{"gene":"AHNAK","run_date":"2026-06-09T22:02:42","timeline":{"discoveries":[{"year":1992,"finding":"AHNAK encodes an unusually large (~700 kDa) protein with a large internal domain composed of highly conserved 128-amino-acid repeated elements displaying a redundant proline-at-every-seventh-residue motif; preliminary fractionation indicated predominantly nuclear residence.","method":"cDNA cloning, sequence analysis, subcellular fractionation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — original characterization with sequence analysis and fractionation, single lab but foundational structural description","pmids":["1608957"],"is_preprint":false},{"year":1993,"finding":"AHNAK protein is located principally in the nucleus and is phosphorylated on both serine and threonine; protein abundance increases when cells withdraw from the division cycle (serum withdrawal or differentiation), while the degree of phosphorylation diminishes in those settings.","method":"Immunofluorescence, subcellular fractionation, [32P]-orthophosphate metabolic labeling","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct fractionation and radiolabeling, single lab, multiple orthogonal methods","pmids":["8381120"],"is_preprint":false},{"year":1993,"finding":"Desmoyokin, a 680 kDa desmosomal plaque protein, is identical to AHNAK; its distribution in keratinocytes (closely associated with the plasma membrane) differs from non-keratinocyte cells where it is diffusely cytoplasmic, suggesting cell-type-specific localization and function.","method":"cDNA immunoscreening, sequence homology, immunofluorescence, Southern blot","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — sequence identity established, immunofluorescence localization, single lab with multiple methods","pmids":["8408266"],"is_preprint":false},{"year":1995,"finding":"PKC activation (by TPA or high calcium) is required for translocation of desmoyokin/AHNAK from the cytoplasm/nucleus to the plasma membrane in keratinocytes; selective PKC inhibitors completely block this translocation, and calcium-induced phosphorylation of AHNAK was confirmed by [32P] labeling.","method":"PKC inhibitor treatment, TPA stimulation, calcium switch, immunofluorescence, [32P]-orthophosphate immunoprecipitation","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological dissection with inhibitors, metabolic labeling, single lab with multiple orthogonal methods","pmids":["7698224"],"is_preprint":false},{"year":1995,"finding":"In human epidermis, desmoyokin/AHNAK localizes to the non-desmosomal and non-hemidesmosomal plasma membrane of keratinocytes, not to desmosomes themselves, established by post-embedding immunoelectron microscopy with double-labeling against desmosomal markers.","method":"Post-embedding immunoelectron microscopy, double immunolabeling with desmosomal markers","journal":"The Journal of investigative dermatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — high-resolution ultrastructural localization, single lab, rigorous double-labeling controls","pmids":["7769263"],"is_preprint":false},{"year":1999,"finding":"AHNAK binds and activates phospholipase C-gamma1 (PLC-γ1) in the presence of arachidonic acid; arachidonic acid promotes a physical interaction between AHNAK and PLC-γ1, and activation is attributable to reduction of the enzyme's apparent Km toward PIP2. Recombinant AHNAK fragments containing one or four repeated motifs activated PLC-γ1 at nanomolar concentrations, establishing multiple activation sites per molecule.","method":"GST fusion protein pulldown, in vitro PLC-γ1 activity assay, recombinant protein purification","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro enzymatic activation assay with recombinant proteins and mutagenesis-level domain dissection, replicated with multiple fragments","pmids":["10318799"],"is_preprint":false},{"year":1999,"finding":"AHNAK (pp700) interacts specifically with the beta2 subunit of cardiac L-type Ca2+ channels as revealed by co-precipitation with anti-channel subunit antibodies; membrane-associated AHNAK undergoes substantial in vivo PKA phosphorylation upon beta-adrenergic stimulation (isoproterenol), specifically in the fraction that co-precipitates with the Ca2+ channel beta subunit.","method":"Co-immunoprecipitation, back-phosphorylation assay, immunofluorescence on cardiomyocytes, RT-PCR","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP and in vivo phosphorylation assay, single lab, multiple methods","pmids":["10593863"],"is_preprint":false},{"year":2000,"finding":"The C-terminal domain of desmoyokin/AHNAK is responsible for its nuclear localization in low-calcium conditions and for its calcium/PKC-induced translocation from nucleus toward the cytoplasm and cell membrane; N-terminal and central domains alone showed no calcium-dependent redistribution.","method":"Transient transfection of N-terminal, central, and C-terminal domain expression constructs in COS-7, HeLa, and keratinocytes; immunofluorescence in low vs. normal calcium conditions","journal":"The Journal of investigative dermatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-deletion mapping with direct live-cell localization, single lab, multiple cell types","pmids":["10771490"],"is_preprint":false},{"year":2001,"finding":"AHNAK is the major and most specific Ca2+-dependent target of S100B in fibroblast and astrocytoma cells; interaction requires both Ca2+ and Zn2+ (2 Zn2+ per S100B enhance Ca2+-dependent binding), and the binding domains on AHNAK map to its repeated motifs. AHNAK does not bind calmodulin, S100A6, or S100A11 under these conditions.","method":"S100B-Sepharose pulldown, anti-S100B immunoprecipitation, truncated AHNAK fragment binding assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal pulldown and IP, domain mapping with truncations, single lab","pmids":["11312263"],"is_preprint":false},{"year":2001,"finding":"PKB/Akt phosphorylates AHNAK in vitro and in vivo on serine 5535; this phosphorylation mediates nuclear export of AHNAK via a nuclear export signal (NES) and is a major determinant of AHNAK's extranuclear localization in epithelial cells.","method":"In vitro kinase assay, phospho-specific mutagenesis (Ser5535), NES identification, subcellular fractionation, immunofluorescence","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay combined with site-directed mutagenesis of the phosphorylation site and NES, direct localization readout, single lab with multiple orthogonal methods","pmids":["11535620"],"is_preprint":false},{"year":2002,"finding":"The C-terminal region of AHNAK (aa 5262–5643) interacts with the beta2a subunit of the cardiac L-type Ca2+ channel with Kd ~55 nM (for the beta2a C-terminal truncate), and the same region binds G-actin and co-sediments with F-actin, providing a structural link between the L-type Ca2+ channel and the actin-based cytoskeleton.","method":"GST pulldown, equilibrium sedimentation/analytical ultracentrifugation (Kd determination), F-actin co-sedimentation, confocal immunofluorescence","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution binding assay with quantitative affinity determination plus independent actin co-sedimentation, single rigorous study with multiple orthogonal methods","pmids":["12153988"],"is_preprint":false},{"year":2003,"finding":"AHNAK forms a multimeric complex with actin and the annexin 2/S100A10 heterotetramer at the cytosolic face of the plasma membrane; the S100A10 subunit mediates the annexin 2–AHNAK interaction at the AHNAK C-terminal domain. siRNA-mediated knockdown of annexin 2/S100A10 prevents AHNAK plasma membrane association, and AHNAK siRNA prevents cortical actin cytoskeleton reorganization required for cell height in MDCK cells.","method":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence in MDCK cells, confocal microscopy","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, siRNA loss-of-function with specific cellular phenotype (cortical actin), independently confirmed in multiple knockdown conditions","pmids":["14699089"],"is_preprint":false},{"year":2004,"finding":"Four central repeated units (4 CRUs) of AHNAK act as a scaffolding motif that binds both PKC-α and PLC-γ1; AHNAK-bound PKC-α stimulates arachidonic acid release near PLC-γ1, and the concerted action of 4 CRUs with arachidonic acid activates PLC-γ1, leading to IP3 generation and intracellular Ca2+ mobilization in a PLC-γ1-dependent manner.","method":"GST pulldown, siRNA depletion of PLC-γ1, inositol phosphate (IP) measurement, Ca2+ mobilization assay in NIH3T3 cells expressing 4 CRUs","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro binding assay plus functional reconstitution in cells with RNAi validation of the downstream effector, single lab, multiple orthogonal methods","pmids":["15033986"],"is_preprint":false},{"year":2004,"finding":"The C-terminal ahnak fragment (ahnak-C2) induces actin filament bundling into paracrystalline-like structures in vitro and stabilizes isometric force development in demembranated skeletal muscle fibers. An endogenous 72 kDa C-terminal ahnak fragment co-purifies with myofibrillar proteins and localizes to intercalated discs and near the Z-line in cardiomyocytes.","method":"Recombinant protein/actin bundling assay (electron microscopy), demembranated fiber force measurement, immunocytochemistry/confocal microscopy","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of actin bundling with EM verification plus functional fiber mechanics assay, single lab with multiple orthogonal methods","pmids":["15001564"],"is_preprint":false},{"year":2004,"finding":"The carboxyl-terminal ahnak fragments P3 (aa 5456–5556) and P4 (aa 5556–5643) modulate the L-type Ca2+ current in rat ventricular cardiomyocytes: P4 increases current amplitude by ~23% while both P3 and P4 slow current inactivation. These effects are mediated via the ahnak–beta2 subunit interaction rather than the ahnak–F-actin interaction, as actin-stabilizing agents did not alter their effect.","method":"Whole-cell patch clamp on rat cardiomyocytes, intracellular perfusion of recombinant ahnak peptides, pharmacological controls (phalloidin, jasplakinolide)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted functional calcium channel regulation with defined peptide fragments and pharmacological dissection of mechanism, rigorous controls","pmids":["14722071"],"is_preprint":false},{"year":2004,"finding":"AHNAK interacts specifically with the DNA ligase IV–XRCC4 complex (but not with other DNA ligases or other NHEJ components), stimulates the double-stranded ligation activity of DNA ligase IV–XRCC4, has weak DNA-binding activity, and forms a stable complex with DNA ligase IV–XRCC4 on DNA.","method":"Immunoaffinity purification, co-immunoprecipitation, in vitro DNA ligation assay, DNA-binding assay","journal":"DNA repair","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro ligation assay plus co-IP, single lab","pmids":["15177040"],"is_preprint":false},{"year":2005,"finding":"A naturally occurring missense variant Ile5236Thr in AHNAK critically reduces beta2 subunit binding affinity (~50% decrease after PKA phosphorylation or with the mutant peptide) and, when applied intracellularly, mimics PKA effects on L-type Ca2+ current (increases amplitude ~60%, slows inactivation, leftward voltage shift) and prevents further up-regulation by isoprenaline.","method":"GST pulldown binding with wild-type vs. mutant ahnak fragments, whole-cell patch clamp on native cardiomyocytes with intracellular peptide application","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro binding with mutant vs. wild-type combined with electrophysiological functional readout, multiple complementary methods in one study","pmids":["16319140"],"is_preprint":false},{"year":2006,"finding":"AHNAK is a component of the dysferlin protein complex in skeletal muscle; the C2A domain of dysferlin binds the C-terminal domain of AHNAK (defined by GST pulldown); reduction or absence of dysferlin causes secondary muscle-specific loss of AHNAK from the sarcolemma; during regeneration, both proteins redistribute to the cytoplasm in concert.","method":"Co-immunoprecipitation coupled with mass spectrometry, GST pulldown domain mapping, immunofluorescence on human and rat muscle biopsies","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP/MS identification, domain mapping by GST pulldown, corroborated in human disease tissue and regeneration model","pmids":["17185750"],"is_preprint":false},{"year":2006,"finding":"A specific 20-amino-acid peptide in the AHNAK C-terminal domain (A2tBP1) constitutes the minimal binding motif for the annexin 2/S100A10 tetramer (A2t); binding requires both the annexin 2 N-terminal tail and S100A10 together (neither alone is sufficient); a second, lower-affinity A2t-binding motif (A2tBP2) exists in the N-terminal AHNAK domain. Overexpressed A2tBP1-EGFP co-fractionates with and co-immunoprecipitates S100A10/annexin 2 in a calcium-dependent manner, and relocalizes to the plasma membrane under oxidative/mechanical stress.","method":"Yeast triple-hybrid assay, in vitro binding assay, EGFP fusion overexpression/co-IP, live-cell imaging","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — yeast triple-hybrid plus in vitro binding plus cell-based co-IP, multiple orthogonal methods, single rigorous study","pmids":["16984913"],"is_preprint":false},{"year":2008,"finding":"AHNAK1 is required for plasma membrane expression of L-type calcium channel alpha1S (Cav1.1) subunit in CD4+ T cells, likely through interaction with the beta regulatory subunit; AHNAK1-deficient mice exhibit reduced Ca2+ influx upon TCR crosslinking and poor NFAT activation.","method":"AHNAK1 knockout mouse model, flow cytometry for Cav1.1 surface expression, Ca2+ flux measurement, NFAT reporter assay","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with multiple mechanistic readouts (channel surface expression, Ca2+ influx, NFAT activation), single lab with orthogonal methods","pmids":["18191595"],"is_preprint":false},{"year":2008,"finding":"AHNAK central repeated units (CRUs) bind and activate PKC-α in a phosphatidylserine/DAG-independent manner and disrupt the PKC-α–protein phosphatase 2A (PP2A) inhibitory complex, thereby potentiating PKC-α activation and downstream Raf/MEK/Erk phosphorylation; Ahnak-null MEFs show enhanced PKC–PP2A complex formation and reduced membrane translocation of PKC-α in response to stimuli.","method":"Co-immunoprecipitation, GST pulldown, PKC activity assay, Ahnak knockout MEFs, immunofluorescence for PKC translocation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, knockout MEF rescue experiments, multiple orthogonal assays, replicated with add-back expression","pmids":["18174170"],"is_preprint":false},{"year":2009,"finding":"AHNAK1 is required for Ca2+ entry into mature cytolytic CD8+ T cells (CTLs); AHNAK1-deficient CTLs show markedly reduced Cav1.1 alpha1S subunit expression, reduced granzyme-B production, cytolytic activity, and IFN-γ secretion after TCR stimulation.","method":"AHNAK1 knockout mouse model, Ca2+ flux assay, flow cytometry (granzyme-B, IFN-γ), cytolysis assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with multiple specific functional readouts, single lab, multiple orthogonal methods","pmids":["19497879"],"is_preprint":false},{"year":2009,"finding":"The C-type natriuretic peptide receptor (NPR-C) tethers AHNAK1 at the plasma membrane via the AHNAK1 C1 domain; siRNA knockdown of NPR-C results in AHNAK1 nuclear accumulation, and knockdown of either NPR-C or AHNAK1 attenuates arachidonic acid/phorbol ester-induced intracellular Ca2+ mobilization.","method":"Co-immunoprecipitation/MS, GST pulldown domain mapping, sucrose density gradient fractionation, siRNA knockdown, Ca2+ mobilization assay","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP/MS plus domain pulldown plus siRNA functional assay, single lab","pmids":["19710363"],"is_preprint":false},{"year":2009,"finding":"In osteoblastic MC3T3-E1 cells, AHNAK associates with the Cav1.2/beta2-subunit complex at the plasma membrane via the beta2 subunit; siRNA knockdown of AHNAK significantly impairs Ca2+ influx without disrupting the actin cytoskeleton or disassembling the Cav1.2/beta2 complex.","method":"Co-immunoprecipitation, FRET (fluorescence resonance energy transfer), siRNA knockdown, Ca2+ influx measurement, immunohistochemistry","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — FRET plus Co-IP plus siRNA functional Ca2+ assay, single lab","pmids":["19261907"],"is_preprint":false},{"year":2009,"finding":"AHNAK is constitutively expressed by myelinating Schwann cells; siRNA silencing of AHNAK affects Schwann cell morphology and laminin-substrate attachment, and alters expression and distribution of dystroglycan, suggesting AHNAK targets the dystroglycan-associated receptor complex at the plasma membrane.","method":"siRNA knockdown in primary Schwann cells, immunofluorescence, western blot for dystroglycan, morphology assay","journal":"Glia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA loss-of-function with defined molecular and morphological readouts, single lab","pmids":["18837049"],"is_preprint":false},{"year":2010,"finding":"AHNAK1 and AHNAK2 are both components of the costameric network in skeletal muscle (co-localize with vinculin); AHNAK1 is absent from the T-tubule system; AHNAK1-deficient fibers show significantly higher transverse stiffness by atomic force microscopy, but AHNAK1 is not required for membrane repair in a laser wounding assay.","method":"Specific antibody immunofluorescence/co-localization, atomic force microscopy, laser wounding assay in AHNAK1-deficient fibers","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout with AFM quantitative stiffness measurement and localization, single lab, multiple methods","pmids":["20833135"],"is_preprint":false},{"year":2011,"finding":"AHNAK interaction with dysferlin is lost upon cleavage by calpain 3 protease; in muscular dystrophies (LGMD2B from dysferlin mutations and LGMD2A from calpain 3 mutations), ahnak1 loses sarcolemmal localization and appears in muscle connective tissue. Ca2+-stimulated vesicle shedding from primary human myotubes releases ahnak1-containing vesicles (~150 nm diameter), establishing a vesicle-release mechanism for abnormal ahnak1 localization.","method":"Immunofluorescence on human muscle biopsies, vesicle purification, electron microscopy, western blot","journal":"Journal of muscle research and cell motility","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — human disease tissue plus vesicle purification and EM, single lab","pmids":["22057634"],"is_preprint":false},{"year":2011,"finding":"A small 17 kDa AHNAK isoform (generated by alternative splicing) interacts with the large 700 kDa AHNAK in the cytoplasm; the small isoform is also present in the nucleus and establishes a positive feedback loop to regulate mRNA splicing at its own locus during muscle differentiation.","method":"RT-PCR, western blot, co-immunoprecipitation of isoforms, transfection experiments during muscle differentiation","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of isoforms plus splicing reporter, single lab with multiple methods","pmids":["21940993"],"is_preprint":false},{"year":2012,"finding":"Crystal structure of a 20-aa AHNAK C-terminal peptide (residues 5654–5673) bound to the annexin A2/S100A10 heterotetramer at 2.5 Å resolution shows that binding is governed by hydrophobic interactions between AHNAK side chains and pockets on S100A10, while hydrogen bonds predominantly involve backbone AHNAK atoms, explaining the binding's specificity for S100A10 over other S100 proteins.","method":"X-ray crystallography (2.5 Å resolution)","journal":"Acta crystallographica. Section D, Biological crystallography","confidence":"High","confidence_rationale":"Tier 1 / Moderate — high-resolution crystal structure providing atomic-level mechanistic detail, single lab","pmids":["23275167"],"is_preprint":false},{"year":2012,"finding":"Ahnak1 interacts with the SH3-HOOK-GK core region of Cavβ2 (C- and N-terminal Cavβ2 regions are dispensable); PKA phosphorylation of Ser-296 in the GK domain of Cavβ2 increases ahnak1 binding affinity ~2.4-fold but reduces binding capacity ~60%, constituting a mechanism by which PKA phosphorylation modulates ahnak1's effect on Cav1.2 channel activity.","method":"In vitro binding assay with Cavβ2 truncation mutants, mass spectrometry (phosphosite identification), surface plasmon resonance (SPR/Kd), immunocytochemistry","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro domain mapping, MS phosphosite identification, quantitative SPR binding, and phospho-mimic mutagenesis, single lab with multiple orthogonal rigorous methods","pmids":["22497893"],"is_preprint":false},{"year":2012,"finding":"Ahnak functions as a scaffolding protein in aortic smooth muscle cells (ASMCs) connecting a complex of Erk, PAK (p21-activated kinase), and PIXβ (PAK-interacting exchange factor β); Ahnak knockout ASMCs show reduced Rac activation, impaired lamellipodial protrusion, and decreased PDGF-dependent migration; neointimal formation and SMC migration after carotid ligation injury are significantly retarded in Ahnak knockout mice.","method":"Co-immunoprecipitation with anti-PAK antibody, Rac activation assay, transwell/wound-healing migration assay, carotid ligation model in Ahnak-/- mice","journal":"Cardiovascular research","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP complex identification, genetic knockout with in vitro and in vivo functional phenotypes, multiple orthogonal methods","pmids":["23042471"],"is_preprint":false},{"year":2014,"finding":"Ahnak directly interacts with Smad3 through its MH2 domain and stimulates Smad3 nuclear localization, potentiating TGFβ-induced transcriptional activity; Ahnak overexpression causes c-Myc and cyclin D1/D2 downregulation and cell cycle arrest; Ahnak-null mice in the MMTV-middle T background show significantly accelerated mammary hyperplasia.","method":"Co-immunoprecipitation, nuclear fractionation/immunofluorescence, reporter assay, western blot (c-Myc, cyclin D1/D2), MMTV-Tg/Ahnak-/- mouse model","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP of Smad3-Ahnak, nuclear localization assay, transcriptional reporter, genetic mouse model with specific mammary phenotype, multiple orthogonal methods","pmids":["24662814"],"is_preprint":false},{"year":2014,"finding":"Crystal structures of the PDZ-like domain of AHNAK2 reveal intertwined, domain-swapped homodimers; the AHNAK2 PDZ domain contains a bound class III ligand peptide in the preformed binding pocket with two salt bridges and weak C-terminus recognition, providing a structural basis for homodimerization and scaffolding function.","method":"X-ray crystallography of PDZ-like domains from PRX and AHNAK2","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — crystal structure, but AHNAK2 (not AHNAK1) and limited functional validation","pmids":["24675079"],"is_preprint":false},{"year":2015,"finding":"AHNAK directly interacts with SMAD1 and facilitates Smad1 binding to the PPARγ2 promoter, thereby stimulating BMP2-mediated adipocyte differentiation; loss of AHNAK impairs Smad1 phosphorylation and nuclear localization, downregulates PPARγ expression, and severely impairs adipocyte differentiation.","method":"Co-immunoprecipitation, chromatin immunoprecipitation (ChIP) on PPARγ promoter, siRNA knockdown, Ahnak-/- adipose-derived stem cells, Oil Red O staining","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP plus ChIP showing direct promoter interaction, knockout stem cells, multiple orthogonal assays, single lab","pmids":["26466345"],"is_preprint":false},{"year":2016,"finding":"AHNAK is the most abundant protein component of extracellular vesicles produced by mammary carcinoma cells and is necessary for their formation; AHNAK-depleted carcinoma cells produce fewer vesicles that are less capable of promoting recipient fibroblast migration.","method":"Proteomic analysis (non-biased MS) of vesicle contents, AHNAK knockdown, fibroblast migration assay","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS-based vesicle proteomics and siRNA knockdown with functional migration assay, single lab","pmids":["27374178"],"is_preprint":false},{"year":2018,"finding":"UBE3C ubiquitin E3 ligase ubiquitinates AHNAK and promotes its proteasomal degradation; AHNAK functions as a cofactor assisting p53 binding to stemness-related gene promoters to inhibit transcription; UBE3C-mediated AHNAK degradation removes this p53-mediated inhibition, enhancing cancer stem cell properties.","method":"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, ChIP for AHNAK-p53 on promoters, in vivo xenograft","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP ubiquitination assay and ChIP, single lab, multiple methods","pmids":["30503554"],"is_preprint":false},{"year":2018,"finding":"Ahnak induces EMT in response to TGFβ by activating Smad3 phosphorylation and enhancing Smad3 transcriptional activity; stable knockdown of Ahnak in B16F10 cells reduces N-cadherin expression and Smad3 phosphorylation, and abrogates TGFβ-induced migration, invasion, and lung metastasis in C57BL/6 mice.","method":"siRNA/shRNA knockdown, western blot (Smad3-phos, N-cadherin, EMT markers), migration/invasion assay, tail-vein lung metastasis model","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — stable knockdown with in vitro and in vivo metastasis assay, single lab","pmids":["30258109"],"is_preprint":false},{"year":2019,"finding":"RNF38 RING-finger E3 ubiquitin ligase ubiquitinates and degrades AHNAK, thereby relieving AHNAK-mediated inhibition of TGFβ signaling and promoting HCC cell migration and invasion; re-introduction of AHNAK interference restores invasion capacity diminished by RNF38 downregulation.","method":"SILAC proteomics, Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, in vitro/in vivo invasion assays","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — quantitative proteomics plus Co-IP ubiquitination assay plus rescue experiment, single lab","pmids":["30836988"],"is_preprint":false},{"year":2019,"finding":"Ahnak scaffolds the p11 (S100A10)/Anxa2 complex and L-type VGCC: through its N-terminal region it interacts with the pore-forming α1 subunit, and through its C-terminal region it interacts with the β subunit and the p11/Anxa2 complex. Ahnak knockout neurons show reduced α1 surface expression and L-type Ca2+ current, and constitutive or forebrain-specific Ahnak KO mice display depression-like behavior similar to p11 KO mice.","method":"Co-immunoprecipitation, domain mapping, electrophysiology (L-type Ca2+ current), confocal microscopy, Ahnak conditional/constitutive knockout mice, behavioral testing","journal":"Molecular psychiatry","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP domain mapping, electrophysiology in KO neurons, cell-type-specific KO mice with behavioral phenotype, multiple orthogonal methods, single lab","pmids":["30760886"],"is_preprint":false},{"year":2019,"finding":"AHNAK C-terminal peptide (residues 5654–5673) preferentially and strongly binds negatively charged phospholipids with unsaturated acyl chains, established by Langmuir monolayer tensiometry, ellipsometry, and 31P solid-state NMR on lipid bilayers.","method":"Langmuir monolayer surface tensiometry, ellipsometry, 31P solid-state NMR","journal":"Langmuir","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — biophysical reconstitution with multiple orthogonal methods, single lab, no cellular validation","pmids":["31825630"],"is_preprint":false},{"year":2021,"finding":"AHNAK binds to the 53BP1 oligomerization domain and controls 53BP1 multimerization and phase separation; loss of AHNAK results in hyper-accumulation of 53BP1 on chromatin, enhanced phase separation, and elevated p53 response, leading to senescence in non-transformed cells and sensitizing cancer cells.","method":"Co-immunoprecipitation (G1 phase enrichment), chromatin fractionation, live-cell imaging of 53BP1 condensates, AHNAK knockout/knockdown, phase separation assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP defining binding domain, chromatin fractionation, phase separation assay, KO with specific p53/senescence phenotype, multiple orthogonal methods","pmids":["33961796"],"is_preprint":false},{"year":2021,"finding":"Ahnak regulates tumor metastasis colonization through PCSK9 expression: Ahnak-/- mice show higher resistance to pulmonary B16F10 metastasis; transcriptomic analysis of Ahnak-/- pulmonary endothelial cells reveals PCSK9 downregulation, and lung epithelium-specific PCSK9 conditional KO mice also show suppressed B16F10 pulmonary metastasis.","method":"Tail-vein metastasis model in Ahnak-/- mice, transcriptomic analysis of primary endothelial cells, tissue-specific conditional PCSK9 KO mouse model","journal":"Neoplasia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO models (two independent lines), transcriptomics, single lab","pmids":["34352405"],"is_preprint":false},{"year":2022,"finding":"In mitotic HeLa cells, annexin A2 (Anx2) recruits AHNAK to the cell cortex facing spindle poles; depletion of either protein or impaired cortical AHNAK localization causes delayed anaphase onset and unstable spindle anchoring, resulting in altered spindle orientation; AHNAK is found in a complex with dynein-dynactin, and both AHNAK and Anx2 are required for correct NuMA and dynein cortical localization and dynamics.","method":"siRNA depletion, live-cell imaging, co-immunoprecipitation (AHNAK-dynein-dynactin), immunofluorescence (NuMA, dynein cortical localization)","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP of AHNAK-dynein-dynactin complex, siRNA loss-of-function with quantitative spindle orientation and NuMA/dynein localization readouts, single lab with multiple orthogonal methods","pmids":["35362526"],"is_preprint":false},{"year":2014,"finding":"AHNAK1 modulates L-type Ca2+ channel inactivation in cardiomyocytes; in vitro binding studies show that the most C-terminal 188 aa of ahnak1 containing a PxxP motif (188-PSTP) binds Cavβ2 with Kd ~60 nM, while proline-to-alanine substitutions reduce affinity ~20-fold; both 188-PSTP and 188-ASTA affect I(CaL) only in ahnak1-expressing cardiomyocytes and not in ahnak1-deficient cardiomyocytes, demonstrating that endogenous ahnak1 is required.","method":"In vitro binding assay, whole-cell patch clamp (rat, WT mouse, ahnak1-/- mouse cardiomyocytes), intracellular peptide perfusion, proline-to-alanine mutagenesis","journal":"Pflugers Archiv : European journal of physiology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro binding with mutagenesis plus electrophysiology in wild-type and knockout cardiomyocytes, multiple orthogonal methods","pmids":["20607281"],"is_preprint":false},{"year":2014,"finding":"AHNAK1 co-localizes with β-dystroglycan in Cajal bands of myelinated Schwann cells; β-dystroglycan co-immunoprecipitates with AHNAK1, shows reduced expression in ahnak1-/- Schwann cells, and is undetectable in Cajal bands of ahnak1-/- sciatic nerve. AHNAK1-deficient Schwann cells show reduced migration velocity on laminin, greater mechanical rigidity of processes, and decreased internodal lengths, suggesting AHNAK1 links dystroglycan to F-actin to regulate Schwann cell morphology and myelination.","method":"Co-immunoprecipitation, immunofluorescence/electron microscopy, scratch wound migration assay, atomic force microscopy, siRNA knockdown in developing sciatic nerve","journal":"Glia","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP plus EM plus genetic knockout plus AFM plus in vivo siRNA, multiple orthogonal methods confirming the mechanistic link","pmids":["24796807"],"is_preprint":false}],"current_model":"AHNAK is a giant (~700 kDa) scaffolding phosphoprotein whose subcellular localization (nucleus, cytoplasm, or plasma membrane) is regulated by PKB/Akt-mediated phosphorylation of Ser5535 (driving nuclear export) and by PKC activation and Ca2+-dependent cell–cell contacts; at the plasma membrane it forms multimeric complexes with annexin A2/S100A10 (binding defined by a 2.5 Å crystal structure), the dysferlin complex, and β-dystroglycan to organize the cortical actin cytoskeleton; through its C-terminal domain it binds the Cavβ2 subunit of L-type Ca2+ channels (Kd ~35–60 nM), acting as a tonic inhibitory brake on Cav1.2 current that is relieved by PKA phosphorylation of either AHNAK or Cavβ2, thereby coupling β-adrenergic signaling to channel regulation; its central repeated units scaffold PLC-γ1 and PKC-α (disrupting a PKC–PP2A inhibitory complex) to amplify Ca2+ and Erk/Rac signaling; it potentiates TGFβ/Smad3 signaling by promoting Smad3 nuclear accumulation and interacts with SMAD1 on the PPARγ promoter to drive adipogenesis; it restrains 53BP1 oligomerization and phase separation to modulate the p53 DNA-damage response; and it is ubiquitinated and degraded by UBE3C and RNF38 E3 ligases, providing post-translational control of its tumor-suppressive and pro-metastatic activities depending on cellular context."},"narrative":{"mechanistic_narrative":"AHNAK is a giant (~700 kDa) scaffolding phosphoprotein built from highly conserved central repeated units whose subcellular distribution between nucleus, cytoplasm, and plasma membrane is dynamically controlled by phosphorylation: PKB/Akt phosphorylation of Ser5535 drives nuclear export through an adjacent NES [PMID:11535620], while PKC activation and Ca2+-dependent signals translocate it toward the cell membrane via determinants in its C-terminal domain [PMID:7698224, PMID:10771490]. At the cytosolic face of the plasma membrane AHNAK assembles a cortical actin-organizing platform: its C-terminal domain binds G- and F-actin and the annexin A2/S100A10 (A2t) heterotetramer through a defined 20-residue motif (resolved at 2.5 Å), and these interactions are required for cortical actin reorganization and cell architecture [PMID:12153988, PMID:14699089, PMID:16984913, PMID:23275167]. Through its central repeated units AHNAK functions as a signaling scaffold, binding and activating PLC-γ1 in an arachidonic-acid-dependent manner and recruiting PKC-α—disrupting the inhibitory PKC-α/PP2A complex—to amplify Ca2+ mobilization and Raf/MEK/Erk and Rac signaling [PMID:10318799, PMID:15033986, PMID:18174170, PMID:23042471]. A second major role is regulation of L-type voltage-gated Ca2+ channels: AHNAK binds the Cavβ2 subunit (Kd ~55–60 nM via a C-terminal PxxP motif) to act as a brake on Cav1.2 current that is relieved by PKA phosphorylation of either partner, and is required for surface expression and Ca2+ influx of L-type channels in T cells, neurons, and other cell types [PMID:10593863, PMID:12153988, PMID:14722071, PMID:16319140, PMID:22497893, PMID:20607281, PMID:30760886, PMID:18191595, PMID:19497879]. AHNAK is a structural component of muscle membrane complexes including the dysferlin complex and the costamere/β-dystroglycan network, linking these to the actin cytoskeleton and influencing membrane mechanics and Schwann cell morphology [PMID:17185750, PMID:20833135, PMID:24796807]. In the nucleus AHNAK shapes growth and stress responses: it potentiates TGFβ/Smad3 signaling by promoting Smad3 nuclear accumulation and drives BMP2/Smad1-dependent adipogenesis at the PPARγ promoter [PMID:24662814, PMID:26466345, PMID:30258109], and it restrains 53BP1 oligomerization and phase separation to tune the p53 DNA-damage response and senescence [PMID:33961796]. Its protein levels are controlled by the UBE3C and RNF38 E3 ubiquitin ligases, providing post-translational control over its context-dependent tumor-suppressive and pro-metastatic activities [PMID:30503554, PMID:30836988].","teleology":[{"year":1992,"claim":"Establishing that AHNAK is an exceptionally large protein dominated by conserved 128-aa repeats framed the central question of how a repeat-based giant functions, suggesting a modular scaffold rather than an enzyme.","evidence":"cDNA cloning, sequence analysis, and subcellular fractionation","pmids":["1608957"],"confidence":"Medium","gaps":["No molecular function assigned to the repeats at this stage","Localization assignment was preliminary"]},{"year":1993,"claim":"Defining AHNAK as a serine/threonine phosphoprotein whose abundance and phosphorylation track cell-cycle exit, and its identity with the desmosomal-plaque protein desmoyokin, connected it to phosphorylation control and cell-type-specific membrane localization.","evidence":"Immunofluorescence, fractionation, [32P] labeling, and cDNA immunoscreening across cell types","pmids":["8381120","8408266"],"confidence":"Medium","gaps":["Responsible kinases unidentified","Functional consequence of localization shift unknown"]},{"year":1995,"claim":"Demonstrating that PKC activation and Ca2+ are required for AHNAK translocation to the plasma membrane, where it localizes to non-desmosomal membrane, recast it as a signal-responsive membrane-associated protein.","evidence":"PKC inhibitor/TPA/calcium-switch experiments and immunoelectron microscopy in keratinocytes","pmids":["7698224","7769263"],"confidence":"Medium","gaps":["Direct PKC phosphosites not mapped","Membrane tethering partner unknown"]},{"year":1999,"claim":"Identifying that AHNAK binds and activates PLC-γ1 in an arachidonic-acid-dependent manner and co-precipitates with the cardiac L-type Ca2+ channel β2 subunit revealed two distinct effector engagements—lipid-signaling enzyme activation and ion-channel regulation.","evidence":"GST pulldown with in vitro PLC-γ1 activity assay; co-IP and PKA back-phosphorylation in cardiomyocytes","pmids":["10318799","10593863"],"confidence":"High","gaps":["Cellular significance of PLC-γ1 activation not yet shown","Functional effect on channel current not yet measured"]},{"year":2001,"claim":"Mapping PKB/Akt phosphorylation of Ser5535 to an NES-dependent nuclear export, and identifying AHNAK as the major Ca2+/Zn2+-dependent S100B target via its repeats, defined the molecular switch governing AHNAK's nucleocytoplasmic distribution and its S100-family specificity.","evidence":"In vitro kinase assay with Ser5535 mutagenesis and NES mapping; S100B pulldown/IP with truncation mapping","pmids":["11535620","11312263"],"confidence":"High","gaps":["Upstream signals controlling Akt-dependent export not defined","Functional role of S100B binding unresolved"]},{"year":2002,"claim":"Quantifying the C-terminal AHNAK–Cavβ2a interaction (Kd ~55 nM) and showing the same region binds actin established AHNAK as a physical bridge between the L-type Ca2+ channel and the cortical cytoskeleton.","evidence":"GST pulldown, analytical ultracentrifugation Kd determination, and F-actin co-sedimentation","pmids":["12153988"],"confidence":"High","gaps":["Functional consequence for channel current not measured here","Stoichiometry within the membrane complex unknown"]},{"year":2004,"claim":"Reconstituting four central repeated units as a dual PKC-α/PLC-γ1 scaffold, defining C-terminal actin-bundling and force-stabilizing activity, and showing C-terminal peptides directly modulate cardiac I(CaL) via the β2 subunit, established AHNAK repeats and C-terminus as functional signaling and cytoskeletal modules.","evidence":"GST pulldowns, siRNA-validated Ca2+/IP3 assays, in vitro actin bundling with EM and skinned-fiber mechanics, and whole-cell patch clamp with peptide perfusion","pmids":["15033986","15001564","14722071"],"confidence":"High","gaps":["In vivo contribution of repeat scaffolding not yet tested by knockout","Link between actin bundling and channel modulation incompletely separated"]},{"year":2004,"claim":"Showing AHNAK binds the DNA ligase IV–XRCC4 complex and stimulates its ligation activity introduced a candidate role in non-homologous end joining, expanding AHNAK beyond membrane/cytoskeletal functions.","evidence":"Immunoaffinity purification, co-IP, and in vitro DNA ligation/DNA-binding assays","pmids":["15177040"],"confidence":"Medium","gaps":["No cellular NHEJ phenotype demonstrated","Weak DNA binding leaves recruitment mechanism unclear"]},{"year":2006,"claim":"Defining the minimal C-terminal A2t-binding motif and identifying AHNAK as a dysferlin-complex component established the precise interfaces by which AHNAK is tethered at the plasma membrane and the sarcolemma.","evidence":"Yeast triple-hybrid, in vitro binding, EGFP co-IP/imaging; co-IP/MS and GST pulldown in muscle with disease-tissue corroboration","pmids":["16984913","17185750"],"confidence":"High","gaps":["Functional output of dysferlin–AHNAK binding in repair vs. structure unresolved","Regulation of A2t motif engagement in vivo unclear"]},{"year":2008,"claim":"Genetic AHNAK1 ablation in T cells and analysis of Ahnak-null MEFs demonstrated that AHNAK is required for L-type channel surface expression and Ca2+ entry/NFAT signaling and potentiates PKC-α/Erk by disrupting the PKC–PP2A complex, moving AHNAK from biochemical scaffold to physiologically required signaling regulator.","evidence":"AHNAK1 knockout mice with Cav1.1 surface/Ca2+ flux/NFAT readouts; co-IP, PKC activity, and knockout MEF rescue","pmids":["18191595","18174170"],"confidence":"High","gaps":["Mechanism of channel trafficking by AHNAK not resolved at molecular level","Tissue-specific redundancy with AHNAK2 untested"]},{"year":2009,"claim":"Extending the AHNAK1 requirement to CD8+ CTL effector function, the NPR-C membrane tether, and osteoblast Cav1.2 Ca2+ influx generalized AHNAK as a Ca2+-entry organizer across multiple cell types.","evidence":"AHNAK1 knockout CTL assays; co-IP/MS plus domain mapping for NPR-C; FRET/co-IP/siRNA Ca2+ assays in osteoblasts","pmids":["19497879","19710363","19261907"],"confidence":"Medium","gaps":["Whether AHNAK acts on trafficking versus gating differs across studies","NPR-C tethering generality untested"]},{"year":2010,"claim":"Costameric localization and increased transverse stiffness of AHNAK1-deficient fibers, without a membrane-repair defect, refined AHNAK's muscle role toward mechanical/structural support rather than wound resealing.","evidence":"Immunolocalization, atomic force microscopy, and laser wounding in AHNAK1-deficient fibers","pmids":["20833135"],"confidence":"Medium","gaps":["Molecular basis of altered stiffness not defined","AHNAK1 vs AHNAK2 functional division unresolved"]},{"year":2011,"claim":"Showing calpain-3 cleavage abolishes the dysferlin–AHNAK interaction and that AHNAK is released in shed vesicles linked AHNAK mislocalization to muscular dystrophy pathology and a vesicle-shedding mechanism, while a 17 kDa isoform was found to autoregulate AHNAK splicing.","evidence":"Disease-biopsy immunofluorescence, vesicle purification/EM; isoform co-IP and splicing reporters during myogenesis","pmids":["22057634","21940993"],"confidence":"Medium","gaps":["Causal role of AHNAK loss in dystrophy phenotype not established","Splicing feedback mechanism not mapped to specific factors"]},{"year":2012,"claim":"Atomic-level structure of the AHNAK peptide on annexin A2/S100A10 and SPR-based mapping of the Cavβ2 SH3-HOOK-GK interface with PKA-Ser296 modulation explained both the specificity of membrane tethering and the phosphorylation-tunable channel regulation, while AHNAK's PAK/PIX/Erk scaffolding drove Rac-dependent smooth-muscle migration in vivo.","evidence":"2.5 Å crystallography; truncation binding, MS phosphosite ID, SPR; co-IP, Rac assays, and Ahnak-/- carotid injury model","pmids":["23275167","22497893","23042471"],"confidence":"High","gaps":["Structural basis for Cavβ2 modulation lacks a complex structure","How distinct scaffolds are spatially segregated within one molecule unclear"]},{"year":2014,"claim":"Defining AHNAK1 as required for cardiac I(CaL) modulation via a C-terminal PxxP–Cavβ2 interaction, its β-dystroglycan/F-actin link in Schwann cells, and its Smad3-MH2 interaction promoting TGFβ-driven growth arrest and a mammary tumor-suppressive phenotype, established parallel channel, structural, and nuclear-signaling roles validated genetically.","evidence":"Patch clamp in WT/ahnak1-/- cardiomyocytes with mutagenesis; co-IP/EM/AFM/in vivo siRNA in Schwann cells; co-IP, reporter, and MMTV/Ahnak-/- mouse model","pmids":["20607281","24796807","24662814"],"confidence":"High","gaps":["How nuclear Smad3 role integrates with membrane functions unresolved","Context-dependence of tumor-suppressive vs pro-tumor outputs unexplained"]},{"year":2015,"claim":"Showing AHNAK binds SMAD1 and recruits it to the PPARγ promoter to drive BMP2-dependent adipogenesis extended AHNAK's nuclear scaffolding role to a second Smad pathway and a developmental/differentiation program.","evidence":"Co-IP, ChIP on PPARγ promoter, siRNA, and Ahnak-/- adipose-derived stem cells","pmids":["26466345"],"confidence":"High","gaps":["How AHNAK partitions between Smad1 and Smad3 signaling unclear","Direct DNA versus Smad-mediated promoter engagement not separated"]},{"year":2018,"claim":"Identifying UBE3C-mediated ubiquitination/degradation of AHNAK (relieving p53-dependent repression of stemness genes) and AHNAK-driven TGFβ/Smad3 EMT and metastasis revealed post-translational control of AHNAK's opposing roles in cancer.","evidence":"Co-IP/ubiquitination assays, ChIP, xenografts; shRNA knockdown with EMT markers and lung-metastasis model","pmids":["30503554","30258109"],"confidence":"Medium","gaps":["Reconciling tumor-suppressive p53/Smad3 roles with pro-metastatic activity by context","Direct ubiquitination sites not mapped"]},{"year":2019,"claim":"Showing RNF38 degrades AHNAK to relieve its inhibition of TGFβ signaling, that AHNAK scaffolds the p11/Anxa2 complex with L-type VGCC in neurons to control mood-relevant Ca2+ signaling, and biophysical lipid-binding of its C-terminal peptide further unified its ubiquitin-controlled scaffolding across cancer, neuronal, and membrane contexts.","evidence":"SILAC/co-IP/ubiquitination/rescue in HCC; co-IP domain mapping, electrophysiology, and Ahnak KO mice with behavioral testing; Langmuir/ellipsometry/31P-NMR lipid assays","pmids":["30836988","30760886","31825630"],"confidence":"High","gaps":["Lipid binding lacks cellular validation","Whether neuronal and cardiac channel mechanisms are identical untested"]},{"year":2021,"claim":"Demonstrating that AHNAK binds the 53BP1 oligomerization domain to restrain its multimerization, phase separation, and p53/senescence output, and that AHNAK promotes metastatic colonization through endothelial PCSK9, connected AHNAK directly to DNA-damage-response condensate control and to the tumor microenvironment.","evidence":"Co-IP, chromatin fractionation, live-cell condensate imaging, AHNAK KO; metastasis models with transcriptomics and conditional PCSK9 KO mice","pmids":["33961796","34352405"],"confidence":"High","gaps":["How AHNAK partitions between cytoplasmic scaffold and nuclear 53BP1 regulator unresolved","Mechanism linking AHNAK to PCSK9 transcription unknown"]},{"year":2022,"claim":"Showing annexin A2 recruits AHNAK to spindle-pole-facing cortex where, in complex with dynein-dynactin, it is required for NuMA/dynein cortical localization and proper spindle orientation extended AHNAK's cortical actin-organizing role to mitotic spindle positioning.","evidence":"siRNA depletion, live-cell imaging, AHNAK-dynein-dynactin co-IP, and NuMA/dynein cortical immunofluorescence in HeLa cells","pmids":["35362526"],"confidence":"High","gaps":["Whether AHNAK contacts dynein-dynactin directly is unresolved","Link to cell-cycle-dependent AHNAK phosphorylation not established"]},{"year":null,"claim":"It remains unresolved how a single giant scaffold integrates and switches between its membrane-cytoskeletal, ion-channel, nuclear Smad/53BP1, and ubiquitin-controlled functions to produce its context-dependent tumor-suppressive versus pro-metastatic outcomes.","evidence":"Synthesis across the timeline; no single study resolves the integrating logic","pmids":[],"confidence":"Medium","gaps":["No full-length structure to relate distinct domains spatially","Quantitative phosphorylation map coupling localization to specific functions is missing","Determinants of opposing cancer phenotypes across tissues undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[11,12,20,30,38]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[10,13]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,12,14,16,29,43,40]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[39]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[40]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[3,4,11,18,38]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,9,31,33,40]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,7]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[10,11,13]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[26,34]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[12,20,30,31,33]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[19,21]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[15,40]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[35,36,37,41]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[42]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[33,44]}],"complexes":["annexin A2/S100A10 (A2t) heterotetramer complex","dysferlin complex","L-type Ca2+ channel (Cav1.2/Cavβ2) complex","costamere / β-dystroglycan network"],"partners":["ANXA2","S100A10","CACNB2","PLCG1","PRKCA","SMAD3","TP53BP1","DYSF"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q09666","full_name":"Neuroblast differentiation-associated protein AHNAK","aliases":["Desmoyokin"],"length_aa":5890,"mass_kda":629.1,"function":"May be required for neuronal cell differentiation","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q09666/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/AHNAK","classification":"Not Classified","n_dependent_lines":46,"n_total_lines":1208,"dependency_fraction":0.0380794701986755},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"INPPL1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/AHNAK","total_profiled":1310},"omim":[{"mim_id":"608570","title":"AHNAK NUCLEOPROTEIN 2; AHNAK2","url":"https://www.omim.org/entry/608570"},{"mim_id":"608455","title":"GLYCOGEN PHOSPHORYLASE, MUSCLE; PYGM","url":"https://www.omim.org/entry/608455"},{"mim_id":"601516","title":"SPLICING FACTOR 1; SF1","url":"https://www.omim.org/entry/601516"},{"mim_id":"601442","title":"COFILIN 1; CFL1","url":"https://www.omim.org/entry/601442"},{"mim_id":"601214","title":"NAXOS DISEASE; NXD","url":"https://www.omim.org/entry/601214"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Plasma membrane","reliability":"Enhanced"},{"location":"Cytosol","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/AHNAK"},"hgnc":{"alias_symbol":["MGC5395","AHNAK1"],"prev_symbol":[]},"alphafold":{"accession":"Q09666","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q09666","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q09666-2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q09666-2-F1-predicted_aligned_error_v6.png","plddt_mean":70.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=AHNAK","jax_strain_url":"https://www.jax.org/strain/search?query=AHNAK"},"sequence":{"accession":"Q09666","fasta_url":"https://rest.uniprot.org/uniprotkb/Q09666.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q09666/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q09666"}},"corpus_meta":[{"pmid":"14699089","id":"PMC_14699089","title":"AHNAK interaction with the annexin 2/S100A10 complex regulates cell membrane cytoarchitecture.","date":"2003","source":"The 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Netherlands)","url":"https://pubmed.ncbi.nlm.nih.gov/37962808","citation_count":7,"is_preprint":false},{"pmid":"33987830","id":"PMC_33987830","title":"Gm40600 promotes CD4+ T-cell responses by interacting with Ahnak.","date":"2021","source":"Immunology","url":"https://pubmed.ncbi.nlm.nih.gov/33987830","citation_count":7,"is_preprint":false},{"pmid":"36404486","id":"PMC_36404486","title":"AHNAK-modified microbubbles for the intracranial delivery of triptolide: In-vitro and in-vivo investigations.","date":"2022","source":"International journal of pharmaceutics","url":"https://pubmed.ncbi.nlm.nih.gov/36404486","citation_count":7,"is_preprint":false},{"pmid":"35882062","id":"PMC_35882062","title":"Inhibition of AHNAK nucleoprotein 2 alleviates pulmonary fibrosis by downregulating the TGF-β1/Smad3 signaling pathway.","date":"2022","source":"The journal of gene medicine","url":"https://pubmed.ncbi.nlm.nih.gov/35882062","citation_count":7,"is_preprint":false},{"pmid":"33215408","id":"PMC_33215408","title":"MiR-222-5p promotes the growth and migration of trophoblasts by targeting AHNAK.","date":"2020","source":"European review for medical and pharmacological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/33215408","citation_count":7,"is_preprint":false},{"pmid":"31825630","id":"PMC_31825630","title":"AHNAK C-Terminal Peptide Membrane Binding-Interactions between the Residues 5654-5673 of AHNAK and Phospholipid Monolayers and Bilayers.","date":"2019","source":"Langmuir : the ACS journal of surfaces and colloids","url":"https://pubmed.ncbi.nlm.nih.gov/31825630","citation_count":7,"is_preprint":false},{"pmid":"32067190","id":"PMC_32067190","title":"Intensive morphometric analysis of enormous alterations in skeletal bone system with micro-CT for AHNAK-/- mice.","date":"2020","source":"Anatomical science international","url":"https://pubmed.ncbi.nlm.nih.gov/32067190","citation_count":7,"is_preprint":false},{"pmid":"12617833","id":"PMC_12617833","title":"Multiple developmental roles of Ahnak are suggested by localization to sites of placentation and neural plate fusion in the mouse conceptus.","date":"2002","source":"Gene expression patterns : GEP","url":"https://pubmed.ncbi.nlm.nih.gov/12617833","citation_count":7,"is_preprint":false},{"pmid":"28468000","id":"PMC_28468000","title":"Protective Function of Ahnak1 in Vascular Healing after Wire Injury.","date":"2017","source":"Journal of vascular research","url":"https://pubmed.ncbi.nlm.nih.gov/28468000","citation_count":6,"is_preprint":false},{"pmid":"33853325","id":"PMC_33853325","title":"Peptide Derived from AHNAK Inhibits Cell Migration and Proliferation in Hirschsprung's Disease by Targeting the ERK1/2 Pathway.","date":"2021","source":"Journal of proteome research","url":"https://pubmed.ncbi.nlm.nih.gov/33853325","citation_count":6,"is_preprint":false},{"pmid":"36198257","id":"PMC_36198257","title":"Downregulation of Circ_0088196 Contributes to the Development of Trophoblastic Cells through miR-133b Sponging Function to Affect the AHNAK Expression.","date":"2022","source":"Gynecologic and obstetric investigation","url":"https://pubmed.ncbi.nlm.nih.gov/36198257","citation_count":6,"is_preprint":false},{"pmid":"37308968","id":"PMC_37308968","title":"Ahnak is required to balance calcium ion homeostasis and smooth muscle development in the urinary system.","date":"2023","source":"Cell & bioscience","url":"https://pubmed.ncbi.nlm.nih.gov/37308968","citation_count":5,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50526,"output_tokens":11481,"usd":0.161896,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":22856,"output_tokens":7564,"usd":0.15169,"stage2_stop_reason":"end_turn"},"total_usd":0.313586,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1992,\n      \"finding\": \"AHNAK encodes an unusually large (~700 kDa) protein with a large internal domain composed of highly conserved 128-amino-acid repeated elements displaying a redundant proline-at-every-seventh-residue motif; preliminary fractionation indicated predominantly nuclear residence.\",\n      \"method\": \"cDNA cloning, sequence analysis, subcellular fractionation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — original characterization with sequence analysis and fractionation, single lab but foundational structural description\",\n      \"pmids\": [\"1608957\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"AHNAK protein is located principally in the nucleus and is phosphorylated on both serine and threonine; protein abundance increases when cells withdraw from the division cycle (serum withdrawal or differentiation), while the degree of phosphorylation diminishes in those settings.\",\n      \"method\": \"Immunofluorescence, subcellular fractionation, [32P]-orthophosphate metabolic labeling\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct fractionation and radiolabeling, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"8381120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Desmoyokin, a 680 kDa desmosomal plaque protein, is identical to AHNAK; its distribution in keratinocytes (closely associated with the plasma membrane) differs from non-keratinocyte cells where it is diffusely cytoplasmic, suggesting cell-type-specific localization and function.\",\n      \"method\": \"cDNA immunoscreening, sequence homology, immunofluorescence, Southern blot\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — sequence identity established, immunofluorescence localization, single lab with multiple methods\",\n      \"pmids\": [\"8408266\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"PKC activation (by TPA or high calcium) is required for translocation of desmoyokin/AHNAK from the cytoplasm/nucleus to the plasma membrane in keratinocytes; selective PKC inhibitors completely block this translocation, and calcium-induced phosphorylation of AHNAK was confirmed by [32P] labeling.\",\n      \"method\": \"PKC inhibitor treatment, TPA stimulation, calcium switch, immunofluorescence, [32P]-orthophosphate immunoprecipitation\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological dissection with inhibitors, metabolic labeling, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"7698224\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"In human epidermis, desmoyokin/AHNAK localizes to the non-desmosomal and non-hemidesmosomal plasma membrane of keratinocytes, not to desmosomes themselves, established by post-embedding immunoelectron microscopy with double-labeling against desmosomal markers.\",\n      \"method\": \"Post-embedding immunoelectron microscopy, double immunolabeling with desmosomal markers\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — high-resolution ultrastructural localization, single lab, rigorous double-labeling controls\",\n      \"pmids\": [\"7769263\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"AHNAK binds and activates phospholipase C-gamma1 (PLC-γ1) in the presence of arachidonic acid; arachidonic acid promotes a physical interaction between AHNAK and PLC-γ1, and activation is attributable to reduction of the enzyme's apparent Km toward PIP2. Recombinant AHNAK fragments containing one or four repeated motifs activated PLC-γ1 at nanomolar concentrations, establishing multiple activation sites per molecule.\",\n      \"method\": \"GST fusion protein pulldown, in vitro PLC-γ1 activity assay, recombinant protein purification\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro enzymatic activation assay with recombinant proteins and mutagenesis-level domain dissection, replicated with multiple fragments\",\n      \"pmids\": [\"10318799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"AHNAK (pp700) interacts specifically with the beta2 subunit of cardiac L-type Ca2+ channels as revealed by co-precipitation with anti-channel subunit antibodies; membrane-associated AHNAK undergoes substantial in vivo PKA phosphorylation upon beta-adrenergic stimulation (isoproterenol), specifically in the fraction that co-precipitates with the Ca2+ channel beta subunit.\",\n      \"method\": \"Co-immunoprecipitation, back-phosphorylation assay, immunofluorescence on cardiomyocytes, RT-PCR\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP and in vivo phosphorylation assay, single lab, multiple methods\",\n      \"pmids\": [\"10593863\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The C-terminal domain of desmoyokin/AHNAK is responsible for its nuclear localization in low-calcium conditions and for its calcium/PKC-induced translocation from nucleus toward the cytoplasm and cell membrane; N-terminal and central domains alone showed no calcium-dependent redistribution.\",\n      \"method\": \"Transient transfection of N-terminal, central, and C-terminal domain expression constructs in COS-7, HeLa, and keratinocytes; immunofluorescence in low vs. normal calcium conditions\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-deletion mapping with direct live-cell localization, single lab, multiple cell types\",\n      \"pmids\": [\"10771490\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"AHNAK is the major and most specific Ca2+-dependent target of S100B in fibroblast and astrocytoma cells; interaction requires both Ca2+ and Zn2+ (2 Zn2+ per S100B enhance Ca2+-dependent binding), and the binding domains on AHNAK map to its repeated motifs. AHNAK does not bind calmodulin, S100A6, or S100A11 under these conditions.\",\n      \"method\": \"S100B-Sepharose pulldown, anti-S100B immunoprecipitation, truncated AHNAK fragment binding assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal pulldown and IP, domain mapping with truncations, single lab\",\n      \"pmids\": [\"11312263\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"PKB/Akt phosphorylates AHNAK in vitro and in vivo on serine 5535; this phosphorylation mediates nuclear export of AHNAK via a nuclear export signal (NES) and is a major determinant of AHNAK's extranuclear localization in epithelial cells.\",\n      \"method\": \"In vitro kinase assay, phospho-specific mutagenesis (Ser5535), NES identification, subcellular fractionation, immunofluorescence\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay combined with site-directed mutagenesis of the phosphorylation site and NES, direct localization readout, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"11535620\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The C-terminal region of AHNAK (aa 5262–5643) interacts with the beta2a subunit of the cardiac L-type Ca2+ channel with Kd ~55 nM (for the beta2a C-terminal truncate), and the same region binds G-actin and co-sediments with F-actin, providing a structural link between the L-type Ca2+ channel and the actin-based cytoskeleton.\",\n      \"method\": \"GST pulldown, equilibrium sedimentation/analytical ultracentrifugation (Kd determination), F-actin co-sedimentation, confocal immunofluorescence\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution binding assay with quantitative affinity determination plus independent actin co-sedimentation, single rigorous study with multiple orthogonal methods\",\n      \"pmids\": [\"12153988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"AHNAK forms a multimeric complex with actin and the annexin 2/S100A10 heterotetramer at the cytosolic face of the plasma membrane; the S100A10 subunit mediates the annexin 2–AHNAK interaction at the AHNAK C-terminal domain. siRNA-mediated knockdown of annexin 2/S100A10 prevents AHNAK plasma membrane association, and AHNAK siRNA prevents cortical actin cytoskeleton reorganization required for cell height in MDCK cells.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence in MDCK cells, confocal microscopy\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, siRNA loss-of-function with specific cellular phenotype (cortical actin), independently confirmed in multiple knockdown conditions\",\n      \"pmids\": [\"14699089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Four central repeated units (4 CRUs) of AHNAK act as a scaffolding motif that binds both PKC-α and PLC-γ1; AHNAK-bound PKC-α stimulates arachidonic acid release near PLC-γ1, and the concerted action of 4 CRUs with arachidonic acid activates PLC-γ1, leading to IP3 generation and intracellular Ca2+ mobilization in a PLC-γ1-dependent manner.\",\n      \"method\": \"GST pulldown, siRNA depletion of PLC-γ1, inositol phosphate (IP) measurement, Ca2+ mobilization assay in NIH3T3 cells expressing 4 CRUs\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro binding assay plus functional reconstitution in cells with RNAi validation of the downstream effector, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"15033986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The C-terminal ahnak fragment (ahnak-C2) induces actin filament bundling into paracrystalline-like structures in vitro and stabilizes isometric force development in demembranated skeletal muscle fibers. An endogenous 72 kDa C-terminal ahnak fragment co-purifies with myofibrillar proteins and localizes to intercalated discs and near the Z-line in cardiomyocytes.\",\n      \"method\": \"Recombinant protein/actin bundling assay (electron microscopy), demembranated fiber force measurement, immunocytochemistry/confocal microscopy\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of actin bundling with EM verification plus functional fiber mechanics assay, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"15001564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The carboxyl-terminal ahnak fragments P3 (aa 5456–5556) and P4 (aa 5556–5643) modulate the L-type Ca2+ current in rat ventricular cardiomyocytes: P4 increases current amplitude by ~23% while both P3 and P4 slow current inactivation. These effects are mediated via the ahnak–beta2 subunit interaction rather than the ahnak–F-actin interaction, as actin-stabilizing agents did not alter their effect.\",\n      \"method\": \"Whole-cell patch clamp on rat cardiomyocytes, intracellular perfusion of recombinant ahnak peptides, pharmacological controls (phalloidin, jasplakinolide)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted functional calcium channel regulation with defined peptide fragments and pharmacological dissection of mechanism, rigorous controls\",\n      \"pmids\": [\"14722071\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"AHNAK interacts specifically with the DNA ligase IV–XRCC4 complex (but not with other DNA ligases or other NHEJ components), stimulates the double-stranded ligation activity of DNA ligase IV–XRCC4, has weak DNA-binding activity, and forms a stable complex with DNA ligase IV–XRCC4 on DNA.\",\n      \"method\": \"Immunoaffinity purification, co-immunoprecipitation, in vitro DNA ligation assay, DNA-binding assay\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro ligation assay plus co-IP, single lab\",\n      \"pmids\": [\"15177040\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"A naturally occurring missense variant Ile5236Thr in AHNAK critically reduces beta2 subunit binding affinity (~50% decrease after PKA phosphorylation or with the mutant peptide) and, when applied intracellularly, mimics PKA effects on L-type Ca2+ current (increases amplitude ~60%, slows inactivation, leftward voltage shift) and prevents further up-regulation by isoprenaline.\",\n      \"method\": \"GST pulldown binding with wild-type vs. mutant ahnak fragments, whole-cell patch clamp on native cardiomyocytes with intracellular peptide application\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro binding with mutant vs. wild-type combined with electrophysiological functional readout, multiple complementary methods in one study\",\n      \"pmids\": [\"16319140\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"AHNAK is a component of the dysferlin protein complex in skeletal muscle; the C2A domain of dysferlin binds the C-terminal domain of AHNAK (defined by GST pulldown); reduction or absence of dysferlin causes secondary muscle-specific loss of AHNAK from the sarcolemma; during regeneration, both proteins redistribute to the cytoplasm in concert.\",\n      \"method\": \"Co-immunoprecipitation coupled with mass spectrometry, GST pulldown domain mapping, immunofluorescence on human and rat muscle biopsies\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP/MS identification, domain mapping by GST pulldown, corroborated in human disease tissue and regeneration model\",\n      \"pmids\": [\"17185750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"A specific 20-amino-acid peptide in the AHNAK C-terminal domain (A2tBP1) constitutes the minimal binding motif for the annexin 2/S100A10 tetramer (A2t); binding requires both the annexin 2 N-terminal tail and S100A10 together (neither alone is sufficient); a second, lower-affinity A2t-binding motif (A2tBP2) exists in the N-terminal AHNAK domain. Overexpressed A2tBP1-EGFP co-fractionates with and co-immunoprecipitates S100A10/annexin 2 in a calcium-dependent manner, and relocalizes to the plasma membrane under oxidative/mechanical stress.\",\n      \"method\": \"Yeast triple-hybrid assay, in vitro binding assay, EGFP fusion overexpression/co-IP, live-cell imaging\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — yeast triple-hybrid plus in vitro binding plus cell-based co-IP, multiple orthogonal methods, single rigorous study\",\n      \"pmids\": [\"16984913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"AHNAK1 is required for plasma membrane expression of L-type calcium channel alpha1S (Cav1.1) subunit in CD4+ T cells, likely through interaction with the beta regulatory subunit; AHNAK1-deficient mice exhibit reduced Ca2+ influx upon TCR crosslinking and poor NFAT activation.\",\n      \"method\": \"AHNAK1 knockout mouse model, flow cytometry for Cav1.1 surface expression, Ca2+ flux measurement, NFAT reporter assay\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with multiple mechanistic readouts (channel surface expression, Ca2+ influx, NFAT activation), single lab with orthogonal methods\",\n      \"pmids\": [\"18191595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"AHNAK central repeated units (CRUs) bind and activate PKC-α in a phosphatidylserine/DAG-independent manner and disrupt the PKC-α–protein phosphatase 2A (PP2A) inhibitory complex, thereby potentiating PKC-α activation and downstream Raf/MEK/Erk phosphorylation; Ahnak-null MEFs show enhanced PKC–PP2A complex formation and reduced membrane translocation of PKC-α in response to stimuli.\",\n      \"method\": \"Co-immunoprecipitation, GST pulldown, PKC activity assay, Ahnak knockout MEFs, immunofluorescence for PKC translocation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, knockout MEF rescue experiments, multiple orthogonal assays, replicated with add-back expression\",\n      \"pmids\": [\"18174170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"AHNAK1 is required for Ca2+ entry into mature cytolytic CD8+ T cells (CTLs); AHNAK1-deficient CTLs show markedly reduced Cav1.1 alpha1S subunit expression, reduced granzyme-B production, cytolytic activity, and IFN-γ secretion after TCR stimulation.\",\n      \"method\": \"AHNAK1 knockout mouse model, Ca2+ flux assay, flow cytometry (granzyme-B, IFN-γ), cytolysis assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with multiple specific functional readouts, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"19497879\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The C-type natriuretic peptide receptor (NPR-C) tethers AHNAK1 at the plasma membrane via the AHNAK1 C1 domain; siRNA knockdown of NPR-C results in AHNAK1 nuclear accumulation, and knockdown of either NPR-C or AHNAK1 attenuates arachidonic acid/phorbol ester-induced intracellular Ca2+ mobilization.\",\n      \"method\": \"Co-immunoprecipitation/MS, GST pulldown domain mapping, sucrose density gradient fractionation, siRNA knockdown, Ca2+ mobilization assay\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP/MS plus domain pulldown plus siRNA functional assay, single lab\",\n      \"pmids\": [\"19710363\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In osteoblastic MC3T3-E1 cells, AHNAK associates with the Cav1.2/beta2-subunit complex at the plasma membrane via the beta2 subunit; siRNA knockdown of AHNAK significantly impairs Ca2+ influx without disrupting the actin cytoskeleton or disassembling the Cav1.2/beta2 complex.\",\n      \"method\": \"Co-immunoprecipitation, FRET (fluorescence resonance energy transfer), siRNA knockdown, Ca2+ influx measurement, immunohistochemistry\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FRET plus Co-IP plus siRNA functional Ca2+ assay, single lab\",\n      \"pmids\": [\"19261907\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"AHNAK is constitutively expressed by myelinating Schwann cells; siRNA silencing of AHNAK affects Schwann cell morphology and laminin-substrate attachment, and alters expression and distribution of dystroglycan, suggesting AHNAK targets the dystroglycan-associated receptor complex at the plasma membrane.\",\n      \"method\": \"siRNA knockdown in primary Schwann cells, immunofluorescence, western blot for dystroglycan, morphology assay\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA loss-of-function with defined molecular and morphological readouts, single lab\",\n      \"pmids\": [\"18837049\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"AHNAK1 and AHNAK2 are both components of the costameric network in skeletal muscle (co-localize with vinculin); AHNAK1 is absent from the T-tubule system; AHNAK1-deficient fibers show significantly higher transverse stiffness by atomic force microscopy, but AHNAK1 is not required for membrane repair in a laser wounding assay.\",\n      \"method\": \"Specific antibody immunofluorescence/co-localization, atomic force microscopy, laser wounding assay in AHNAK1-deficient fibers\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with AFM quantitative stiffness measurement and localization, single lab, multiple methods\",\n      \"pmids\": [\"20833135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"AHNAK interaction with dysferlin is lost upon cleavage by calpain 3 protease; in muscular dystrophies (LGMD2B from dysferlin mutations and LGMD2A from calpain 3 mutations), ahnak1 loses sarcolemmal localization and appears in muscle connective tissue. Ca2+-stimulated vesicle shedding from primary human myotubes releases ahnak1-containing vesicles (~150 nm diameter), establishing a vesicle-release mechanism for abnormal ahnak1 localization.\",\n      \"method\": \"Immunofluorescence on human muscle biopsies, vesicle purification, electron microscopy, western blot\",\n      \"journal\": \"Journal of muscle research and cell motility\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — human disease tissue plus vesicle purification and EM, single lab\",\n      \"pmids\": [\"22057634\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"A small 17 kDa AHNAK isoform (generated by alternative splicing) interacts with the large 700 kDa AHNAK in the cytoplasm; the small isoform is also present in the nucleus and establishes a positive feedback loop to regulate mRNA splicing at its own locus during muscle differentiation.\",\n      \"method\": \"RT-PCR, western blot, co-immunoprecipitation of isoforms, transfection experiments during muscle differentiation\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of isoforms plus splicing reporter, single lab with multiple methods\",\n      \"pmids\": [\"21940993\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Crystal structure of a 20-aa AHNAK C-terminal peptide (residues 5654–5673) bound to the annexin A2/S100A10 heterotetramer at 2.5 Å resolution shows that binding is governed by hydrophobic interactions between AHNAK side chains and pockets on S100A10, while hydrogen bonds predominantly involve backbone AHNAK atoms, explaining the binding's specificity for S100A10 over other S100 proteins.\",\n      \"method\": \"X-ray crystallography (2.5 Å resolution)\",\n      \"journal\": \"Acta crystallographica. Section D, Biological crystallography\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — high-resolution crystal structure providing atomic-level mechanistic detail, single lab\",\n      \"pmids\": [\"23275167\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Ahnak1 interacts with the SH3-HOOK-GK core region of Cavβ2 (C- and N-terminal Cavβ2 regions are dispensable); PKA phosphorylation of Ser-296 in the GK domain of Cavβ2 increases ahnak1 binding affinity ~2.4-fold but reduces binding capacity ~60%, constituting a mechanism by which PKA phosphorylation modulates ahnak1's effect on Cav1.2 channel activity.\",\n      \"method\": \"In vitro binding assay with Cavβ2 truncation mutants, mass spectrometry (phosphosite identification), surface plasmon resonance (SPR/Kd), immunocytochemistry\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro domain mapping, MS phosphosite identification, quantitative SPR binding, and phospho-mimic mutagenesis, single lab with multiple orthogonal rigorous methods\",\n      \"pmids\": [\"22497893\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Ahnak functions as a scaffolding protein in aortic smooth muscle cells (ASMCs) connecting a complex of Erk, PAK (p21-activated kinase), and PIXβ (PAK-interacting exchange factor β); Ahnak knockout ASMCs show reduced Rac activation, impaired lamellipodial protrusion, and decreased PDGF-dependent migration; neointimal formation and SMC migration after carotid ligation injury are significantly retarded in Ahnak knockout mice.\",\n      \"method\": \"Co-immunoprecipitation with anti-PAK antibody, Rac activation assay, transwell/wound-healing migration assay, carotid ligation model in Ahnak-/- mice\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP complex identification, genetic knockout with in vitro and in vivo functional phenotypes, multiple orthogonal methods\",\n      \"pmids\": [\"23042471\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Ahnak directly interacts with Smad3 through its MH2 domain and stimulates Smad3 nuclear localization, potentiating TGFβ-induced transcriptional activity; Ahnak overexpression causes c-Myc and cyclin D1/D2 downregulation and cell cycle arrest; Ahnak-null mice in the MMTV-middle T background show significantly accelerated mammary hyperplasia.\",\n      \"method\": \"Co-immunoprecipitation, nuclear fractionation/immunofluorescence, reporter assay, western blot (c-Myc, cyclin D1/D2), MMTV-Tg/Ahnak-/- mouse model\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP of Smad3-Ahnak, nuclear localization assay, transcriptional reporter, genetic mouse model with specific mammary phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"24662814\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Crystal structures of the PDZ-like domain of AHNAK2 reveal intertwined, domain-swapped homodimers; the AHNAK2 PDZ domain contains a bound class III ligand peptide in the preformed binding pocket with two salt bridges and weak C-terminus recognition, providing a structural basis for homodimerization and scaffolding function.\",\n      \"method\": \"X-ray crystallography of PDZ-like domains from PRX and AHNAK2\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure, but AHNAK2 (not AHNAK1) and limited functional validation\",\n      \"pmids\": [\"24675079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"AHNAK directly interacts with SMAD1 and facilitates Smad1 binding to the PPARγ2 promoter, thereby stimulating BMP2-mediated adipocyte differentiation; loss of AHNAK impairs Smad1 phosphorylation and nuclear localization, downregulates PPARγ expression, and severely impairs adipocyte differentiation.\",\n      \"method\": \"Co-immunoprecipitation, chromatin immunoprecipitation (ChIP) on PPARγ promoter, siRNA knockdown, Ahnak-/- adipose-derived stem cells, Oil Red O staining\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP plus ChIP showing direct promoter interaction, knockout stem cells, multiple orthogonal assays, single lab\",\n      \"pmids\": [\"26466345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"AHNAK is the most abundant protein component of extracellular vesicles produced by mammary carcinoma cells and is necessary for their formation; AHNAK-depleted carcinoma cells produce fewer vesicles that are less capable of promoting recipient fibroblast migration.\",\n      \"method\": \"Proteomic analysis (non-biased MS) of vesicle contents, AHNAK knockdown, fibroblast migration assay\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS-based vesicle proteomics and siRNA knockdown with functional migration assay, single lab\",\n      \"pmids\": [\"27374178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"UBE3C ubiquitin E3 ligase ubiquitinates AHNAK and promotes its proteasomal degradation; AHNAK functions as a cofactor assisting p53 binding to stemness-related gene promoters to inhibit transcription; UBE3C-mediated AHNAK degradation removes this p53-mediated inhibition, enhancing cancer stem cell properties.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, ChIP for AHNAK-p53 on promoters, in vivo xenograft\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP ubiquitination assay and ChIP, single lab, multiple methods\",\n      \"pmids\": [\"30503554\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Ahnak induces EMT in response to TGFβ by activating Smad3 phosphorylation and enhancing Smad3 transcriptional activity; stable knockdown of Ahnak in B16F10 cells reduces N-cadherin expression and Smad3 phosphorylation, and abrogates TGFβ-induced migration, invasion, and lung metastasis in C57BL/6 mice.\",\n      \"method\": \"siRNA/shRNA knockdown, western blot (Smad3-phos, N-cadherin, EMT markers), migration/invasion assay, tail-vein lung metastasis model\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — stable knockdown with in vitro and in vivo metastasis assay, single lab\",\n      \"pmids\": [\"30258109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RNF38 RING-finger E3 ubiquitin ligase ubiquitinates and degrades AHNAK, thereby relieving AHNAK-mediated inhibition of TGFβ signaling and promoting HCC cell migration and invasion; re-introduction of AHNAK interference restores invasion capacity diminished by RNF38 downregulation.\",\n      \"method\": \"SILAC proteomics, Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, in vitro/in vivo invasion assays\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — quantitative proteomics plus Co-IP ubiquitination assay plus rescue experiment, single lab\",\n      \"pmids\": [\"30836988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Ahnak scaffolds the p11 (S100A10)/Anxa2 complex and L-type VGCC: through its N-terminal region it interacts with the pore-forming α1 subunit, and through its C-terminal region it interacts with the β subunit and the p11/Anxa2 complex. Ahnak knockout neurons show reduced α1 surface expression and L-type Ca2+ current, and constitutive or forebrain-specific Ahnak KO mice display depression-like behavior similar to p11 KO mice.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping, electrophysiology (L-type Ca2+ current), confocal microscopy, Ahnak conditional/constitutive knockout mice, behavioral testing\",\n      \"journal\": \"Molecular psychiatry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP domain mapping, electrophysiology in KO neurons, cell-type-specific KO mice with behavioral phenotype, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"30760886\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"AHNAK C-terminal peptide (residues 5654–5673) preferentially and strongly binds negatively charged phospholipids with unsaturated acyl chains, established by Langmuir monolayer tensiometry, ellipsometry, and 31P solid-state NMR on lipid bilayers.\",\n      \"method\": \"Langmuir monolayer surface tensiometry, ellipsometry, 31P solid-state NMR\",\n      \"journal\": \"Langmuir\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — biophysical reconstitution with multiple orthogonal methods, single lab, no cellular validation\",\n      \"pmids\": [\"31825630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AHNAK binds to the 53BP1 oligomerization domain and controls 53BP1 multimerization and phase separation; loss of AHNAK results in hyper-accumulation of 53BP1 on chromatin, enhanced phase separation, and elevated p53 response, leading to senescence in non-transformed cells and sensitizing cancer cells.\",\n      \"method\": \"Co-immunoprecipitation (G1 phase enrichment), chromatin fractionation, live-cell imaging of 53BP1 condensates, AHNAK knockout/knockdown, phase separation assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP defining binding domain, chromatin fractionation, phase separation assay, KO with specific p53/senescence phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"33961796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Ahnak regulates tumor metastasis colonization through PCSK9 expression: Ahnak-/- mice show higher resistance to pulmonary B16F10 metastasis; transcriptomic analysis of Ahnak-/- pulmonary endothelial cells reveals PCSK9 downregulation, and lung epithelium-specific PCSK9 conditional KO mice also show suppressed B16F10 pulmonary metastasis.\",\n      \"method\": \"Tail-vein metastasis model in Ahnak-/- mice, transcriptomic analysis of primary endothelial cells, tissue-specific conditional PCSK9 KO mouse model\",\n      \"journal\": \"Neoplasia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO models (two independent lines), transcriptomics, single lab\",\n      \"pmids\": [\"34352405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In mitotic HeLa cells, annexin A2 (Anx2) recruits AHNAK to the cell cortex facing spindle poles; depletion of either protein or impaired cortical AHNAK localization causes delayed anaphase onset and unstable spindle anchoring, resulting in altered spindle orientation; AHNAK is found in a complex with dynein-dynactin, and both AHNAK and Anx2 are required for correct NuMA and dynein cortical localization and dynamics.\",\n      \"method\": \"siRNA depletion, live-cell imaging, co-immunoprecipitation (AHNAK-dynein-dynactin), immunofluorescence (NuMA, dynein cortical localization)\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP of AHNAK-dynein-dynactin complex, siRNA loss-of-function with quantitative spindle orientation and NuMA/dynein localization readouts, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"35362526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"AHNAK1 modulates L-type Ca2+ channel inactivation in cardiomyocytes; in vitro binding studies show that the most C-terminal 188 aa of ahnak1 containing a PxxP motif (188-PSTP) binds Cavβ2 with Kd ~60 nM, while proline-to-alanine substitutions reduce affinity ~20-fold; both 188-PSTP and 188-ASTA affect I(CaL) only in ahnak1-expressing cardiomyocytes and not in ahnak1-deficient cardiomyocytes, demonstrating that endogenous ahnak1 is required.\",\n      \"method\": \"In vitro binding assay, whole-cell patch clamp (rat, WT mouse, ahnak1-/- mouse cardiomyocytes), intracellular peptide perfusion, proline-to-alanine mutagenesis\",\n      \"journal\": \"Pflugers Archiv : European journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro binding with mutagenesis plus electrophysiology in wild-type and knockout cardiomyocytes, multiple orthogonal methods\",\n      \"pmids\": [\"20607281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"AHNAK1 co-localizes with β-dystroglycan in Cajal bands of myelinated Schwann cells; β-dystroglycan co-immunoprecipitates with AHNAK1, shows reduced expression in ahnak1-/- Schwann cells, and is undetectable in Cajal bands of ahnak1-/- sciatic nerve. AHNAK1-deficient Schwann cells show reduced migration velocity on laminin, greater mechanical rigidity of processes, and decreased internodal lengths, suggesting AHNAK1 links dystroglycan to F-actin to regulate Schwann cell morphology and myelination.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence/electron microscopy, scratch wound migration assay, atomic force microscopy, siRNA knockdown in developing sciatic nerve\",\n      \"journal\": \"Glia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP plus EM plus genetic knockout plus AFM plus in vivo siRNA, multiple orthogonal methods confirming the mechanistic link\",\n      \"pmids\": [\"24796807\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"AHNAK is a giant (~700 kDa) scaffolding phosphoprotein whose subcellular localization (nucleus, cytoplasm, or plasma membrane) is regulated by PKB/Akt-mediated phosphorylation of Ser5535 (driving nuclear export) and by PKC activation and Ca2+-dependent cell–cell contacts; at the plasma membrane it forms multimeric complexes with annexin A2/S100A10 (binding defined by a 2.5 Å crystal structure), the dysferlin complex, and β-dystroglycan to organize the cortical actin cytoskeleton; through its C-terminal domain it binds the Cavβ2 subunit of L-type Ca2+ channels (Kd ~35–60 nM), acting as a tonic inhibitory brake on Cav1.2 current that is relieved by PKA phosphorylation of either AHNAK or Cavβ2, thereby coupling β-adrenergic signaling to channel regulation; its central repeated units scaffold PLC-γ1 and PKC-α (disrupting a PKC–PP2A inhibitory complex) to amplify Ca2+ and Erk/Rac signaling; it potentiates TGFβ/Smad3 signaling by promoting Smad3 nuclear accumulation and interacts with SMAD1 on the PPARγ promoter to drive adipogenesis; it restrains 53BP1 oligomerization and phase separation to modulate the p53 DNA-damage response; and it is ubiquitinated and degraded by UBE3C and RNF38 E3 ligases, providing post-translational control of its tumor-suppressive and pro-metastatic activities depending on cellular context.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"AHNAK is a giant (~700 kDa) scaffolding phosphoprotein built from highly conserved central repeated units whose subcellular distribution between nucleus, cytoplasm, and plasma membrane is dynamically controlled by phosphorylation: PKB/Akt phosphorylation of Ser5535 drives nuclear export through an adjacent NES [#9], while PKC activation and Ca2+-dependent signals translocate it toward the cell membrane via determinants in its C-terminal domain [#3, #7]. At the cytosolic face of the plasma membrane AHNAK assembles a cortical actin-organizing platform: its C-terminal domain binds G- and F-actin and the annexin A2/S100A10 (A2t) heterotetramer through a defined 20-residue motif (resolved at 2.5 Å), and these interactions are required for cortical actin reorganization and cell architecture [#10, #11, #18, #28]. Through its central repeated units AHNAK functions as a signaling scaffold, binding and activating PLC-γ1 in an arachidonic-acid-dependent manner and recruiting PKC-α—disrupting the inhibitory PKC-α/PP2A complex—to amplify Ca2+ mobilization and Raf/MEK/Erk and Rac signaling [#5, #12, #20, #30]. A second major role is regulation of L-type voltage-gated Ca2+ channels: AHNAK binds the Cavβ2 subunit (Kd ~55–60 nM via a C-terminal PxxP motif) to act as a brake on Cav1.2 current that is relieved by PKA phosphorylation of either partner, and is required for surface expression and Ca2+ influx of L-type channels in T cells, neurons, and other cell types [#6, #10, #14, #16, #29, #43, #38, #19, #21]. AHNAK is a structural component of muscle membrane complexes including the dysferlin complex and the costamere/β-dystroglycan network, linking these to the actin cytoskeleton and influencing membrane mechanics and Schwann cell morphology [#17, #25, #44]. In the nucleus AHNAK shapes growth and stress responses: it potentiates TGFβ/Smad3 signaling by promoting Smad3 nuclear accumulation and drives BMP2/Smad1-dependent adipogenesis at the PPARγ promoter [#31, #33, #36], and it restrains 53BP1 oligomerization and phase separation to tune the p53 DNA-damage response and senescence [#40]. Its protein levels are controlled by the UBE3C and RNF38 E3 ubiquitin ligases, providing post-translational control over its context-dependent tumor-suppressive and pro-metastatic activities [#35, #37].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Establishing that AHNAK is an exceptionally large protein dominated by conserved 128-aa repeats framed the central question of how a repeat-based giant functions, suggesting a modular scaffold rather than an enzyme.\",\n      \"evidence\": \"cDNA cloning, sequence analysis, and subcellular fractionation\",\n      \"pmids\": [\"1608957\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No molecular function assigned to the repeats at this stage\", \"Localization assignment was preliminary\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Defining AHNAK as a serine/threonine phosphoprotein whose abundance and phosphorylation track cell-cycle exit, and its identity with the desmosomal-plaque protein desmoyokin, connected it to phosphorylation control and cell-type-specific membrane localization.\",\n      \"evidence\": \"Immunofluorescence, fractionation, [32P] labeling, and cDNA immunoscreening across cell types\",\n      \"pmids\": [\"8381120\", \"8408266\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Responsible kinases unidentified\", \"Functional consequence of localization shift unknown\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Demonstrating that PKC activation and Ca2+ are required for AHNAK translocation to the plasma membrane, where it localizes to non-desmosomal membrane, recast it as a signal-responsive membrane-associated protein.\",\n      \"evidence\": \"PKC inhibitor/TPA/calcium-switch experiments and immunoelectron microscopy in keratinocytes\",\n      \"pmids\": [\"7698224\", \"7769263\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct PKC phosphosites not mapped\", \"Membrane tethering partner unknown\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Identifying that AHNAK binds and activates PLC-γ1 in an arachidonic-acid-dependent manner and co-precipitates with the cardiac L-type Ca2+ channel β2 subunit revealed two distinct effector engagements—lipid-signaling enzyme activation and ion-channel regulation.\",\n      \"evidence\": \"GST pulldown with in vitro PLC-γ1 activity assay; co-IP and PKA back-phosphorylation in cardiomyocytes\",\n      \"pmids\": [\"10318799\", \"10593863\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular significance of PLC-γ1 activation not yet shown\", \"Functional effect on channel current not yet measured\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Mapping PKB/Akt phosphorylation of Ser5535 to an NES-dependent nuclear export, and identifying AHNAK as the major Ca2+/Zn2+-dependent S100B target via its repeats, defined the molecular switch governing AHNAK's nucleocytoplasmic distribution and its S100-family specificity.\",\n      \"evidence\": \"In vitro kinase assay with Ser5535 mutagenesis and NES mapping; S100B pulldown/IP with truncation mapping\",\n      \"pmids\": [\"11535620\", \"11312263\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream signals controlling Akt-dependent export not defined\", \"Functional role of S100B binding unresolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Quantifying the C-terminal AHNAK–Cavβ2a interaction (Kd ~55 nM) and showing the same region binds actin established AHNAK as a physical bridge between the L-type Ca2+ channel and the cortical cytoskeleton.\",\n      \"evidence\": \"GST pulldown, analytical ultracentrifugation Kd determination, and F-actin co-sedimentation\",\n      \"pmids\": [\"12153988\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence for channel current not measured here\", \"Stoichiometry within the membrane complex unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Reconstituting four central repeated units as a dual PKC-α/PLC-γ1 scaffold, defining C-terminal actin-bundling and force-stabilizing activity, and showing C-terminal peptides directly modulate cardiac I(CaL) via the β2 subunit, established AHNAK repeats and C-terminus as functional signaling and cytoskeletal modules.\",\n      \"evidence\": \"GST pulldowns, siRNA-validated Ca2+/IP3 assays, in vitro actin bundling with EM and skinned-fiber mechanics, and whole-cell patch clamp with peptide perfusion\",\n      \"pmids\": [\"15033986\", \"15001564\", \"14722071\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo contribution of repeat scaffolding not yet tested by knockout\", \"Link between actin bundling and channel modulation incompletely separated\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Showing AHNAK binds the DNA ligase IV–XRCC4 complex and stimulates its ligation activity introduced a candidate role in non-homologous end joining, expanding AHNAK beyond membrane/cytoskeletal functions.\",\n      \"evidence\": \"Immunoaffinity purification, co-IP, and in vitro DNA ligation/DNA-binding assays\",\n      \"pmids\": [\"15177040\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No cellular NHEJ phenotype demonstrated\", \"Weak DNA binding leaves recruitment mechanism unclear\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defining the minimal C-terminal A2t-binding motif and identifying AHNAK as a dysferlin-complex component established the precise interfaces by which AHNAK is tethered at the plasma membrane and the sarcolemma.\",\n      \"evidence\": \"Yeast triple-hybrid, in vitro binding, EGFP co-IP/imaging; co-IP/MS and GST pulldown in muscle with disease-tissue corroboration\",\n      \"pmids\": [\"16984913\", \"17185750\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional output of dysferlin–AHNAK binding in repair vs. structure unresolved\", \"Regulation of A2t motif engagement in vivo unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Genetic AHNAK1 ablation in T cells and analysis of Ahnak-null MEFs demonstrated that AHNAK is required for L-type channel surface expression and Ca2+ entry/NFAT signaling and potentiates PKC-α/Erk by disrupting the PKC–PP2A complex, moving AHNAK from biochemical scaffold to physiologically required signaling regulator.\",\n      \"evidence\": \"AHNAK1 knockout mice with Cav1.1 surface/Ca2+ flux/NFAT readouts; co-IP, PKC activity, and knockout MEF rescue\",\n      \"pmids\": [\"18191595\", \"18174170\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of channel trafficking by AHNAK not resolved at molecular level\", \"Tissue-specific redundancy with AHNAK2 untested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Extending the AHNAK1 requirement to CD8+ CTL effector function, the NPR-C membrane tether, and osteoblast Cav1.2 Ca2+ influx generalized AHNAK as a Ca2+-entry organizer across multiple cell types.\",\n      \"evidence\": \"AHNAK1 knockout CTL assays; co-IP/MS plus domain mapping for NPR-C; FRET/co-IP/siRNA Ca2+ assays in osteoblasts\",\n      \"pmids\": [\"19497879\", \"19710363\", \"19261907\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether AHNAK acts on trafficking versus gating differs across studies\", \"NPR-C tethering generality untested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Costameric localization and increased transverse stiffness of AHNAK1-deficient fibers, without a membrane-repair defect, refined AHNAK's muscle role toward mechanical/structural support rather than wound resealing.\",\n      \"evidence\": \"Immunolocalization, atomic force microscopy, and laser wounding in AHNAK1-deficient fibers\",\n      \"pmids\": [\"20833135\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of altered stiffness not defined\", \"AHNAK1 vs AHNAK2 functional division unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showing calpain-3 cleavage abolishes the dysferlin–AHNAK interaction and that AHNAK is released in shed vesicles linked AHNAK mislocalization to muscular dystrophy pathology and a vesicle-shedding mechanism, while a 17 kDa isoform was found to autoregulate AHNAK splicing.\",\n      \"evidence\": \"Disease-biopsy immunofluorescence, vesicle purification/EM; isoform co-IP and splicing reporters during myogenesis\",\n      \"pmids\": [\"22057634\", \"21940993\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal role of AHNAK loss in dystrophy phenotype not established\", \"Splicing feedback mechanism not mapped to specific factors\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Atomic-level structure of the AHNAK peptide on annexin A2/S100A10 and SPR-based mapping of the Cavβ2 SH3-HOOK-GK interface with PKA-Ser296 modulation explained both the specificity of membrane tethering and the phosphorylation-tunable channel regulation, while AHNAK's PAK/PIX/Erk scaffolding drove Rac-dependent smooth-muscle migration in vivo.\",\n      \"evidence\": \"2.5 Å crystallography; truncation binding, MS phosphosite ID, SPR; co-IP, Rac assays, and Ahnak-/- carotid injury model\",\n      \"pmids\": [\"23275167\", \"22497893\", \"23042471\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for Cavβ2 modulation lacks a complex structure\", \"How distinct scaffolds are spatially segregated within one molecule unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defining AHNAK1 as required for cardiac I(CaL) modulation via a C-terminal PxxP–Cavβ2 interaction, its β-dystroglycan/F-actin link in Schwann cells, and its Smad3-MH2 interaction promoting TGFβ-driven growth arrest and a mammary tumor-suppressive phenotype, established parallel channel, structural, and nuclear-signaling roles validated genetically.\",\n      \"evidence\": \"Patch clamp in WT/ahnak1-/- cardiomyocytes with mutagenesis; co-IP/EM/AFM/in vivo siRNA in Schwann cells; co-IP, reporter, and MMTV/Ahnak-/- mouse model\",\n      \"pmids\": [\"20607281\", \"24796807\", \"24662814\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How nuclear Smad3 role integrates with membrane functions unresolved\", \"Context-dependence of tumor-suppressive vs pro-tumor outputs unexplained\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showing AHNAK binds SMAD1 and recruits it to the PPARγ promoter to drive BMP2-dependent adipogenesis extended AHNAK's nuclear scaffolding role to a second Smad pathway and a developmental/differentiation program.\",\n      \"evidence\": \"Co-IP, ChIP on PPARγ promoter, siRNA, and Ahnak-/- adipose-derived stem cells\",\n      \"pmids\": [\"26466345\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How AHNAK partitions between Smad1 and Smad3 signaling unclear\", \"Direct DNA versus Smad-mediated promoter engagement not separated\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identifying UBE3C-mediated ubiquitination/degradation of AHNAK (relieving p53-dependent repression of stemness genes) and AHNAK-driven TGFβ/Smad3 EMT and metastasis revealed post-translational control of AHNAK's opposing roles in cancer.\",\n      \"evidence\": \"Co-IP/ubiquitination assays, ChIP, xenografts; shRNA knockdown with EMT markers and lung-metastasis model\",\n      \"pmids\": [\"30503554\", \"30258109\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reconciling tumor-suppressive p53/Smad3 roles with pro-metastatic activity by context\", \"Direct ubiquitination sites not mapped\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showing RNF38 degrades AHNAK to relieve its inhibition of TGFβ signaling, that AHNAK scaffolds the p11/Anxa2 complex with L-type VGCC in neurons to control mood-relevant Ca2+ signaling, and biophysical lipid-binding of its C-terminal peptide further unified its ubiquitin-controlled scaffolding across cancer, neuronal, and membrane contexts.\",\n      \"evidence\": \"SILAC/co-IP/ubiquitination/rescue in HCC; co-IP domain mapping, electrophysiology, and Ahnak KO mice with behavioral testing; Langmuir/ellipsometry/31P-NMR lipid assays\",\n      \"pmids\": [\"30836988\", \"30760886\", \"31825630\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Lipid binding lacks cellular validation\", \"Whether neuronal and cardiac channel mechanisms are identical untested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrating that AHNAK binds the 53BP1 oligomerization domain to restrain its multimerization, phase separation, and p53/senescence output, and that AHNAK promotes metastatic colonization through endothelial PCSK9, connected AHNAK directly to DNA-damage-response condensate control and to the tumor microenvironment.\",\n      \"evidence\": \"Co-IP, chromatin fractionation, live-cell condensate imaging, AHNAK KO; metastasis models with transcriptomics and conditional PCSK9 KO mice\",\n      \"pmids\": [\"33961796\", \"34352405\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How AHNAK partitions between cytoplasmic scaffold and nuclear 53BP1 regulator unresolved\", \"Mechanism linking AHNAK to PCSK9 transcription unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showing annexin A2 recruits AHNAK to spindle-pole-facing cortex where, in complex with dynein-dynactin, it is required for NuMA/dynein cortical localization and proper spindle orientation extended AHNAK's cortical actin-organizing role to mitotic spindle positioning.\",\n      \"evidence\": \"siRNA depletion, live-cell imaging, AHNAK-dynein-dynactin co-IP, and NuMA/dynein cortical immunofluorescence in HeLa cells\",\n      \"pmids\": [\"35362526\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether AHNAK contacts dynein-dynactin directly is unresolved\", \"Link to cell-cycle-dependent AHNAK phosphorylation not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how a single giant scaffold integrates and switches between its membrane-cytoskeletal, ion-channel, nuclear Smad/53BP1, and ubiquitin-controlled functions to produce its context-dependent tumor-suppressive versus pro-metastatic outcomes.\",\n      \"evidence\": \"Synthesis across the timeline; no single study resolves the integrating logic\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No full-length structure to relate distinct domains spatially\", \"Quantitative phosphorylation map coupling localization to specific functions is missing\", \"Determinants of opposing cancer phenotypes across tissues undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [11, 12, 20, 30, 38]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [10, 13]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 12, 14, 16, 29, 43, 40]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [39]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [40]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 4, 11, 18, 38]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 9, 31, 33, 40]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 7]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [10, 11, 13]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [26, 34]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [12, 20, 30, 31, 33]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [19, 21]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [15, 40]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [35, 36, 37, 41]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [42]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [33, 44]}\n    ],\n    \"complexes\": [\n      \"annexin A2/S100A10 (A2t) heterotetramer complex\",\n      \"dysferlin complex\",\n      \"L-type Ca2+ channel (Cav1.2/Cavβ2) complex\",\n      \"costamere / β-dystroglycan network\"\n    ],\n    \"partners\": [\n      \"ANXA2\",\n      \"S100A10\",\n      \"CACNB2\",\n      \"PLCG1\",\n      \"PRKCA\",\n      \"SMAD3\",\n      \"TP53BP1\",\n      \"DYSF\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":7,"faith_total":7,"faith_pct":100.0}}