{"gene":"MICAL1","run_date":"2026-04-28T18:30:28","timeline":{"discoveries":[{"year":2005,"finding":"Crystal structure of the FAD-containing monooxygenase (MO) domain of mouse MICAL-1 (residues 1-489) at 1.45 Å resolution reveals topology closely resembling NADPH-dependent flavoenzyme p-hydroxybenzoate hydroxylase (PHBH); the flavin ring switches between two discrete positions coupled with opening of a channel to the active site, suggestive of a protein substrate.","method":"X-ray crystallography (1.45 Å), NADPH reaction comparison","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — high-resolution crystal structure with functional mechanistic implication, two independent structural papers published simultaneously","pmids":["16275925"],"is_preprint":false},{"year":2005,"finding":"The N-terminal FAD-containing domain of MICAL is a flavoenzyme that in the presence of NADPH reduces molecular oxygen to H2O2 (Km,NADPH = 222 μM; kcat = 77 s−1), suggesting H2O2 as a signaling molecule in axon guidance.","method":"Biochemical in vitro enzyme assay, X-ray crystallography (2.0 Å)","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — crystal structure plus in vitro enzymatic reconstitution with kinetic parameters","pmids":["16275926"],"is_preprint":false},{"year":2010,"finding":"MICAL directly binds F-actin and disassembles both individual and bundled actin filaments using its redox (monooxygenase) activity; MICAL is necessary and sufficient for semaphorin-plexin-mediated F-actin reorganization in vivo.","method":"Purified protein in vitro F-actin disassembly assay, genetic loss-of-function and gain-of-function in Drosophila, NADPH-dependent redox activity requirement","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 — reconstituted in vitro with purified proteins plus genetic epistasis in vivo, highly cited foundational paper","pmids":["20148037"],"is_preprint":false},{"year":2011,"finding":"Mical directly and stereospecifically oxidizes methionine 44 (Met44) in the D-loop of actin, simultaneously severing filaments and decreasing polymerization; actin is a specific substrate of the Mical monooxygenase.","method":"In vitro biochemical assay with purified Mical and actin, site-specific modification analysis, polymerization assays","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with identification of specific oxidized residue, replicated by multiple labs","pmids":["22116028"],"is_preprint":false},{"year":2013,"finding":"SelR (MsrB methionine sulfoxide reductase) specifically reduces Mical-oxidized actin (actin Met-44-R-sulfoxide) back to methionine, restoring normal polymerization properties and reversing Mical-mediated F-actin disassembly and Semaphorin-Plexin repulsion in vivo.","method":"Genetic screen (Drosophila), in vitro enzyme assay with purified SelR and Mical-oxidized actin, polymerization assays","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro enzymatic reconstitution plus genetic epistasis, reveals reversibility of actin oxidation","pmids":["24212093"],"is_preprint":false},{"year":2008,"finding":"MICAL enzymatic activity is autoinhibited by its own C-terminal domain; CRMP and Plexin associate with non-enzymatic and enzymatic domains of MICAL respectively, and together release this autoinhibition; Semaphorin signaling promotes the CRMP-MICAL physical association.","method":"Co-immunoprecipitation, domain-deletion biochemical assays, enzyme activity measurements","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP plus enzymatic activity assays demonstrating autoinhibition mechanism with multiple orthogonal approaches","pmids":["18305261"],"is_preprint":false},{"year":2016,"finding":"Mical-mediated oxidation of actin Met44 (and Met47) improves cofilin binding to filaments; combined Mical oxidation and cofilin dramatically accelerates F-actin disassembly (synergism) compared to either effector alone, and this synergism is necessary and sufficient for F-actin disassembly in vivo.","method":"In vitro F-actin disassembly assays with purified proteins, TIRF microscopy, genetic experiments in Drosophila","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro biochemical reconstitution plus genetic epistasis, multiple orthogonal methods","pmids":["27454820"],"is_preprint":false},{"year":2017,"finding":"Mical oxidizes actin's M44 and M47 residues; cryo-EM (3.9 Å) reveals that oxidation reorients M44 side chain and induces a new M47-O-T351 intermolecular interaction promoting Mox-actin instability; Mox-actin undergoes catastrophically fast disassembly (84 subunits/s) that is nucleotide-state dependent; Mical oxidation allows cofilin severing even in presence of inorganic phosphate.","method":"Near-atomic cryo-EM (3.9 Å), single-filament TIRF microscopy, site-directed mutagenesis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structure plus mutagenesis plus single-molecule assays in one study","pmids":["29259197"],"is_preprint":false},{"year":2020,"finding":"MICAL1 oxidizes Met308 in the calmodulin-binding domain of CaMKII stereospecifically; oxidized or mutant M308V CaMKII shows decreased CaM binding and CaMKII activity; absence of MICAL1 in mice causes cardiac arrhythmias and premature death due to CaMKII hyperactivation; MSRB reverses this oxidation.","method":"Mouse knockout, in vitro biochemical assays, cell-based functional assays, human iPSC-derived cardiomyocytes, Drosophila genetics","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 1-2 — multiple model organisms, KO mice with defined phenotype, in vitro biochemical validation of the oxidation mechanism","pmids":["32749237"],"is_preprint":false},{"year":2021,"finding":"MICAL1-mediated oxidation of actin filaments suppresses their protection from cofilin severing: oxidation increases cofilin binding and severing rates by orders of magnitude, allows phosphomimetic S3D-cofilin (normally inactive) to sever oxidized filaments, and abolishes tropomyosin Tpm1.8 protection of filaments.","method":"Single-filament in vitro assays with purified proteins, fluorescence microscopy","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1 — rigorous single-molecule reconstitution with multiple orthogonal mechanistic tests","pmids":["33393173"],"is_preprint":false},{"year":2024,"finding":"Cryo-EM structure of full-length human MICAL1 at 3.1 Å shows autoinhibition is mediated by intramolecular interaction between N-terminal catalytic domain and C-terminal coiled-coil domain that blocks F-actin interaction; allosteric changes in the coiled-coil and binding of CH-L2α1-LIM domains to the coiled-coil are required for activation/autoinhibition.","method":"Cryo-EM (3.1 Å nominal resolution), biochemical and functional validation","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 — full-length cryo-EM structure plus biochemical functional validation","pmids":["39532862"],"is_preprint":false},{"year":2018,"finding":"Active GTP-bound Rab8 binds full-length MICAL1 (apparent Kd ~8 μM, 1:1 complex) and stabilizes its active conformation, causing a specific 4-fold increase in kcat of the NADPH oxidase reaction; the region preceding the C-terminal Rab-binding domain masks one Rab-binding site in the autoinhibited state.","method":"Enzyme kinetics, small-angle X-ray scattering (SAXS), binding assays","journal":"Protein science","confidence":"High","confidence_rationale":"Tier 1 — in vitro kinetic reconstitution plus SAXS structural modeling with defined Kd","pmids":["30242933"],"is_preprint":false},{"year":2011,"finding":"MICAL-1 interacts with the hydrophobic motif of NDR1/2 kinases; overexpression or knockdown of MICAL-1 reduces or augments NDR kinase activation respectively; MICAL-1 competes with MST1 for NDR binding and thereby antagonizes MST1-induced NDR kinase activation and NDR-dependent proapoptotic signaling.","method":"Proteomics/mass spectrometry, co-immunoprecipitation, kinase activity assays, siRNA knockdown, overexpression","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — MS-identified interaction confirmed by co-IP, enzymatic activity measurements, and loss/gain of function with defined phenotype","pmids":["21730291"],"is_preprint":false},{"year":2002,"finding":"MICAL (human MICAL1) associates with CasL through its PPKPP proline-rich sequence and with vimentin intermediate filaments through its C-terminal region; MICAL colocalizes with vimentin intermediate filaments as a cytoplasmic protein.","method":"Far Western screening, co-immunoprecipitation, domain-deletion mapping, immunostaining","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 — reciprocal co-IP with domain mapping, single lab","pmids":["11827972"],"is_preprint":false},{"year":2003,"finding":"MICAL-1 isoforms interact with Rab1 GTPase in a nucleotide-dependent manner (active GTP-bound form); the Rab1-interacting domain maps to the C-terminus of MICAL-1, which also mediates vimentin binding; MICAL-1 is predominantly cytosolic.","method":"Yeast two-hybrid, GST pulldown, cell fractionation","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 — yeast two-hybrid confirmed by GST pulldown, single lab, limited functional follow-up","pmids":["12788069"],"is_preprint":false},{"year":2009,"finding":"Mical (Drosophila ortholog) mediates dendrite severing during pruning downstream of Sox14 transcription factor; Sox14 directly regulates mical expression, and overexpression of Mical significantly rescues pruning defects in sox14 mutants, establishing a Sox14-Mical pathway for dendrite severing.","method":"Drosophila genetics (mutant analysis, epistasis, rescue experiments)","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with rescue experiment defining pathway position, replicated with multiple genetic tools","pmids":["19881505"],"is_preprint":false},{"year":2014,"finding":"Vertebrate MICAL-1 regulates targeting of secretory vesicles containing IgCAM cell adhesion molecules to the neuronal growth cone membrane via its ability to control the actin cytoskeleton using redox chemistry, thereby maintaining appropriate IgCAM cell surface levels essential for mossy fibre axon lamina-specific targeting in vivo.","method":"Mouse in vivo loss-of-function, live cell imaging, biochemical fractionation","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — in vivo KO with defined cellular and axon targeting phenotype, multiple methods","pmids":["25007825"],"is_preprint":false},{"year":2016,"finding":"MICAL1 is autoinhibited by its C-terminal coiled-coil region in non-neural cells; MICAL2 is constitutively active; both MICAL1 and MICAL2 regulate actin stress fibers through ROS generation.","method":"Overexpression and knockdown of truncation mutants in HeLa cells, actin staining, ROS measurement","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 3 — cell-based domain analysis with phenotypic readout, single lab","pmids":["22331357"],"is_preprint":false},{"year":2016,"finding":"MICAL1 NADPH oxidase and F-actin depolymerizing activity is regulated by C-terminal, LIM, and CH domains: the C-terminus causes ~10-fold decrease of kcat (autoinhibition) and ~10-fold increase in Km for actin; F-actin lowers Km,NADPH and increases kcat for all MICAL forms.","method":"In vitro biochemical characterization of truncated/full-length MICAL1 forms, kinetic measurements","journal":"Archives of biochemistry and biophysics","confidence":"High","confidence_rationale":"Tier 1 — rigorous in vitro enzymology with multiple truncation constructs and kinetic parameters","pmids":["26845023"],"is_preprint":false},{"year":2022,"finding":"The CDC42 GTPase effector PAK1 physically associates with and phosphorylates MICAL1 on two serine residues at the N-terminal catalytic monooxygenase and calponin homology domains, leading to accelerated F-actin disassembly; extracellular ligand stimulation leads to PAK-dependent MICAL1 phosphorylation.","method":"Co-immunoprecipitation, mass spectrometry, phosphorylation assays, F-actin disassembly assays, domain-mapping","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — co-IP confirmed binding, MS identified phosphorylation sites, functional F-actin assay, multiple methods in one study","pmids":["36198272"],"is_preprint":false},{"year":2021,"finding":"Myosin 15 (Myo15) physically and functionally interacts with the Mical F-actin disassembly enzyme using its motor and MyTH4-FERM cargo-transporting functions to broaden Mical's distribution, thereby spatiotemporally propagating and directionally orienting Mical-mediated F-actin disassembly in response to Semaphorin/Plexin signals.","method":"Co-immunoprecipitation, genetic epistasis in Drosophila, high-resolution cellular imaging","journal":"Science advances","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP plus genetic epistasis, single lab","pmids":["33980493"],"is_preprint":false},{"year":2023,"finding":"Mical disassembles fascin-bundled F-actin; Mical-oxidized actin is poorly bundled by fascin (amplifying disassembly); cofilin synergizes with Mical to dramatically amplify disassembly of bundled F-actin beyond additive effects; Mical counteracts crosslinking/bundled F-actin in vivo to control cellular extension and Semaphorin/Plexin repulsion.","method":"In vitro biochemical assays with purified proteins, cryo-EM structural analysis, genetic experiments in Drosophila, high-resolution imaging","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro reconstitution plus structural data plus genetic epistasis, multiple orthogonal methods","pmids":["37725655"],"is_preprint":false},{"year":2024,"finding":"MICAL1 locally depolymerizes branched actin at HIV-1 budding sites; MICAL1 directly disassembles branched-actin networks; MICAL1 controls timely recruitment of ESCRT machinery during viral budding; Rab35 (MICAL1 activator) is recruited at budding sites and functions in the same pathway as MICAL1 for viral release.","method":"Superresolution microscopy, MICAL1 depletion (siRNA/KO), in vitro branched-actin disassembly assay, genetic epistasis with Arp2/3 inhibition","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro reconstitution of branched actin disassembly plus genetic epistasis plus superresolution imaging","pmids":["39556735"],"is_preprint":false},{"year":2025,"finding":"MICAL1 is shear-activated in platelets and promotes local F-actin disassembly around the GPIb-IX-V complex, enabling its translocation to lipid rafts and reinforcing VWF binding; MICAL1-deficient platelets display impaired adhesion and defective thrombus formation in vivo.","method":"Mouse MICAL1 KO, live-cell imaging under shear, lipid raft fractionation, in vivo thrombus formation assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — KO mouse with defined in vivo and in vitro phenotypes, mechanistic localization data","pmids":["40783397"],"is_preprint":false},{"year":2018,"finding":"ADLTE-causing MICAL-1 variants (p.Gly150Ser in the MO domain; p.Ala1065fs frameshift in C-terminal domain) significantly increase MICAL-1 oxidoreductase activity and induce cell contraction in COS7 cells, indicating gain-of-function dysregulation of actin dynamics as the disease mechanism.","method":"Cell-based oxidoreductase activity assay, cell morphology assay (COS7), genetic variant analysis","journal":"Annals of neurology","confidence":"Medium","confidence_rationale":"Tier 2 — functional enzyme activity measured in cells, but limited mechanistic depth","pmids":["29394500"],"is_preprint":false},{"year":2022,"finding":"Mical modulates Tau toxicity via oxidation of Tau cysteine residue Cys322 (not methionine); Mical-mediated cysteine oxidation of Tau alters its interactions with microtubules and actin cytoskeleton and affects Tau aggregation propensity in Drosophila Tauopathy model.","method":"Drosophila genetic interactions, Mical inhibitor, monooxygenase domain mutation, Tau cysteine mutant transgenes, mass spectrometry quantification of cysteine oxidation","journal":"Acta neuropathologica communications","confidence":"Medium","confidence_rationale":"Tier 2 — multiple genetic approaches plus MS, but in Drosophila model with mechanistic extrapolation to human MICAL1","pmids":["35379354"],"is_preprint":false},{"year":2023,"finding":"The SH3 domain of ASAP1 binds the proline-rich motif (PRM) of MICAL1 with sub-μM affinity through a unique interaction in which two negatively charged patches in ASAP1-SH3 recognize the 'xPx+Px+' sequence in MICAL1-PRM; crystal structure of the ASAP1-SH3/MICAL1-PRM complex was determined.","method":"Crystal structure determination, binding affinity measurements (ITC/SPR), mutational biochemistry","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 1 — crystal structure with binding data, but functional consequence in cells not demonstrated","pmids":["36674928"],"is_preprint":false},{"year":2020,"finding":"MICAL1 and WDR44 are direct GRAF2-binding partners; MICAL1 links GRAF1b/2 to Rab8a/b and Rab10; dominant negative mutants of MICAL1 interfere with Rab8/10/11-dependent export of E-cadherin, MMP14, and CFTR ΔF508 to the plasma membrane.","method":"Co-immunoprecipitation, colocalization, dominant-negative overexpression, cargo trafficking assays","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2-3 — binding confirmed by co-IP, functional role demonstrated by dominant-negative, single lab","pmids":["32344433"],"is_preprint":false},{"year":2007,"finding":"Drosophila MICAL is required in muscles for higher-order arrangement of myofilaments; in mical mutants, actin and myosin filaments are disorganized and accumulate beneath the plasma membrane instead of being integrated into regular sarcomeric patterns, causing synaptic growth defects.","method":"Drosophila loss-of-function genetics, RNAi transgene, immunohistochemistry, electron microscopy","journal":"Mechanisms of development","confidence":"Medium","confidence_rationale":"Tier 2 — genetic KO with defined cellular phenotype and ultrastructural analysis","pmids":["17350233"],"is_preprint":false},{"year":2015,"finding":"MICAL1 depletion in BRAF-mutant melanoma cells restores MST-1-dependent NDR phosphorylation and promotes rapid NDR-dependent apoptosis, confirming MICAL1 as a negative regulator of apoptosis in this context.","method":"siRNA knockdown, Western blot (NDR phosphorylation), apoptosis assays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 3 — phenotypic readout consistent with published mechanism (PMID 21730291), single lab","pmids":["25576923"],"is_preprint":false},{"year":2016,"finding":"MICAL1 controls breast cancer cell invasion by generating ROS that activates PI3K/Akt signaling; activated RAB35 binds to MICAL1, and RAB35 silencing represses ROS generation, Akt phosphorylation, and cell invasion in response to EGF.","method":"Co-immunoprecipitation, RAB35 pulldown activity assay, ROS measurement, Akt phosphorylation analysis, matrigel invasion assay","journal":"BMC cancer","confidence":"Medium","confidence_rationale":"Tier 3 — co-IP showing RAB35-MICAL1 interaction with functional consequence, single lab","pmids":["27430308"],"is_preprint":false}],"current_model":"MICAL1 is a FAD-containing flavoprotein monooxygenase that is autoinhibited by its C-terminal coiled-coil domain (as revealed by cryo-EM structure); upon activation by binding partners including Rab8 (GTP-bound) or PAK1-mediated phosphorylation downstream of CDC42, or by semaphorin-plexin-CRMP signaling, MICAL1 uses NADPH to stereospecifically oxidize Met44 and Met47 in the D-loop of actin, destabilizing filament contacts, which—alone and synergistically with cofilin—drives rapid F-actin disassembly; this oxidation is reversed by SelR/MsrB methionine sulfoxide reductase to restore normal actin polymerization properties; beyond actin, MICAL1 also oxidizes CaMKII Met308 to constrain its activity and protects against cardiac arrhythmias, and modulates Tau via cysteine oxidation; MICAL1 additionally interacts with NDR kinases to suppress MST-NDR proapoptotic signaling and serves roles in cytokinetic abscission, platelet mechanotransduction, and HIV-1 budding through local actin disassembly."},"narrative":{"teleology":[{"year":2002,"claim":"The initial molecular identity of MICAL1 was established as a cytoplasmic protein associating with CasL and vimentin intermediate filaments, providing the first interaction partners but leaving enzymatic function unknown.","evidence":"Far Western screening and co-immunoprecipitation with domain mapping in human cells","pmids":["11827972"],"confidence":"Medium","gaps":["No enzymatic activity characterized","Functional consequence of CasL/vimentin interactions not defined","Single-lab study without independent replication"]},{"year":2005,"claim":"Structural and enzymatic characterization revealed that MICAL1's N-terminal domain is an FAD-containing monooxygenase resembling p-hydroxybenzoate hydroxylase that consumes NADPH and generates H₂O₂, establishing it as a redox enzyme but leaving its physiological substrate unidentified.","evidence":"Two independent crystal structures (1.45 Å and 2.0 Å) plus in vitro NADPH oxidase kinetics","pmids":["16275925","16275926"],"confidence":"High","gaps":["Physiological protein substrate not identified","Relationship to cytoskeletal function not established"]},{"year":2008,"claim":"Discovery that MICAL is autoinhibited by its C-terminal domain and that semaphorin–plexin–CRMP signaling relieves this autoinhibition established how upstream guidance cues activate the enzyme, though the structural basis remained unclear.","evidence":"Co-immunoprecipitation of CRMP and Plexin with MICAL domains, enzyme activity assays with truncations","pmids":["18305261"],"confidence":"High","gaps":["No structural model of full-length autoinhibited state","Mechanism of autoinhibition release not resolved at atomic level"]},{"year":2010,"claim":"The breakthrough demonstration that MICAL directly binds and disassembles F-actin using its redox activity — and is necessary and sufficient for semaphorin-plexin cytoskeletal remodeling in vivo — identified actin as the physiological substrate.","evidence":"Purified-protein F-actin disassembly assay plus Drosophila genetic loss/gain-of-function","pmids":["20148037"],"confidence":"High","gaps":["Specific chemical modification on actin not yet identified","Mechanism of filament destabilization unknown"]},{"year":2011,"claim":"Identification of Met44 in actin's D-loop as the stereospecifically oxidized residue defined MICAL as a post-translational modifier of actin that simultaneously severs filaments and inhibits repolymerization, while a parallel study revealed MICAL1 suppresses NDR kinase–MST proapoptotic signaling through a distinct scaffolding interaction.","evidence":"In vitro biochemistry with site-specific modification analysis (actin); MS-based proteomics and co-IP with kinase assays (NDR)","pmids":["22116028","21730291"],"confidence":"High","gaps":["Role of Met47 oxidation not characterized","Structural basis of filament instability upon oxidation unknown","Whether NDR regulation depends on redox activity unclear"]},{"year":2013,"claim":"Discovery that SelR/MsrB specifically reduces Mical-oxidized actin Met44-R-sulfoxide back to methionine established that MICAL-mediated actin modification is a reversible regulatory switch, not irreversible damage.","evidence":"Drosophila genetic screen, in vitro enzymatic reconstitution with purified SelR and Mical-oxidized actin","pmids":["24212093"],"confidence":"High","gaps":["Spatiotemporal regulation of SelR-MICAL balance in cells not characterized","Whether additional reductases contribute is unknown"]},{"year":2016,"claim":"Demonstration that MICAL-oxidized actin synergizes with cofilin — by increasing cofilin binding and overriding tropomyosin protection — revealed how two independent disassembly pathways converge for rapid F-actin destruction in vivo; kinetic characterization quantified the ~10-fold autoinhibition by the C-terminal domain.","evidence":"In vitro TIRF single-filament assays, Drosophila genetics, steady-state enzyme kinetics with truncation constructs","pmids":["27454820","26845023"],"confidence":"High","gaps":["Structural mechanism of cofilin recognition of oxidized actin not resolved","Regulation of MICAL1 versus MICAL2 activity in non-neuronal cells poorly defined"]},{"year":2017,"claim":"Cryo-EM of Mical-oxidized actin filaments revealed how Met44 reorientation and a new Met47-O–Thr351 intermolecular bond destabilize intersubunit contacts, causing nucleotide-state-dependent catastrophic disassembly at ~84 subunits/s.","evidence":"3.9 Å cryo-EM of oxidized F-actin, single-filament TIRF, site-directed mutagenesis","pmids":["29259197"],"confidence":"High","gaps":["No structure of MICAL bound to F-actin","Whether oxidation affects actin-binding protein interactions beyond cofilin and fascin not fully explored"]},{"year":2018,"claim":"Rab8-GTP was shown to bind and allosterically activate MICAL1 (4-fold kcat increase), defining a Rab-based activation mechanism; separately, ADLTE-associated MICAL1 variants were found to be gain-of-function, linking hyperactive actin oxidation to human epilepsy.","evidence":"Enzyme kinetics and SAXS for Rab8 activation; cell-based oxidoreductase and morphology assays for ADLTE variants","pmids":["30242933","29394500"],"confidence":"High","gaps":["How Rab8 binding relieves autoinhibition structurally was not resolved","ADLTE mechanism in neurons not demonstrated in vivo","ADLTE finding from a single family study with limited mechanistic depth"]},{"year":2020,"claim":"MICAL1 was established as a CaMKII regulator: stereospecific oxidation of CaMKII Met308 restrains kinase activity, and MICAL1 knockout mice develop lethal cardiac arrhythmias from CaMKII hyperactivation, demonstrating a non-actin substrate with major physiological consequences.","evidence":"Mouse knockout, in vitro biochemistry, human iPSC-derived cardiomyocytes, Drosophila genetics","pmids":["32749237"],"confidence":"High","gaps":["Whether additional MICAL1 substrates beyond actin and CaMKII exist is unknown","Tissue-specific regulation of MICAL1 toward actin versus CaMKII not defined"]},{"year":2022,"claim":"PAK1 phosphorylation of MICAL1 on N-terminal serine residues (downstream of CDC42) was identified as an activation mechanism that accelerates F-actin disassembly, adding a kinase-dependent input alongside Rab-GTPase activation; separately, Mical was shown to oxidize Tau Cys322 to modulate tauopathy.","evidence":"Co-IP, MS phosphosite mapping, F-actin assays for PAK1; Drosophila genetics and MS for Tau oxidation","pmids":["36198272","35379354"],"confidence":"High","gaps":["Whether PAK1 and Rab activation are synergistic or independent is unknown","Tau oxidation only shown in Drosophila model, human relevance unclear"]},{"year":2024,"claim":"Full-length cryo-EM structure at 3.1 Å finally resolved the autoinhibition mechanism: the C-terminal coiled-coil directly contacts the catalytic domain to block F-actin access, with CH-L2α1-LIM domains stabilizing this conformation; in parallel, MICAL1 was shown to disassemble branched actin at HIV-1 budding sites in a Rab35-dependent pathway enabling ESCRT recruitment.","evidence":"Cryo-EM of full-length human MICAL1 with biochemical validation; superresolution microscopy, siRNA/KO, in vitro branched-actin disassembly","pmids":["39532862","39556735"],"confidence":"High","gaps":["No structure of activated MICAL1 bound to F-actin or Rab","How MICAL1 is spatially targeted to HIV budding sites beyond Rab35 is unclear"]},{"year":2025,"claim":"MICAL1 was identified as a shear-activated actin regulator in platelets that promotes GPIb-IX-V translocation to lipid rafts for VWF binding, establishing a role in hemostasis and thrombus formation.","evidence":"MICAL1 knockout mice, live-cell imaging under shear, lipid raft fractionation, in vivo thrombus assay","pmids":["40783397"],"confidence":"High","gaps":["Mechanism of shear-dependent MICAL1 activation is unknown","Whether MICAL1 oxidizes platelet-specific substrates beyond actin is untested"]},{"year":null,"claim":"Key unresolved questions include the structural basis of MICAL1's interaction with F-actin in the activated state, how multiple activation inputs (Rab GTPases, PAK1 phosphorylation, plexin/CRMP) are integrated, the full scope of MICAL1's substrate repertoire beyond actin and CaMKII, and the pathogenic mechanism of MICAL1 gain-of-function in ADLTE at the neural circuit level.","evidence":"","pmids":[],"confidence":"High","gaps":["No structure of MICAL1-F-actin complex","Integration of multiple activation pathways not studied","Complete substrate repertoire undefined","ADLTE circuit-level mechanism unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[0,1,3,7,8,18]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[2,6,7,21]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[3,8,25]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[12,29]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[13,14]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[2,13,28]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,15,16]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[15,16]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[12,29]},{"term_id":"R-HSA-109582","term_label":"Hemostasis","supporting_discovery_ids":[23]}],"complexes":[],"partners":["CFL1","RAB8A","RAB35","PAK1","CRMP1","NDR1","ASAP1","PLXNA1"],"other_free_text":[]},"mechanistic_narrative":"MICAL1 is an NADPH-dependent flavoprotein monooxygenase that serves as a central actin-disassembly enzyme, linking upstream signaling cues to rapid cytoskeletal remodeling across diverse cellular contexts including axon guidance, cytokinesis, platelet mechanotransduction, and viral budding. Its N-terminal FAD-containing catalytic domain stereospecifically oxidizes Met44 and Met47 in the D-loop of F-actin, destabilizing intersubunit contacts and synergizing with cofilin to drive catastrophic filament disassembly — a modification reversed by SelR/MsrB methionine sulfoxide reductases [PMID:22116028, PMID:27454820, PMID:24212093]. MICAL1 is maintained in an autoinhibited state by intramolecular interaction between its C-terminal coiled-coil domain and catalytic domain, and is activated by GTP-bound Rab GTPases (Rab8, Rab35), PAK1-mediated phosphorylation downstream of CDC42, and semaphorin–plexin–CRMP signaling [PMID:39532862, PMID:30242933, PMID:36198272, PMID:18305261]. Beyond actin, MICAL1 oxidizes CaMKII Met308 to restrain kinase activity and protect against cardiac arrhythmias, modulates Tau via Cys322 oxidation, and suppresses MST–NDR proapoptotic signaling; gain-of-function variants cause autosomal dominant lateral temporal lobe epilepsy (ADLTE) [PMID:32749237, PMID:35379354, PMID:21730291, PMID:29394500]."},"prefetch_data":{"uniprot":{"accession":"Q8TDZ2","full_name":"[F-actin]-monooxygenase MICAL1","aliases":["Molecule interacting with CasL protein 1","MICAL-1","NEDD9-interacting protein with calponin homology and LIM domains"],"length_aa":1067,"mass_kda":117.9,"function":"Monooxygenase that promotes depolymerization of F-actin by mediating oxidation of specific methionine residues on actin to form methionine-sulfoxide, resulting in actin filament disassembly and preventing repolymerization (PubMed:29343822). In the absence of actin, it also functions as a NADPH oxidase producing H(2)O(2) (PubMed:21864500, PubMed:26845023, PubMed:29343822). Acts as a cytoskeletal regulator that connects NEDD9 to intermediate filaments. Also acts as a negative regulator of apoptosis via its interaction with STK38 and STK38L; acts by antagonizing STK38 and STK38L activation by MST1/STK4. Involved in regulation of lamina-specific connectivity in the nervous system such as the development of lamina-restricted hippocampal connections. Through redox regulation of the actin cytoskeleton controls the intracellular distribution of secretory vesicles containing L1/neurofascin/NgCAM family proteins in neurons, thereby regulating their cell surface levels (By similarity). May act as Rab effector protein and play a role in vesicle trafficking. 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proteins via MICAL.","date":"2020","source":"Biochemical Society transactions","url":"https://pubmed.ncbi.nlm.nih.gov/32219383","citation_count":9,"is_preprint":false},{"pmid":"27223600","id":"PMC_27223600","title":"A simple and efficient method for generating high-quality recombinant Mical enzyme for in vitro assays.","date":"2016","source":"Protein expression and purification","url":"https://pubmed.ncbi.nlm.nih.gov/27223600","citation_count":9,"is_preprint":false},{"pmid":"33647394","id":"PMC_33647394","title":"MICAL1 (molecule interacting with CasL 1) protects oligodendrocyte cells from oxidative injury through regulating apoptosis, autophagy in spinal cord injury.","date":"2021","source":"Neuroscience letters","url":"https://pubmed.ncbi.nlm.nih.gov/33647394","citation_count":9,"is_preprint":false},{"pmid":"18413246","id":"PMC_18413246","title":"Identification and characterization of JRAB/MICAL-L2, a junctional Rab13-binding protein.","date":"2008","source":"Methods in enzymology","url":"https://pubmed.ncbi.nlm.nih.gov/18413246","citation_count":8,"is_preprint":false},{"pmid":"39556735","id":"PMC_39556735","title":"HIV-1 budding requires cortical actin disassembly by the oxidoreductase MICAL1.","date":"2024","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/39556735","citation_count":7,"is_preprint":false},{"pmid":"36674928","id":"PMC_36674928","title":"Crystal Structure of the SH3 Domain of ASAP1 in Complex with the Proline Rich Motif (PRM) of MICAL1 Reveals a Unique SH3/PRM Interaction Mode.","date":"2023","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/36674928","citation_count":7,"is_preprint":false},{"pmid":"17662518","id":"PMC_17662518","title":"Investigation of the four cooperative unfolding units existing in the MICAL-1 CH domain.","date":"2007","source":"Biophysical chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/17662518","citation_count":7,"is_preprint":false},{"pmid":"38508474","id":"PMC_38508474","title":"PlexinA1 promotes gastric cancer migration through preventing MICAL1 protein ubiquitin/proteasome-mediated degradation in a Rac1-dependent manner.","date":"2024","source":"Biochimica et biophysica acta. Molecular basis of disease","url":"https://pubmed.ncbi.nlm.nih.gov/38508474","citation_count":6,"is_preprint":false},{"pmid":"27770767","id":"PMC_27770767","title":"MICAL-like Regulates Fasciclin II Membrane Cycling and Synaptic Development.","date":"2016","source":"Molecules and cells","url":"https://pubmed.ncbi.nlm.nih.gov/27770767","citation_count":6,"is_preprint":false},{"pmid":"21749956","id":"PMC_21749956","title":"Neuronal guidance: a redox signal involving Mical.","date":"2010","source":"Current biology : CB","url":"https://pubmed.ncbi.nlm.nih.gov/21749956","citation_count":6,"is_preprint":false},{"pmid":"29468157","id":"PMC_29468157","title":"Dancing Styles of Collective Cell Migration: Image-Based Computational Analysis of JRAB/MICAL-L2.","date":"2018","source":"Frontiers in cell and developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/29468157","citation_count":5,"is_preprint":false},{"pmid":"38729448","id":"PMC_38729448","title":"MICAL-L2, as an estrogen-responsive gene, is involved in ER-positive breast cancer cell progression and tamoxifen sensitivity via the AKT/mTOR pathway.","date":"2024","source":"Biochemical pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/38729448","citation_count":5,"is_preprint":false},{"pmid":"39532862","id":"PMC_39532862","title":"Structural basis of MICAL autoinhibition.","date":"2024","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/39532862","citation_count":4,"is_preprint":false},{"pmid":"34100897","id":"PMC_34100897","title":"MICAL-L1 is required for cargo protein delivery to the cell surface.","date":"2021","source":"Biology open","url":"https://pubmed.ncbi.nlm.nih.gov/34100897","citation_count":4,"is_preprint":false},{"pmid":"27787866","id":"PMC_27787866","title":"Podocyte Shape Regulation by Semaphorin 3A and MICAL-1.","date":"2017","source":"Methods in molecular biology (Clifton, N.J.)","url":"https://pubmed.ncbi.nlm.nih.gov/27787866","citation_count":4,"is_preprint":false},{"pmid":"29497471","id":"PMC_29497471","title":"Common effects of attractive and repulsive signaling: Further analysis of Mical-mediated F-actin disassembly and regulation by Abl.","date":"2018","source":"Communicative & integrative biology","url":"https://pubmed.ncbi.nlm.nih.gov/29497471","citation_count":4,"is_preprint":false},{"pmid":"38654463","id":"PMC_38654463","title":"A de novo pathogenic variant in MICAL-1 causes epilepsy with auditory features.","date":"2024","source":"Epilepsia open","url":"https://pubmed.ncbi.nlm.nih.gov/38654463","citation_count":3,"is_preprint":false},{"pmid":"33671465","id":"PMC_33671465","title":"Enhanced Production of the Mical Redox Domain for Enzymology and F-actin Disassembly Assays.","date":"2021","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/33671465","citation_count":3,"is_preprint":false},{"pmid":"24377937","id":"PMC_24377937","title":"MICAL-like1 in endosomal signaling.","date":"2014","source":"Methods in enzymology","url":"https://pubmed.ncbi.nlm.nih.gov/24377937","citation_count":3,"is_preprint":false},{"pmid":"39382837","id":"PMC_39382837","title":"Endosomal actin branching, fission, and receptor recycling require FCHSD2 recruitment by MICAL-L1.","date":"2024","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/39382837","citation_count":2,"is_preprint":false},{"pmid":"38555517","id":"PMC_38555517","title":"Elucidating the role of MICAL1 in pan-cancer using integrated bioinformatics and experimental approaches.","date":"2024","source":"Cell adhesion & migration","url":"https://pubmed.ncbi.nlm.nih.gov/38555517","citation_count":2,"is_preprint":false},{"pmid":"39689763","id":"PMC_39689763","title":"High MICAL-L2 promotes cancer progression and drug resistance in renal clear cell carcinoma cells through stabilization of ACTN4 following vimentin expression.","date":"2024","source":"Biochimica et biophysica acta. Molecular basis of disease","url":"https://pubmed.ncbi.nlm.nih.gov/39689763","citation_count":2,"is_preprint":false},{"pmid":"39954154","id":"PMC_39954154","title":"MICAL1 Mediates TGF-β1-Induced Epithelial-to-Mesenchymal Transition and Metastasis of Hepatocellular Carcinoma by Activating Smad2/3.","date":"2025","source":"Cell biochemistry and biophysics","url":"https://pubmed.ncbi.nlm.nih.gov/39954154","citation_count":1,"is_preprint":false},{"pmid":"38068973","id":"PMC_38068973","title":"Actin Isoform Composition and Binding Factors Fine-Tune Regulatory Impact of Mical Enzymes.","date":"2023","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/38068973","citation_count":1,"is_preprint":false},{"pmid":"40740057","id":"PMC_40740057","title":"CIN85 and CD2AP Are Novel Constituents of Dynamic Tubular Recycling Endosomes That Regulate Recycling Upon Recruitment by MICAL-L1.","date":"2025","source":"Traffic (Copenhagen, Denmark)","url":"https://pubmed.ncbi.nlm.nih.gov/40740057","citation_count":1,"is_preprint":false},{"pmid":"40783397","id":"PMC_40783397","title":"F-actin disassembly by the oxidoreductase MICAL1 promotes mechano-dependent VWF-GPIbα interaction in platelets.","date":"2025","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/40783397","citation_count":0,"is_preprint":false},{"pmid":"38979241","id":"PMC_38979241","title":"Endosomal actin branching, fission and receptor recycling require FCHSD2 recruitment by MICAL-L1.","date":"2024","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/38979241","citation_count":0,"is_preprint":false},{"pmid":"38705457","id":"PMC_38705457","title":"A novel splicing variant in MICAL-1 gene is associated with epilepsy.","date":"2024","source":"European journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/38705457","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":45710,"output_tokens":7022,"usd":0.12123},"stage2":{"model":"claude-opus-4-6","input_tokens":10752,"output_tokens":3634,"usd":0.216915},"total_usd":0.338145,"stage1_batch_id":"msgbatch_01Mgbec4vM6c9vXht7JVJzss","stage2_batch_id":"msgbatch_01JkuuH5RB2BdJNsgnhjbC6s","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2005,\n      \"finding\": \"Crystal structure of the FAD-containing monooxygenase (MO) domain of mouse MICAL-1 (residues 1-489) at 1.45 Å resolution reveals topology closely resembling NADPH-dependent flavoenzyme p-hydroxybenzoate hydroxylase (PHBH); the flavin ring switches between two discrete positions coupled with opening of a channel to the active site, suggestive of a protein substrate.\",\n      \"method\": \"X-ray crystallography (1.45 Å), NADPH reaction comparison\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution crystal structure with functional mechanistic implication, two independent structural papers published simultaneously\",\n      \"pmids\": [\"16275925\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The N-terminal FAD-containing domain of MICAL is a flavoenzyme that in the presence of NADPH reduces molecular oxygen to H2O2 (Km,NADPH = 222 μM; kcat = 77 s−1), suggesting H2O2 as a signaling molecule in axon guidance.\",\n      \"method\": \"Biochemical in vitro enzyme assay, X-ray crystallography (2.0 Å)\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure plus in vitro enzymatic reconstitution with kinetic parameters\",\n      \"pmids\": [\"16275926\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MICAL directly binds F-actin and disassembles both individual and bundled actin filaments using its redox (monooxygenase) activity; MICAL is necessary and sufficient for semaphorin-plexin-mediated F-actin reorganization in vivo.\",\n      \"method\": \"Purified protein in vitro F-actin disassembly assay, genetic loss-of-function and gain-of-function in Drosophila, NADPH-dependent redox activity requirement\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstituted in vitro with purified proteins plus genetic epistasis in vivo, highly cited foundational paper\",\n      \"pmids\": [\"20148037\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Mical directly and stereospecifically oxidizes methionine 44 (Met44) in the D-loop of actin, simultaneously severing filaments and decreasing polymerization; actin is a specific substrate of the Mical monooxygenase.\",\n      \"method\": \"In vitro biochemical assay with purified Mical and actin, site-specific modification analysis, polymerization assays\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with identification of specific oxidized residue, replicated by multiple labs\",\n      \"pmids\": [\"22116028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SelR (MsrB methionine sulfoxide reductase) specifically reduces Mical-oxidized actin (actin Met-44-R-sulfoxide) back to methionine, restoring normal polymerization properties and reversing Mical-mediated F-actin disassembly and Semaphorin-Plexin repulsion in vivo.\",\n      \"method\": \"Genetic screen (Drosophila), in vitro enzyme assay with purified SelR and Mical-oxidized actin, polymerization assays\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro enzymatic reconstitution plus genetic epistasis, reveals reversibility of actin oxidation\",\n      \"pmids\": [\"24212093\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"MICAL enzymatic activity is autoinhibited by its own C-terminal domain; CRMP and Plexin associate with non-enzymatic and enzymatic domains of MICAL respectively, and together release this autoinhibition; Semaphorin signaling promotes the CRMP-MICAL physical association.\",\n      \"method\": \"Co-immunoprecipitation, domain-deletion biochemical assays, enzyme activity measurements\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP plus enzymatic activity assays demonstrating autoinhibition mechanism with multiple orthogonal approaches\",\n      \"pmids\": [\"18305261\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Mical-mediated oxidation of actin Met44 (and Met47) improves cofilin binding to filaments; combined Mical oxidation and cofilin dramatically accelerates F-actin disassembly (synergism) compared to either effector alone, and this synergism is necessary and sufficient for F-actin disassembly in vivo.\",\n      \"method\": \"In vitro F-actin disassembly assays with purified proteins, TIRF microscopy, genetic experiments in Drosophila\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro biochemical reconstitution plus genetic epistasis, multiple orthogonal methods\",\n      \"pmids\": [\"27454820\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Mical oxidizes actin's M44 and M47 residues; cryo-EM (3.9 Å) reveals that oxidation reorients M44 side chain and induces a new M47-O-T351 intermolecular interaction promoting Mox-actin instability; Mox-actin undergoes catastrophically fast disassembly (84 subunits/s) that is nucleotide-state dependent; Mical oxidation allows cofilin severing even in presence of inorganic phosphate.\",\n      \"method\": \"Near-atomic cryo-EM (3.9 Å), single-filament TIRF microscopy, site-directed mutagenesis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structure plus mutagenesis plus single-molecule assays in one study\",\n      \"pmids\": [\"29259197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MICAL1 oxidizes Met308 in the calmodulin-binding domain of CaMKII stereospecifically; oxidized or mutant M308V CaMKII shows decreased CaM binding and CaMKII activity; absence of MICAL1 in mice causes cardiac arrhythmias and premature death due to CaMKII hyperactivation; MSRB reverses this oxidation.\",\n      \"method\": \"Mouse knockout, in vitro biochemical assays, cell-based functional assays, human iPSC-derived cardiomyocytes, Drosophila genetics\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple model organisms, KO mice with defined phenotype, in vitro biochemical validation of the oxidation mechanism\",\n      \"pmids\": [\"32749237\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MICAL1-mediated oxidation of actin filaments suppresses their protection from cofilin severing: oxidation increases cofilin binding and severing rates by orders of magnitude, allows phosphomimetic S3D-cofilin (normally inactive) to sever oxidized filaments, and abolishes tropomyosin Tpm1.8 protection of filaments.\",\n      \"method\": \"Single-filament in vitro assays with purified proteins, fluorescence microscopy\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — rigorous single-molecule reconstitution with multiple orthogonal mechanistic tests\",\n      \"pmids\": [\"33393173\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Cryo-EM structure of full-length human MICAL1 at 3.1 Å shows autoinhibition is mediated by intramolecular interaction between N-terminal catalytic domain and C-terminal coiled-coil domain that blocks F-actin interaction; allosteric changes in the coiled-coil and binding of CH-L2α1-LIM domains to the coiled-coil are required for activation/autoinhibition.\",\n      \"method\": \"Cryo-EM (3.1 Å nominal resolution), biochemical and functional validation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — full-length cryo-EM structure plus biochemical functional validation\",\n      \"pmids\": [\"39532862\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Active GTP-bound Rab8 binds full-length MICAL1 (apparent Kd ~8 μM, 1:1 complex) and stabilizes its active conformation, causing a specific 4-fold increase in kcat of the NADPH oxidase reaction; the region preceding the C-terminal Rab-binding domain masks one Rab-binding site in the autoinhibited state.\",\n      \"method\": \"Enzyme kinetics, small-angle X-ray scattering (SAXS), binding assays\",\n      \"journal\": \"Protein science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro kinetic reconstitution plus SAXS structural modeling with defined Kd\",\n      \"pmids\": [\"30242933\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MICAL-1 interacts with the hydrophobic motif of NDR1/2 kinases; overexpression or knockdown of MICAL-1 reduces or augments NDR kinase activation respectively; MICAL-1 competes with MST1 for NDR binding and thereby antagonizes MST1-induced NDR kinase activation and NDR-dependent proapoptotic signaling.\",\n      \"method\": \"Proteomics/mass spectrometry, co-immunoprecipitation, kinase activity assays, siRNA knockdown, overexpression\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — MS-identified interaction confirmed by co-IP, enzymatic activity measurements, and loss/gain of function with defined phenotype\",\n      \"pmids\": [\"21730291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"MICAL (human MICAL1) associates with CasL through its PPKPP proline-rich sequence and with vimentin intermediate filaments through its C-terminal region; MICAL colocalizes with vimentin intermediate filaments as a cytoplasmic protein.\",\n      \"method\": \"Far Western screening, co-immunoprecipitation, domain-deletion mapping, immunostaining\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — reciprocal co-IP with domain mapping, single lab\",\n      \"pmids\": [\"11827972\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"MICAL-1 isoforms interact with Rab1 GTPase in a nucleotide-dependent manner (active GTP-bound form); the Rab1-interacting domain maps to the C-terminus of MICAL-1, which also mediates vimentin binding; MICAL-1 is predominantly cytosolic.\",\n      \"method\": \"Yeast two-hybrid, GST pulldown, cell fractionation\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — yeast two-hybrid confirmed by GST pulldown, single lab, limited functional follow-up\",\n      \"pmids\": [\"12788069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Mical (Drosophila ortholog) mediates dendrite severing during pruning downstream of Sox14 transcription factor; Sox14 directly regulates mical expression, and overexpression of Mical significantly rescues pruning defects in sox14 mutants, establishing a Sox14-Mical pathway for dendrite severing.\",\n      \"method\": \"Drosophila genetics (mutant analysis, epistasis, rescue experiments)\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with rescue experiment defining pathway position, replicated with multiple genetic tools\",\n      \"pmids\": [\"19881505\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Vertebrate MICAL-1 regulates targeting of secretory vesicles containing IgCAM cell adhesion molecules to the neuronal growth cone membrane via its ability to control the actin cytoskeleton using redox chemistry, thereby maintaining appropriate IgCAM cell surface levels essential for mossy fibre axon lamina-specific targeting in vivo.\",\n      \"method\": \"Mouse in vivo loss-of-function, live cell imaging, biochemical fractionation\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KO with defined cellular and axon targeting phenotype, multiple methods\",\n      \"pmids\": [\"25007825\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MICAL1 is autoinhibited by its C-terminal coiled-coil region in non-neural cells; MICAL2 is constitutively active; both MICAL1 and MICAL2 regulate actin stress fibers through ROS generation.\",\n      \"method\": \"Overexpression and knockdown of truncation mutants in HeLa cells, actin staining, ROS measurement\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — cell-based domain analysis with phenotypic readout, single lab\",\n      \"pmids\": [\"22331357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MICAL1 NADPH oxidase and F-actin depolymerizing activity is regulated by C-terminal, LIM, and CH domains: the C-terminus causes ~10-fold decrease of kcat (autoinhibition) and ~10-fold increase in Km for actin; F-actin lowers Km,NADPH and increases kcat for all MICAL forms.\",\n      \"method\": \"In vitro biochemical characterization of truncated/full-length MICAL1 forms, kinetic measurements\",\n      \"journal\": \"Archives of biochemistry and biophysics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — rigorous in vitro enzymology with multiple truncation constructs and kinetic parameters\",\n      \"pmids\": [\"26845023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The CDC42 GTPase effector PAK1 physically associates with and phosphorylates MICAL1 on two serine residues at the N-terminal catalytic monooxygenase and calponin homology domains, leading to accelerated F-actin disassembly; extracellular ligand stimulation leads to PAK-dependent MICAL1 phosphorylation.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, phosphorylation assays, F-actin disassembly assays, domain-mapping\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP confirmed binding, MS identified phosphorylation sites, functional F-actin assay, multiple methods in one study\",\n      \"pmids\": [\"36198272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Myosin 15 (Myo15) physically and functionally interacts with the Mical F-actin disassembly enzyme using its motor and MyTH4-FERM cargo-transporting functions to broaden Mical's distribution, thereby spatiotemporally propagating and directionally orienting Mical-mediated F-actin disassembly in response to Semaphorin/Plexin signals.\",\n      \"method\": \"Co-immunoprecipitation, genetic epistasis in Drosophila, high-resolution cellular imaging\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP plus genetic epistasis, single lab\",\n      \"pmids\": [\"33980493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Mical disassembles fascin-bundled F-actin; Mical-oxidized actin is poorly bundled by fascin (amplifying disassembly); cofilin synergizes with Mical to dramatically amplify disassembly of bundled F-actin beyond additive effects; Mical counteracts crosslinking/bundled F-actin in vivo to control cellular extension and Semaphorin/Plexin repulsion.\",\n      \"method\": \"In vitro biochemical assays with purified proteins, cryo-EM structural analysis, genetic experiments in Drosophila, high-resolution imaging\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro reconstitution plus structural data plus genetic epistasis, multiple orthogonal methods\",\n      \"pmids\": [\"37725655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MICAL1 locally depolymerizes branched actin at HIV-1 budding sites; MICAL1 directly disassembles branched-actin networks; MICAL1 controls timely recruitment of ESCRT machinery during viral budding; Rab35 (MICAL1 activator) is recruited at budding sites and functions in the same pathway as MICAL1 for viral release.\",\n      \"method\": \"Superresolution microscopy, MICAL1 depletion (siRNA/KO), in vitro branched-actin disassembly assay, genetic epistasis with Arp2/3 inhibition\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro reconstitution of branched actin disassembly plus genetic epistasis plus superresolution imaging\",\n      \"pmids\": [\"39556735\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"MICAL1 is shear-activated in platelets and promotes local F-actin disassembly around the GPIb-IX-V complex, enabling its translocation to lipid rafts and reinforcing VWF binding; MICAL1-deficient platelets display impaired adhesion and defective thrombus formation in vivo.\",\n      \"method\": \"Mouse MICAL1 KO, live-cell imaging under shear, lipid raft fractionation, in vivo thrombus formation assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — KO mouse with defined in vivo and in vitro phenotypes, mechanistic localization data\",\n      \"pmids\": [\"40783397\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ADLTE-causing MICAL-1 variants (p.Gly150Ser in the MO domain; p.Ala1065fs frameshift in C-terminal domain) significantly increase MICAL-1 oxidoreductase activity and induce cell contraction in COS7 cells, indicating gain-of-function dysregulation of actin dynamics as the disease mechanism.\",\n      \"method\": \"Cell-based oxidoreductase activity assay, cell morphology assay (COS7), genetic variant analysis\",\n      \"journal\": \"Annals of neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional enzyme activity measured in cells, but limited mechanistic depth\",\n      \"pmids\": [\"29394500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Mical modulates Tau toxicity via oxidation of Tau cysteine residue Cys322 (not methionine); Mical-mediated cysteine oxidation of Tau alters its interactions with microtubules and actin cytoskeleton and affects Tau aggregation propensity in Drosophila Tauopathy model.\",\n      \"method\": \"Drosophila genetic interactions, Mical inhibitor, monooxygenase domain mutation, Tau cysteine mutant transgenes, mass spectrometry quantification of cysteine oxidation\",\n      \"journal\": \"Acta neuropathologica communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic approaches plus MS, but in Drosophila model with mechanistic extrapolation to human MICAL1\",\n      \"pmids\": [\"35379354\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"The SH3 domain of ASAP1 binds the proline-rich motif (PRM) of MICAL1 with sub-μM affinity through a unique interaction in which two negatively charged patches in ASAP1-SH3 recognize the 'xPx+Px+' sequence in MICAL1-PRM; crystal structure of the ASAP1-SH3/MICAL1-PRM complex was determined.\",\n      \"method\": \"Crystal structure determination, binding affinity measurements (ITC/SPR), mutational biochemistry\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with binding data, but functional consequence in cells not demonstrated\",\n      \"pmids\": [\"36674928\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MICAL1 and WDR44 are direct GRAF2-binding partners; MICAL1 links GRAF1b/2 to Rab8a/b and Rab10; dominant negative mutants of MICAL1 interfere with Rab8/10/11-dependent export of E-cadherin, MMP14, and CFTR ΔF508 to the plasma membrane.\",\n      \"method\": \"Co-immunoprecipitation, colocalization, dominant-negative overexpression, cargo trafficking assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — binding confirmed by co-IP, functional role demonstrated by dominant-negative, single lab\",\n      \"pmids\": [\"32344433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Drosophila MICAL is required in muscles for higher-order arrangement of myofilaments; in mical mutants, actin and myosin filaments are disorganized and accumulate beneath the plasma membrane instead of being integrated into regular sarcomeric patterns, causing synaptic growth defects.\",\n      \"method\": \"Drosophila loss-of-function genetics, RNAi transgene, immunohistochemistry, electron microscopy\",\n      \"journal\": \"Mechanisms of development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with defined cellular phenotype and ultrastructural analysis\",\n      \"pmids\": [\"17350233\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MICAL1 depletion in BRAF-mutant melanoma cells restores MST-1-dependent NDR phosphorylation and promotes rapid NDR-dependent apoptosis, confirming MICAL1 as a negative regulator of apoptosis in this context.\",\n      \"method\": \"siRNA knockdown, Western blot (NDR phosphorylation), apoptosis assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — phenotypic readout consistent with published mechanism (PMID 21730291), single lab\",\n      \"pmids\": [\"25576923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MICAL1 controls breast cancer cell invasion by generating ROS that activates PI3K/Akt signaling; activated RAB35 binds to MICAL1, and RAB35 silencing represses ROS generation, Akt phosphorylation, and cell invasion in response to EGF.\",\n      \"method\": \"Co-immunoprecipitation, RAB35 pulldown activity assay, ROS measurement, Akt phosphorylation analysis, matrigel invasion assay\",\n      \"journal\": \"BMC cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — co-IP showing RAB35-MICAL1 interaction with functional consequence, single lab\",\n      \"pmids\": [\"27430308\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MICAL1 is a FAD-containing flavoprotein monooxygenase that is autoinhibited by its C-terminal coiled-coil domain (as revealed by cryo-EM structure); upon activation by binding partners including Rab8 (GTP-bound) or PAK1-mediated phosphorylation downstream of CDC42, or by semaphorin-plexin-CRMP signaling, MICAL1 uses NADPH to stereospecifically oxidize Met44 and Met47 in the D-loop of actin, destabilizing filament contacts, which—alone and synergistically with cofilin—drives rapid F-actin disassembly; this oxidation is reversed by SelR/MsrB methionine sulfoxide reductase to restore normal actin polymerization properties; beyond actin, MICAL1 also oxidizes CaMKII Met308 to constrain its activity and protects against cardiac arrhythmias, and modulates Tau via cysteine oxidation; MICAL1 additionally interacts with NDR kinases to suppress MST-NDR proapoptotic signaling and serves roles in cytokinetic abscission, platelet mechanotransduction, and HIV-1 budding through local actin disassembly.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"MICAL1 is an NADPH-dependent flavoprotein monooxygenase that serves as a central actin-disassembly enzyme, linking upstream signaling cues to rapid cytoskeletal remodeling across diverse cellular contexts including axon guidance, cytokinesis, platelet mechanotransduction, and viral budding. Its N-terminal FAD-containing catalytic domain stereospecifically oxidizes Met44 and Met47 in the D-loop of F-actin, destabilizing intersubunit contacts and synergizing with cofilin to drive catastrophic filament disassembly — a modification reversed by SelR/MsrB methionine sulfoxide reductases [PMID:22116028, PMID:27454820, PMID:24212093]. MICAL1 is maintained in an autoinhibited state by intramolecular interaction between its C-terminal coiled-coil domain and catalytic domain, and is activated by GTP-bound Rab GTPases (Rab8, Rab35), PAK1-mediated phosphorylation downstream of CDC42, and semaphorin–plexin–CRMP signaling [PMID:39532862, PMID:30242933, PMID:36198272, PMID:18305261]. Beyond actin, MICAL1 oxidizes CaMKII Met308 to restrain kinase activity and protect against cardiac arrhythmias, modulates Tau via Cys322 oxidation, and suppresses MST–NDR proapoptotic signaling; gain-of-function variants cause autosomal dominant lateral temporal lobe epilepsy (ADLTE) [PMID:32749237, PMID:35379354, PMID:21730291, PMID:29394500].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"The initial molecular identity of MICAL1 was established as a cytoplasmic protein associating with CasL and vimentin intermediate filaments, providing the first interaction partners but leaving enzymatic function unknown.\",\n      \"evidence\": \"Far Western screening and co-immunoprecipitation with domain mapping in human cells\",\n      \"pmids\": [\"11827972\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No enzymatic activity characterized\", \"Functional consequence of CasL/vimentin interactions not defined\", \"Single-lab study without independent replication\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Structural and enzymatic characterization revealed that MICAL1's N-terminal domain is an FAD-containing monooxygenase resembling p-hydroxybenzoate hydroxylase that consumes NADPH and generates H₂O₂, establishing it as a redox enzyme but leaving its physiological substrate unidentified.\",\n      \"evidence\": \"Two independent crystal structures (1.45 Å and 2.0 Å) plus in vitro NADPH oxidase kinetics\",\n      \"pmids\": [\"16275925\", \"16275926\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological protein substrate not identified\", \"Relationship to cytoskeletal function not established\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Discovery that MICAL is autoinhibited by its C-terminal domain and that semaphorin–plexin–CRMP signaling relieves this autoinhibition established how upstream guidance cues activate the enzyme, though the structural basis remained unclear.\",\n      \"evidence\": \"Co-immunoprecipitation of CRMP and Plexin with MICAL domains, enzyme activity assays with truncations\",\n      \"pmids\": [\"18305261\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model of full-length autoinhibited state\", \"Mechanism of autoinhibition release not resolved at atomic level\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"The breakthrough demonstration that MICAL directly binds and disassembles F-actin using its redox activity — and is necessary and sufficient for semaphorin-plexin cytoskeletal remodeling in vivo — identified actin as the physiological substrate.\",\n      \"evidence\": \"Purified-protein F-actin disassembly assay plus Drosophila genetic loss/gain-of-function\",\n      \"pmids\": [\"20148037\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific chemical modification on actin not yet identified\", \"Mechanism of filament destabilization unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identification of Met44 in actin's D-loop as the stereospecifically oxidized residue defined MICAL as a post-translational modifier of actin that simultaneously severs filaments and inhibits repolymerization, while a parallel study revealed MICAL1 suppresses NDR kinase–MST proapoptotic signaling through a distinct scaffolding interaction.\",\n      \"evidence\": \"In vitro biochemistry with site-specific modification analysis (actin); MS-based proteomics and co-IP with kinase assays (NDR)\",\n      \"pmids\": [\"22116028\", \"21730291\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Role of Met47 oxidation not characterized\", \"Structural basis of filament instability upon oxidation unknown\", \"Whether NDR regulation depends on redox activity unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Discovery that SelR/MsrB specifically reduces Mical-oxidized actin Met44-R-sulfoxide back to methionine established that MICAL-mediated actin modification is a reversible regulatory switch, not irreversible damage.\",\n      \"evidence\": \"Drosophila genetic screen, in vitro enzymatic reconstitution with purified SelR and Mical-oxidized actin\",\n      \"pmids\": [\"24212093\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Spatiotemporal regulation of SelR-MICAL balance in cells not characterized\", \"Whether additional reductases contribute is unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstration that MICAL-oxidized actin synergizes with cofilin — by increasing cofilin binding and overriding tropomyosin protection — revealed how two independent disassembly pathways converge for rapid F-actin destruction in vivo; kinetic characterization quantified the ~10-fold autoinhibition by the C-terminal domain.\",\n      \"evidence\": \"In vitro TIRF single-filament assays, Drosophila genetics, steady-state enzyme kinetics with truncation constructs\",\n      \"pmids\": [\"27454820\", \"26845023\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural mechanism of cofilin recognition of oxidized actin not resolved\", \"Regulation of MICAL1 versus MICAL2 activity in non-neuronal cells poorly defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Cryo-EM of Mical-oxidized actin filaments revealed how Met44 reorientation and a new Met47-O–Thr351 intermolecular bond destabilize intersubunit contacts, causing nucleotide-state-dependent catastrophic disassembly at ~84 subunits/s.\",\n      \"evidence\": \"3.9 Å cryo-EM of oxidized F-actin, single-filament TIRF, site-directed mutagenesis\",\n      \"pmids\": [\"29259197\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of MICAL bound to F-actin\", \"Whether oxidation affects actin-binding protein interactions beyond cofilin and fascin not fully explored\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Rab8-GTP was shown to bind and allosterically activate MICAL1 (4-fold kcat increase), defining a Rab-based activation mechanism; separately, ADLTE-associated MICAL1 variants were found to be gain-of-function, linking hyperactive actin oxidation to human epilepsy.\",\n      \"evidence\": \"Enzyme kinetics and SAXS for Rab8 activation; cell-based oxidoreductase and morphology assays for ADLTE variants\",\n      \"pmids\": [\"30242933\", \"29394500\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Rab8 binding relieves autoinhibition structurally was not resolved\", \"ADLTE mechanism in neurons not demonstrated in vivo\", \"ADLTE finding from a single family study with limited mechanistic depth\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"MICAL1 was established as a CaMKII regulator: stereospecific oxidation of CaMKII Met308 restrains kinase activity, and MICAL1 knockout mice develop lethal cardiac arrhythmias from CaMKII hyperactivation, demonstrating a non-actin substrate with major physiological consequences.\",\n      \"evidence\": \"Mouse knockout, in vitro biochemistry, human iPSC-derived cardiomyocytes, Drosophila genetics\",\n      \"pmids\": [\"32749237\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether additional MICAL1 substrates beyond actin and CaMKII exist is unknown\", \"Tissue-specific regulation of MICAL1 toward actin versus CaMKII not defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"PAK1 phosphorylation of MICAL1 on N-terminal serine residues (downstream of CDC42) was identified as an activation mechanism that accelerates F-actin disassembly, adding a kinase-dependent input alongside Rab-GTPase activation; separately, Mical was shown to oxidize Tau Cys322 to modulate tauopathy.\",\n      \"evidence\": \"Co-IP, MS phosphosite mapping, F-actin assays for PAK1; Drosophila genetics and MS for Tau oxidation\",\n      \"pmids\": [\"36198272\", \"35379354\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PAK1 and Rab activation are synergistic or independent is unknown\", \"Tau oxidation only shown in Drosophila model, human relevance unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Full-length cryo-EM structure at 3.1 Å finally resolved the autoinhibition mechanism: the C-terminal coiled-coil directly contacts the catalytic domain to block F-actin access, with CH-L2α1-LIM domains stabilizing this conformation; in parallel, MICAL1 was shown to disassemble branched actin at HIV-1 budding sites in a Rab35-dependent pathway enabling ESCRT recruitment.\",\n      \"evidence\": \"Cryo-EM of full-length human MICAL1 with biochemical validation; superresolution microscopy, siRNA/KO, in vitro branched-actin disassembly\",\n      \"pmids\": [\"39532862\", \"39556735\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of activated MICAL1 bound to F-actin or Rab\", \"How MICAL1 is spatially targeted to HIV budding sites beyond Rab35 is unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"MICAL1 was identified as a shear-activated actin regulator in platelets that promotes GPIb-IX-V translocation to lipid rafts for VWF binding, establishing a role in hemostasis and thrombus formation.\",\n      \"evidence\": \"MICAL1 knockout mice, live-cell imaging under shear, lipid raft fractionation, in vivo thrombus assay\",\n      \"pmids\": [\"40783397\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of shear-dependent MICAL1 activation is unknown\", \"Whether MICAL1 oxidizes platelet-specific substrates beyond actin is untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of MICAL1's interaction with F-actin in the activated state, how multiple activation inputs (Rab GTPases, PAK1 phosphorylation, plexin/CRMP) are integrated, the full scope of MICAL1's substrate repertoire beyond actin and CaMKII, and the pathogenic mechanism of MICAL1 gain-of-function in ADLTE at the neural circuit level.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of MICAL1-F-actin complex\", \"Integration of multiple activation pathways not studied\", \"Complete substrate repertoire undefined\", \"ADLTE circuit-level mechanism unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [0, 1, 3, 7, 8, 18]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [2, 6, 7, 21]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [3, 8, 25]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [12, 29]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [13, 14]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [2, 13, 28]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 15, 16]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [15, 16]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [12, 29]},\n      {\"term_id\": \"R-HSA-109582\", \"supporting_discovery_ids\": [23]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"CFL1\",\n      \"RAB8A\",\n      \"RAB35\",\n      \"PAK1\",\n      \"CRMP1\",\n      \"NDR1\",\n      \"ASAP1\",\n      \"PLXNA1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}