{"gene":"PLAA","run_date":"2026-04-28T19:45:44","timeline":{"discoveries":[{"year":2009,"finding":"The C-terminal PUL domain of PLAA forms a 6-mer Armadillo-containing domain whose N-terminal extension folds back to create a positively charged ridge that binds the C-terminus of p97/VCP (specifically burying p97-Tyr805). Crystal structure of the PUL domain–p97 C-terminal peptide complex was solved at high resolution, and point mutations in the yeast ortholog Doa1 that disrupt this interface reduce ubiquitin levels and cause subset-specific growth phenotypes, demonstrating that the p97–PLAA physical interaction is functionally important for a subset of PLAA-dependent ubiquitin-pathway processes.","method":"X-ray crystallography of PUL–p97 complex; site-directed mutagenesis of Doa1 PUL domain; in vivo complementation in doa1Δ yeast","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — crystal structure plus mutagenesis with in vivo functional validation in a single study","pmids":["19887378"],"is_preprint":false},{"year":2016,"finding":"Upon lysosomal rupture, p97/VCP translocates to damaged lysosomes and cooperates with PLAA, UBXD1, and the deubiquitinase YOD1 (collectively termed ELDR components) to selectively remove K48-linked ubiquitin conjugates from a subpopulation of damaged lysosomes, thereby promoting autophagosome formation downstream of K63-linked ubiquitination and p62 recruitment. Loss of p97 or these cofactors impairs clearance of ruptured lysosomes by autophagy.","method":"SiRNA knockdown, co-immunoprecipitation, ubiquitin-linkage–specific antibodies, lysosomal damage assays, MEF p97 mutant model, patient tissue analysis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, genetic loss-of-function with defined cellular phenotype, replicated across cell and animal models","pmids":["27753622"],"is_preprint":false},{"year":2017,"finding":"Hypomorphic mutations in PLAA (ubiquitin adaptor protein) in both humans and mice cause accumulation of K63-polyubiquitylated proteins and synaptic membrane proteins due to perturbed endolysosomal degradation, disrupting synaptic vesicle recycling and neurotransmission. This establishes PLAA as an essential mediator of ubiquitin-mediated endolysosomal trafficking at the synapse.","method":"Human genetics (biallelic PLAA mutations), mouse hypomorphic Plaa mutant neurons, biochemical analysis of ubiquitin conjugates, electrophysiology of synaptic vesicle recycling","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — human and mouse loss-of-function with multiple orthogonal mechanistic readouts","pmids":["28413018"],"is_preprint":false},{"year":2008,"finding":"Doa1/PLAA's PFU domain directly binds the SH3 domain of Hse1 (STAM homolog in yeast) with an affinity that is independent of ubiquitin binding. Mutations in Doa1 that block Hse1 binding without affecting ubiquitin binding cause missorting of the MVB cargo GFP-Cps1 and a synthetic growth defect with loss of Vps27, placing Doa1 in the endosomal sorting/MVB pathway.","method":"Direct binding assay (pulldown), site-directed mutagenesis of Doa1, GFP-cargo missorting assay, genetic epistasis (doa1Δ vps27Δ double mutant), ubiquitin overexpression suppression test","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (pulldown, mutagenesis, genetic epistasis, cargo trafficking assay) in single study","pmids":["18508771"],"is_preprint":false},{"year":2010,"finding":"Crystal structure of the PFU–PUL domain pair of yeast Doa1/Ufd3 (PLAA ortholog) at 1.9 Å revealed that the PUL domain adopts an Armadillo-like repeat structure with a positively charged concave surface that binds the negatively charged C-terminal region of Cdc48/p97, and that the PFU domain surface is implicated in binding ubiquitin and Hse1.","method":"X-ray crystallography; surface electrostatic analysis; structural comparison with Ufd2","journal":"The Kobe journal of medical sciences","confidence":"Medium","confidence_rationale":"Tier 1 — crystal structure, but limited functional mutagenesis follow-up in the same paper","pmids":["21063153"],"is_preprint":false},{"year":2015,"finding":"Wss1 metalloprotease forms a SUMO-specific ternary complex with the AAA ATPase Cdc48 and Doa1/PLAA as adaptor upon genotoxic stress. Doa1 serves as the adaptor bridging Wss1 to Cdc48 for processing sumoylated chromatin-bound proteins and clearing covalent topoisomerase complexes.","method":"Co-immunoprecipitation, yeast genetics (suppressor analysis), in vivo UV/camptothecin survival assays, biochemical reconstitution of the ternary complex","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal Co-IP and genetic evidence, but PLAA/Doa1 adaptor role is one component of a multi-protein complex characterization","pmids":["26349035"],"is_preprint":false},{"year":2006,"finding":"Doa1/PLAA (yeast ortholog) controls ubiquitin availability for the DNA damage response: in doa1Δ cells, damage-induced PCNA monoubiquitination is abolished and histone H2B ubiquitination is severely reduced. Ubiquitin overexpression rescues PCNA ubiquitination but not H2B ubiquitination, indicating that Doa1 both supplies ubiquitin (from the proteasomal pathway) and plays a more specific role in H2B monoubiquitination during DNA damage.","method":"Yeast genetic interaction screen, ubiquitin immunoblotting, ubiquitin overexpression suppression, epistasis with RAD6, RAD18, BRE1, UBP8/UBP10","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 — genetic epistasis with multiple alleles and biochemical readout, single lab","pmids":["16705165"],"is_preprint":false},{"year":2016,"finding":"Doa1/PLAA (yeast ortholog) functions as a substrate-recruiting adaptor for the Cdc48-Ufd1-Npl4 complex specifically in mitochondria-associated degradation (MAD): Doa1 interacts with ubiquitinated outer-membrane substrates and facilitates their recruitment to Cdc48, and is critical for cell survival under mitochondrial oxidative stress but dispensable under ER stress.","method":"Genetic screen (MAD pathway), substrate accumulation assays, co-immunoprecipitation of Doa1 with ubiquitinated substrates and Cdc48, deletion analysis, oxidative stress survival","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal Co-IP and genetic loss-of-function with specific pathway phenotype, single lab","pmids":["27044889"],"is_preprint":false},{"year":2014,"finding":"PLAA (via its molecular interaction with Pdia3 membrane receptor) and caveolae are required for rapid 1α,25(OH)2D3-mediated activation of Ca2+/calmodulin-dependent protein kinase II (CaMKII) in growth plate chondrocytes. Immunoprecipitation showed increased CaM binding to PLAA in response to 1α,25(OH)2D3, placing PLAA upstream of CaMKII in this non-genomic vitamin D signaling cascade.","method":"Antibody blocking of PLAA or Pdia3, PLAA peptide stimulation, caveolae disruption (methyl-β-cyclodextrin), co-immunoprecipitation (CaM–PLAA), CaMKII activity assay","journal":"Connective tissue research","confidence":"Medium","confidence_rationale":"Tier 2–3 — multiple orthogonal methods (antibody block, peptide stimulation, Co-IP, caveolae disruption) but relies on peptide surrogate rather than genetic loss-of-function","pmids":["25158196"],"is_preprint":false},{"year":2005,"finding":"PLAA is required for 1α,25(OH)2D3 rapid membrane-mediated signaling in growth plate chondrocytes: PLAA peptide increases arachidonic acid release, PLA2 activity, PKCα (but not other PKC isoforms), phospholipase C-β1/β3 activity, alkaline phosphatase, and proteoglycan production comparable to 1α,25(OH)2D3. PLA2 inhibitors and cyclooxygenase inhibitors block PLAA peptide effects on PKC, indicating arachidonic acid and its metabolites (via EP1 prostaglandin receptor) mediate downstream signaling.","method":"PLAA peptide addition to chondrocyte cultures, PLA2 activity assay, PKC isoform-specific assays, PLC activity assay, inhibitor pharmacology (quinacrine, AACOCF3, indomethacin, SC19220, AH6809), [3H]-thymidine incorporation","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2–3 — multiple biochemical assays and pharmacological dissection, but relies on exogenous peptide rather than genetic loss-of-function","pmids":["15368540"],"is_preprint":false},{"year":2009,"finding":"PLAA overexpression enhances cisplatin-induced apoptosis in HeLa cells through four pathways: (1) accumulation of arachidonic acid and mitochondrial damage (cytochrome c release); (2) downregulation of cytoprotective clusterin; (3) upregulation of pro-apoptotic IL-32; and (4) activation of JNK/c-Jun signaling and FasL expression. siRNA knockdown of PLAA reduces cisplatin-induced DNA fragmentation and PLA2 activation, confirming that these effects are PLAA-dependent.","method":"Tet-off PLAA overexpression system, siRNA knockdown, caspase activity assays, cytochrome c leakage, PLA2 activity, proteomics (phospho-JNK/c-Jun), exogenous arachidonic acid rescue","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2–3 — gain- and loss-of-function with multiple mechanistic readouts in a single lab study","pmids":["19258036"],"is_preprint":false},{"year":2008,"finding":"PLAA overexpression (plaa-high HeLa cells) enhances TNF-α-induced activation of cytosolic PLA2, COX-2, and NF-κB, leading to increased PGE2 and IL-6 production. Sp1 transcription factor binds a stimulatory element in exon 1 of the plaa gene and maintains its basal expression, as demonstrated by luciferase reporter assay and competitive decoy oligonucleotide binding.","method":"Tet-off overexpression, ELISA (PGE2, IL-6), microarray with functional follow-up, luciferase reporter assay, Sp1 decoy oligonucleotides, competitive binding assay","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2–3 — multiple orthogonal methods, single lab","pmids":["18291623"],"is_preprint":false},{"year":2022,"finding":"PLAA inhibits ovarian cancer metastasis by promoting ubiquitin-mediated degradation of METTL3, thereby reducing METTL3-dependent m6A modification of TRPC3 mRNA. Reduced TRPC3 mRNA stability lowers TRPC3 protein and intracellular Ca2+ levels, suppressing cancer cell migration and invasion.","method":"PLAA knockdown/overexpression in cell lines, orthotopic xenograft mouse model, ubiquitination assays, METTL3 m6A-seq, TRPC3 mRNA stability assay, Ca2+ imaging","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — multiple mechanistic assays plus in vivo validation, single lab","pmids":["35869392"],"is_preprint":false},{"year":2024,"finding":"De novo missense variants in the PUL domain of PLAA found in children with neurodevelopmental disorders (autism, intellectual disability) reduce PLAA–p97/VCP interaction as shown by in vitro binding assays, and computational modeling reveals abnormal C-terminal chain arrangements, establishing that disruption of PLAA–p97 interaction and consequent perturbed vesicle recycling underlies these NDDs.","method":"Exome/genome sequencing, computational structural modeling, in vitro PLAA–p97 interaction assay with mutant proteins","journal":"Frontiers in molecular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2–3 — in vitro interaction assay with mutant proteins plus structural modeling, limited to single study","pmids":["38650658"],"is_preprint":false},{"year":2014,"finding":"Yeast Doa1/PLAA PFU domain interacts with the SH3 domain of Hse1 with ~5 µM affinity; Asn-438 of Doa1/PFU and Trp-254 of Hse1/SH3 are critical for the interaction (hydrogen bonding is the major determinant), while Phe-434 (ubiquitin-binding residue) is not required. Solution structure of the PFU:SH3 complex was determined by SAXS combined with molecular docking.","method":"Isothermal titration calorimetry, site-directed mutagenesis, small-angle X-ray scattering, molecular docking","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1–2 — SAXS structure plus mutagenesis, single lab study","pmids":["24607902"],"is_preprint":false},{"year":1999,"finding":"PLAP peptide (PLAPp, a PLA2-activating protein peptide) stimulates cytosol-dependent Golgi membrane tubulation in a saturable, dose-dependent manner in vitro and in permeabilized cells, and this stimulation is blocked by cytosolic PLA2 antagonists including the Ca2+-independent PLA2-specific inhibitor bromoenol lactone. The effect is reproduced in a permeabilized cell system reconstituting Golgi-to-ER retrograde trafficking, linking PLA2 activation by PLAP to Golgi tubule formation and retrograde membrane trafficking.","method":"Cell-free Golgi tubulation reconstitution assay, permeabilized cell system, PLA2 antagonist pharmacology (bromoenol lactone, other inhibitors)","journal":"Journal of cellular biochemistry","confidence":"Low","confidence_rationale":"Tier 3 — pharmacological assays with PLAP peptide in reconstituted cell-free system; no genetic loss-of-function or direct protein interaction data","pmids":["10440936"],"is_preprint":false},{"year":1989,"finding":"PLAP (phospholipase A2-activating protein) isolated from human rheumatoid synovial fluid and from neutrophils activates purified low-molecular-weight (~14 kDa) PLA2 more than 20-fold at a protein-to-phospholipid ratio of 1:10^6, while having no effect on a high-molecular-weight (~110 kDa) PLA2, suggesting a direct enzyme–activator interaction rather than membrane perturbation as the mechanism of stimulation.","method":"PLA2 purification; in vitro enzyme activity assay with purified PLAP and purified PLA2 isoforms; comparison with melittin","journal":"Biochimica et biophysica acta","confidence":"Low","confidence_rationale":"Tier 3 — in vitro activity assay with purified proteins but no structural or mutagenesis validation; single study","pmids":["8431486"],"is_preprint":false},{"year":2025,"finding":"C. elegans PLAA ortholog UFD-3 directly interacts with the mRNA decapping complex regulatory subunit DCAP-1, and UFD-3's intrinsic disordered region (IDR) is required for recruiting DCAP-1 to P-bodies. Loss of the IDR does not affect UFD-3's role in sorting ubiquitinated proteins through the MVB pathway, demonstrating that PLAA/UFD-3 regulates the proteome via two distinct pathways: ubiquitin-dependent protein degradation and mRNA regulation through P-bodies.","method":"Proteome-scale interactomics (mass spectrometry), direct biochemical interaction assay (UFD-3–DCAP-1 pulldown), fluorescence imaging of P-bodies in C. elegans, IDR deletion mutant analysis, MVB sorting assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — direct biochemical interaction plus in vivo imaging and domain-dissection genetics, single study in C. elegans ortholog","pmids":["40560612"],"is_preprint":false}],"current_model":"PLAA is a ubiquitin-adaptor protein whose C-terminal PUL (Armadillo-repeat) domain directly binds the C-terminus of the AAA-ATPase p97/VCP, while its PFU domain binds ubiquitin and endosomal sorting factors; through these interactions PLAA functions as a cofactor of p97 in multiple ubiquitin-dependent processes including endolysosomal damage response (clearance of ruptured lysosomes by autophagy via selective K48-ubiquitin removal), mitochondria-associated degradation, DNA-damage ubiquitin channeling, and MVB/endosomal sorting, while at the synapse loss of PLAA disrupts ubiquitin-mediated endolysosomal degradation of synaptic membrane proteins and impairs vesicle recycling, causing neurological disease; additionally, PLAA activates PLA2 in membrane-mediated vitamin D signaling and may regulate mRNA processing bodies via a distinct intrinsically disordered region."},"narrative":{"teleology":[{"year":1989,"claim":"The earliest biochemical activity attributed to PLAA was direct activation of low-molecular-weight PLA2, establishing it as a potential modulator of phospholipid metabolism, though the mechanism was unclear.","evidence":"In vitro enzyme assay with purified PLAP and PLA2 isoforms from human synovial fluid","pmids":["8431486"],"confidence":"Low","gaps":["No mutagenesis or structural validation of the activator–enzyme interaction","Relationship to PLAA's ubiquitin-binding functions unresolved","Activation mechanism (direct vs. indirect) not distinguished"]},{"year":1999,"claim":"PLAP peptide was shown to stimulate Golgi membrane tubulation through PLA2 activation, linking PLAA to retrograde membrane trafficking, but only through pharmacological reconstitution.","evidence":"Cell-free Golgi tubulation assay and permeabilized cell system with PLA2 antagonist pharmacology","pmids":["10440936"],"confidence":"Low","gaps":["Relies on exogenous peptide without genetic loss-of-function","No identification of the specific PLA2 isoform involved in cells","Relationship to PLAA's p97-binding functions unknown"]},{"year":2005,"claim":"PLAA peptide recapitulated 1α,25(OH)₂D₃ rapid signaling in chondrocytes—activating PLA2, PKCα, and PLC—establishing PLAA as an effector in non-genomic vitamin D signaling upstream of arachidonic acid release.","evidence":"Peptide addition to chondrocyte cultures with PLA2, PKC isoform, and PLC activity assays plus inhibitor pharmacology","pmids":["15368540"],"confidence":"Medium","gaps":["Relies on exogenous peptide rather than genetic ablation","Direct physical interaction between PLAA and the vitamin D membrane receptor not structurally resolved"]},{"year":2006,"claim":"Using the yeast ortholog Doa1, PLAA was placed in ubiquitin homeostasis: Doa1 loss abolished damage-induced PCNA monoubiquitination and reduced H2B ubiquitination, revealing both ubiquitin-supply and substrate-specific functions in the DNA damage response.","evidence":"Yeast doa1Δ mutant with ubiquitin immunoblotting, overexpression rescue, and epistasis with RAD6/RAD18/BRE1","pmids":["16705165"],"confidence":"Medium","gaps":["H2B ubiquitination defect not rescued by ubiquitin overexpression—mechanism unknown","Not tested in mammalian cells"]},{"year":2008,"claim":"The PFU domain was shown to bind the endosomal sorting factor Hse1/STAM independently of ubiquitin binding, placing PLAA directly in the MVB sorting pathway—a function distinct from its ubiquitin-supply role.","evidence":"Direct pulldown, site-directed mutagenesis separating Hse1-binding from ubiquitin-binding residues, GFP-Cps1 cargo missorting, and genetic epistasis with vps27Δ in yeast","pmids":["18508771"],"confidence":"High","gaps":["Mammalian STAM–PLAA interaction not validated","Structural basis of PFU–SH3 interaction not yet determined at this time"]},{"year":2009,"claim":"The crystal structure of the PUL domain bound to the p97 C-terminal peptide revealed the Armadillo-repeat architecture and the critical p97-Tyr805 burial, and mutagenesis proved this interface is functionally required for a subset of ubiquitin-pathway processes.","evidence":"X-ray crystallography of PUL–p97 complex; Doa1 PUL point mutants with in vivo complementation in yeast","pmids":["19887378"],"confidence":"High","gaps":["Full-length PLAA–p97 hexamer complex structure not resolved","Which mammalian p97-dependent processes specifically require the PUL interface was not tested"]},{"year":2014,"claim":"Quantitative biophysics (ITC, SAXS) of the PFU–Hse1/SH3 interaction defined ~5 µM affinity and identified critical residues (Doa1-Asn438, Hse1-Trp254), separating this interface from ubiquitin binding at Phe434.","evidence":"ITC affinity measurement, SAXS molecular envelope, site-directed mutagenesis in yeast","pmids":["24607902"],"confidence":"Medium","gaps":["Solution structure from SAXS is low-resolution compared to crystallography","Functional consequence of affinity perturbation not tested in vivo"]},{"year":2016,"claim":"Two studies established PLAA as a p97 cofactor in organelle-specific quality control: (1) at damaged lysosomes, PLAA/UBXD1/YOD1 selectively remove K48-ubiquitin to license autophagic clearance; (2) at mitochondria, Doa1/PLAA recruits ubiquitinated outer-membrane substrates to Cdc48 for mitochondria-associated degradation.","evidence":"siRNA knockdown, ubiquitin-linkage antibodies, lysosomal damage assay in mammalian cells (ELDR); genetic screen, Co-IP with ubiquitinated mitochondrial substrates, oxidative stress survival in yeast (MAD)","pmids":["27753622","27044889"],"confidence":"High","gaps":["Structural basis for PLAA selectivity toward K48- vs K63-ubiquitin chains not determined","Whether PLAA functions in MAD in mammalian cells not tested"]},{"year":2017,"claim":"Biallelic PLAA mutations in humans caused progressive neurodegeneration with K63-polyubiquitin accumulation and impaired synaptic vesicle recycling, establishing PLAA as essential for ubiquitin-dependent endolysosomal degradation at the synapse and linking it to Mendelian neurodevelopmental disease.","evidence":"Human patient genetics plus hypomorphic mouse Plaa mutant with electrophysiology, ubiquitin-conjugate profiling, and synaptic vesicle assays","pmids":["28413018"],"confidence":"High","gaps":["Precise synaptic substrates whose accumulation drives pathology not identified","Whether disease mechanism is p97-dependent or involves PLAA's other interactions not resolved"]},{"year":2022,"claim":"In ovarian cancer cells, PLAA was shown to promote ubiquitin-mediated degradation of METTL3, thereby reducing m6A modification and stability of TRPC3 mRNA and suppressing metastasis—linking PLAA's ubiquitin-adaptor function to epitranscriptomic regulation.","evidence":"PLAA knockdown/overexpression, ubiquitination assays, m6A-seq, TRPC3 stability assay, orthotopic xenograft model","pmids":["35869392"],"confidence":"Medium","gaps":["Whether PLAA promotes METTL3 degradation via p97 not tested","Generalizability beyond ovarian cancer unknown"]},{"year":2024,"claim":"De novo PUL-domain missense variants in children with autism and intellectual disability were shown to reduce PLAA–p97 binding in vitro, extending the disease spectrum and confirming that the p97 interaction is critical for neurodevelopment.","evidence":"Exome sequencing, computational structural modeling, in vitro PLAA–p97 binding assay with mutant proteins","pmids":["38650658"],"confidence":"Medium","gaps":["No cellular or animal model validation of these specific variants","Whether variants also affect other PLAA interactions (e.g., PFU-mediated) not assessed"]},{"year":2025,"claim":"A previously unrecognized function was uncovered: PLAA's intrinsically disordered region recruits the mRNA decapping factor DCAP-1 to P-bodies, a role entirely separable from its PFU/PUL-dependent ubiquitin-trafficking functions, revealing that PLAA regulates the proteome through both protein degradation and mRNA regulation.","evidence":"Proteome-scale mass spectrometry, direct pulldown of UFD-3–DCAP-1, P-body imaging, IDR deletion mutants, and MVB sorting assays in C. elegans","pmids":["40560612"],"confidence":"Medium","gaps":["Mammalian PLAA–DCP1 interaction not validated","Whether IDR-mediated P-body function is conserved in vertebrates unknown","Mechanism by which IDR recruits DCAP-1 (direct binding surface) not structurally defined"]},{"year":null,"claim":"Key unresolved questions include: (1) how PLAA distinguishes K48- from K63-linked ubiquitin chains at damaged organelles; (2) whether the PLA2-activating and p97-adaptor functions operate in the same or distinct physiological contexts; (3) the identity of critical synaptic substrates whose accumulation drives neurodegeneration; and (4) whether PLAA's P-body regulatory function via its IDR is conserved in mammals.","evidence":"","pmids":[],"confidence":"Low","gaps":["No ubiquitin-chain selectivity mechanism defined","PLA2 activation vs. p97 adaptor function relationship unresolved","Full-length PLAA structure lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,5,7]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[9,16]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1,10]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[1]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[3,14]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[1]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1,2,7,12]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[2,3]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[5,6]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[17]}],"complexes":["p97/VCP-PLAA-UBXD1-YOD1 (ELDR complex)","Cdc48-Ufd1-Npl4-Doa1 complex","Wss1-Cdc48-Doa1 ternary complex"],"partners":["VCP","UBXD1","YOD1","STAM","DCAP1","METTL3","PDIA3"],"other_free_text":[]},"mechanistic_narrative":"PLAA is a ubiquitin-adaptor protein that bridges the AAA-ATPase p97/VCP to ubiquitinated substrates across multiple quality-control and trafficking pathways, including endolysosomal damage clearance, mitochondria-associated degradation, DNA-damage ubiquitin homeostasis, and multivesicular body sorting. Its C-terminal PUL (Armadillo-repeat) domain binds the p97 C-terminus through a positively charged ridge that buries p97-Tyr805, while its PFU domain independently engages ubiquitin and the endosomal sorting factor Hse1/STAM [PMID:19887378, PMID:18508771]. At damaged lysosomes, PLAA cooperates with UBXD1 and the deubiquitinase YOD1 to selectively remove K48-linked ubiquitin, enabling K63-ubiquitin/p62-dependent autophagic clearance; at synapses, loss-of-function mutations cause K63-polyubiquitin accumulation, impaired vesicle recycling, and neurodevelopmental disease in humans and mice [PMID:27753622, PMID:28413018]. PLAA also regulates mRNA processing bodies through a distinct intrinsically disordered region that recruits the decapping-complex subunit DCAP-1, a function separable from its ubiquitin-dependent roles [PMID:40560612]."},"prefetch_data":{"uniprot":{"accession":"Q9Y263","full_name":"Phospholipase A-2-activating protein","aliases":[],"length_aa":795,"mass_kda":87.2,"function":"Plays a role in protein ubiquitination, sorting and degradation through its association with VCP (PubMed:27753622). Involved in ubiquitin-mediated membrane proteins trafficking to late endosomes in an ESCRT-dependent manner, and hence plays a role in synaptic vesicle recycling (By similarity). May play a role in macroautophagy, regulating for instance the clearance of damaged lysosomes (PubMed:27753622). Plays a role in cerebellar Purkinje cell development (By similarity). Positively regulates cytosolic and calcium-independent phospholipase A2 activities in a tumor necrosis factor alpha (TNF)- or lipopolysaccharide (LPS)-dependent manner, and hence prostaglandin E2 biosynthesis (PubMed:18291623, PubMed:28007986)","subcellular_location":"Nucleus; Cytoplasm; Synapse","url":"https://www.uniprot.org/uniprotkb/Q9Y263/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PLAA","classification":"Not Classified","n_dependent_lines":25,"n_total_lines":1208,"dependency_fraction":0.020695364238410598},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"EMC9","stoichiometry":0.2},{"gene":"NCAPH","stoichiometry":0.2},{"gene":"VCP","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/PLAA","total_profiled":1310},"omim":[{"mim_id":"617527","title":"NEURODEVELOPMENTAL DISORDER WITH PROGRESSIVE MICROCEPHALY, SPASTICITY, AND BRAIN ANOMALIES; NDMSBA","url":"https://www.omim.org/entry/617527"},{"mim_id":"603873","title":"PHOSPHOLIPASE A2-ACTIVATING PROTEIN; PLAA","url":"https://www.omim.org/entry/603873"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/PLAA"},"hgnc":{"alias_symbol":["PLAP","PLA2P","FLJ11281","FLJ12699","DOA1"],"prev_symbol":[]},"alphafold":{"accession":"Q9Y263","domains":[{"cath_id":"2.130.10.10","chopping":"10-320","consensus_level":"medium","plddt":93.7396,"start":10,"end":320},{"cath_id":"-","chopping":"321-384_392-402","consensus_level":"medium","plddt":76.766,"start":321,"end":402},{"cath_id":"3.10.20.870","chopping":"404-456","consensus_level":"medium","plddt":80.8391,"start":404,"end":456},{"cath_id":"1.25.10.10","chopping":"549-795","consensus_level":"medium","plddt":92.0652,"start":549,"end":795}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y263","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y263-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y263-F1-predicted_aligned_error_v6.png","plddt_mean":84.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PLAA","jax_strain_url":"https://www.jax.org/strain/search?query=PLAA"},"sequence":{"accession":"Q9Y263","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y263.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y263/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y263"}},"corpus_meta":[{"pmid":"27753622","id":"PMC_27753622","title":"VCP/p97 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Section F, Structural biology communications","url":"https://pubmed.ncbi.nlm.nih.gov/32133999","citation_count":1,"is_preprint":false},{"pmid":"40560612","id":"PMC_40560612","title":"PLAA/UFD-3 regulates P-bodies through its intrinsic disordered domain.","date":"2025","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/40560612","citation_count":1,"is_preprint":false},{"pmid":"11506080","id":"PMC_11506080","title":"Isolation of antibody to human placental alkaline phosphatase (PLAP) from extracts of human placentae.","date":"2001","source":"American journal of reproductive immunology (New York, N.Y. : 1989)","url":"https://pubmed.ncbi.nlm.nih.gov/11506080","citation_count":1,"is_preprint":false},{"pmid":"3658925","id":"PMC_3658925","title":"Structural relationships between the isoenzymes of human placental alkaline phosphatase: a serum factor converts M-PLAP to A- and B-PLAP.","date":"1987","source":"Placenta","url":"https://pubmed.ncbi.nlm.nih.gov/3658925","citation_count":1,"is_preprint":false},{"pmid":"8845338","id":"PMC_8845338","title":"Distribution of placental alkaline phosphatase gene (PLAP) frequencies in two groups of Muslim populations of Andhra Pradesh.","date":"1995","source":"Gene geography : a computerized bulletin on human gene frequencies","url":"https://pubmed.ncbi.nlm.nih.gov/8845338","citation_count":1,"is_preprint":false},{"pmid":"39680294","id":"PMC_39680294","title":"PLAP expression is linked to invasive tumor growth in urothelial carcinoma of the bladder.","date":"2024","source":"International urology and nephrology","url":"https://pubmed.ncbi.nlm.nih.gov/39680294","citation_count":0,"is_preprint":false},{"pmid":"9049616","id":"PMC_9049616","title":"Distribution of placental alkaline phosphatase (PLAP) gene frequencies in Andhra Pradesh (south India).","date":"1996","source":"Gene geography : a computerized bulletin on human gene frequencies","url":"https://pubmed.ncbi.nlm.nih.gov/9049616","citation_count":0,"is_preprint":false},{"pmid":"41989751","id":"PMC_41989751","title":"PLAP Targeted Antibody-Radionuclide Conjugate for Theranostics in Pancreatic Cancer.","date":"2026","source":"Journal of medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/41989751","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":47396,"output_tokens":5262,"usd":0.110559},"stage2":{"model":"claude-opus-4-6","input_tokens":8811,"output_tokens":3492,"usd":0.197032},"total_usd":0.307591,"stage1_batch_id":"msgbatch_01SUR8NDzVrNmyszWyJeCct7","stage2_batch_id":"msgbatch_01G7Yfutko3cDWzejrwH5AMx","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2009,\n      \"finding\": \"The C-terminal PUL domain of PLAA forms a 6-mer Armadillo-containing domain whose N-terminal extension folds back to create a positively charged ridge that binds the C-terminus of p97/VCP (specifically burying p97-Tyr805). Crystal structure of the PUL domain–p97 C-terminal peptide complex was solved at high resolution, and point mutations in the yeast ortholog Doa1 that disrupt this interface reduce ubiquitin levels and cause subset-specific growth phenotypes, demonstrating that the p97–PLAA physical interaction is functionally important for a subset of PLAA-dependent ubiquitin-pathway processes.\",\n      \"method\": \"X-ray crystallography of PUL–p97 complex; site-directed mutagenesis of Doa1 PUL domain; in vivo complementation in doa1Δ yeast\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure plus mutagenesis with in vivo functional validation in a single study\",\n      \"pmids\": [\"19887378\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Upon lysosomal rupture, p97/VCP translocates to damaged lysosomes and cooperates with PLAA, UBXD1, and the deubiquitinase YOD1 (collectively termed ELDR components) to selectively remove K48-linked ubiquitin conjugates from a subpopulation of damaged lysosomes, thereby promoting autophagosome formation downstream of K63-linked ubiquitination and p62 recruitment. Loss of p97 or these cofactors impairs clearance of ruptured lysosomes by autophagy.\",\n      \"method\": \"SiRNA knockdown, co-immunoprecipitation, ubiquitin-linkage–specific antibodies, lysosomal damage assays, MEF p97 mutant model, patient tissue analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, genetic loss-of-function with defined cellular phenotype, replicated across cell and animal models\",\n      \"pmids\": [\"27753622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Hypomorphic mutations in PLAA (ubiquitin adaptor protein) in both humans and mice cause accumulation of K63-polyubiquitylated proteins and synaptic membrane proteins due to perturbed endolysosomal degradation, disrupting synaptic vesicle recycling and neurotransmission. This establishes PLAA as an essential mediator of ubiquitin-mediated endolysosomal trafficking at the synapse.\",\n      \"method\": \"Human genetics (biallelic PLAA mutations), mouse hypomorphic Plaa mutant neurons, biochemical analysis of ubiquitin conjugates, electrophysiology of synaptic vesicle recycling\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — human and mouse loss-of-function with multiple orthogonal mechanistic readouts\",\n      \"pmids\": [\"28413018\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Doa1/PLAA's PFU domain directly binds the SH3 domain of Hse1 (STAM homolog in yeast) with an affinity that is independent of ubiquitin binding. Mutations in Doa1 that block Hse1 binding without affecting ubiquitin binding cause missorting of the MVB cargo GFP-Cps1 and a synthetic growth defect with loss of Vps27, placing Doa1 in the endosomal sorting/MVB pathway.\",\n      \"method\": \"Direct binding assay (pulldown), site-directed mutagenesis of Doa1, GFP-cargo missorting assay, genetic epistasis (doa1Δ vps27Δ double mutant), ubiquitin overexpression suppression test\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (pulldown, mutagenesis, genetic epistasis, cargo trafficking assay) in single study\",\n      \"pmids\": [\"18508771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Crystal structure of the PFU–PUL domain pair of yeast Doa1/Ufd3 (PLAA ortholog) at 1.9 Å revealed that the PUL domain adopts an Armadillo-like repeat structure with a positively charged concave surface that binds the negatively charged C-terminal region of Cdc48/p97, and that the PFU domain surface is implicated in binding ubiquitin and Hse1.\",\n      \"method\": \"X-ray crystallography; surface electrostatic analysis; structural comparison with Ufd2\",\n      \"journal\": \"The Kobe journal of medical sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure, but limited functional mutagenesis follow-up in the same paper\",\n      \"pmids\": [\"21063153\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Wss1 metalloprotease forms a SUMO-specific ternary complex with the AAA ATPase Cdc48 and Doa1/PLAA as adaptor upon genotoxic stress. Doa1 serves as the adaptor bridging Wss1 to Cdc48 for processing sumoylated chromatin-bound proteins and clearing covalent topoisomerase complexes.\",\n      \"method\": \"Co-immunoprecipitation, yeast genetics (suppressor analysis), in vivo UV/camptothecin survival assays, biochemical reconstitution of the ternary complex\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP and genetic evidence, but PLAA/Doa1 adaptor role is one component of a multi-protein complex characterization\",\n      \"pmids\": [\"26349035\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Doa1/PLAA (yeast ortholog) controls ubiquitin availability for the DNA damage response: in doa1Δ cells, damage-induced PCNA monoubiquitination is abolished and histone H2B ubiquitination is severely reduced. Ubiquitin overexpression rescues PCNA ubiquitination but not H2B ubiquitination, indicating that Doa1 both supplies ubiquitin (from the proteasomal pathway) and plays a more specific role in H2B monoubiquitination during DNA damage.\",\n      \"method\": \"Yeast genetic interaction screen, ubiquitin immunoblotting, ubiquitin overexpression suppression, epistasis with RAD6, RAD18, BRE1, UBP8/UBP10\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with multiple alleles and biochemical readout, single lab\",\n      \"pmids\": [\"16705165\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Doa1/PLAA (yeast ortholog) functions as a substrate-recruiting adaptor for the Cdc48-Ufd1-Npl4 complex specifically in mitochondria-associated degradation (MAD): Doa1 interacts with ubiquitinated outer-membrane substrates and facilitates their recruitment to Cdc48, and is critical for cell survival under mitochondrial oxidative stress but dispensable under ER stress.\",\n      \"method\": \"Genetic screen (MAD pathway), substrate accumulation assays, co-immunoprecipitation of Doa1 with ubiquitinated substrates and Cdc48, deletion analysis, oxidative stress survival\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP and genetic loss-of-function with specific pathway phenotype, single lab\",\n      \"pmids\": [\"27044889\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PLAA (via its molecular interaction with Pdia3 membrane receptor) and caveolae are required for rapid 1α,25(OH)2D3-mediated activation of Ca2+/calmodulin-dependent protein kinase II (CaMKII) in growth plate chondrocytes. Immunoprecipitation showed increased CaM binding to PLAA in response to 1α,25(OH)2D3, placing PLAA upstream of CaMKII in this non-genomic vitamin D signaling cascade.\",\n      \"method\": \"Antibody blocking of PLAA or Pdia3, PLAA peptide stimulation, caveolae disruption (methyl-β-cyclodextrin), co-immunoprecipitation (CaM–PLAA), CaMKII activity assay\",\n      \"journal\": \"Connective tissue research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — multiple orthogonal methods (antibody block, peptide stimulation, Co-IP, caveolae disruption) but relies on peptide surrogate rather than genetic loss-of-function\",\n      \"pmids\": [\"25158196\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"PLAA is required for 1α,25(OH)2D3 rapid membrane-mediated signaling in growth plate chondrocytes: PLAA peptide increases arachidonic acid release, PLA2 activity, PKCα (but not other PKC isoforms), phospholipase C-β1/β3 activity, alkaline phosphatase, and proteoglycan production comparable to 1α,25(OH)2D3. PLA2 inhibitors and cyclooxygenase inhibitors block PLAA peptide effects on PKC, indicating arachidonic acid and its metabolites (via EP1 prostaglandin receptor) mediate downstream signaling.\",\n      \"method\": \"PLAA peptide addition to chondrocyte cultures, PLA2 activity assay, PKC isoform-specific assays, PLC activity assay, inhibitor pharmacology (quinacrine, AACOCF3, indomethacin, SC19220, AH6809), [3H]-thymidine incorporation\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — multiple biochemical assays and pharmacological dissection, but relies on exogenous peptide rather than genetic loss-of-function\",\n      \"pmids\": [\"15368540\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PLAA overexpression enhances cisplatin-induced apoptosis in HeLa cells through four pathways: (1) accumulation of arachidonic acid and mitochondrial damage (cytochrome c release); (2) downregulation of cytoprotective clusterin; (3) upregulation of pro-apoptotic IL-32; and (4) activation of JNK/c-Jun signaling and FasL expression. siRNA knockdown of PLAA reduces cisplatin-induced DNA fragmentation and PLA2 activation, confirming that these effects are PLAA-dependent.\",\n      \"method\": \"Tet-off PLAA overexpression system, siRNA knockdown, caspase activity assays, cytochrome c leakage, PLA2 activity, proteomics (phospho-JNK/c-Jun), exogenous arachidonic acid rescue\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — gain- and loss-of-function with multiple mechanistic readouts in a single lab study\",\n      \"pmids\": [\"19258036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"PLAA overexpression (plaa-high HeLa cells) enhances TNF-α-induced activation of cytosolic PLA2, COX-2, and NF-κB, leading to increased PGE2 and IL-6 production. Sp1 transcription factor binds a stimulatory element in exon 1 of the plaa gene and maintains its basal expression, as demonstrated by luciferase reporter assay and competitive decoy oligonucleotide binding.\",\n      \"method\": \"Tet-off overexpression, ELISA (PGE2, IL-6), microarray with functional follow-up, luciferase reporter assay, Sp1 decoy oligonucleotides, competitive binding assay\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — multiple orthogonal methods, single lab\",\n      \"pmids\": [\"18291623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PLAA inhibits ovarian cancer metastasis by promoting ubiquitin-mediated degradation of METTL3, thereby reducing METTL3-dependent m6A modification of TRPC3 mRNA. Reduced TRPC3 mRNA stability lowers TRPC3 protein and intracellular Ca2+ levels, suppressing cancer cell migration and invasion.\",\n      \"method\": \"PLAA knockdown/overexpression in cell lines, orthotopic xenograft mouse model, ubiquitination assays, METTL3 m6A-seq, TRPC3 mRNA stability assay, Ca2+ imaging\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple mechanistic assays plus in vivo validation, single lab\",\n      \"pmids\": [\"35869392\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"De novo missense variants in the PUL domain of PLAA found in children with neurodevelopmental disorders (autism, intellectual disability) reduce PLAA–p97/VCP interaction as shown by in vitro binding assays, and computational modeling reveals abnormal C-terminal chain arrangements, establishing that disruption of PLAA–p97 interaction and consequent perturbed vesicle recycling underlies these NDDs.\",\n      \"method\": \"Exome/genome sequencing, computational structural modeling, in vitro PLAA–p97 interaction assay with mutant proteins\",\n      \"journal\": \"Frontiers in molecular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — in vitro interaction assay with mutant proteins plus structural modeling, limited to single study\",\n      \"pmids\": [\"38650658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Yeast Doa1/PLAA PFU domain interacts with the SH3 domain of Hse1 with ~5 µM affinity; Asn-438 of Doa1/PFU and Trp-254 of Hse1/SH3 are critical for the interaction (hydrogen bonding is the major determinant), while Phe-434 (ubiquitin-binding residue) is not required. Solution structure of the PFU:SH3 complex was determined by SAXS combined with molecular docking.\",\n      \"method\": \"Isothermal titration calorimetry, site-directed mutagenesis, small-angle X-ray scattering, molecular docking\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 — SAXS structure plus mutagenesis, single lab study\",\n      \"pmids\": [\"24607902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"PLAP peptide (PLAPp, a PLA2-activating protein peptide) stimulates cytosol-dependent Golgi membrane tubulation in a saturable, dose-dependent manner in vitro and in permeabilized cells, and this stimulation is blocked by cytosolic PLA2 antagonists including the Ca2+-independent PLA2-specific inhibitor bromoenol lactone. The effect is reproduced in a permeabilized cell system reconstituting Golgi-to-ER retrograde trafficking, linking PLA2 activation by PLAP to Golgi tubule formation and retrograde membrane trafficking.\",\n      \"method\": \"Cell-free Golgi tubulation reconstitution assay, permeabilized cell system, PLA2 antagonist pharmacology (bromoenol lactone, other inhibitors)\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — pharmacological assays with PLAP peptide in reconstituted cell-free system; no genetic loss-of-function or direct protein interaction data\",\n      \"pmids\": [\"10440936\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"PLAP (phospholipase A2-activating protein) isolated from human rheumatoid synovial fluid and from neutrophils activates purified low-molecular-weight (~14 kDa) PLA2 more than 20-fold at a protein-to-phospholipid ratio of 1:10^6, while having no effect on a high-molecular-weight (~110 kDa) PLA2, suggesting a direct enzyme–activator interaction rather than membrane perturbation as the mechanism of stimulation.\",\n      \"method\": \"PLA2 purification; in vitro enzyme activity assay with purified PLAP and purified PLA2 isoforms; comparison with melittin\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — in vitro activity assay with purified proteins but no structural or mutagenesis validation; single study\",\n      \"pmids\": [\"8431486\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"C. elegans PLAA ortholog UFD-3 directly interacts with the mRNA decapping complex regulatory subunit DCAP-1, and UFD-3's intrinsic disordered region (IDR) is required for recruiting DCAP-1 to P-bodies. Loss of the IDR does not affect UFD-3's role in sorting ubiquitinated proteins through the MVB pathway, demonstrating that PLAA/UFD-3 regulates the proteome via two distinct pathways: ubiquitin-dependent protein degradation and mRNA regulation through P-bodies.\",\n      \"method\": \"Proteome-scale interactomics (mass spectrometry), direct biochemical interaction assay (UFD-3–DCAP-1 pulldown), fluorescence imaging of P-bodies in C. elegans, IDR deletion mutant analysis, MVB sorting assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct biochemical interaction plus in vivo imaging and domain-dissection genetics, single study in C. elegans ortholog\",\n      \"pmids\": [\"40560612\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PLAA is a ubiquitin-adaptor protein whose C-terminal PUL (Armadillo-repeat) domain directly binds the C-terminus of the AAA-ATPase p97/VCP, while its PFU domain binds ubiquitin and endosomal sorting factors; through these interactions PLAA functions as a cofactor of p97 in multiple ubiquitin-dependent processes including endolysosomal damage response (clearance of ruptured lysosomes by autophagy via selective K48-ubiquitin removal), mitochondria-associated degradation, DNA-damage ubiquitin channeling, and MVB/endosomal sorting, while at the synapse loss of PLAA disrupts ubiquitin-mediated endolysosomal degradation of synaptic membrane proteins and impairs vesicle recycling, causing neurological disease; additionally, PLAA activates PLA2 in membrane-mediated vitamin D signaling and may regulate mRNA processing bodies via a distinct intrinsically disordered region.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"PLAA is a ubiquitin-adaptor protein that bridges the AAA-ATPase p97/VCP to ubiquitinated substrates across multiple quality-control and trafficking pathways, including endolysosomal damage clearance, mitochondria-associated degradation, DNA-damage ubiquitin homeostasis, and multivesicular body sorting. Its C-terminal PUL (Armadillo-repeat) domain binds the p97 C-terminus through a positively charged ridge that buries p97-Tyr805, while its PFU domain independently engages ubiquitin and the endosomal sorting factor Hse1/STAM [PMID:19887378, PMID:18508771]. At damaged lysosomes, PLAA cooperates with UBXD1 and the deubiquitinase YOD1 to selectively remove K48-linked ubiquitin, enabling K63-ubiquitin/p62-dependent autophagic clearance; at synapses, loss-of-function mutations cause K63-polyubiquitin accumulation, impaired vesicle recycling, and neurodevelopmental disease in humans and mice [PMID:27753622, PMID:28413018]. PLAA also regulates mRNA processing bodies through a distinct intrinsically disordered region that recruits the decapping-complex subunit DCAP-1, a function separable from its ubiquitin-dependent roles [PMID:40560612].\",\n  \"teleology\": [\n    {\n      \"year\": 1989,\n      \"claim\": \"The earliest biochemical activity attributed to PLAA was direct activation of low-molecular-weight PLA2, establishing it as a potential modulator of phospholipid metabolism, though the mechanism was unclear.\",\n      \"evidence\": \"In vitro enzyme assay with purified PLAP and PLA2 isoforms from human synovial fluid\",\n      \"pmids\": [\"8431486\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No mutagenesis or structural validation of the activator–enzyme interaction\", \"Relationship to PLAA's ubiquitin-binding functions unresolved\", \"Activation mechanism (direct vs. indirect) not distinguished\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"PLAP peptide was shown to stimulate Golgi membrane tubulation through PLA2 activation, linking PLAA to retrograde membrane trafficking, but only through pharmacological reconstitution.\",\n      \"evidence\": \"Cell-free Golgi tubulation assay and permeabilized cell system with PLA2 antagonist pharmacology\",\n      \"pmids\": [\"10440936\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Relies on exogenous peptide without genetic loss-of-function\", \"No identification of the specific PLA2 isoform involved in cells\", \"Relationship to PLAA's p97-binding functions unknown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"PLAA peptide recapitulated 1α,25(OH)₂D₃ rapid signaling in chondrocytes—activating PLA2, PKCα, and PLC—establishing PLAA as an effector in non-genomic vitamin D signaling upstream of arachidonic acid release.\",\n      \"evidence\": \"Peptide addition to chondrocyte cultures with PLA2, PKC isoform, and PLC activity assays plus inhibitor pharmacology\",\n      \"pmids\": [\"15368540\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relies on exogenous peptide rather than genetic ablation\", \"Direct physical interaction between PLAA and the vitamin D membrane receptor not structurally resolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Using the yeast ortholog Doa1, PLAA was placed in ubiquitin homeostasis: Doa1 loss abolished damage-induced PCNA monoubiquitination and reduced H2B ubiquitination, revealing both ubiquitin-supply and substrate-specific functions in the DNA damage response.\",\n      \"evidence\": \"Yeast doa1Δ mutant with ubiquitin immunoblotting, overexpression rescue, and epistasis with RAD6/RAD18/BRE1\",\n      \"pmids\": [\"16705165\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"H2B ubiquitination defect not rescued by ubiquitin overexpression—mechanism unknown\", \"Not tested in mammalian cells\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"The PFU domain was shown to bind the endosomal sorting factor Hse1/STAM independently of ubiquitin binding, placing PLAA directly in the MVB sorting pathway—a function distinct from its ubiquitin-supply role.\",\n      \"evidence\": \"Direct pulldown, site-directed mutagenesis separating Hse1-binding from ubiquitin-binding residues, GFP-Cps1 cargo missorting, and genetic epistasis with vps27Δ in yeast\",\n      \"pmids\": [\"18508771\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mammalian STAM–PLAA interaction not validated\", \"Structural basis of PFU–SH3 interaction not yet determined at this time\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"The crystal structure of the PUL domain bound to the p97 C-terminal peptide revealed the Armadillo-repeat architecture and the critical p97-Tyr805 burial, and mutagenesis proved this interface is functionally required for a subset of ubiquitin-pathway processes.\",\n      \"evidence\": \"X-ray crystallography of PUL–p97 complex; Doa1 PUL point mutants with in vivo complementation in yeast\",\n      \"pmids\": [\"19887378\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length PLAA–p97 hexamer complex structure not resolved\", \"Which mammalian p97-dependent processes specifically require the PUL interface was not tested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Quantitative biophysics (ITC, SAXS) of the PFU–Hse1/SH3 interaction defined ~5 µM affinity and identified critical residues (Doa1-Asn438, Hse1-Trp254), separating this interface from ubiquitin binding at Phe434.\",\n      \"evidence\": \"ITC affinity measurement, SAXS molecular envelope, site-directed mutagenesis in yeast\",\n      \"pmids\": [\"24607902\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Solution structure from SAXS is low-resolution compared to crystallography\", \"Functional consequence of affinity perturbation not tested in vivo\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Two studies established PLAA as a p97 cofactor in organelle-specific quality control: (1) at damaged lysosomes, PLAA/UBXD1/YOD1 selectively remove K48-ubiquitin to license autophagic clearance; (2) at mitochondria, Doa1/PLAA recruits ubiquitinated outer-membrane substrates to Cdc48 for mitochondria-associated degradation.\",\n      \"evidence\": \"siRNA knockdown, ubiquitin-linkage antibodies, lysosomal damage assay in mammalian cells (ELDR); genetic screen, Co-IP with ubiquitinated mitochondrial substrates, oxidative stress survival in yeast (MAD)\",\n      \"pmids\": [\"27753622\", \"27044889\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for PLAA selectivity toward K48- vs K63-ubiquitin chains not determined\", \"Whether PLAA functions in MAD in mammalian cells not tested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Biallelic PLAA mutations in humans caused progressive neurodegeneration with K63-polyubiquitin accumulation and impaired synaptic vesicle recycling, establishing PLAA as essential for ubiquitin-dependent endolysosomal degradation at the synapse and linking it to Mendelian neurodevelopmental disease.\",\n      \"evidence\": \"Human patient genetics plus hypomorphic mouse Plaa mutant with electrophysiology, ubiquitin-conjugate profiling, and synaptic vesicle assays\",\n      \"pmids\": [\"28413018\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise synaptic substrates whose accumulation drives pathology not identified\", \"Whether disease mechanism is p97-dependent or involves PLAA's other interactions not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"In ovarian cancer cells, PLAA was shown to promote ubiquitin-mediated degradation of METTL3, thereby reducing m6A modification and stability of TRPC3 mRNA and suppressing metastasis—linking PLAA's ubiquitin-adaptor function to epitranscriptomic regulation.\",\n      \"evidence\": \"PLAA knockdown/overexpression, ubiquitination assays, m6A-seq, TRPC3 stability assay, orthotopic xenograft model\",\n      \"pmids\": [\"35869392\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether PLAA promotes METTL3 degradation via p97 not tested\", \"Generalizability beyond ovarian cancer unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"De novo PUL-domain missense variants in children with autism and intellectual disability were shown to reduce PLAA–p97 binding in vitro, extending the disease spectrum and confirming that the p97 interaction is critical for neurodevelopment.\",\n      \"evidence\": \"Exome sequencing, computational structural modeling, in vitro PLAA–p97 binding assay with mutant proteins\",\n      \"pmids\": [\"38650658\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No cellular or animal model validation of these specific variants\", \"Whether variants also affect other PLAA interactions (e.g., PFU-mediated) not assessed\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"A previously unrecognized function was uncovered: PLAA's intrinsically disordered region recruits the mRNA decapping factor DCAP-1 to P-bodies, a role entirely separable from its PFU/PUL-dependent ubiquitin-trafficking functions, revealing that PLAA regulates the proteome through both protein degradation and mRNA regulation.\",\n      \"evidence\": \"Proteome-scale mass spectrometry, direct pulldown of UFD-3–DCAP-1, P-body imaging, IDR deletion mutants, and MVB sorting assays in C. elegans\",\n      \"pmids\": [\"40560612\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mammalian PLAA–DCP1 interaction not validated\", \"Whether IDR-mediated P-body function is conserved in vertebrates unknown\", \"Mechanism by which IDR recruits DCAP-1 (direct binding surface) not structurally defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: (1) how PLAA distinguishes K48- from K63-linked ubiquitin chains at damaged organelles; (2) whether the PLA2-activating and p97-adaptor functions operate in the same or distinct physiological contexts; (3) the identity of critical synaptic substrates whose accumulation drives neurodegeneration; and (4) whether PLAA's P-body regulatory function via its IDR is conserved in mammals.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No ubiquitin-chain selectivity mechanism defined\", \"PLA2 activation vs. p97 adaptor function relationship unresolved\", \"Full-length PLAA structure lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 5, 7]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [9, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 10]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [3, 14]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 2, 7, 12]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"complexes\": [\n      \"p97/VCP-PLAA-UBXD1-YOD1 (ELDR complex)\",\n      \"Cdc48-Ufd1-Npl4-Doa1 complex\",\n      \"Wss1-Cdc48-Doa1 ternary complex\"\n    ],\n    \"partners\": [\n      \"VCP\",\n      \"UBXD1\",\n      \"YOD1\",\n      \"STAM\",\n      \"DCAP1\",\n      \"METTL3\",\n      \"PDIA3\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}