evidence\": \"Cryo-EM at ~20 Å combined with NMR and biophysical data\",\n      \"pmids\": [\"16601695\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Resolution was insufficient to define atomic movements\", \"No substrate-engaged structure was available\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Genetic and biochemical evidence in yeast showed that Cdc48/Shp1 (p97/p47 orthologs) are required for autophagosome biogenesis via direct Atg8 interaction, extending the functional repertoire of the p97/p47 complex beyond organelle membrane fusion.\",\n      \"evidence\": \"Yeast genetic screens, co-IP, in vitro binding, autophagosome imaging\",\n      \"pmids\": [\"20855502\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether mammalian p47 similarly participates in autophagy was not established\", \"The membrane fusion step requiring Cdc48/Shp1 in autophagy was not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identification of Cdk1-mediated phosphorylation of VCIP135 at S130 as the switch that inactivates its DUB activity during mitosis completed the regulatory logic: both p47 and VCIP135 are independently inactivated by Cdk1, ensuring coordinated Golgi disassembly.\",\n      \"evidence\": \"Cell cycle synchronization, S130 mutagenesis, DUB assays, Golgi reassembly reconstitution\",\n      \"pmids\": [\"25904330\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The phosphatase(s) responsible for VCIP135 dephosphorylation at mitotic exit were not identified\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Discovery that PINK1 activates PKA to phosphorylate p47 at S176 and thereby promotes dendritic arborization revealed a neuronal signaling role for the p97/p47 complex independent of its canonical Golgi/ER functions.\",\n      \"evidence\": \"Unbiased PINK1 interactome proteomics, RNAi, co-IP, kinase assays, neuronal morphometry\",\n      \"pmids\": [\"30783609\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Downstream targets of phospho-S176-p47 in neurons were not identified\", \"Whether this pathway is relevant to Parkinson's disease pathology was not tested\", \"Independent replication by other groups is lacking\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identification of an SHP motif and other linear motifs within p47's intrinsically disordered regions as nucleotide-state-dependent regulators of p97 binding explained how disorder encodes allostery in the p97–p47 machine.\",\n      \"evidence\": \"NMR spectroscopy, cryo-EM, molecular dynamics simulations\",\n      \"pmids\": [\"33028677\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How these disordered motifs coordinate with substrate engagement was not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Cryo-EM structures of human p97–p47 in both substrate-free and substrate-engaged states revealed a hand-over-hand translocation mechanism (two residues per two ATP hydrolysis events) and showed that a single p97 complex can bind multiple adaptor types simultaneously.\",\n      \"evidence\": \"Cryo-EM in two conformational states with quantitative proteomics\",\n      \"pmids\": [\"35552390\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The identity of the endogenous translocated substrate in the Golgi reassembly context remains unknown\", \"How adaptor multiplicity is coordinated on a single hexamer is unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The identity of the monoubiquitinated Golgi membrane substrate(s) processed by the p97/p47/VCIP135 machinery remains unknown, and whether mammalian p47 participates in autophagosome biogenesis as its yeast ortholog does has not been established.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No endogenous ubiquitinated substrate for Golgi reassembly has been identified\", \"Mammalian p47 role in autophagy is unvalidated\", \"Structural basis of p47–syntaxin 5 interaction is undetermined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 4, 14]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [10, 14, 15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0, 1, 5, 6]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [4, 8, 9]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [5, 9, 12]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 1, 4, 6, 8]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 1, 6, 8, 9]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"complexes\": [\n      \"p97/p47 complex\",\n      \"p97/p47/VCIP135 complex\"\n    ],\n    \"partners\": [\n      \"VCP\",\n      \"STX5\",\n      \"VCIP135\",\n      \"PINK1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}