{"gene":"PARD3","run_date":"2026-06-10T05:19:53","timeline":{"discoveries":[{"year":1995,"finding":"PAR-3 protein is asymmetrically distributed at the periphery of the zygote and asymmetrically dividing blastomeres in C. elegans. PAR-3 is required for proper localization of PAR-1, and par-2 activity is required for proper localization of PAR-3, establishing a mutual epistatic relationship between PAR-2, PAR-3, and PAR-1 in controlling embryonic polarity and cleavage spindle orientation.","method":"Immunolocalization, genetic epistasis analysis using par mutants","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct protein localization combined with genetic epistasis, foundational study replicated across multiple subsequent papers","pmids":["8521491"],"is_preprint":false},{"year":1995,"finding":"par-3 and par-2 act in concert during the first cell cycle to affect asymmetric modification of the cytoskeleton; par-3 is epistatic to par-2 in controlling spindle orientation in C. elegans embryos.","method":"Genetic epistasis analysis, temperature-shift experiments with double mutants","journal":"Genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with double mutants, replicated across labs","pmids":["7713417"],"is_preprint":false},{"year":1996,"finding":"par-6 acts upstream of par-3 by localizing or maintaining the PAR-3 protein at the cell periphery in C. elegans embryos; loss-of-function par-6 mutations act as dominant bypass suppressors of par-2 loss-of-function mutations.","method":"Genetic epistasis, immunolocalization of PAR-3 in par-6 mutant embryos","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with immunolocalization, independently replicated","pmids":["8898226"],"is_preprint":false},{"year":1998,"finding":"ASIP (mammalian PAR-3 homolog) directly binds to atypical PKC isoforms (PKCλ/PKCζ) via PDZ domains and colocalizes with PKCλ to the tight junction complex in epithelial cells, suggesting a conserved role for the PAR-3/aPKC complex in cell polarity.","method":"Co-immunoprecipitation, immunoelectron microscopy, sequence analysis","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP with localization data, independently replicated in multiple subsequent papers","pmids":["9763423"],"is_preprint":false},{"year":1998,"finding":"In C. elegans, aPKC (PKC-3) directly interacts with PAR-3, co-localizes with PAR-3 to the anterior periphery of asymmetrically dividing cells, and shows mutual dependence on PAR-3 (and par-6) for correct localization. PKC-3 depletion by RNAi causes Par-like polarity phenotypes.","method":"In vitro binding assay, RNA interference, immunolocalization","journal":"Development","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro binding plus RNAi phenocopy plus co-localization, replicated across organisms","pmids":["9716526"],"is_preprint":false},{"year":1998,"finding":"Drosophila Bazooka (PAR-3 ortholog) is required for establishment of apico-basal polarity in epithelia and neuroblasts; Baz protein is restricted to the apical cortical cytoplasm of epithelial cells and neuroblasts, and bazooka mutants show defective spindle orientation.","method":"Loss-of-function genetics, immunolocalization","journal":"Current biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function with defined polarity phenotype, replicated","pmids":["9889099"],"is_preprint":false},{"year":1999,"finding":"Bazooka/PAR-3 directly binds Inscuteable in vitro and in vivo, forming a complex that also contains Staufen; Bazooka is required for asymmetric apical localization of Inscuteable in Drosophila neuroblasts, which in turn controls spindle orientation and Numb/Miranda asymmetric localization.","method":"In vitro binding assay, in vivo co-immunoprecipitation, genetic loss-of-function (maternal/zygotic null)","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted direct binding plus genetic epistasis plus phenotypic readout, independently replicated","pmids":["10591216","10591217"],"is_preprint":false},{"year":1999,"finding":"PAR-6 is a PDZ-domain protein that colocalizes with PAR-3 in C. elegans embryos; PAR-3 and PKC-3 activity are required for peripheral localization of PAR-6, supporting a trimeric PAR-3/PAR-6/PKC-3 complex.","method":"Molecular cloning, immunolocalization, genetic analysis","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — immunolocalization with genetic dependency analysis, replicated","pmids":["9834192"],"is_preprint":false},{"year":2000,"finding":"Mammalian mPAR-3 and mPAR-6 associate through their PDZ domains. mPAR-6 binds Cdc42/Rac1 GTPases. Both mPAR-3 and mPAR-6 bind independently to atypical PKC isoforms. In vitro, mPAR-3 acts as both a substrate and an inhibitor of aPKC, suggesting a scaffolding function coordinating signaling proteins for cell polarity.","method":"Co-immunoprecipitation, in vitro kinase assay, PDZ domain binding assays","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro enzymatic assay + co-IP + domain mapping, independently replicated","pmids":["10934475"],"is_preprint":false},{"year":2000,"finding":"Drosophila aPKC (DaPKC) directly binds to Bazooka/PAR-3, and both proteins are mutually dependent for correct apical localization. Loss-of-function of DaPKC causes loss of apico-basal polarity, multilayering of epithelia, mislocalization of Inscuteable, and abnormal spindle orientation in neuroblasts.","method":"Direct binding assay, genetic loss-of-function, immunolocalization","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct binding + genetic loss-of-function with multiple orthogonal phenotypic readouts","pmids":["10995441"],"is_preprint":false},{"year":2001,"finding":"ASIP/PAR-3 directly associates with junctional adhesion molecule (JAM) in vitro and in vivo through its PDZ domains. Overexpression of truncated JAM lacking the extracellular domain disrupts ASIP/PAR-3 localization at intercellular junctions, suggesting JAM tethers the PAR-3/aPKC complex to tight junctions.","method":"In vitro binding assay, co-immunoprecipitation, overexpression studies in fibroblasts and CHO cells","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro binding confirmed by reciprocal co-IP with functional localization consequence, independently replicated","pmids":["11447115"],"is_preprint":false},{"year":2001,"finding":"ZO-1 directly binds JAM at its PDZ3 domain, while PAR-3 directly binds the C-terminus of JAM (but not claudins). A model is proposed where JAM aggregates tethered to claudin-based strands through ZO-1 recruit PAR-3 to tight junctions.","method":"In vitro binding assays, immunofluorescence, immunoreplica electron microscopy","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in vitro binding with specificity controls, replicated by Ebnet et al.","pmids":["11489913"],"is_preprint":false},{"year":2002,"finding":"aPKC preferentially phosphorylates PAR-3 at serine-827 in vitro and in vivo; this phosphorylation reduces the stability of the PAR-3–aPKC interaction. Overexpression of PAR-3 S827A (non-phosphorylatable) causes defects in cell-cell contact-induced cell polarization of MDCK cells, similar to dominant-negative aPKC.","method":"In vitro kinase assay, phospho-specific antibody, MDCK overexpression studies","journal":"Genes to cells","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro phosphorylation + site-specific mutagenesis + in vivo phospho-antibody validation + functional consequence","pmids":["12390250"],"is_preprint":false},{"year":2002,"finding":"Overexpression of ASIP/PAR-3, but not a deletion mutant lacking the aPKC-binding sequence, promotes cell-cell contact-induced tight junction formation in MDCK cells. PAR-3 Ser827 is phosphorylated at the most apical tip of cell-cell contacts during initial tight junction formation, implicating PAR-3/aPKC interaction in this process.","method":"Inducible overexpression, transepithelial resistance measurement, occludin insolubilization assay, immunofluorescence","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — domain deletion analysis with functional readout, replicated in multiple papers","pmids":["12045219"],"is_preprint":false},{"year":2003,"finding":"PAR-3 directly binds nectin-1 and nectin-3 (but not nectin-2) through its first PDZ domain at neuroepithelial adherens junctions; PAR-3 and nectin-1/-3 co-immunoprecipitate from embryonic mouse brain and recombinant proteins bind stoichiometrically.","method":"Co-immunoprecipitation from mouse brain, recombinant protein binding assay, PDZ domain mapping","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — stoichiometric binding reconstituted in vitro + co-IP in vivo with domain mapping","pmids":["12515806"],"is_preprint":false},{"year":2003,"finding":"PAR-1 phosphorylates Bazooka/PAR-3 on two conserved serines (generating 14-3-3 binding sites), which inhibits Bazooka oligomerization and binding to aPKC. This excludes Bazooka from lateral membranes in epithelia; a Bazooka lacking PAR-1 phosphorylation/14-3-3 binding sites forms ectopic lateral complexes, disrupting polarity.","method":"In vitro kinase assay, genetic epistasis, site-directed mutagenesis, immunolocalization","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay + mutagenesis + genetic epistasis with multiple polarity phenotypes","pmids":["14675534"],"is_preprint":false},{"year":2003,"finding":"The conserved N-terminal domain CR1 of PAR-3 mediates self-association/oligomerization in vitro and in vivo. CR1 deletion disrupts localization of aPKC and PAR-6 as well as PAR-3 and delays formation of functional tight junctions. Sequence 937-1024 is also required for recruitment to the apical side of cell-cell contact.","method":"In vitro and in vivo oligomerization assays, MDCK overexpression, transepithelial resistance","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro biochemical assay + domain mutagenesis + functional consequences in epithelial cells","pmids":["12756256"],"is_preprint":false},{"year":2003,"finding":"Bazooka CR1 domain mediates oligomerization in vitro and in vivo (predicted by structural fold comparison to a bacterial oligomerization domain); deletion of CR1 disrupts BAZ localization in epithelial cells and germline and strongly impairs BAZ function in epithelial polarity.","method":"Sequence-structure comparison (FUGUE), biochemical oligomerization assay, Drosophila genetics","journal":"Current biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — biochemical assay + genetic loss-of-function with polarity phenotype","pmids":["12906794"],"is_preprint":false},{"year":2003,"finding":"JAM-2 and JAM-3 directly associate with PAR-3 through its first PDZ domain; junctional localization of JAM-2 is regulated by serine phosphorylation, and JAM-2 clustering at cell-cell contacts recruits endogenous PAR-3 and ZO-1.","method":"In vitro binding assay, co-immunoprecipitation, ectopic expression in CHO cells","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct binding assay with domain mapping + functional recruitment experiment","pmids":["12953056"],"is_preprint":false},{"year":2003,"finding":"Genetic epistasis in Drosophila shows bazooka functions redundantly with crumbs/stardust to support apical polarity at mid-to-late embryogenesis; crb and lgl pathways function competitively to define apical and basolateral surfaces.","method":"Drosophila genetic epistasis, double and triple mutant analysis","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — rigorous genetic epistasis in multiple mutant combinations, replicated","pmids":["12510193"],"is_preprint":false},{"year":2004,"finding":"PAR-3 directly interacts with KIF3A (a plus-end-directed microtubule motor), and aPKC can associate with KIF3A through PAR-3. Expression of dominant-negative PAR-3 and KIF3A fragments that disrupt PAR-3–KIF3A binding inhibited accumulation of PAR-3 and aPKC at the neurite tip and abolished neuronal polarity in cultured hippocampal neurons.","method":"Co-immunoprecipitation, dominant-negative fragment expression, immunofluorescence in hippocampal neurons","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP + dominant-negative functional perturbation with defined neuronal polarity readout","pmids":["15048131"],"is_preprint":false},{"year":2005,"finding":"Par-3 depletion in mammalian epithelial cells profoundly disrupts tight junction assembly; Rac is constitutively activated in cells lacking Par-3. Par-3 directly binds the Rac-GEF Tiam1 through its C-terminal region; knockdown of Tiam1 enhances tight junction formation in Par-3-depleted cells, revealing Par-3 as a spatial regulator of Rac activity via Tiam1.","method":"siRNA knockdown, dominant-negative Rac rescue, direct binding assay, tight junction formation assay","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct binding + siRNA knockdown + rescue experiments + Rac activity measurement with multiple orthogonal methods","pmids":["15723052"],"is_preprint":false},{"year":2005,"finding":"PAR-3 directly interacts with STEF/Tiam1 (Rac-specific GEFs) and forms a complex with PAR-3–aPKC–PAR-6–Cdc42-GTP. Disruption of PAR-3–STEF binding inhibits Cdc42-induced lamellipodia. PAR-3 is required for Cdc42-induced Rac activation. In hippocampal neurons, STEF accumulates at the axon tip colocalizing with PAR-3, suggesting a Cdc42–PAR-6–PAR-3–STEF/Tiam1–Rac signaling cascade in neuronal polarity.","method":"Co-immunoprecipitation, dominant-negative fragment expression, Rac GTPase activity assay, immunofluorescence","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct binding + complex reconstitution + Rac activity assay + functional neuronal readout, independent replication of PAR-3/Tiam1 interaction","pmids":["15723051"],"is_preprint":false},{"year":2005,"finding":"Drosophila Bazooka directly binds the lipid phosphatase PTEN in vitro and in vivo; PTEN colocalizes with Baz in the apical cortex of epithelia and neuroblasts. Pten mutant phenotypes include defects in posterior germ plasm determinant localization and actin-dependent nuclear movements.","method":"In vitro binding assay, co-immunoprecipitation, genetic loss-of-function","journal":"Development","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro binding + in vivo co-IP + colocalization + genetic phenotype","pmids":["15743877"],"is_preprint":false},{"year":2006,"finding":"Par-3 directly binds p75 neurotrophin receptor (p75NTR) and recruits it to the axon-glial junction in Schwann cells; disruption of Par-3 localization by overexpression or knockdown inhibits myelination, defining a Par-3/p75NTR complex necessary for Schwann cell myelination.","method":"Direct binding assay, co-immunoprecipitation, overexpression and knockdown in Schwann cells, myelination assay","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct binding + co-IP + loss- and gain-of-function with defined myelination readout","pmids":["17082460"],"is_preprint":false},{"year":2006,"finding":"Par-3 depletion elevates phosphorylated cofilin levels; Par-3 directly binds LIMK2 (but not LIMK1) and inhibits LIMK2 kinase activity in vitro. A non-phosphorylatable cofilin mutant partially rescues tight junction assembly in Par-3-depleted cells. This identifies LIMK2 as a novel Par-3 target linking actin dynamics to tight junction assembly.","method":"siRNA knockdown, direct binding assay, in vitro kinase assay, rescue experiments","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase inhibition + direct binding with specificity + siRNA rescue experiment","pmids":["16505165"],"is_preprint":false},{"year":2006,"finding":"PAR-3 is necessary for normal dendritic spine development; depletion causes multiple filopodia/lamellipodia-like protrusions (similar to activated Rac). PAR-3 spatially restricts TIAM1 to dendritic spines by direct binding, thereby modulating Rac-GTP levels during spine morphogenesis.","method":"siRNA knockdown, direct binding assay, live imaging, Rac activity assay in hippocampal neurons","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding + siRNA with defined spine morphogenesis readout + Rac activity measurement","pmids":["16474385"],"is_preprint":false},{"year":2006,"finding":"MARK2/PAR-1 functions downstream of the PAR-3/PAR-6/aPKC complex in hippocampal neuron polarity; aPKC phosphorylates MARK2 at T595, and an MARK2 mutant not responsive to aPKC is not rescued by the PAR-3/PAR-6/aPKC complex. Genetic epistasis places MARK2 downstream of aPKC in neuronal polarization.","method":"siRNA knockdown, ectopic expression, epistasis analysis, phosphorylation assays in hippocampal neurons","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis + phosphorylation site mutagenesis + multiple neuronal polarity readouts","pmids":["16717194"],"is_preprint":false},{"year":2007,"finding":"PAR-3 directly interacts with KIF3A-containing KIF3 complex; the PAR-3/KIF3 association mediates transport of PAR-3 to the distal tip of the axon. Disruption of this interaction impairs axon formation and neuronal polarity in hippocampal neurons.","method":"Co-immunoprecipitation, dominant-negative expression, immunofluorescence","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP + dominant-negative perturbation + defined neuronal polarity readout","pmids":["15048131"],"is_preprint":false},{"year":2007,"finding":"Numb binds to PAR-3 and is phosphorylated by aPKC, causing release from clathrin-coated structures; PAR-3/aPKC-mediated polarized phosphorylation of Numb contributes to directional integrin endocytosis and cell migration toward integrin substrates.","method":"RNAi, co-immunoprecipitation, integrin endocytosis assay, cell migration assay","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding + phosphorylation + functional migration and endocytosis readouts","pmids":["17609107"],"is_preprint":false},{"year":2007,"finding":"The second PDZ domain of Par-3 binds phosphatidylinositol lipid membranes with high affinity; Par-3 PDZ2 membrane binding capacity is critical for epithelial cell polarization. The third PDZ domain of Par-3 directly binds PTEN. Concatenation of PIP-binding PDZ2 and PTEN-binding PDZ3 enables Par-3 to integrate phosphoinositide signaling.","method":"Biochemical lipid-binding assays, structural characterization, cell polarization assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — biochemical and structural characterization with functional validation in epithelial cells","pmids":["18082612"],"is_preprint":false},{"year":2007,"finding":"Par-3 cooperates with afadin in forming adherens and tight junctions; Par-3 promotes the association of afadin with nectin, while afadin is not required for Par-3–nectin association. Par-3 and afadin cooperatively regulate AJ and TJ formation downstream of nectin-based cell-cell adhesion.","method":"Par-3 knockdown in MDCK cells, co-immunoprecipitation, immunofluorescence","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown + co-IP, single lab","pmids":["17606991"],"is_preprint":false},{"year":2008,"finding":"Rho-kinase/ROCK phosphorylates PAR-3 at Thr833, disrupting its interaction with aPKC and PAR-6 but not with Tiam2/STEF. Phospho-PAR-3 is observed in the leading edge of migrating cells; PAR-3 knockdown impairs cell migration and PAR-3-mediated Rac1 activation, which are recovered with siRNA-resistant PAR-3 but not with a phospho-mimic mutant.","method":"In vitro kinase assay, site-directed mutagenesis, siRNA knockdown, rescue experiments, Rac1 activity assay","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay + mutagenesis + siRNA rescue + Rac activity assay with defined site specificity","pmids":["18267089"],"is_preprint":false},{"year":2008,"finding":"Protein phosphatase PP1 (predominantly PPα isoform) binds Par-3 and retains phosphatase activity; PP1α specifically dephosphorylates Par-3 at Ser-144, Ser-824, and Ser-885 (identified by quantitative mass spectrometry/MRM). PP1α regulates 14-3-3 and aPKCζ binding to Par-3. Catalytically inactive PP1α severely delays tight junction formation in MDCK cells.","method":"Co-immunoprecipitation, quantitative mass spectrometry (MRM), phosphatase activity assay, tight junction formation assay","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 1 / Strong — quantitative mass spectrometry identification of phosphosites + phosphatase activity assay + functional consequence","pmids":["18641122"],"is_preprint":false},{"year":2008,"finding":"Crystal structures of Par-3 PDZ3 in free and PTEN-peptide-bound forms reveal that Par-3 PDZ3 binds PTEN via two discrete sites: a canonical PDZ-ligand site and a distal charge-charge interaction site. Par-3 PDZ3-PTEN binding is required for enrichment of PTEN at junctional membranes of MDCK cells, and junctional PTEN is specifically required for cell polarization.","method":"X-ray crystallography, mutagenesis, MDCK cell polarization assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure + mutagenesis + functional validation in cells","pmids":["18550519"],"is_preprint":false},{"year":2009,"finding":"PAR-3 knockdown in MDCK cells retards apical protein delivery; PAR-3 S827/829A mutant (unable to interact with aPKC) fails to rescue PAR-3 knockdown defects in apical membrane development, demonstrating that formation of the PAR-3–aPKC–PAR-6 complex is essential for apical domain development. Tight junction maturation does not require the aPKC–PAR-3 interaction.","method":"siRNA knockdown, point mutant rescue, 2D and 3D MDCK culture, immunofluorescence","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — siRNA + separation-of-function mutagenesis in multiple culture systems","pmids":["19401335"],"is_preprint":false},{"year":2009,"finding":"PP2A binds Baz/PAR-3 via its structural A subunit and dephosphorylates Baz at the conserved serine 1085 (PAR-1 phosphorylation site), antagonizing PAR-1 kinase activity. Loss of PP2A function in Drosophila neuroblasts causes complete reversal of polarity; overexpression of PAR-1 or Baz or 14-3-3 mutation causes the same phenotype, placing PP2A activity in the PAR-1/Baz phosphorylation balance determining NB polarity.","method":"Co-immunoprecipitation, phospho-specific antibodies, genetic epistasis in Drosophila","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP with phospho-specific readout + genetic epistasis with multiple allele combinations","pmids":["19531360"],"is_preprint":false},{"year":2009,"finding":"RalA-regulated association between the exocyst complex and PAR-3 increases during early stages of neuronal polarization. Depletion of Sec6, Sec8, or Exo84 exocyst subunits leads to unpolarized neurons, and constitutively active RalA unable to bind the exocyst has no effect on neuronal polarization.","method":"Co-immunoprecipitation, siRNA knockdown, overexpression in cultured neurons","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — co-IP interaction identified, single lab, single method for the PAR-3/exocyst interaction","pmids":["19383721"],"is_preprint":false},{"year":2010,"finding":"aPKC phosphorylation of Bazooka disrupts the Baz/aPKC interaction and excludes Baz from the apical domain in Drosophila epithelia. Additionally, the Crumbs complex prevents Baz/PAR-6 interaction in epithelia. Without Crumbs or aPKC phosphorylation, mislocalized Baz recruits adherens junction components apically, expanding the lateral domain at the expense of the apical domain.","method":"Phospho-mutant analysis, genetic epistasis, immunolocalization in Drosophila epithelia","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — phospho-mutant + genetic epistasis with multiple readouts, rigorously characterized","pmids":["20434988"],"is_preprint":false},{"year":2010,"finding":"Rho-kinase is required for planar polarized distribution of Bazooka/PAR-3 in Drosophila embryo intercalating cells; activated Rho-kinase is sufficient to exclude Baz from the cortex. Rho-kinase can phosphorylate the Baz C-terminal domain and inhibit its interaction with phosphoinositide membrane lipids, providing a mechanism for regulating Baz cortical association.","method":"Genetic loss-of-function, constitutively active expression, in vitro phosphorylation, lipid-binding assays","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay + lipid-binding inhibition + genetic loss- and gain-of-function","pmids":["20833361"],"is_preprint":false},{"year":2010,"finding":"The conserved C-terminal region of Bazooka/PAR-3 (not PDZ domains) binds phosphoinositide lipids directly and mediates cortical localization of Baz by direct plasma membrane interaction in multiple Drosophila cell types. PDZ domains are dispensable for correct Baz localization.","method":"Structure-function analysis, lipid-binding assay, Drosophila genetics in multiple cell types","journal":"Current biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct lipid-binding assay + domain deletion analysis in four cell types","pmids":["20303268"],"is_preprint":false},{"year":2010,"finding":"ASPP2 directly binds Par-3, and the junctional localization of ASPP2 and Par-3 is interdependent. ASPP2 controls apical/junctional Par-3 localization without affecting Par-3 expression or Par-3/aPKCλ binding; disruption leads to neuroblastic rosette formation and impaired neural progenitor proliferation in vivo.","method":"Co-immunoprecipitation, in vivo mouse CNS analysis, immunofluorescence","journal":"Developmental cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP + in vivo phenotype with localization analysis, single lab","pmids":["20619750"],"is_preprint":false},{"year":2010,"finding":"Sirt2 deacetylates Par-3 in Schwann cells; deacetylation of Par-3 by Sirt2 decreases the activity of aPKC, thereby regulating myelin formation. Transgenic mice lacking or overexpressing Sirt2 specifically in Schwann cells show delays in myelin formation.","method":"In vivo genetic mouse model, deacetylation assay, aPKC activity assay","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct biochemical deacetylation assay + in vivo transgenic mouse with defined myelination readout","pmids":["21949390"],"is_preprint":false},{"year":2010,"finding":"Siah E3 ubiquitin ligase promotes proteasomal degradation of Pard3A in cerebellar granule neurons. Pard3A gain of function and Siah loss of function induce precocious radial migration. Pard3A promotes adhesive interactions for germinal zone exit by recruiting epithelial tight junction adhesion molecule C to the neuronal cell surface.","method":"In vivo gain-of-function and loss-of-function, ubiquitin ligase assay, time-lapse imaging, cell surface recruitment assay","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic manipulation + biochemical ubiquitination + live imaging with adhesion readout","pmids":["21109632"],"is_preprint":false},{"year":2010,"finding":"PAR-3 mediates the initial clustering of E-cadherin and other adherens junction/polarity proteins into cortical foci that then travel and accumulate apically during C. elegans intestinal epithelial cell polarization. PAR-3 is required to assemble E-cadherin into foci and for foci to accumulate at the apical surface.","method":"Targeted protein degradation strategy in C. elegans, live imaging","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — targeted protein degradation with live imaging showing dynamic clustering and transport","pmids":["20431121"],"is_preprint":false},{"year":2010,"finding":"Baz directly interacts with Stardust (Sdt) via Sdt's PDZ domain and the aPKC phosphorylation site region of Baz; aPKC phosphorylation of Baz causes dissociation of the Baz-Sdt complex. Non-phosphorylatable Baz overexpression blocks Sdt dissociation and causes crb/sdt-like polarity phenotypes.","method":"In vitro binding assay, phospho-mutant analysis, Drosophila genetics","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro binding + phospho-mutant analysis + genetic phenotype","pmids":["20819933"],"is_preprint":false},{"year":2012,"finding":"Crystal structure of PKCι in complex with a Par-3 substrate peptide at 2.4 Å reveals that the Par-3 peptide binds an elongated groove formed by N- and C-lobes of the kinase domain. Structural analysis together with mutagenesis identifies a hydrophobic pocket unique to aPKC isozymes and a consensus aPKC substrate recognition sequence. The pseudosubstrate sequence of PKCι directly binds and inhibits kinase activity similarly to the Par-3 peptide.","method":"X-ray crystallography, mutagenesis, in vitro kinase assay","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure at 2.4 Å + mutagenesis + biochemical validation","pmids":["22579248"],"is_preprint":false},{"year":2013,"finding":"Dynamic microtubules positioned along the dorso-ventral axis inhibit RhoGEF2, reducing Rho-kinase membrane recruitment and increasing a mobile E-cadherin pool complexed with Bazooka/PAR-3 (measured by FRAP). This mobile E-cadherin-Bazooka complex prevents multicellular rosette formation and cell motility across segment borders.","method":"FRAP, genetic analysis, immunofluorescence in Drosophila embryos","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — FRAP + co-complex identification + genetic perturbation, single lab","pmids":["23751496"],"is_preprint":false},{"year":2013,"finding":"Loss of Par3/Bazooka from cell-cell junctions at epithelial edges during Drosophila wound healing results in localized PIP3 accumulation, which promotes actin protrusion formation; depleting PIP3 causes defective epithelial closure. This establishes a direct molecular link between Par3 loss, PI3K signaling, and actin protrusion.","method":"Drosophila genetics, wound healing assay, dorsal closure assay, PIP3 biosensor imaging","journal":"Development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic perturbation + lipid biosensor imaging + functional closure readout, single lab","pmids":["23318638"],"is_preprint":false},{"year":2014,"finding":"PI(4,5)P2, produced by the PI4P5K SKTL, is required to maintain apical PAR-3/Bazooka localization at the plasma membrane; reduction of PI(4,5)P2 causes loss of apical Baz, disassembly of adherens junctions, actin reorganization, and apical constriction similar to EMT. Loss of polarized PAR-3 distribution is sufficient to induce these cell shape changes.","method":"PI4P5K genetic inactivation, PI(4,5)P2 reporters, immunofluorescence, Drosophila follicular epithelium","journal":"Current biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic approach + lipid reporter + defined PAR-3 localization consequence, single lab","pmids":["24768049"],"is_preprint":false},{"year":2015,"finding":"PARD3 promotes interaction between PP1A and LATS1, inducing LATS1 dephosphorylation and inactivation, leading to dephosphorylation and activation of TAZ. Cytoplasmic (but not tight junction complex-associated) PARD3 is responsible for TAZ regulation, providing a mechanism by which PARD3 modulates Hippo pathway signaling.","method":"Co-immunoprecipitation, phosphorylation assays, domain separation experiments","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP of ternary complex + phosphorylation status measurement, single lab","pmids":["26116754"],"is_preprint":false},{"year":2015,"finding":"Bazooka provides a cortical platform for correct centrosome orientation in Drosophila male germline stem cells; Baz-centrosome association is the key event monitored by the centrosome orientation checkpoint (COC) to ensure productive asymmetric cell division.","method":"Drosophila genetics, live imaging, centrosome orientation assay","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic analysis + live imaging, single lab","pmids":["25793442"],"is_preprint":false},{"year":2015,"finding":"PAR-3 regulates the protein expression of Girdin (a GEF for Gαi subunits) at the transcriptional level by cooperating with the AP-2 transcription factor. PAR-3 physically interacts with Girdin; Girdin together with Gαi3 controls tight junction formation, apical domain development, and actin organization downstream of PAR-3.","method":"siRNA knockdown, co-immunoprecipitation, transcriptional reporter assay, MDCK cell polarity assay","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP + transcriptional reporter + siRNA with polarity readout, single lab","pmids":["25977476"],"is_preprint":false},{"year":2018,"finding":"PARD3-deficient radial glial progenitors (RGPs) exhibit stage-dependent abnormal switches in division mode; simultaneous removal of YAP and TAZ suppresses cortical enlargement and heterotopia formation in PARD3-null cortex. This places PARD3 upstream of HIPPO pathway effectors in controlling RGP division mode and cortical development.","method":"In vivo conditional knockout in mouse cortex, epistasis with YAP/TAZ double knockout, live imaging","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo conditional KO + genetic epistasis with YAP/TAZ double KO + live imaging","pmids":["29899142"],"is_preprint":false},{"year":2018,"finding":"PAR-3 acts as an essential gatekeeper of GSK3β activity in response to laminar blood flow in endothelial cells; flow-induced spatial distribution of PAR-3/aPKCλ and aPKCλ/GSK3β complexes controls local GSK3β activity and regulates endothelial planar polarity. PAR-3/aPKCλ spatial information is required for flow-dependent polarity but not for flow-induced anti-inflammatory response.","method":"Co-immunoprecipitation, kinase activity assays, endothelial cell flow experiments, siRNA knockdown","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP of ternary complexes + kinase activity + flow-based functional assay, single lab","pmids":["30018153"],"is_preprint":false}],"current_model":"PARD3 (PAR-3/Bazooka) is a conserved PDZ-domain scaffold protein that assembles the core PAR-3/PAR-6/aPKC polarity complex; it localizes to apical junctional membranes via direct phosphoinositide (PI(4,5)P2) lipid binding and oligomerization through its CR1 domain, recruits aPKC (which phosphorylates PAR-3 at Ser-827/833 to dynamically regulate complex stability and localization), interfaces with junctional transmembrane proteins JAM and nectin to anchor the complex at tight junctions, spatially restricts the Rac-GEF Tiam1/STEF to control Rac activity and actin dynamics, directly binds PTEN to integrate phosphoinositide signaling, is phosphorylated by PAR-1/MARK at conserved serines to generate 14-3-3 binding sites that exclude it from lateral membranes (antagonized by PP2A and PP1), is phosphorylated by Rho-kinase to disrupt PAR complex formation, is dephosphorylated by PP1α at multiple sites to maintain complex integrity, and is targeted for proteasomal degradation by the Siah E3 ligase and transcriptional downregulation by miR-491-5p; collectively these mechanisms position PAR-3 as a master organizer of apicobasal and planar cell polarity, tight junction assembly, asymmetric cell division, neuronal axon specification, and Schwann cell myelination, and modulate Hippo/LATS1/TAZ signaling."},"narrative":{"mechanistic_narrative":"PARD3 (PAR-3/ASIP/Bazooka) is an evolutionarily conserved multi-PDZ scaffold protein that serves as the master organizer of cell polarity, partitioning membrane domains during asymmetric cell division, epithelial apicobasal polarization, and neuronal axon specification [PMID:8521491, PMID:9889099]. It nucleates the core polarity machinery by directly binding atypical PKC (PKCλ/ζ) and PAR-6 through its PDZ domains, assembling the trimeric PAR-3/PAR-6/aPKC complex that depends mutually on each subunit for cortical localization [PMID:9763423, PMID:9834192, PMID:10934475]. PAR-3 is targeted to apical junctional membranes by two cooperating mechanisms: oligomerization through its conserved N-terminal CR1 domain [PMID:12756256, PMID:12906794], and direct phosphoinositide lipid binding by its PDZ2 domain and conserved C-terminal region [PMID:18082612, PMID:20303268]. There it is tethered to tight and adherens junctions through direct association with the transmembrane adhesion proteins JAM and nectin via its first PDZ domain [PMID:11447115, PMID:11489913, PMID:12515806]. PAR-3 spatially restricts the Rac-GEFs Tiam1/STEF through direct binding, thereby controlling Rac activity and actin dynamics during tight junction assembly, dendritic spine morphogenesis, and cell migration [PMID:15723052, PMID:15723051, PMID:16474385], and it concatenates phosphoinositide signaling by binding the lipid phosphatase PTEN through its third PDZ domain [PMID:18082612, PMID:18550519]. The complex is dynamically regulated by an antagonistic phosphorylation network: aPKC phosphorylates PAR-3 at Ser-827/833 to destabilize the interaction and tune localization [PMID:12390250, PMID:19401335], PAR-1/MARK phosphorylates conserved serines to generate 14-3-3 sites that exclude PAR-3 from lateral membranes [PMID:14675534], Rho-kinase phosphorylates Thr-833 to disrupt aPKC/PAR-6 binding and inhibit lipid association during migration and planar polarity [PMID:18267089, PMID:20833361], and these are counterbalanced by PP1α and PP2A dephosphorylation [PMID:18641122, PMID:19531360]. PAR-3 abundance is further controlled by Siah E3 ligase-mediated proteasomal degradation [PMID:21109632]. Through cytoplasmic promotion of PP1A–LATS1 interaction it inactivates LATS1 and activates TAZ, linking PAR-3 to Hippo/YAP-TAZ signaling and the control of neural progenitor division mode in vivo [PMID:26116754, PMID:29899142]. PAR-3 also directs neuronal polarity through KIF3 motor-mediated transport to the axon tip [PMID:15048131] and Schwann cell myelination via a Par-3/p75NTR complex [PMID:17082460].","teleology":[{"year":1995,"claim":"Established PAR-3 as an asymmetrically localized determinant of embryonic polarity, defining the founding member of the PAR polarity system and its epistatic relationships with other par genes.","evidence":"Immunolocalization and genetic epistasis with par mutants in C. elegans zygotes","pmids":["8521491","7713417"],"confidence":"High","gaps":["No molecular function or binding partners identified","Mechanism of asymmetric localization unknown"]},{"year":1998,"claim":"Identified the conserved PAR-3/aPKC interaction across species, revealing PAR-3 as a PDZ scaffold that physically couples a kinase to the polarity machinery and tethers it to tight junctions.","evidence":"Co-IP and immunoelectron microscopy in mammalian epithelia; in vitro binding and RNAi in C. elegans; loss-of-function genetics in Drosophila","pmids":["9763423","9716526","9889099"],"confidence":"High","gaps":["Stoichiometry of the complex not resolved","Functional consequence of phosphorylation not defined"]},{"year":1999,"claim":"Defined the trimeric PAR-3/PAR-6/aPKC complex and linked it to spindle orientation determinants, showing PAR-3 organizes downstream fate factors during asymmetric division.","evidence":"In vitro binding, co-IP, and genetic null analysis in C. elegans and Drosophila neuroblasts (Inscuteable/Staufen)","pmids":["10591216","10591217","9834192"],"confidence":"High","gaps":["How PAR-3 selects apical versus basal targets unknown"]},{"year":2000,"claim":"Showed PAR-3 acts as both substrate and inhibitor of aPKC and that PAR-6 bridges Cdc42/Rac1 to the complex, establishing PAR-3 as a signaling scaffold rather than a passive adaptor.","evidence":"Co-IP, PDZ domain mapping, and in vitro kinase assays of mammalian mPAR-3/mPAR-6","pmids":["10934475"],"confidence":"High","gaps":["aPKC phosphorylation sites on PAR-3 not yet mapped","Mechanism of GTPase regulation unresolved"]},{"year":2001,"claim":"Determined how the complex is anchored at junctions, showing PAR-3 directly binds JAM C-termini while ZO-1 links JAM to claudin strands, providing a structural route for tight junction recruitment.","evidence":"In vitro binding, reciprocal co-IP, and overexpression with localization readout in fibroblasts/CHO cells","pmids":["11447115","11489913"],"confidence":"High","gaps":["Whether JAM binding is sufficient for in vivo recruitment unclear"]},{"year":2002,"claim":"Identified Ser-827 as the aPKC phosphorylation site whose modification destabilizes the PAR-3–aPKC interaction, introducing dynamic regulation of complex assembly during junction formation.","evidence":"In vitro kinase assay, phospho-specific antibody, and S827A mutant rescue in MDCK cells","pmids":["12390250","12045219"],"confidence":"High","gaps":["Counteracting phosphatase not identified","Other phosphosites unknown"]},{"year":2003,"claim":"Resolved PAR-3 cortical targeting via CR1-mediated oligomerization and identified PAR-1 phosphorylation generating 14-3-3 sites that exclude PAR-3 from lateral membranes, establishing the kinase-driven spatial code for membrane domain restriction.","evidence":"Oligomerization assays, domain deletion in MDCK, in vitro kinase assay and genetic epistasis in Drosophila; nectin/JAM binding by PDZ1","pmids":["12756256","12906794","14675534","12515806","12953056","12510193"],"confidence":"High","gaps":["How oligomerization and phosphorylation are coordinated temporally unclear","Lipid-binding contribution not yet defined"]},{"year":2004,"claim":"Linked PAR-3 to directional transport by showing KIF3A motor binding delivers PAR-3/aPKC to the neurite tip, extending the polarity scaffold to neuronal axon specification.","evidence":"Co-IP and dominant-negative fragment expression in hippocampal neurons","pmids":["15048131"],"confidence":"High","gaps":["Cargo selectivity of transport not defined"]},{"year":2005,"claim":"Established PAR-3 as a spatial regulator of Rac through direct binding and restriction of the Rac-GEFs Tiam1/STEF, connecting the polarity complex to actin dynamics and tight junction assembly.","evidence":"Direct binding, siRNA knockdown, dominant-negative Rac rescue, and Rac activity assays in epithelia and neurons; PTEN binding and genetics in Drosophila","pmids":["15723052","15723051","15743877"],"confidence":"High","gaps":["Whether PAR-3 activates or sequesters Tiam1 context-dependent and unresolved"]},{"year":2006,"claim":"Expanded PAR-3 targets to LIMK2/cofilin actin regulation, p75NTR-dependent Schwann cell myelination, and dendritic spine morphogenesis, demonstrating tissue-specific deployment of the scaffold.","evidence":"In vitro kinase inhibition, direct binding, siRNA rescue in epithelia and neurons, and myelination assays in Schwann cells","pmids":["16505165","17082460","16474385","16717194"],"confidence":"High","gaps":["How PAR-3 selects different effectors across tissues not established"]},{"year":2007,"claim":"Defined the lipid-integration function of PAR-3, showing PDZ2 binds phosphoinositides while PDZ3 binds PTEN, and linked PAR-3/aPKC to Numb phosphorylation and integrin endocytosis during migration.","evidence":"Biochemical lipid-binding, structural characterization, cell polarization assays, and endocytosis/migration assays","pmids":["18082612","17609107","17606991"],"confidence":"High","gaps":["How lipid and protein binding are spatially combined at junctions not fully resolved"]},{"year":2008,"claim":"Mapped the antagonistic phosphorylation network controlling PAR-3, identifying Rho-kinase phosphorylation at Thr-833 that disrupts the complex and PP1α dephosphorylation that maintains it, plus the structural basis of PTEN recruitment.","evidence":"In vitro kinase assays, mutagenesis, quantitative mass spectrometry of phosphosites, phosphatase assays, and PDZ3-PTEN crystal structure","pmids":["18267089","18641122","18550519"],"confidence":"High","gaps":["Integration of multiple kinase/phosphatase inputs into a single localization decision not modeled"]},{"year":2009,"claim":"Demonstrated that the PAR-3–aPKC interaction is essential for apical domain development but dispensable for tight junction maturation, separating distinct scaffold functions.","evidence":"siRNA knockdown with separation-of-function mutant rescue in 2D/3D MDCK culture; exocyst/RalA association in neurons","pmids":["19401335","19383721"],"confidence":"High","gaps":["Mechanism of apical cargo delivery downstream of the complex unclear","Exocyst link rests on single-method co-IP"]},{"year":2010,"claim":"Consolidated the regulatory logic of PAR-3 localization through PP2A counter-balancing of PAR-1, Rho-kinase inhibition of lipid binding, Crumbs/Stardust competition, Siah-mediated degradation, and Sirt2 deacetylation controlling aPKC activity.","evidence":"Phospho-mutant and genetic epistasis in Drosophila, in vitro lipid-binding, ubiquitination assays, transgenic mouse deacetylation in Schwann cells, and live imaging in C. elegans","pmids":["20434988","20833361","20303268","21949390","21109632","20819933","19531360","20619750","20431121"],"confidence":"High","gaps":["Relative contributions of degradation versus phosphorylation to localization not quantified"]},{"year":2012,"claim":"Provided the structural basis for aPKC substrate recognition of PAR-3, defining the kinase groove and consensus sequence that governs phosphorylation-dependent complex regulation.","evidence":"X-ray crystallography of PKCι–PAR-3 peptide complex at 2.4 Å with mutagenesis and in vitro kinase assays","pmids":["22579248"],"confidence":"High","gaps":["Structure of full-length PAR-3 scaffold not determined"]},{"year":2015,"claim":"Connected PAR-3 to Hippo signaling, showing cytoplasmic PARD3 promotes PP1A–LATS1 association to inactivate LATS1 and activate TAZ, defining a junction-independent signaling role.","evidence":"Co-IP of the ternary complex, phosphorylation status measurement, and domain separation experiments; centrosome orientation and Girdin transcriptional roles","pmids":["26116754","25793442","25977476"],"confidence":"Medium","gaps":["Single-lab co-IP without reciprocal in vivo validation","How cytoplasmic versus junctional pools are partitioned unclear"]},{"year":2018,"claim":"Validated the PARD3–Hippo axis in vivo, showing PARD3 acts upstream of YAP/TAZ to control radial glial division mode and cortical development, and extended polarity control to flow-dependent endothelial planar polarity via GSK3β.","evidence":"In vivo conditional knockout with YAP/TAZ epistasis and live imaging in mouse cortex; co-IP and flow assays in endothelial cells","pmids":["29899142","30018153"],"confidence":"High","gaps":["Direct biochemical link between junctional PARD3 and YAP/TAZ regulation not fully reconstituted","Endothelial findings rest on single-lab functional assays"]},{"year":null,"claim":"How the multiple kinase, phosphatase, lipid, adhesion, and degradation inputs are integrated in real time to produce a single sharp polarity boundary, and how PAR-3 partitions between junctional and cytoplasmic signaling pools, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No quantitative model integrating competing inputs","Full-length PAR-3 structure unknown","Mechanism partitioning junctional polarity from cytoplasmic Hippo signaling undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,7,8,16]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[30,40,39]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[8,21,25,22]},{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[10,14,11]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,30,40,10]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[50,54]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[25,26]}],"pathway":[{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[10,11,14,13]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[50,53,54]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[20,24,5,53]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[0,5,6,51]}],"complexes":["PAR-3/PAR-6/aPKC polarity complex"],"partners":["PRKCI","PARD6","F11R","PVRL1","TIAM1","PTEN","LIMK2","KIF3A"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8TEW0","full_name":"Partitioning defective 3 homolog","aliases":["Atypical PKC isotype-specific-interacting protein","ASIP","CTCL tumor antigen se2-5","PAR3-alpha"],"length_aa":1356,"mass_kda":151.4,"function":"Adapter protein involved in asymmetrical cell division and cell polarization processes (PubMed:10954424, PubMed:27925688). Seems to play a central role in the formation of epithelial tight junctions (PubMed:27925688). Targets the phosphatase PTEN to cell junctions (By similarity). Involved in Schwann cell peripheral myelination (By similarity). Association with PARD6B may prevent the interaction of PARD3 with F11R/JAM1, thereby preventing tight junction assembly (By similarity). The PARD6-PARD3 complex links GTP-bound Rho small GTPases to atypical protein kinase C proteins (PubMed:10934474). Required for establishment of neuronal polarity and normal axon formation in cultured hippocampal neurons (PubMed:19812038, PubMed:27925688)","subcellular_location":"Cytoplasm; Endomembrane system; Cell junction; Cell junction, tight junction; Cell junction, adherens junction; Cell membrane; Cytoplasm, cell cortex; Cytoplasm, cytoskeleton","url":"https://www.uniprot.org/uniprotkb/Q8TEW0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PARD3","classification":"Not Classified","n_dependent_lines":97,"n_total_lines":1208,"dependency_fraction":0.0802980132450331},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/PARD3","total_profiled":1310},"omim":[{"mim_id":"619353","title":"PAR3 FAMILY CELL POLARITY REGULATOR, BETA; PARD3B","url":"https://www.omim.org/entry/619353"},{"mim_id":"616305","title":"FERM DOMAIN-CONTAINING PROTEIN 4A; FRMD4A","url":"https://www.omim.org/entry/616305"},{"mim_id":"611934","title":"EPILEPSY, IDIOPATHIC GENERALIZED, SUSCEPTIBILITY TO, 5; EIG5","url":"https://www.omim.org/entry/611934"},{"mim_id":"610668","title":"INSC SPINDLE ORIENTATION ADAPTOR PROTEIN; INSC","url":"https://www.omim.org/entry/610668"},{"mim_id":"608293","title":"RHO GTPase-ACTIVATING PROTEIN 17; ARHGAP17","url":"https://www.omim.org/entry/608293"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"},{"location":"Cell Junctions","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/PARD3"},"hgnc":{"alias_symbol":["PARD-3","PAR-3","PAR3","PARD3A","Bazooka","Baz","ASIP","PPP1R118"],"prev_symbol":[]},"alphafold":{"accession":"Q8TEW0","domains":[{"cath_id":"3.10.20.90","chopping":"3-84","consensus_level":"high","plddt":90.9851,"start":3,"end":84},{"cath_id":"2.30.42.10","chopping":"269-359","consensus_level":"high","plddt":90.2137,"start":269,"end":359},{"cath_id":"2.30.42.10","chopping":"459-477_487-548","consensus_level":"high","plddt":88.8701,"start":459,"end":548},{"cath_id":"2.30.42.10","chopping":"578-684","consensus_level":"high","plddt":82.5855,"start":578,"end":684}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8TEW0","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8TEW0-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8TEW0-F1-predicted_aligned_error_v6.png","plddt_mean":54.03},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PARD3","jax_strain_url":"https://www.jax.org/strain/search?query=PARD3"},"sequence":{"accession":"Q8TEW0","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8TEW0.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8TEW0/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8TEW0"}},"corpus_meta":[{"pmid":"10934475","id":"PMC_10934475","title":"A 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epithelial cell polarity by PAR-3 depends on Girdin transcription and Girdin-Gαi3 signaling.","date":"2015","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/25977476","citation_count":33,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":44992,"output_tokens":12481,"usd":0.161096,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":23807,"output_tokens":5775,"usd":0.131705,"stage2_stop_reason":"end_turn"},"total_usd":0.292801,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1995,\n      \"finding\": \"PAR-3 protein is asymmetrically distributed at the periphery of the zygote and asymmetrically dividing blastomeres in C. elegans. PAR-3 is required for proper localization of PAR-1, and par-2 activity is required for proper localization of PAR-3, establishing a mutual epistatic relationship between PAR-2, PAR-3, and PAR-1 in controlling embryonic polarity and cleavage spindle orientation.\",\n      \"method\": \"Immunolocalization, genetic epistasis analysis using par mutants\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct protein localization combined with genetic epistasis, foundational study replicated across multiple subsequent papers\",\n      \"pmids\": [\"8521491\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"par-3 and par-2 act in concert during the first cell cycle to affect asymmetric modification of the cytoskeleton; par-3 is epistatic to par-2 in controlling spindle orientation in C. elegans embryos.\",\n      \"method\": \"Genetic epistasis analysis, temperature-shift experiments with double mutants\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with double mutants, replicated across labs\",\n      \"pmids\": [\"7713417\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"par-6 acts upstream of par-3 by localizing or maintaining the PAR-3 protein at the cell periphery in C. elegans embryos; loss-of-function par-6 mutations act as dominant bypass suppressors of par-2 loss-of-function mutations.\",\n      \"method\": \"Genetic epistasis, immunolocalization of PAR-3 in par-6 mutant embryos\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with immunolocalization, independently replicated\",\n      \"pmids\": [\"8898226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"ASIP (mammalian PAR-3 homolog) directly binds to atypical PKC isoforms (PKCλ/PKCζ) via PDZ domains and colocalizes with PKCλ to the tight junction complex in epithelial cells, suggesting a conserved role for the PAR-3/aPKC complex in cell polarity.\",\n      \"method\": \"Co-immunoprecipitation, immunoelectron microscopy, sequence analysis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP with localization data, independently replicated in multiple subsequent papers\",\n      \"pmids\": [\"9763423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"In C. elegans, aPKC (PKC-3) directly interacts with PAR-3, co-localizes with PAR-3 to the anterior periphery of asymmetrically dividing cells, and shows mutual dependence on PAR-3 (and par-6) for correct localization. PKC-3 depletion by RNAi causes Par-like polarity phenotypes.\",\n      \"method\": \"In vitro binding assay, RNA interference, immunolocalization\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro binding plus RNAi phenocopy plus co-localization, replicated across organisms\",\n      \"pmids\": [\"9716526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Drosophila Bazooka (PAR-3 ortholog) is required for establishment of apico-basal polarity in epithelia and neuroblasts; Baz protein is restricted to the apical cortical cytoplasm of epithelial cells and neuroblasts, and bazooka mutants show defective spindle orientation.\",\n      \"method\": \"Loss-of-function genetics, immunolocalization\",\n      \"journal\": \"Current biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function with defined polarity phenotype, replicated\",\n      \"pmids\": [\"9889099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Bazooka/PAR-3 directly binds Inscuteable in vitro and in vivo, forming a complex that also contains Staufen; Bazooka is required for asymmetric apical localization of Inscuteable in Drosophila neuroblasts, which in turn controls spindle orientation and Numb/Miranda asymmetric localization.\",\n      \"method\": \"In vitro binding assay, in vivo co-immunoprecipitation, genetic loss-of-function (maternal/zygotic null)\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted direct binding plus genetic epistasis plus phenotypic readout, independently replicated\",\n      \"pmids\": [\"10591216\", \"10591217\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"PAR-6 is a PDZ-domain protein that colocalizes with PAR-3 in C. elegans embryos; PAR-3 and PKC-3 activity are required for peripheral localization of PAR-6, supporting a trimeric PAR-3/PAR-6/PKC-3 complex.\",\n      \"method\": \"Molecular cloning, immunolocalization, genetic analysis\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — immunolocalization with genetic dependency analysis, replicated\",\n      \"pmids\": [\"9834192\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Mammalian mPAR-3 and mPAR-6 associate through their PDZ domains. mPAR-6 binds Cdc42/Rac1 GTPases. Both mPAR-3 and mPAR-6 bind independently to atypical PKC isoforms. In vitro, mPAR-3 acts as both a substrate and an inhibitor of aPKC, suggesting a scaffolding function coordinating signaling proteins for cell polarity.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, PDZ domain binding assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro enzymatic assay + co-IP + domain mapping, independently replicated\",\n      \"pmids\": [\"10934475\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Drosophila aPKC (DaPKC) directly binds to Bazooka/PAR-3, and both proteins are mutually dependent for correct apical localization. Loss-of-function of DaPKC causes loss of apico-basal polarity, multilayering of epithelia, mislocalization of Inscuteable, and abnormal spindle orientation in neuroblasts.\",\n      \"method\": \"Direct binding assay, genetic loss-of-function, immunolocalization\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct binding + genetic loss-of-function with multiple orthogonal phenotypic readouts\",\n      \"pmids\": [\"10995441\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"ASIP/PAR-3 directly associates with junctional adhesion molecule (JAM) in vitro and in vivo through its PDZ domains. Overexpression of truncated JAM lacking the extracellular domain disrupts ASIP/PAR-3 localization at intercellular junctions, suggesting JAM tethers the PAR-3/aPKC complex to tight junctions.\",\n      \"method\": \"In vitro binding assay, co-immunoprecipitation, overexpression studies in fibroblasts and CHO cells\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro binding confirmed by reciprocal co-IP with functional localization consequence, independently replicated\",\n      \"pmids\": [\"11447115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"ZO-1 directly binds JAM at its PDZ3 domain, while PAR-3 directly binds the C-terminus of JAM (but not claudins). A model is proposed where JAM aggregates tethered to claudin-based strands through ZO-1 recruit PAR-3 to tight junctions.\",\n      \"method\": \"In vitro binding assays, immunofluorescence, immunoreplica electron microscopy\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in vitro binding with specificity controls, replicated by Ebnet et al.\",\n      \"pmids\": [\"11489913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"aPKC preferentially phosphorylates PAR-3 at serine-827 in vitro and in vivo; this phosphorylation reduces the stability of the PAR-3–aPKC interaction. Overexpression of PAR-3 S827A (non-phosphorylatable) causes defects in cell-cell contact-induced cell polarization of MDCK cells, similar to dominant-negative aPKC.\",\n      \"method\": \"In vitro kinase assay, phospho-specific antibody, MDCK overexpression studies\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro phosphorylation + site-specific mutagenesis + in vivo phospho-antibody validation + functional consequence\",\n      \"pmids\": [\"12390250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Overexpression of ASIP/PAR-3, but not a deletion mutant lacking the aPKC-binding sequence, promotes cell-cell contact-induced tight junction formation in MDCK cells. PAR-3 Ser827 is phosphorylated at the most apical tip of cell-cell contacts during initial tight junction formation, implicating PAR-3/aPKC interaction in this process.\",\n      \"method\": \"Inducible overexpression, transepithelial resistance measurement, occludin insolubilization assay, immunofluorescence\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — domain deletion analysis with functional readout, replicated in multiple papers\",\n      \"pmids\": [\"12045219\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"PAR-3 directly binds nectin-1 and nectin-3 (but not nectin-2) through its first PDZ domain at neuroepithelial adherens junctions; PAR-3 and nectin-1/-3 co-immunoprecipitate from embryonic mouse brain and recombinant proteins bind stoichiometrically.\",\n      \"method\": \"Co-immunoprecipitation from mouse brain, recombinant protein binding assay, PDZ domain mapping\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — stoichiometric binding reconstituted in vitro + co-IP in vivo with domain mapping\",\n      \"pmids\": [\"12515806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"PAR-1 phosphorylates Bazooka/PAR-3 on two conserved serines (generating 14-3-3 binding sites), which inhibits Bazooka oligomerization and binding to aPKC. This excludes Bazooka from lateral membranes in epithelia; a Bazooka lacking PAR-1 phosphorylation/14-3-3 binding sites forms ectopic lateral complexes, disrupting polarity.\",\n      \"method\": \"In vitro kinase assay, genetic epistasis, site-directed mutagenesis, immunolocalization\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay + mutagenesis + genetic epistasis with multiple polarity phenotypes\",\n      \"pmids\": [\"14675534\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The conserved N-terminal domain CR1 of PAR-3 mediates self-association/oligomerization in vitro and in vivo. CR1 deletion disrupts localization of aPKC and PAR-6 as well as PAR-3 and delays formation of functional tight junctions. Sequence 937-1024 is also required for recruitment to the apical side of cell-cell contact.\",\n      \"method\": \"In vitro and in vivo oligomerization assays, MDCK overexpression, transepithelial resistance\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro biochemical assay + domain mutagenesis + functional consequences in epithelial cells\",\n      \"pmids\": [\"12756256\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Bazooka CR1 domain mediates oligomerization in vitro and in vivo (predicted by structural fold comparison to a bacterial oligomerization domain); deletion of CR1 disrupts BAZ localization in epithelial cells and germline and strongly impairs BAZ function in epithelial polarity.\",\n      \"method\": \"Sequence-structure comparison (FUGUE), biochemical oligomerization assay, Drosophila genetics\",\n      \"journal\": \"Current biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — biochemical assay + genetic loss-of-function with polarity phenotype\",\n      \"pmids\": [\"12906794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"JAM-2 and JAM-3 directly associate with PAR-3 through its first PDZ domain; junctional localization of JAM-2 is regulated by serine phosphorylation, and JAM-2 clustering at cell-cell contacts recruits endogenous PAR-3 and ZO-1.\",\n      \"method\": \"In vitro binding assay, co-immunoprecipitation, ectopic expression in CHO cells\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct binding assay with domain mapping + functional recruitment experiment\",\n      \"pmids\": [\"12953056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Genetic epistasis in Drosophila shows bazooka functions redundantly with crumbs/stardust to support apical polarity at mid-to-late embryogenesis; crb and lgl pathways function competitively to define apical and basolateral surfaces.\",\n      \"method\": \"Drosophila genetic epistasis, double and triple mutant analysis\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — rigorous genetic epistasis in multiple mutant combinations, replicated\",\n      \"pmids\": [\"12510193\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"PAR-3 directly interacts with KIF3A (a plus-end-directed microtubule motor), and aPKC can associate with KIF3A through PAR-3. Expression of dominant-negative PAR-3 and KIF3A fragments that disrupt PAR-3–KIF3A binding inhibited accumulation of PAR-3 and aPKC at the neurite tip and abolished neuronal polarity in cultured hippocampal neurons.\",\n      \"method\": \"Co-immunoprecipitation, dominant-negative fragment expression, immunofluorescence in hippocampal neurons\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP + dominant-negative functional perturbation with defined neuronal polarity readout\",\n      \"pmids\": [\"15048131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Par-3 depletion in mammalian epithelial cells profoundly disrupts tight junction assembly; Rac is constitutively activated in cells lacking Par-3. Par-3 directly binds the Rac-GEF Tiam1 through its C-terminal region; knockdown of Tiam1 enhances tight junction formation in Par-3-depleted cells, revealing Par-3 as a spatial regulator of Rac activity via Tiam1.\",\n      \"method\": \"siRNA knockdown, dominant-negative Rac rescue, direct binding assay, tight junction formation assay\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct binding + siRNA knockdown + rescue experiments + Rac activity measurement with multiple orthogonal methods\",\n      \"pmids\": [\"15723052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"PAR-3 directly interacts with STEF/Tiam1 (Rac-specific GEFs) and forms a complex with PAR-3–aPKC–PAR-6–Cdc42-GTP. Disruption of PAR-3–STEF binding inhibits Cdc42-induced lamellipodia. PAR-3 is required for Cdc42-induced Rac activation. In hippocampal neurons, STEF accumulates at the axon tip colocalizing with PAR-3, suggesting a Cdc42–PAR-6–PAR-3–STEF/Tiam1–Rac signaling cascade in neuronal polarity.\",\n      \"method\": \"Co-immunoprecipitation, dominant-negative fragment expression, Rac GTPase activity assay, immunofluorescence\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct binding + complex reconstitution + Rac activity assay + functional neuronal readout, independent replication of PAR-3/Tiam1 interaction\",\n      \"pmids\": [\"15723051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Drosophila Bazooka directly binds the lipid phosphatase PTEN in vitro and in vivo; PTEN colocalizes with Baz in the apical cortex of epithelia and neuroblasts. Pten mutant phenotypes include defects in posterior germ plasm determinant localization and actin-dependent nuclear movements.\",\n      \"method\": \"In vitro binding assay, co-immunoprecipitation, genetic loss-of-function\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro binding + in vivo co-IP + colocalization + genetic phenotype\",\n      \"pmids\": [\"15743877\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Par-3 directly binds p75 neurotrophin receptor (p75NTR) and recruits it to the axon-glial junction in Schwann cells; disruption of Par-3 localization by overexpression or knockdown inhibits myelination, defining a Par-3/p75NTR complex necessary for Schwann cell myelination.\",\n      \"method\": \"Direct binding assay, co-immunoprecipitation, overexpression and knockdown in Schwann cells, myelination assay\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct binding + co-IP + loss- and gain-of-function with defined myelination readout\",\n      \"pmids\": [\"17082460\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Par-3 depletion elevates phosphorylated cofilin levels; Par-3 directly binds LIMK2 (but not LIMK1) and inhibits LIMK2 kinase activity in vitro. A non-phosphorylatable cofilin mutant partially rescues tight junction assembly in Par-3-depleted cells. This identifies LIMK2 as a novel Par-3 target linking actin dynamics to tight junction assembly.\",\n      \"method\": \"siRNA knockdown, direct binding assay, in vitro kinase assay, rescue experiments\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase inhibition + direct binding with specificity + siRNA rescue experiment\",\n      \"pmids\": [\"16505165\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"PAR-3 is necessary for normal dendritic spine development; depletion causes multiple filopodia/lamellipodia-like protrusions (similar to activated Rac). PAR-3 spatially restricts TIAM1 to dendritic spines by direct binding, thereby modulating Rac-GTP levels during spine morphogenesis.\",\n      \"method\": \"siRNA knockdown, direct binding assay, live imaging, Rac activity assay in hippocampal neurons\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding + siRNA with defined spine morphogenesis readout + Rac activity measurement\",\n      \"pmids\": [\"16474385\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"MARK2/PAR-1 functions downstream of the PAR-3/PAR-6/aPKC complex in hippocampal neuron polarity; aPKC phosphorylates MARK2 at T595, and an MARK2 mutant not responsive to aPKC is not rescued by the PAR-3/PAR-6/aPKC complex. Genetic epistasis places MARK2 downstream of aPKC in neuronal polarization.\",\n      \"method\": \"siRNA knockdown, ectopic expression, epistasis analysis, phosphorylation assays in hippocampal neurons\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis + phosphorylation site mutagenesis + multiple neuronal polarity readouts\",\n      \"pmids\": [\"16717194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PAR-3 directly interacts with KIF3A-containing KIF3 complex; the PAR-3/KIF3 association mediates transport of PAR-3 to the distal tip of the axon. Disruption of this interaction impairs axon formation and neuronal polarity in hippocampal neurons.\",\n      \"method\": \"Co-immunoprecipitation, dominant-negative expression, immunofluorescence\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP + dominant-negative perturbation + defined neuronal polarity readout\",\n      \"pmids\": [\"15048131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Numb binds to PAR-3 and is phosphorylated by aPKC, causing release from clathrin-coated structures; PAR-3/aPKC-mediated polarized phosphorylation of Numb contributes to directional integrin endocytosis and cell migration toward integrin substrates.\",\n      \"method\": \"RNAi, co-immunoprecipitation, integrin endocytosis assay, cell migration assay\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding + phosphorylation + functional migration and endocytosis readouts\",\n      \"pmids\": [\"17609107\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The second PDZ domain of Par-3 binds phosphatidylinositol lipid membranes with high affinity; Par-3 PDZ2 membrane binding capacity is critical for epithelial cell polarization. The third PDZ domain of Par-3 directly binds PTEN. Concatenation of PIP-binding PDZ2 and PTEN-binding PDZ3 enables Par-3 to integrate phosphoinositide signaling.\",\n      \"method\": \"Biochemical lipid-binding assays, structural characterization, cell polarization assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — biochemical and structural characterization with functional validation in epithelial cells\",\n      \"pmids\": [\"18082612\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Par-3 cooperates with afadin in forming adherens and tight junctions; Par-3 promotes the association of afadin with nectin, while afadin is not required for Par-3–nectin association. Par-3 and afadin cooperatively regulate AJ and TJ formation downstream of nectin-based cell-cell adhesion.\",\n      \"method\": \"Par-3 knockdown in MDCK cells, co-immunoprecipitation, immunofluorescence\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown + co-IP, single lab\",\n      \"pmids\": [\"17606991\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Rho-kinase/ROCK phosphorylates PAR-3 at Thr833, disrupting its interaction with aPKC and PAR-6 but not with Tiam2/STEF. Phospho-PAR-3 is observed in the leading edge of migrating cells; PAR-3 knockdown impairs cell migration and PAR-3-mediated Rac1 activation, which are recovered with siRNA-resistant PAR-3 but not with a phospho-mimic mutant.\",\n      \"method\": \"In vitro kinase assay, site-directed mutagenesis, siRNA knockdown, rescue experiments, Rac1 activity assay\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay + mutagenesis + siRNA rescue + Rac activity assay with defined site specificity\",\n      \"pmids\": [\"18267089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Protein phosphatase PP1 (predominantly PPα isoform) binds Par-3 and retains phosphatase activity; PP1α specifically dephosphorylates Par-3 at Ser-144, Ser-824, and Ser-885 (identified by quantitative mass spectrometry/MRM). PP1α regulates 14-3-3 and aPKCζ binding to Par-3. Catalytically inactive PP1α severely delays tight junction formation in MDCK cells.\",\n      \"method\": \"Co-immunoprecipitation, quantitative mass spectrometry (MRM), phosphatase activity assay, tight junction formation assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — quantitative mass spectrometry identification of phosphosites + phosphatase activity assay + functional consequence\",\n      \"pmids\": [\"18641122\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Crystal structures of Par-3 PDZ3 in free and PTEN-peptide-bound forms reveal that Par-3 PDZ3 binds PTEN via two discrete sites: a canonical PDZ-ligand site and a distal charge-charge interaction site. Par-3 PDZ3-PTEN binding is required for enrichment of PTEN at junctional membranes of MDCK cells, and junctional PTEN is specifically required for cell polarization.\",\n      \"method\": \"X-ray crystallography, mutagenesis, MDCK cell polarization assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure + mutagenesis + functional validation in cells\",\n      \"pmids\": [\"18550519\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PAR-3 knockdown in MDCK cells retards apical protein delivery; PAR-3 S827/829A mutant (unable to interact with aPKC) fails to rescue PAR-3 knockdown defects in apical membrane development, demonstrating that formation of the PAR-3–aPKC–PAR-6 complex is essential for apical domain development. Tight junction maturation does not require the aPKC–PAR-3 interaction.\",\n      \"method\": \"siRNA knockdown, point mutant rescue, 2D and 3D MDCK culture, immunofluorescence\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — siRNA + separation-of-function mutagenesis in multiple culture systems\",\n      \"pmids\": [\"19401335\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PP2A binds Baz/PAR-3 via its structural A subunit and dephosphorylates Baz at the conserved serine 1085 (PAR-1 phosphorylation site), antagonizing PAR-1 kinase activity. Loss of PP2A function in Drosophila neuroblasts causes complete reversal of polarity; overexpression of PAR-1 or Baz or 14-3-3 mutation causes the same phenotype, placing PP2A activity in the PAR-1/Baz phosphorylation balance determining NB polarity.\",\n      \"method\": \"Co-immunoprecipitation, phospho-specific antibodies, genetic epistasis in Drosophila\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP with phospho-specific readout + genetic epistasis with multiple allele combinations\",\n      \"pmids\": [\"19531360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RalA-regulated association between the exocyst complex and PAR-3 increases during early stages of neuronal polarization. Depletion of Sec6, Sec8, or Exo84 exocyst subunits leads to unpolarized neurons, and constitutively active RalA unable to bind the exocyst has no effect on neuronal polarization.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, overexpression in cultured neurons\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — co-IP interaction identified, single lab, single method for the PAR-3/exocyst interaction\",\n      \"pmids\": [\"19383721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"aPKC phosphorylation of Bazooka disrupts the Baz/aPKC interaction and excludes Baz from the apical domain in Drosophila epithelia. Additionally, the Crumbs complex prevents Baz/PAR-6 interaction in epithelia. Without Crumbs or aPKC phosphorylation, mislocalized Baz recruits adherens junction components apically, expanding the lateral domain at the expense of the apical domain.\",\n      \"method\": \"Phospho-mutant analysis, genetic epistasis, immunolocalization in Drosophila epithelia\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — phospho-mutant + genetic epistasis with multiple readouts, rigorously characterized\",\n      \"pmids\": [\"20434988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Rho-kinase is required for planar polarized distribution of Bazooka/PAR-3 in Drosophila embryo intercalating cells; activated Rho-kinase is sufficient to exclude Baz from the cortex. Rho-kinase can phosphorylate the Baz C-terminal domain and inhibit its interaction with phosphoinositide membrane lipids, providing a mechanism for regulating Baz cortical association.\",\n      \"method\": \"Genetic loss-of-function, constitutively active expression, in vitro phosphorylation, lipid-binding assays\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay + lipid-binding inhibition + genetic loss- and gain-of-function\",\n      \"pmids\": [\"20833361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The conserved C-terminal region of Bazooka/PAR-3 (not PDZ domains) binds phosphoinositide lipids directly and mediates cortical localization of Baz by direct plasma membrane interaction in multiple Drosophila cell types. PDZ domains are dispensable for correct Baz localization.\",\n      \"method\": \"Structure-function analysis, lipid-binding assay, Drosophila genetics in multiple cell types\",\n      \"journal\": \"Current biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct lipid-binding assay + domain deletion analysis in four cell types\",\n      \"pmids\": [\"20303268\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ASPP2 directly binds Par-3, and the junctional localization of ASPP2 and Par-3 is interdependent. ASPP2 controls apical/junctional Par-3 localization without affecting Par-3 expression or Par-3/aPKCλ binding; disruption leads to neuroblastic rosette formation and impaired neural progenitor proliferation in vivo.\",\n      \"method\": \"Co-immunoprecipitation, in vivo mouse CNS analysis, immunofluorescence\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP + in vivo phenotype with localization analysis, single lab\",\n      \"pmids\": [\"20619750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Sirt2 deacetylates Par-3 in Schwann cells; deacetylation of Par-3 by Sirt2 decreases the activity of aPKC, thereby regulating myelin formation. Transgenic mice lacking or overexpressing Sirt2 specifically in Schwann cells show delays in myelin formation.\",\n      \"method\": \"In vivo genetic mouse model, deacetylation assay, aPKC activity assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct biochemical deacetylation assay + in vivo transgenic mouse with defined myelination readout\",\n      \"pmids\": [\"21949390\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Siah E3 ubiquitin ligase promotes proteasomal degradation of Pard3A in cerebellar granule neurons. Pard3A gain of function and Siah loss of function induce precocious radial migration. Pard3A promotes adhesive interactions for germinal zone exit by recruiting epithelial tight junction adhesion molecule C to the neuronal cell surface.\",\n      \"method\": \"In vivo gain-of-function and loss-of-function, ubiquitin ligase assay, time-lapse imaging, cell surface recruitment assay\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic manipulation + biochemical ubiquitination + live imaging with adhesion readout\",\n      \"pmids\": [\"21109632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PAR-3 mediates the initial clustering of E-cadherin and other adherens junction/polarity proteins into cortical foci that then travel and accumulate apically during C. elegans intestinal epithelial cell polarization. PAR-3 is required to assemble E-cadherin into foci and for foci to accumulate at the apical surface.\",\n      \"method\": \"Targeted protein degradation strategy in C. elegans, live imaging\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — targeted protein degradation with live imaging showing dynamic clustering and transport\",\n      \"pmids\": [\"20431121\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Baz directly interacts with Stardust (Sdt) via Sdt's PDZ domain and the aPKC phosphorylation site region of Baz; aPKC phosphorylation of Baz causes dissociation of the Baz-Sdt complex. Non-phosphorylatable Baz overexpression blocks Sdt dissociation and causes crb/sdt-like polarity phenotypes.\",\n      \"method\": \"In vitro binding assay, phospho-mutant analysis, Drosophila genetics\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro binding + phospho-mutant analysis + genetic phenotype\",\n      \"pmids\": [\"20819933\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Crystal structure of PKCι in complex with a Par-3 substrate peptide at 2.4 Å reveals that the Par-3 peptide binds an elongated groove formed by N- and C-lobes of the kinase domain. Structural analysis together with mutagenesis identifies a hydrophobic pocket unique to aPKC isozymes and a consensus aPKC substrate recognition sequence. The pseudosubstrate sequence of PKCι directly binds and inhibits kinase activity similarly to the Par-3 peptide.\",\n      \"method\": \"X-ray crystallography, mutagenesis, in vitro kinase assay\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure at 2.4 Å + mutagenesis + biochemical validation\",\n      \"pmids\": [\"22579248\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Dynamic microtubules positioned along the dorso-ventral axis inhibit RhoGEF2, reducing Rho-kinase membrane recruitment and increasing a mobile E-cadherin pool complexed with Bazooka/PAR-3 (measured by FRAP). This mobile E-cadherin-Bazooka complex prevents multicellular rosette formation and cell motility across segment borders.\",\n      \"method\": \"FRAP, genetic analysis, immunofluorescence in Drosophila embryos\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FRAP + co-complex identification + genetic perturbation, single lab\",\n      \"pmids\": [\"23751496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Loss of Par3/Bazooka from cell-cell junctions at epithelial edges during Drosophila wound healing results in localized PIP3 accumulation, which promotes actin protrusion formation; depleting PIP3 causes defective epithelial closure. This establishes a direct molecular link between Par3 loss, PI3K signaling, and actin protrusion.\",\n      \"method\": \"Drosophila genetics, wound healing assay, dorsal closure assay, PIP3 biosensor imaging\",\n      \"journal\": \"Development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic perturbation + lipid biosensor imaging + functional closure readout, single lab\",\n      \"pmids\": [\"23318638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PI(4,5)P2, produced by the PI4P5K SKTL, is required to maintain apical PAR-3/Bazooka localization at the plasma membrane; reduction of PI(4,5)P2 causes loss of apical Baz, disassembly of adherens junctions, actin reorganization, and apical constriction similar to EMT. Loss of polarized PAR-3 distribution is sufficient to induce these cell shape changes.\",\n      \"method\": \"PI4P5K genetic inactivation, PI(4,5)P2 reporters, immunofluorescence, Drosophila follicular epithelium\",\n      \"journal\": \"Current biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic approach + lipid reporter + defined PAR-3 localization consequence, single lab\",\n      \"pmids\": [\"24768049\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PARD3 promotes interaction between PP1A and LATS1, inducing LATS1 dephosphorylation and inactivation, leading to dephosphorylation and activation of TAZ. Cytoplasmic (but not tight junction complex-associated) PARD3 is responsible for TAZ regulation, providing a mechanism by which PARD3 modulates Hippo pathway signaling.\",\n      \"method\": \"Co-immunoprecipitation, phosphorylation assays, domain separation experiments\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP of ternary complex + phosphorylation status measurement, single lab\",\n      \"pmids\": [\"26116754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Bazooka provides a cortical platform for correct centrosome orientation in Drosophila male germline stem cells; Baz-centrosome association is the key event monitored by the centrosome orientation checkpoint (COC) to ensure productive asymmetric cell division.\",\n      \"method\": \"Drosophila genetics, live imaging, centrosome orientation assay\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic analysis + live imaging, single lab\",\n      \"pmids\": [\"25793442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PAR-3 regulates the protein expression of Girdin (a GEF for Gαi subunits) at the transcriptional level by cooperating with the AP-2 transcription factor. PAR-3 physically interacts with Girdin; Girdin together with Gαi3 controls tight junction formation, apical domain development, and actin organization downstream of PAR-3.\",\n      \"method\": \"siRNA knockdown, co-immunoprecipitation, transcriptional reporter assay, MDCK cell polarity assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP + transcriptional reporter + siRNA with polarity readout, single lab\",\n      \"pmids\": [\"25977476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PARD3-deficient radial glial progenitors (RGPs) exhibit stage-dependent abnormal switches in division mode; simultaneous removal of YAP and TAZ suppresses cortical enlargement and heterotopia formation in PARD3-null cortex. This places PARD3 upstream of HIPPO pathway effectors in controlling RGP division mode and cortical development.\",\n      \"method\": \"In vivo conditional knockout in mouse cortex, epistasis with YAP/TAZ double knockout, live imaging\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo conditional KO + genetic epistasis with YAP/TAZ double KO + live imaging\",\n      \"pmids\": [\"29899142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PAR-3 acts as an essential gatekeeper of GSK3β activity in response to laminar blood flow in endothelial cells; flow-induced spatial distribution of PAR-3/aPKCλ and aPKCλ/GSK3β complexes controls local GSK3β activity and regulates endothelial planar polarity. PAR-3/aPKCλ spatial information is required for flow-dependent polarity but not for flow-induced anti-inflammatory response.\",\n      \"method\": \"Co-immunoprecipitation, kinase activity assays, endothelial cell flow experiments, siRNA knockdown\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP of ternary complexes + kinase activity + flow-based functional assay, single lab\",\n      \"pmids\": [\"30018153\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PARD3 (PAR-3/Bazooka) is a conserved PDZ-domain scaffold protein that assembles the core PAR-3/PAR-6/aPKC polarity complex; it localizes to apical junctional membranes via direct phosphoinositide (PI(4,5)P2) lipid binding and oligomerization through its CR1 domain, recruits aPKC (which phosphorylates PAR-3 at Ser-827/833 to dynamically regulate complex stability and localization), interfaces with junctional transmembrane proteins JAM and nectin to anchor the complex at tight junctions, spatially restricts the Rac-GEF Tiam1/STEF to control Rac activity and actin dynamics, directly binds PTEN to integrate phosphoinositide signaling, is phosphorylated by PAR-1/MARK at conserved serines to generate 14-3-3 binding sites that exclude it from lateral membranes (antagonized by PP2A and PP1), is phosphorylated by Rho-kinase to disrupt PAR complex formation, is dephosphorylated by PP1α at multiple sites to maintain complex integrity, and is targeted for proteasomal degradation by the Siah E3 ligase and transcriptional downregulation by miR-491-5p; collectively these mechanisms position PAR-3 as a master organizer of apicobasal and planar cell polarity, tight junction assembly, asymmetric cell division, neuronal axon specification, and Schwann cell myelination, and modulate Hippo/LATS1/TAZ signaling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PARD3 (PAR-3/ASIP/Bazooka) is an evolutionarily conserved multi-PDZ scaffold protein that serves as the master organizer of cell polarity, partitioning membrane domains during asymmetric cell division, epithelial apicobasal polarization, and neuronal axon specification [#0, #5]. It nucleates the core polarity machinery by directly binding atypical PKC (PKCλ/ζ) and PAR-6 through its PDZ domains, assembling the trimeric PAR-3/PAR-6/aPKC complex that depends mutually on each subunit for cortical localization [#3, #7, #8]. PAR-3 is targeted to apical junctional membranes by two cooperating mechanisms: oligomerization through its conserved N-terminal CR1 domain [#16, #17], and direct phosphoinositide lipid binding by its PDZ2 domain and conserved C-terminal region [#30, #40]. There it is tethered to tight and adherens junctions through direct association with the transmembrane adhesion proteins JAM and nectin via its first PDZ domain [#10, #11, #14]. PAR-3 spatially restricts the Rac-GEFs Tiam1/STEF through direct binding, thereby controlling Rac activity and actin dynamics during tight junction assembly, dendritic spine morphogenesis, and cell migration [#21, #22, #26], and it concatenates phosphoinositide signaling by binding the lipid phosphatase PTEN through its third PDZ domain [#30, #34]. The complex is dynamically regulated by an antagonistic phosphorylation network: aPKC phosphorylates PAR-3 at Ser-827/833 to destabilize the interaction and tune localization [#12, #35], PAR-1/MARK phosphorylates conserved serines to generate 14-3-3 sites that exclude PAR-3 from lateral membranes [#15], Rho-kinase phosphorylates Thr-833 to disrupt aPKC/PAR-6 binding and inhibit lipid association during migration and planar polarity [#32, #39], and these are counterbalanced by PP1α and PP2A dephosphorylation [#33, #36]. PAR-3 abundance is further controlled by Siah E3 ligase-mediated proteasomal degradation [#43]. Through cytoplasmic promotion of PP1A–LATS1 interaction it inactivates LATS1 and activates TAZ, linking PAR-3 to Hippo/YAP-TAZ signaling and the control of neural progenitor division mode in vivo [#50, #53]. PAR-3 also directs neuronal polarity through KIF3 motor-mediated transport to the axon tip [#20, #28] and Schwann cell myelination via a Par-3/p75NTR complex [#24].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established PAR-3 as an asymmetrically localized determinant of embryonic polarity, defining the founding member of the PAR polarity system and its epistatic relationships with other par genes.\",\n      \"evidence\": \"Immunolocalization and genetic epistasis with par mutants in C. elegans zygotes\",\n      \"pmids\": [\"8521491\", \"7713417\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No molecular function or binding partners identified\", \"Mechanism of asymmetric localization unknown\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Identified the conserved PAR-3/aPKC interaction across species, revealing PAR-3 as a PDZ scaffold that physically couples a kinase to the polarity machinery and tethers it to tight junctions.\",\n      \"evidence\": \"Co-IP and immunoelectron microscopy in mammalian epithelia; in vitro binding and RNAi in C. elegans; loss-of-function genetics in Drosophila\",\n      \"pmids\": [\"9763423\", \"9716526\", \"9889099\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of the complex not resolved\", \"Functional consequence of phosphorylation not defined\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Defined the trimeric PAR-3/PAR-6/aPKC complex and linked it to spindle orientation determinants, showing PAR-3 organizes downstream fate factors during asymmetric division.\",\n      \"evidence\": \"In vitro binding, co-IP, and genetic null analysis in C. elegans and Drosophila neuroblasts (Inscuteable/Staufen)\",\n      \"pmids\": [\"10591216\", \"10591217\", \"9834192\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How PAR-3 selects apical versus basal targets unknown\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Showed PAR-3 acts as both substrate and inhibitor of aPKC and that PAR-6 bridges Cdc42/Rac1 to the complex, establishing PAR-3 as a signaling scaffold rather than a passive adaptor.\",\n      \"evidence\": \"Co-IP, PDZ domain mapping, and in vitro kinase assays of mammalian mPAR-3/mPAR-6\",\n      \"pmids\": [\"10934475\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"aPKC phosphorylation sites on PAR-3 not yet mapped\", \"Mechanism of GTPase regulation unresolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Determined how the complex is anchored at junctions, showing PAR-3 directly binds JAM C-termini while ZO-1 links JAM to claudin strands, providing a structural route for tight junction recruitment.\",\n      \"evidence\": \"In vitro binding, reciprocal co-IP, and overexpression with localization readout in fibroblasts/CHO cells\",\n      \"pmids\": [\"11447115\", \"11489913\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether JAM binding is sufficient for in vivo recruitment unclear\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified Ser-827 as the aPKC phosphorylation site whose modification destabilizes the PAR-3–aPKC interaction, introducing dynamic regulation of complex assembly during junction formation.\",\n      \"evidence\": \"In vitro kinase assay, phospho-specific antibody, and S827A mutant rescue in MDCK cells\",\n      \"pmids\": [\"12390250\", \"12045219\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Counteracting phosphatase not identified\", \"Other phosphosites unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Resolved PAR-3 cortical targeting via CR1-mediated oligomerization and identified PAR-1 phosphorylation generating 14-3-3 sites that exclude PAR-3 from lateral membranes, establishing the kinase-driven spatial code for membrane domain restriction.\",\n      \"evidence\": \"Oligomerization assays, domain deletion in MDCK, in vitro kinase assay and genetic epistasis in Drosophila; nectin/JAM binding by PDZ1\",\n      \"pmids\": [\"12756256\", \"12906794\", \"14675534\", \"12515806\", \"12953056\", \"12510193\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How oligomerization and phosphorylation are coordinated temporally unclear\", \"Lipid-binding contribution not yet defined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Linked PAR-3 to directional transport by showing KIF3A motor binding delivers PAR-3/aPKC to the neurite tip, extending the polarity scaffold to neuronal axon specification.\",\n      \"evidence\": \"Co-IP and dominant-negative fragment expression in hippocampal neurons\",\n      \"pmids\": [\"15048131\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cargo selectivity of transport not defined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Established PAR-3 as a spatial regulator of Rac through direct binding and restriction of the Rac-GEFs Tiam1/STEF, connecting the polarity complex to actin dynamics and tight junction assembly.\",\n      \"evidence\": \"Direct binding, siRNA knockdown, dominant-negative Rac rescue, and Rac activity assays in epithelia and neurons; PTEN binding and genetics in Drosophila\",\n      \"pmids\": [\"15723052\", \"15723051\", \"15743877\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PAR-3 activates or sequesters Tiam1 context-dependent and unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Expanded PAR-3 targets to LIMK2/cofilin actin regulation, p75NTR-dependent Schwann cell myelination, and dendritic spine morphogenesis, demonstrating tissue-specific deployment of the scaffold.\",\n      \"evidence\": \"In vitro kinase inhibition, direct binding, siRNA rescue in epithelia and neurons, and myelination assays in Schwann cells\",\n      \"pmids\": [\"16505165\", \"17082460\", \"16474385\", \"16717194\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How PAR-3 selects different effectors across tissues not established\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined the lipid-integration function of PAR-3, showing PDZ2 binds phosphoinositides while PDZ3 binds PTEN, and linked PAR-3/aPKC to Numb phosphorylation and integrin endocytosis during migration.\",\n      \"evidence\": \"Biochemical lipid-binding, structural characterization, cell polarization assays, and endocytosis/migration assays\",\n      \"pmids\": [\"18082612\", \"17609107\", \"17606991\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How lipid and protein binding are spatially combined at junctions not fully resolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Mapped the antagonistic phosphorylation network controlling PAR-3, identifying Rho-kinase phosphorylation at Thr-833 that disrupts the complex and PP1α dephosphorylation that maintains it, plus the structural basis of PTEN recruitment.\",\n      \"evidence\": \"In vitro kinase assays, mutagenesis, quantitative mass spectrometry of phosphosites, phosphatase assays, and PDZ3-PTEN crystal structure\",\n      \"pmids\": [\"18267089\", \"18641122\", \"18550519\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Integration of multiple kinase/phosphatase inputs into a single localization decision not modeled\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrated that the PAR-3–aPKC interaction is essential for apical domain development but dispensable for tight junction maturation, separating distinct scaffold functions.\",\n      \"evidence\": \"siRNA knockdown with separation-of-function mutant rescue in 2D/3D MDCK culture; exocyst/RalA association in neurons\",\n      \"pmids\": [\"19401335\", \"19383721\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of apical cargo delivery downstream of the complex unclear\", \"Exocyst link rests on single-method co-IP\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Consolidated the regulatory logic of PAR-3 localization through PP2A counter-balancing of PAR-1, Rho-kinase inhibition of lipid binding, Crumbs/Stardust competition, Siah-mediated degradation, and Sirt2 deacetylation controlling aPKC activity.\",\n      \"evidence\": \"Phospho-mutant and genetic epistasis in Drosophila, in vitro lipid-binding, ubiquitination assays, transgenic mouse deacetylation in Schwann cells, and live imaging in C. elegans\",\n      \"pmids\": [\"20434988\", \"20833361\", \"20303268\", \"21949390\", \"21109632\", \"20819933\", \"19531360\", \"20619750\", \"20431121\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contributions of degradation versus phosphorylation to localization not quantified\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Provided the structural basis for aPKC substrate recognition of PAR-3, defining the kinase groove and consensus sequence that governs phosphorylation-dependent complex regulation.\",\n      \"evidence\": \"X-ray crystallography of PKCι–PAR-3 peptide complex at 2.4 Å with mutagenesis and in vitro kinase assays\",\n      \"pmids\": [\"22579248\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of full-length PAR-3 scaffold not determined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Connected PAR-3 to Hippo signaling, showing cytoplasmic PARD3 promotes PP1A–LATS1 association to inactivate LATS1 and activate TAZ, defining a junction-independent signaling role.\",\n      \"evidence\": \"Co-IP of the ternary complex, phosphorylation status measurement, and domain separation experiments; centrosome orientation and Girdin transcriptional roles\",\n      \"pmids\": [\"26116754\", \"25793442\", \"25977476\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab co-IP without reciprocal in vivo validation\", \"How cytoplasmic versus junctional pools are partitioned unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Validated the PARD3–Hippo axis in vivo, showing PARD3 acts upstream of YAP/TAZ to control radial glial division mode and cortical development, and extended polarity control to flow-dependent endothelial planar polarity via GSK3β.\",\n      \"evidence\": \"In vivo conditional knockout with YAP/TAZ epistasis and live imaging in mouse cortex; co-IP and flow assays in endothelial cells\",\n      \"pmids\": [\"29899142\", \"30018153\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical link between junctional PARD3 and YAP/TAZ regulation not fully reconstituted\", \"Endothelial findings rest on single-lab functional assays\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the multiple kinase, phosphatase, lipid, adhesion, and degradation inputs are integrated in real time to produce a single sharp polarity boundary, and how PAR-3 partitions between junctional and cytoplasmic signaling pools, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No quantitative model integrating competing inputs\", \"Full-length PAR-3 structure unknown\", \"Mechanism partitioning junctional polarity from cytoplasmic Hippo signaling undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 7, 8, 16]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [30, 40, 39]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [8, 21, 25, 22]},\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [10, 14, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 30, 40, 10]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [50, 54]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [25, 26]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [10, 11, 14, 13]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [50, 53, 54]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [20, 24, 5, 53]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 5, 6, 51]}\n    ],\n    \"complexes\": [\n      \"PAR-3/PAR-6/aPKC polarity complex\"\n    ],\n    \"partners\": [\n      \"PRKCI\",\n      \"PARD6\",\n      \"F11R\",\n      \"PVRL1\",\n      \"TIAM1\",\n      \"PTEN\",\n      \"LIMK2\",\n      \"KIF3A\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}