{"gene":"AAK1","run_date":"2026-06-09T22:02:35","timeline":{"discoveries":[{"year":2002,"finding":"AAK1 is a serine/threonine kinase of the Prk/Ark family that directly binds the ear domain of alpha-adaptin of the AP2 complex in vivo and in vitro, copurifies with AP2, colocalizes with clathrin and AP2 in clathrin-coated pits, and specifically phosphorylates the mu2 (AP2M1) subunit in vitro, resulting in decreased AP2-stimulated transferrin internalization.","method":"Co-purification, in vivo and in vitro binding assays, in vitro kinase assay, stage-specific endocytosis assays, immunofluorescence colocalization","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (co-purification, binding assays, in vitro kinase assay, functional endocytosis assay) in a single rigorous study establishing AAK1 as the endogenous mu2 kinase","pmids":["11877461"],"is_preprint":false},{"year":2002,"finding":"AAK1 phosphorylates mu2 (AP2M1) at a single threonine residue (Thr-156), and this phosphorylation enhances the binding affinity of AP2 for tyrosine-based sorting motifs up to 25-fold compared to dephosphorylated AP2, thereby promoting cargo recognition during receptor-mediated endocytosis.","method":"In vitro phosphorylation assays, site-specific mutagenesis (Thr-156), affinity binding assays measuring AP2-sorting signal interaction","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay with site-specific mutagenesis identifying the phosphorylation site, quantitative binding assays, replicated by independent lab in same journal issue","pmids":["11877457"],"is_preprint":false},{"year":2003,"finding":"Assembled clathrin stimulates AAK1-mediated mu2 phosphorylation; clathrin cages provide greater stimulation than unassembled clathrin triskelia. Efficient stimulation involves multiple interactions between several AAK1 domains and both heavy and light chains of clathrin, indicating clathrin plays a regulatory (not merely structural) role by activating AAK1 within coated pits.","method":"In vitro kinase assays with assembled clathrin cages vs. triskelia, domain-mapping binding assays","journal":"Traffic (Copenhagen, Denmark)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with multiple clathrin forms and domain-mapping, single lab but multiple orthogonal approaches","pmids":["14617351"],"is_preprint":false},{"year":2007,"finding":"A long splice variant of AAK1 (AAK1L) contains an additional C-terminal clathrin-binding domain (CBD2) with multiple low-affinity interaction motifs that directly binds clathrin. Overexpression of CBD2 impairs transferrin endocytosis. Additionally, AAK1 depletion by RNAi or CBD2 overexpression impairs transferrin recycling from early/sorting endosomes, indicating AAK1 functions at multiple steps of the endosomal pathway.","method":"Protein interaction studies (pulldown), in vitro kinase assays, RNAi knockdown, transferrin recycling assays, overexpression studies","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding assays plus functional knockdown with defined readouts, single lab","pmids":["17494869"],"is_preprint":false},{"year":2008,"finding":"AAK1 binds to and phosphorylates Numb at Thr-102. AAK1 overexpression redistributes Numb to perinuclear endosomes, while AAK1 depletion causes Numb accumulation at the plasma membrane. A phosphorylation-null Numb mutant (T102A) disrupts transferrin and LDL internalization but not EGF uptake, and accumulates at the plasma membrane with elevated colocalization with coated pit markers.","method":"Co-immunoprecipitation, in vitro kinase assay, site-directed mutagenesis (T102A), RNAi knockdown, internalization assays, immunofluorescence colocalization","journal":"Traffic (Copenhagen, Denmark)","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro kinase assay with mutagenesis, functional endocytosis assays, and colocalization in single study with multiple orthogonal methods","pmids":["18657069"],"is_preprint":false},{"year":2011,"finding":"AAK1 directly interacts with the membrane-tethered active form of Notch (released by metalloprotease cleavage). Active AAK1 stabilizes both the membrane-tethered activated Notch and its monoubiquitinated form upstream of gamma-secretase cleavage. AAK1 acts as an adaptor for Notch interaction with CME components such as Eps15b. AAK1 overexpression increases localization of activated Notch to Rab5-positive endocytic vesicles; AAK1 depletion interferes with this localization.","method":"Co-immunoprecipitation, overexpression and depletion studies, immunofluorescence colocalization with Rab5-positive vesicles, Notch signaling reporter assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — direct binding demonstrated by Co-IP, functional effects with overexpression/depletion, localization experiments, single lab","pmids":["21464124"],"is_preprint":false},{"year":2011,"finding":"AAK1 is identified as a relevant target of the natural product K252a; loss of AAK1 (via RNAi) alters ErbB4 receptor trafficking and expression levels, revealing a previously unrecognized role for AAK1 in Nrg1/ErbB4-mediated neurotrophic factor signaling.","method":"Chemical genomics (differentially active analogs + SILAC-based affinity enrichment proteomics), RNAi knockdown, ErbB4 trafficking and expression assays","journal":"Chemistry & biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — chemical proteomics target identification plus RNAi functional validation with receptor trafficking readout, single lab","pmids":["21802010"],"is_preprint":false},{"year":2012,"finding":"NDR1/2 kinases phosphorylate AAK1 in the brain as identified by chemical genetics (analog-sensitive kinase alleles with thiophosphate labeling). AAK1 functions downstream of NDR1/2 and contributes to dendrite growth regulation in mammalian pyramidal neurons.","method":"Chemical genetics (analog-sensitive NDR1/2 kinase alleles, thiophosphate labeling, mass spectrometry substrate identification), dominant-negative and constitutively active NDR1/2 mutants, siRNA knockdown, in vivo and in vitro neuronal morphology assays","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1 / Moderate — rigorous chemical-genetic substrate identification by mass spectrometry plus in vivo functional validation with multiple genetic tools","pmids":["22445341"],"is_preprint":false},{"year":2014,"finding":"AAK1 selectively interacts with mutant (but not wild-type) SOD1 in ALS models, as identified by yeast two-hybrid. In transgenic SOD1-ALS rodent models, AAK1 is mislocated from normal endosomal/presynaptic compartments into aggregates containing mutant SOD1 and neurofilament proteins, and AAK1 protein levels are decreased in ALS patients.","method":"Yeast two-hybrid, immunofluorescence colocalization in transgenic ALS mouse and rat models, protein level quantification","journal":"International journal of molecular sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — yeast two-hybrid plus colocalization studies, no biochemical reconstitution, single lab","pmids":["25514244"],"is_preprint":false},{"year":2016,"finding":"AAK1 knockout mice have normal responses in acute pain assays but markedly reduced responses to persistent pain (phase II formalin) and fail to develop tactile allodynia after spinal nerve ligation. AAK1 inhibitors act in the spinal cord (demonstrated by non-brain-penetrant inhibitor and local spinal administration) and their antinociceptive mechanism requires alpha-2 adrenergic receptor signaling (blocked by alpha-2 receptor antagonists but not opioid receptor antagonists).","method":"Genetic knockout, pharmacological inhibition with selective inhibitors, non-brain-penetrant inhibitor studies, local administration, behavioral pain assays (formalin, SNL, CCI, diabetic neuropathy), in vivo spinal cord electrophysiology","journal":"The Journal of pharmacology and experimental therapeutics","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout plus pharmacological inhibition with multiple pain models, pathway placement via receptor antagonist epistasis, replicated across multiple models and routes","pmids":["27411717"],"is_preprint":false},{"year":2019,"finding":"AAK1 promotes clathrin-mediated endocytosis of LRP6 to suppress WNT/beta-catenin signaling. WNT treatment drives AAK1-dependent phosphorylation of AP2M1, clathrin-coated pit maturation, and endocytosis of LRP6 in a transcription-uncoupled negative feedback loop. Reciprocally, AAK1 genetic silencing or pharmacological inhibition activates WNT signaling.","method":"Gain-of-function kinome screen, genetic silencing (siRNA), pharmacological inhibition, time-course WNT treatment assays, AP2M1 phosphorylation assays, LRP6 plasma membrane localization and internalization assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — kinome screen, orthogonal genetic and pharmacological inhibition, mechanistic time-course and phosphorylation assays in single rigorous study","pmids":["30605688"],"is_preprint":false},{"year":2022,"finding":"AAK1 positively regulates NF-κB signaling by controlling the stability of the inhibitory protein IκBα; miR-671-5p directly targets AAK1 mRNA for post-transcriptional degradation, reducing AAK1 activity and thereby dampening NF-κB-dependent pulmonary inflammatory injury.","method":"miRNA target validation, protein stability assays for IκBα, NF-κB reporter/signaling assays, AAK1 overexpression/knockdown in cell and mouse LPS-injury models","journal":"Molecular therapy : the journal of the American Society of Gene Therapy","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — direct miRNA-target validation plus mechanistic IκBα stability assays and in vivo models, single lab","pmids":["36733250"],"is_preprint":false},{"year":2023,"finding":"AAK1 promotes LPS internalization required for caspase-11 activation (non-canonical inflammasome/pyroptosis pathway) in macrophages. PHZ-OH targets AAK1 and prevents AAK1-mediated LPS internalization for caspase-11 activation. In vivo, AAK1 inhibitor-treated mice are protected similarly to Casp11-/- and Msr1-/- mice, but not to Casp1/11-/- or Nlrp3-/- mice.","method":"Chemical screening, physical and physiological target engagement studies, gene-modified mice (Casp11-/-, Casp1-/-, Casp1/11-/-, Msr1-/-, Nlrp3-/-), in vivo sepsis models, LPS internalization assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with multiple knockout lines plus pharmacological target engagement, single lab","pmids":["35982051"],"is_preprint":false},{"year":2023,"finding":"AAK1 binding to Notch promotes the differentiation of neural stem cells (NSCs) into neurons rather than astrocytes in the context of ischemic brain injury; miR-124 delivered via M2 microglia extracellular vesicles suppresses AAK1 expression to modulate this pathway.","method":"Proteomic analysis of NSC samples, miR-124 knockdown in extracellular vesicles, in vivo MCAO mouse model, NSC differentiation assays","journal":"Stroke","confidence":"Low","confidence_rationale":"Tier 3 / Weak — proteomics identification of AAK1 as responding protein plus functional in vivo model, but direct AAK1-Notch interaction not biochemically validated in this study","pmids":["37586072"],"is_preprint":false},{"year":2024,"finding":"AAK1 promotes SARS-CoV-2 endocytosis by phosphorylating AP2M1 at Thr-156, which facilitates the direct interaction between AP2M1 and ACE2 for clathrin-mediated endocytosis of the virus; AAK1 inhibition disrupts this interaction and blocks viral entry.","method":"AAK1 inhibitor treatment, AP2M1 phosphorylation assays (Thr-156), co-immunoprecipitation of AP2M1 and ACE2, SARS-CoV-2 pseudovirus infection assays in hACE2-HEK293 cells","journal":"European journal of medicinal chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phosphorylation site assay plus co-IP of AP2M1–ACE2 interaction plus functional antiviral assay, single lab","pmids":["38377825"],"is_preprint":false},{"year":2024,"finding":"In C. elegans, SEL-5 (the AAK1 orthologue) acts together with the retromer complex as a positive regulator of EGL-20/Wnt signaling during QL neuroblast daughter cell migration and excretory canal cell outgrowth. Importantly, SEL-5 kinase activity is not required for these roles, and neither process depends on DPY-23/AP2M1 phosphorylation, revealing a kinase-independent function.","method":"Genetic epistasis (double mutants with retromer complex), kinase-dead mutant analysis, cell migration and outgrowth assays in C. elegans, Wnt pathway reporter assays","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with multiple mutant combinations and kinase-dead alleles establishing kinase-independent function, single lab","pmids":["39028260"],"is_preprint":false},{"year":2025,"finding":"PKCβII phosphorylates and activates AAK1 during ferroptosis, forming a PKCβII–AAK1–AP2M1 pathway. Activated AAK1 phosphorylates AP2M1, which facilitates clathrin recruitment to mediate transferrin receptor 1 (TFR1) endocytosis, increasing cellular total iron and ferrous iron to promote ferroptosis. A non-phosphorylatable AAK1 mutation inhibits ferroptosis and promotes breast tumor growth in vivo.","method":"Kinase identification assays, phosphorylation assays, Co-IP, clathrin recruitment assays, TFR1 endocytosis assays, iron measurement, ferroptosis assays, phospho-mimetic/phospho-null AAK1 mutants, in vivo tumor xenograft models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — identification of upstream kinase (PKCβII), mechanistic phosphorylation pathway, mutant analysis, and in vivo functional validation with multiple orthogonal methods","pmids":["41407700"],"is_preprint":false},{"year":2026,"finding":"AAK1 directly phosphorylates PDLIM5 and Talin1 (identified via motif-guided in silico, biochemical, and phosphoproteomic screens). AAK1 is recruited to focal adhesions and its activity peaks at the onset of focal adhesion disassembly. The conserved AAK1 C-terminal PDZ-binding motif mediates direct low-affinity binding to PDLIM5. Phospho-mimetic and phospho-null mutant analyses support that AAK1-dependent phosphorylation promotes timely release of PDLIM5 and Talin1 during focal adhesion disassembly to accelerate cell migration.","method":"Phosphoproteomic screen, biochemical kinase assays, live-cell imaging (focal adhesion dynamics), pulldown/binding assays (PDZ-binding motif), phospho-mimetic and phospho-null mutant analysis, cell migration assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — phosphoproteomic substrate identification combined with biochemical validation, direct binding assays, live-cell imaging, and phospho-mutant functional analysis in single rigorous study","pmids":["42082516"],"is_preprint":false},{"year":2025,"finding":"BIN1 (isoform 1) and AAK1 are proximal/interacting proteins in mouse brain neurons, identified by TurboID-based proximity labeling and validated by immunostaining and proximity ligation assays.","method":"TurboID proximity labeling, label-free quantitative proteomics, immunostaining, proximity ligation assay","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — proximity labeling and PLA without biochemical reconstitution, preprint, single lab","pmids":["bio_10.1101_2025.03.09.642169"],"is_preprint":true}],"current_model":"AAK1 is a Prk/Ark-family serine/threonine kinase that constitutively associates with the AP2 clathrin adaptor complex (via the alpha-adaptin ear domain) and phosphorylates AP2M1 (mu2) at Thr-156, a modification that is stimulated by assembled clathrin cages and enhances AP2 affinity for cargo sorting signals up to 25-fold to drive clathrin-mediated endocytosis; upstream, AAK1 itself is activated by PKCβII-mediated phosphorylation during ferroptosis and by NDR1/2 kinases in neurons; downstream, AAK1 activity regulates diverse cargoes including transferrin receptor, LRP6 (creating a WNT negative feedback loop), ErbB4, TFR1 (iron uptake/ferroptosis), and Notch; AAK1 also phosphorylates the endocytic accessory protein Numb (Thr-102) and, in a CME-independent manner, phosphorylates focal adhesion proteins PDLIM5 and Talin1 to promote focal adhesion disassembly and cell migration."},"narrative":{"mechanistic_narrative":"AAK1 is a Prk/Ark-family serine/threonine kinase that couples the assembly of clathrin coats to cargo selection during clathrin-mediated endocytosis [PMID:11877461]. It constitutively associates with the AP2 adaptor complex through the alpha-adaptin ear domain and phosphorylates the AP2 mu2 subunit (AP2M1) at Thr-156, a modification that increases AP2 affinity for tyrosine-based sorting signals up to 25-fold to drive cargo recognition [PMID:11877461, PMID:11877457]; assembled clathrin cages stimulate this kinase activity, so AAK1 reads coat assembly as the trigger for cargo capture [PMID:14617351]. Through this activity AAK1 controls the internalization and trafficking of multiple receptors, including the transferrin receptor [PMID:11877461, PMID:17494869], LRP6—where AP2M1-dependent endocytosis forms a transcription-uncoupled negative feedback loop on WNT/beta-catenin signaling [PMID:30605688]—ErbB4 [PMID:21802010], Notch [PMID:21464124], and transferrin receptor 1, whose endocytosis raises cellular iron to promote ferroptosis [PMID:41407700]. AAK1 additionally phosphorylates the endocytic accessory protein Numb at Thr-102 to govern its membrane distribution and cargo-selective internalization [PMID:18657069]. AAK1 activity is set by upstream kinases: NDR1/2 phosphorylate AAK1 in neurons to regulate dendrite growth [PMID:22445341], and PKCβII activates AAK1 during ferroptosis [PMID:41407700]. Beyond endocytosis, AAK1 directly phosphorylates the focal adhesion proteins PDLIM5 and Talin1, is recruited to focal adhesions via a C-terminal PDZ-binding motif, and promotes their timely release during adhesion disassembly to accelerate cell migration [PMID:42082516]. AAK1 has been genetically and pharmacologically implicated in persistent pain through a spinal, alpha-2 adrenergic-dependent mechanism [PMID:27411717], in NF-κB-driven inflammatory injury [PMID:36733250], and in caspase-11 non-canonical inflammasome activation via LPS internalization [PMID:35982051].","teleology":[{"year":2002,"claim":"Established AAK1 as the physiological AP2 mu2 kinase and linked it directly to clathrin-coated pit function, defining its core molecular role in endocytosis.","evidence":"Co-purification with AP2, in vivo/in vitro binding to alpha-adaptin ear, in vitro kinase assay on mu2, and transferrin internalization assays","pmids":["11877461","11877457"],"confidence":"High","gaps":["Did not resolve how clathrin assembly couples to kinase activation","Structural basis of AAK1-AP2 association not defined"]},{"year":2002,"claim":"Mapped the functional consequence of mu2 phosphorylation, showing Thr-156 phosphorylation increases AP2 affinity for sorting signals up to 25-fold, mechanistically connecting AAK1 activity to cargo recognition.","evidence":"In vitro phosphorylation with Thr-156 site mutagenesis and quantitative AP2-sorting signal binding assays","pmids":["11877457"],"confidence":"High","gaps":["In vitro affinity gain not directly tied to cargo loading rates in cells","Reversal/phosphatase that turns the signal off not identified"]},{"year":2003,"claim":"Showed that assembled clathrin, not just adaptor binding, activates AAK1, establishing clathrin as a regulatory activator coupling coat assembly to cargo selection.","evidence":"In vitro kinase assays comparing clathrin cages vs triskelia plus AAK1 domain mapping to clathrin heavy and light chains","pmids":["14617351"],"confidence":"High","gaps":["Conformational mechanism of activation unresolved","Quantitative thresholds in vivo unknown"]},{"year":2007,"claim":"Extended AAK1 function beyond uptake to endosomal recycling and identified a long splice variant with a second clathrin-binding domain, indicating action at multiple trafficking steps.","evidence":"Pulldown binding assays, RNAi knockdown, transferrin recycling and CBD2 overexpression assays","pmids":["17494869"],"confidence":"Medium","gaps":["Kinase-dependence of recycling role not separated","Single-lab functional readouts"]},{"year":2008,"claim":"Identified Numb as a non-AP2 AAK1 substrate (Thr-102), broadening the kinase's regulation of endocytic accessory machinery in a cargo-selective manner.","evidence":"Co-IP, in vitro kinase assay, T102A mutant, RNAi, and cargo-specific internalization assays","pmids":["18657069"],"confidence":"High","gaps":["How Numb phosphorylation selects transferrin/LDL over EGF cargo not mechanistically resolved"]},{"year":2011,"claim":"Connected AAK1 to receptor signaling outputs by showing it regulates Notch trafficking and ErbB4 levels, implicating endocytic control in developmental and neurotrophic signaling.","evidence":"Co-IP, overexpression/depletion, Rab5 colocalization and Notch reporter assays; chemical proteomics plus RNAi for ErbB4","pmids":["21464124","21802010"],"confidence":"Medium","gaps":["Direct phosphorylation of Notch or ErbB4 by AAK1 not demonstrated","Kinase-dependence of adaptor role for Notch unclear"]},{"year":2012,"claim":"Placed AAK1 downstream of NDR1/2 kinases in neurons, establishing an upstream regulatory input and a role in dendrite growth.","evidence":"Analog-sensitive NDR1/2 chemical genetics with thiophosphate labeling and mass spectrometry, plus neuronal morphology assays","pmids":["22445341"],"confidence":"High","gaps":["AAK1 phosphosite(s) by NDR1/2 not mapped","Functional link between phosphorylation and endocytic activity not defined"]},{"year":2016,"claim":"Demonstrated an in vivo physiological role in persistent pain, localizing AAK1 action to the spinal cord and placing it upstream of alpha-2 adrenergic signaling.","evidence":"Knockout mice, selective and non-brain-penetrant inhibitors, behavioral pain models, receptor antagonist epistasis, spinal electrophysiology","pmids":["27411717"],"confidence":"High","gaps":["Molecular substrate underlying the antinociceptive effect not identified","Connection to endocytic mechanism unresolved"]},{"year":2019,"claim":"Defined a transcription-uncoupled WNT negative feedback loop in which AAK1 drives AP2M1-dependent LRP6 endocytosis, linking the core endocytic mechanism to a signaling output.","evidence":"Kinome screen, siRNA and inhibitor, WNT time-course, AP2M1 phosphorylation, and LRP6 internalization assays","pmids":["30605688"],"confidence":"High","gaps":["How WNT signaling activates AAK1 not defined","Direct LRP6-AP2 cargo selection step not biochemically isolated"]},{"year":2022,"claim":"Implicated AAK1 in NF-κB-driven inflammation through control of IκBα stability and identified miR-671-5p as a post-transcriptional regulator.","evidence":"miRNA target validation, IκBα stability assays, NF-κB reporters, and LPS-injury mouse models","pmids":["36733250"],"confidence":"Medium","gaps":["Mechanistic link between AAK1 kinase activity and IκBα stability unclear","Direct substrate not identified"]},{"year":2023,"claim":"Showed AAK1 promotes LPS internalization required for caspase-11 non-canonical inflammasome activation, extending its endocytic role to innate immune sensing.","evidence":"Chemical target engagement and genetic epistasis across multiple knockout lines (Casp11, Casp1, Msr1, Nlrp3) in sepsis models","pmids":["35982051"],"confidence":"Medium","gaps":["Specific endocytic cargo/route for LPS uptake not fully defined","Role of AAK1 catalytic activity not isolated"]},{"year":2024,"claim":"Demonstrated AAK1 drives viral entry by phosphorylating AP2M1 at Thr-156 to enable ACE2-AP2M1 coupling, reusing the canonical cargo-selection mechanism for SARS-CoV-2 endocytosis.","evidence":"AAK1 inhibitor treatment, Thr-156 phosphorylation assays, AP2M1-ACE2 Co-IP, pseudovirus infection assays","pmids":["38377825"],"confidence":"Medium","gaps":["Whether ACE2 is a direct AP2 sorting cargo not structurally resolved","Single-lab antiviral validation"]},{"year":2024,"claim":"Revealed a kinase-independent function via the C. elegans orthologue SEL-5, which acts with retromer to positively regulate Wnt signaling without requiring AP2M1 phosphorylation, distinguishing catalytic from scaffolding roles.","evidence":"Genetic epistasis with retromer mutants, kinase-dead alleles, and migration/outgrowth assays in C. elegans","pmids":["39028260"],"confidence":"Medium","gaps":["Mammalian relevance of the kinase-independent retromer role untested","Molecular basis of the SEL-5/retromer cooperation unknown"]},{"year":2025,"claim":"Identified PKCβII as an upstream activating kinase that wires AAK1 into a PKCβII-AAK1-AP2M1 pathway driving TFR1 endocytosis, iron uptake, and ferroptosis with tumor-suppressive consequences.","evidence":"Kinase identification and phosphorylation assays, Co-IP, TFR1 endocytosis and iron measurements, phospho-mutant analysis, and tumor xenograft models","pmids":["41407700"],"confidence":"High","gaps":["AAK1 activating phosphosite(s) targeted by PKCβII not detailed here","Generality across ferroptosis contexts unknown"]},{"year":2026,"claim":"Established a CME-independent role at focal adhesions, where AAK1 directly phosphorylates PDLIM5 and Talin1 to time adhesion disassembly and accelerate migration.","evidence":"Phosphoproteomic and motif-guided substrate identification, biochemical kinase assays, PDZ-binding-motif pulldowns, live-cell focal adhesion imaging, and phospho-mutant migration assays","pmids":["42082516"],"confidence":"High","gaps":["Upstream signal recruiting AAK1 to adhesions not identified","Relationship between adhesion and endocytic pools of AAK1 unresolved"]},{"year":null,"claim":"How AAK1 is selectively partitioned between its endocytic cargo-selection role and its CME-independent functions (focal adhesions, kinase-independent retromer signaling), and what governs context-specific upstream activation, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking the multiple upstream activators to distinct downstream substrate pools","Structural basis of substrate and clathrin recognition not solved","Direct mammalian validation of kinase-independent functions lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,4,16,17]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,1,16,17]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[5]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,4]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0,5]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[3,5]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[17]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,1,10,14,16]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[10,11]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[11,12]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[12,16]}],"complexes":[],"partners":["AP2M1","AP2A1","CLTC","NUMB","NOTCH1","LRP6","PDLIM5","TLN1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q2M2I8","full_name":"AP2-associated protein kinase 1","aliases":["Adaptor-associated kinase 1"],"length_aa":961,"mass_kda":103.9,"function":"Regulates clathrin-mediated endocytosis by phosphorylating the AP2M1/mu2 subunit of the adaptor protein complex 2 (AP-2) which ensures high affinity binding of AP-2 to cargo membrane proteins during the initial stages of endocytosis (PubMed:11877457, PubMed:11877461, PubMed:12952931, PubMed:14617351, PubMed:17494869, PubMed:25653444). Isoform 1 and isoform 2 display similar levels of kinase activity towards AP2M1 (PubMed:17494869). Preferentially, may phosphorylate substrates on threonine residues (PubMed:11877457, PubMed:18657069). Regulates phosphorylation of other AP-2 subunits as well as AP-2 localization and AP-2-mediated internalization of ligand complexes (PubMed:12952931). Phosphorylates NUMB and regulates its cellular localization, promoting NUMB localization to endosomes (PubMed:18657069). Binds to and stabilizes the activated form of NOTCH1, increases its localization in endosomes and regulates its transcriptional activity (PubMed:21464124) (Microbial infection) By regulating clathrin-mediated endocytosis, AAK1 plays a role in the entry of hepatitis C virus as well as for the lifecycle of other viruses such as Ebola and Dengue","subcellular_location":"Cell membrane; Membrane, clathrin-coated pit; Presynapse","url":"https://www.uniprot.org/uniprotkb/Q2M2I8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/AAK1","classification":"Not Classified","n_dependent_lines":26,"n_total_lines":1208,"dependency_fraction":0.02152317880794702},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"RALBP1","stoichiometry":10.0},{"gene":"AP2B1","stoichiometry":0.2},{"gene":"AP2S1","stoichiometry":0.2},{"gene":"NECAP2","stoichiometry":0.2},{"gene":"RBM12","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/AAK1","total_profiled":1310},"omim":[{"mim_id":"616405","title":"ADAPTOR PROTEIN 2-ASSOCIATED KINASE 1; AAK1","url":"https://www.omim.org/entry/616405"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"},{"location":"Vesicles","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"parathyroid gland","ntpm":83.6}],"url":"https://www.proteinatlas.org/search/AAK1"},"hgnc":{"alias_symbol":["KIAA1048","DKFZp686K16132"],"prev_symbol":[]},"alphafold":{"accession":"Q2M2I8","domains":[{"cath_id":"3.30.200.20","chopping":"34-129","consensus_level":"medium","plddt":93.7778,"start":34,"end":129},{"cath_id":"1.10.510.10","chopping":"130-342_957-961","consensus_level":"medium","plddt":95.9546,"start":130,"end":961}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q2M2I8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q2M2I8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q2M2I8-F1-predicted_aligned_error_v6.png","plddt_mean":58.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=AAK1","jax_strain_url":"https://www.jax.org/strain/search?query=AAK1"},"sequence":{"accession":"Q2M2I8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q2M2I8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q2M2I8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q2M2I8"}},"corpus_meta":[{"pmid":"11877461","id":"PMC_11877461","title":"Identification 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AP2-stimulated transferrin internalization.\",\n      \"method\": \"Co-purification, in vivo and in vitro binding assays, in vitro kinase assay, stage-specific endocytosis assays, immunofluorescence colocalization\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (co-purification, binding assays, in vitro kinase assay, functional endocytosis assay) in a single rigorous study establishing AAK1 as the endogenous mu2 kinase\",\n      \"pmids\": [\"11877461\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"AAK1 phosphorylates mu2 (AP2M1) at a single threonine residue (Thr-156), and this phosphorylation enhances the binding affinity of AP2 for tyrosine-based sorting motifs up to 25-fold compared to dephosphorylated AP2, thereby promoting cargo recognition during receptor-mediated endocytosis.\",\n      \"method\": \"In vitro phosphorylation assays, site-specific mutagenesis (Thr-156), affinity binding assays measuring AP2-sorting signal interaction\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay with site-specific mutagenesis identifying the phosphorylation site, quantitative binding assays, replicated by independent lab in same journal issue\",\n      \"pmids\": [\"11877457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Assembled clathrin stimulates AAK1-mediated mu2 phosphorylation; clathrin cages provide greater stimulation than unassembled clathrin triskelia. Efficient stimulation involves multiple interactions between several AAK1 domains and both heavy and light chains of clathrin, indicating clathrin plays a regulatory (not merely structural) role by activating AAK1 within coated pits.\",\n      \"method\": \"In vitro kinase assays with assembled clathrin cages vs. triskelia, domain-mapping binding assays\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with multiple clathrin forms and domain-mapping, single lab but multiple orthogonal approaches\",\n      \"pmids\": [\"14617351\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"A long splice variant of AAK1 (AAK1L) contains an additional C-terminal clathrin-binding domain (CBD2) with multiple low-affinity interaction motifs that directly binds clathrin. Overexpression of CBD2 impairs transferrin endocytosis. Additionally, AAK1 depletion by RNAi or CBD2 overexpression impairs transferrin recycling from early/sorting endosomes, indicating AAK1 functions at multiple steps of the endosomal pathway.\",\n      \"method\": \"Protein interaction studies (pulldown), in vitro kinase assays, RNAi knockdown, transferrin recycling assays, overexpression studies\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding assays plus functional knockdown with defined readouts, single lab\",\n      \"pmids\": [\"17494869\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"AAK1 binds to and phosphorylates Numb at Thr-102. AAK1 overexpression redistributes Numb to perinuclear endosomes, while AAK1 depletion causes Numb accumulation at the plasma membrane. A phosphorylation-null Numb mutant (T102A) disrupts transferrin and LDL internalization but not EGF uptake, and accumulates at the plasma membrane with elevated colocalization with coated pit markers.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, site-directed mutagenesis (T102A), RNAi knockdown, internalization assays, immunofluorescence colocalization\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro kinase assay with mutagenesis, functional endocytosis assays, and colocalization in single study with multiple orthogonal methods\",\n      \"pmids\": [\"18657069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"AAK1 directly interacts with the membrane-tethered active form of Notch (released by metalloprotease cleavage). Active AAK1 stabilizes both the membrane-tethered activated Notch and its monoubiquitinated form upstream of gamma-secretase cleavage. AAK1 acts as an adaptor for Notch interaction with CME components such as Eps15b. AAK1 overexpression increases localization of activated Notch to Rab5-positive endocytic vesicles; AAK1 depletion interferes with this localization.\",\n      \"method\": \"Co-immunoprecipitation, overexpression and depletion studies, immunofluorescence colocalization with Rab5-positive vesicles, Notch signaling reporter assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — direct binding demonstrated by Co-IP, functional effects with overexpression/depletion, localization experiments, single lab\",\n      \"pmids\": [\"21464124\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"AAK1 is identified as a relevant target of the natural product K252a; loss of AAK1 (via RNAi) alters ErbB4 receptor trafficking and expression levels, revealing a previously unrecognized role for AAK1 in Nrg1/ErbB4-mediated neurotrophic factor signaling.\",\n      \"method\": \"Chemical genomics (differentially active analogs + SILAC-based affinity enrichment proteomics), RNAi knockdown, ErbB4 trafficking and expression assays\",\n      \"journal\": \"Chemistry & biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — chemical proteomics target identification plus RNAi functional validation with receptor trafficking readout, single lab\",\n      \"pmids\": [\"21802010\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NDR1/2 kinases phosphorylate AAK1 in the brain as identified by chemical genetics (analog-sensitive kinase alleles with thiophosphate labeling). AAK1 functions downstream of NDR1/2 and contributes to dendrite growth regulation in mammalian pyramidal neurons.\",\n      \"method\": \"Chemical genetics (analog-sensitive NDR1/2 kinase alleles, thiophosphate labeling, mass spectrometry substrate identification), dominant-negative and constitutively active NDR1/2 mutants, siRNA knockdown, in vivo and in vitro neuronal morphology assays\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — rigorous chemical-genetic substrate identification by mass spectrometry plus in vivo functional validation with multiple genetic tools\",\n      \"pmids\": [\"22445341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"AAK1 selectively interacts with mutant (but not wild-type) SOD1 in ALS models, as identified by yeast two-hybrid. In transgenic SOD1-ALS rodent models, AAK1 is mislocated from normal endosomal/presynaptic compartments into aggregates containing mutant SOD1 and neurofilament proteins, and AAK1 protein levels are decreased in ALS patients.\",\n      \"method\": \"Yeast two-hybrid, immunofluorescence colocalization in transgenic ALS mouse and rat models, protein level quantification\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — yeast two-hybrid plus colocalization studies, no biochemical reconstitution, single lab\",\n      \"pmids\": [\"25514244\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"AAK1 knockout mice have normal responses in acute pain assays but markedly reduced responses to persistent pain (phase II formalin) and fail to develop tactile allodynia after spinal nerve ligation. AAK1 inhibitors act in the spinal cord (demonstrated by non-brain-penetrant inhibitor and local spinal administration) and their antinociceptive mechanism requires alpha-2 adrenergic receptor signaling (blocked by alpha-2 receptor antagonists but not opioid receptor antagonists).\",\n      \"method\": \"Genetic knockout, pharmacological inhibition with selective inhibitors, non-brain-penetrant inhibitor studies, local administration, behavioral pain assays (formalin, SNL, CCI, diabetic neuropathy), in vivo spinal cord electrophysiology\",\n      \"journal\": \"The Journal of pharmacology and experimental therapeutics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout plus pharmacological inhibition with multiple pain models, pathway placement via receptor antagonist epistasis, replicated across multiple models and routes\",\n      \"pmids\": [\"27411717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"AAK1 promotes clathrin-mediated endocytosis of LRP6 to suppress WNT/beta-catenin signaling. WNT treatment drives AAK1-dependent phosphorylation of AP2M1, clathrin-coated pit maturation, and endocytosis of LRP6 in a transcription-uncoupled negative feedback loop. Reciprocally, AAK1 genetic silencing or pharmacological inhibition activates WNT signaling.\",\n      \"method\": \"Gain-of-function kinome screen, genetic silencing (siRNA), pharmacological inhibition, time-course WNT treatment assays, AP2M1 phosphorylation assays, LRP6 plasma membrane localization and internalization assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — kinome screen, orthogonal genetic and pharmacological inhibition, mechanistic time-course and phosphorylation assays in single rigorous study\",\n      \"pmids\": [\"30605688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"AAK1 positively regulates NF-κB signaling by controlling the stability of the inhibitory protein IκBα; miR-671-5p directly targets AAK1 mRNA for post-transcriptional degradation, reducing AAK1 activity and thereby dampening NF-κB-dependent pulmonary inflammatory injury.\",\n      \"method\": \"miRNA target validation, protein stability assays for IκBα, NF-κB reporter/signaling assays, AAK1 overexpression/knockdown in cell and mouse LPS-injury models\",\n      \"journal\": \"Molecular therapy : the journal of the American Society of Gene Therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — direct miRNA-target validation plus mechanistic IκBα stability assays and in vivo models, single lab\",\n      \"pmids\": [\"36733250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"AAK1 promotes LPS internalization required for caspase-11 activation (non-canonical inflammasome/pyroptosis pathway) in macrophages. PHZ-OH targets AAK1 and prevents AAK1-mediated LPS internalization for caspase-11 activation. In vivo, AAK1 inhibitor-treated mice are protected similarly to Casp11-/- and Msr1-/- mice, but not to Casp1/11-/- or Nlrp3-/- mice.\",\n      \"method\": \"Chemical screening, physical and physiological target engagement studies, gene-modified mice (Casp11-/-, Casp1-/-, Casp1/11-/-, Msr1-/-, Nlrp3-/-), in vivo sepsis models, LPS internalization assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with multiple knockout lines plus pharmacological target engagement, single lab\",\n      \"pmids\": [\"35982051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"AAK1 binding to Notch promotes the differentiation of neural stem cells (NSCs) into neurons rather than astrocytes in the context of ischemic brain injury; miR-124 delivered via M2 microglia extracellular vesicles suppresses AAK1 expression to modulate this pathway.\",\n      \"method\": \"Proteomic analysis of NSC samples, miR-124 knockdown in extracellular vesicles, in vivo MCAO mouse model, NSC differentiation assays\",\n      \"journal\": \"Stroke\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — proteomics identification of AAK1 as responding protein plus functional in vivo model, but direct AAK1-Notch interaction not biochemically validated in this study\",\n      \"pmids\": [\"37586072\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"AAK1 promotes SARS-CoV-2 endocytosis by phosphorylating AP2M1 at Thr-156, which facilitates the direct interaction between AP2M1 and ACE2 for clathrin-mediated endocytosis of the virus; AAK1 inhibition disrupts this interaction and blocks viral entry.\",\n      \"method\": \"AAK1 inhibitor treatment, AP2M1 phosphorylation assays (Thr-156), co-immunoprecipitation of AP2M1 and ACE2, SARS-CoV-2 pseudovirus infection assays in hACE2-HEK293 cells\",\n      \"journal\": \"European journal of medicinal chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphorylation site assay plus co-IP of AP2M1–ACE2 interaction plus functional antiviral assay, single lab\",\n      \"pmids\": [\"38377825\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In C. elegans, SEL-5 (the AAK1 orthologue) acts together with the retromer complex as a positive regulator of EGL-20/Wnt signaling during QL neuroblast daughter cell migration and excretory canal cell outgrowth. Importantly, SEL-5 kinase activity is not required for these roles, and neither process depends on DPY-23/AP2M1 phosphorylation, revealing a kinase-independent function.\",\n      \"method\": \"Genetic epistasis (double mutants with retromer complex), kinase-dead mutant analysis, cell migration and outgrowth assays in C. elegans, Wnt pathway reporter assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with multiple mutant combinations and kinase-dead alleles establishing kinase-independent function, single lab\",\n      \"pmids\": [\"39028260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PKCβII phosphorylates and activates AAK1 during ferroptosis, forming a PKCβII–AAK1–AP2M1 pathway. Activated AAK1 phosphorylates AP2M1, which facilitates clathrin recruitment to mediate transferrin receptor 1 (TFR1) endocytosis, increasing cellular total iron and ferrous iron to promote ferroptosis. A non-phosphorylatable AAK1 mutation inhibits ferroptosis and promotes breast tumor growth in vivo.\",\n      \"method\": \"Kinase identification assays, phosphorylation assays, Co-IP, clathrin recruitment assays, TFR1 endocytosis assays, iron measurement, ferroptosis assays, phospho-mimetic/phospho-null AAK1 mutants, in vivo tumor xenograft models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — identification of upstream kinase (PKCβII), mechanistic phosphorylation pathway, mutant analysis, and in vivo functional validation with multiple orthogonal methods\",\n      \"pmids\": [\"41407700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"AAK1 directly phosphorylates PDLIM5 and Talin1 (identified via motif-guided in silico, biochemical, and phosphoproteomic screens). AAK1 is recruited to focal adhesions and its activity peaks at the onset of focal adhesion disassembly. The conserved AAK1 C-terminal PDZ-binding motif mediates direct low-affinity binding to PDLIM5. Phospho-mimetic and phospho-null mutant analyses support that AAK1-dependent phosphorylation promotes timely release of PDLIM5 and Talin1 during focal adhesion disassembly to accelerate cell migration.\",\n      \"method\": \"Phosphoproteomic screen, biochemical kinase assays, live-cell imaging (focal adhesion dynamics), pulldown/binding assays (PDZ-binding motif), phospho-mimetic and phospho-null mutant analysis, cell migration assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — phosphoproteomic substrate identification combined with biochemical validation, direct binding assays, live-cell imaging, and phospho-mutant functional analysis in single rigorous study\",\n      \"pmids\": [\"42082516\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"BIN1 (isoform 1) and AAK1 are proximal/interacting proteins in mouse brain neurons, identified by TurboID-based proximity labeling and validated by immunostaining and proximity ligation assays.\",\n      \"method\": \"TurboID proximity labeling, label-free quantitative proteomics, immunostaining, proximity ligation assay\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — proximity labeling and PLA without biochemical reconstitution, preprint, single lab\",\n      \"pmids\": [\"bio_10.1101_2025.03.09.642169\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"AAK1 is a Prk/Ark-family serine/threonine kinase that constitutively associates with the AP2 clathrin adaptor complex (via the alpha-adaptin ear domain) and phosphorylates AP2M1 (mu2) at Thr-156, a modification that is stimulated by assembled clathrin cages and enhances AP2 affinity for cargo sorting signals up to 25-fold to drive clathrin-mediated endocytosis; upstream, AAK1 itself is activated by PKCβII-mediated phosphorylation during ferroptosis and by NDR1/2 kinases in neurons; downstream, AAK1 activity regulates diverse cargoes including transferrin receptor, LRP6 (creating a WNT negative feedback loop), ErbB4, TFR1 (iron uptake/ferroptosis), and Notch; AAK1 also phosphorylates the endocytic accessory protein Numb (Thr-102) and, in a CME-independent manner, phosphorylates focal adhesion proteins PDLIM5 and Talin1 to promote focal adhesion disassembly and cell migration.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"AAK1 is a Prk/Ark-family serine/threonine kinase that couples the assembly of clathrin coats to cargo selection during clathrin-mediated endocytosis [#0]. It constitutively associates with the AP2 adaptor complex through the alpha-adaptin ear domain and phosphorylates the AP2 mu2 subunit (AP2M1) at Thr-156, a modification that increases AP2 affinity for tyrosine-based sorting signals up to 25-fold to drive cargo recognition [#0, #1]; assembled clathrin cages stimulate this kinase activity, so AAK1 reads coat assembly as the trigger for cargo capture [#2]. Through this activity AAK1 controls the internalization and trafficking of multiple receptors, including the transferrin receptor [#0, #3], LRP6—where AP2M1-dependent endocytosis forms a transcription-uncoupled negative feedback loop on WNT/beta-catenin signaling [#10]—ErbB4 [#6], Notch [#5], and transferrin receptor 1, whose endocytosis raises cellular iron to promote ferroptosis [#16]. AAK1 additionally phosphorylates the endocytic accessory protein Numb at Thr-102 to govern its membrane distribution and cargo-selective internalization [#4]. AAK1 activity is set by upstream kinases: NDR1/2 phosphorylate AAK1 in neurons to regulate dendrite growth [#7], and PKCβII activates AAK1 during ferroptosis [#16]. Beyond endocytosis, AAK1 directly phosphorylates the focal adhesion proteins PDLIM5 and Talin1, is recruited to focal adhesions via a C-terminal PDZ-binding motif, and promotes their timely release during adhesion disassembly to accelerate cell migration [#17]. AAK1 has been genetically and pharmacologically implicated in persistent pain through a spinal, alpha-2 adrenergic-dependent mechanism [#9], in NF-κB-driven inflammatory injury [#11], and in caspase-11 non-canonical inflammasome activation via LPS internalization [#12].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established AAK1 as the physiological AP2 mu2 kinase and linked it directly to clathrin-coated pit function, defining its core molecular role in endocytosis.\",\n      \"evidence\": \"Co-purification with AP2, in vivo/in vitro binding to alpha-adaptin ear, in vitro kinase assay on mu2, and transferrin internalization assays\",\n      \"pmids\": [\"11877461\", \"11877457\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve how clathrin assembly couples to kinase activation\", \"Structural basis of AAK1-AP2 association not defined\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Mapped the functional consequence of mu2 phosphorylation, showing Thr-156 phosphorylation increases AP2 affinity for sorting signals up to 25-fold, mechanistically connecting AAK1 activity to cargo recognition.\",\n      \"evidence\": \"In vitro phosphorylation with Thr-156 site mutagenesis and quantitative AP2-sorting signal binding assays\",\n      \"pmids\": [\"11877457\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vitro affinity gain not directly tied to cargo loading rates in cells\", \"Reversal/phosphatase that turns the signal off not identified\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Showed that assembled clathrin, not just adaptor binding, activates AAK1, establishing clathrin as a regulatory activator coupling coat assembly to cargo selection.\",\n      \"evidence\": \"In vitro kinase assays comparing clathrin cages vs triskelia plus AAK1 domain mapping to clathrin heavy and light chains\",\n      \"pmids\": [\"14617351\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conformational mechanism of activation unresolved\", \"Quantitative thresholds in vivo unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Extended AAK1 function beyond uptake to endosomal recycling and identified a long splice variant with a second clathrin-binding domain, indicating action at multiple trafficking steps.\",\n      \"evidence\": \"Pulldown binding assays, RNAi knockdown, transferrin recycling and CBD2 overexpression assays\",\n      \"pmids\": [\"17494869\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Kinase-dependence of recycling role not separated\", \"Single-lab functional readouts\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identified Numb as a non-AP2 AAK1 substrate (Thr-102), broadening the kinase's regulation of endocytic accessory machinery in a cargo-selective manner.\",\n      \"evidence\": \"Co-IP, in vitro kinase assay, T102A mutant, RNAi, and cargo-specific internalization assays\",\n      \"pmids\": [\"18657069\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Numb phosphorylation selects transferrin/LDL over EGF cargo not mechanistically resolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Connected AAK1 to receptor signaling outputs by showing it regulates Notch trafficking and ErbB4 levels, implicating endocytic control in developmental and neurotrophic signaling.\",\n      \"evidence\": \"Co-IP, overexpression/depletion, Rab5 colocalization and Notch reporter assays; chemical proteomics plus RNAi for ErbB4\",\n      \"pmids\": [\"21464124\", \"21802010\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct phosphorylation of Notch or ErbB4 by AAK1 not demonstrated\", \"Kinase-dependence of adaptor role for Notch unclear\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Placed AAK1 downstream of NDR1/2 kinases in neurons, establishing an upstream regulatory input and a role in dendrite growth.\",\n      \"evidence\": \"Analog-sensitive NDR1/2 chemical genetics with thiophosphate labeling and mass spectrometry, plus neuronal morphology assays\",\n      \"pmids\": [\"22445341\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"AAK1 phosphosite(s) by NDR1/2 not mapped\", \"Functional link between phosphorylation and endocytic activity not defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrated an in vivo physiological role in persistent pain, localizing AAK1 action to the spinal cord and placing it upstream of alpha-2 adrenergic signaling.\",\n      \"evidence\": \"Knockout mice, selective and non-brain-penetrant inhibitors, behavioral pain models, receptor antagonist epistasis, spinal electrophysiology\",\n      \"pmids\": [\"27411717\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular substrate underlying the antinociceptive effect not identified\", \"Connection to endocytic mechanism unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined a transcription-uncoupled WNT negative feedback loop in which AAK1 drives AP2M1-dependent LRP6 endocytosis, linking the core endocytic mechanism to a signaling output.\",\n      \"evidence\": \"Kinome screen, siRNA and inhibitor, WNT time-course, AP2M1 phosphorylation, and LRP6 internalization assays\",\n      \"pmids\": [\"30605688\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How WNT signaling activates AAK1 not defined\", \"Direct LRP6-AP2 cargo selection step not biochemically isolated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Implicated AAK1 in NF-κB-driven inflammation through control of IκBα stability and identified miR-671-5p as a post-transcriptional regulator.\",\n      \"evidence\": \"miRNA target validation, IκBα stability assays, NF-κB reporters, and LPS-injury mouse models\",\n      \"pmids\": [\"36733250\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link between AAK1 kinase activity and IκBα stability unclear\", \"Direct substrate not identified\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showed AAK1 promotes LPS internalization required for caspase-11 non-canonical inflammasome activation, extending its endocytic role to innate immune sensing.\",\n      \"evidence\": \"Chemical target engagement and genetic epistasis across multiple knockout lines (Casp11, Casp1, Msr1, Nlrp3) in sepsis models\",\n      \"pmids\": [\"35982051\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific endocytic cargo/route for LPS uptake not fully defined\", \"Role of AAK1 catalytic activity not isolated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated AAK1 drives viral entry by phosphorylating AP2M1 at Thr-156 to enable ACE2-AP2M1 coupling, reusing the canonical cargo-selection mechanism for SARS-CoV-2 endocytosis.\",\n      \"evidence\": \"AAK1 inhibitor treatment, Thr-156 phosphorylation assays, AP2M1-ACE2 Co-IP, pseudovirus infection assays\",\n      \"pmids\": [\"38377825\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ACE2 is a direct AP2 sorting cargo not structurally resolved\", \"Single-lab antiviral validation\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed a kinase-independent function via the C. elegans orthologue SEL-5, which acts with retromer to positively regulate Wnt signaling without requiring AP2M1 phosphorylation, distinguishing catalytic from scaffolding roles.\",\n      \"evidence\": \"Genetic epistasis with retromer mutants, kinase-dead alleles, and migration/outgrowth assays in C. elegans\",\n      \"pmids\": [\"39028260\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mammalian relevance of the kinase-independent retromer role untested\", \"Molecular basis of the SEL-5/retromer cooperation unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified PKCβII as an upstream activating kinase that wires AAK1 into a PKCβII-AAK1-AP2M1 pathway driving TFR1 endocytosis, iron uptake, and ferroptosis with tumor-suppressive consequences.\",\n      \"evidence\": \"Kinase identification and phosphorylation assays, Co-IP, TFR1 endocytosis and iron measurements, phospho-mutant analysis, and tumor xenograft models\",\n      \"pmids\": [\"41407700\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"AAK1 activating phosphosite(s) targeted by PKCβII not detailed here\", \"Generality across ferroptosis contexts unknown\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Established a CME-independent role at focal adhesions, where AAK1 directly phosphorylates PDLIM5 and Talin1 to time adhesion disassembly and accelerate migration.\",\n      \"evidence\": \"Phosphoproteomic and motif-guided substrate identification, biochemical kinase assays, PDZ-binding-motif pulldowns, live-cell focal adhesion imaging, and phospho-mutant migration assays\",\n      \"pmids\": [\"42082516\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream signal recruiting AAK1 to adhesions not identified\", \"Relationship between adhesion and endocytic pools of AAK1 unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How AAK1 is selectively partitioned between its endocytic cargo-selection role and its CME-independent functions (focal adhesions, kinase-independent retromer signaling), and what governs context-specific upstream activation, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking the multiple upstream activators to distinct downstream substrate pools\", \"Structural basis of substrate and clathrin recognition not solved\", \"Direct mammalian validation of kinase-independent functions lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 4, 16, 17]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 1, 16, 17]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8856828\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 1, 10, 14, 16]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [10, 11]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [11, 12]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [12, 16]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"AP2M1\", \"AP2A1\", \"CLTC\", \"NUMB\", \"NOTCH1\", \"LRP6\", \"PDLIM5\", \"TLN1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}