{"gene":"FES","run_date":"2026-04-28T17:46:03","timeline":{"discoveries":[{"year":1994,"finding":"The SH2 domain of fps/fes recognizes a specific phosphotyrosine motif: phospho-Tyr-hydrophilic-hydrophilic-hydrophobic, as determined by screening a degenerate phosphopeptide library. The fps/fes SH2 domain falls into group I (Phe/Tyr at beta D5 position), which defines this binding specificity.","method":"Degenerate phosphopeptide library screening","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 — in vitro biochemical assay with defined peptide library; replicated across multiple SH2 domains in same study with structural rationale","pmids":["7511210"],"is_preprint":false},{"year":1995,"finding":"FES/FPS tyrosine kinase directly phosphorylates BCR on tyrosine residues, forming a stable BCR-FES protein complex. Complex formation requires the SH2 domain of FES and a novel N-terminal binding domain (first 347 aa) of FES. Tyrosine phosphorylation of BCR by FES induces BCR association with GRB-2/SOS (the RAS guanine nucleotide exchange factor complex), linking FES to RAS signaling. Deletion of the BCR-binding N-terminal domain from v-fps abolished transforming activity.","method":"Co-expression in Sf-9 cells, co-immunoprecipitation, deletion mutagenesis, in vivo phosphorylation assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP, domain mapping by deletion mutagenesis, functional consequence (transformation) confirmed","pmids":["7529874"],"is_preprint":false},{"year":1996,"finding":"The kinase domain of v-fps (the activated avian homolog of fes) phosphorylates tyrosine-containing peptide substrates; rate-determining steps include both phosphoryl group transfer (~40–100 s⁻¹) and product release (~17–22 s⁻¹), with peptide substrates in rapid equilibrium with the enzyme.","method":"Viscosometric kinetic analysis, coupled enzyme assay, competitive inhibition studies with kinase domain fusion protein (GST-kin)","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro kinetic assay with mechanistic dissection of rate-limiting steps","pmids":["8634284"],"is_preprint":false},{"year":1998,"finding":"v-Fps (activated fes oncogene product) induces tyrosine phosphorylation of the PDGF beta receptor within minutes of kinase activation, requiring the kinase activity of v-Fps. Sustained v-Fps expression causes downregulation of PDGF receptor mRNA (~4–8-fold) and protein (>100-fold). Transformation requires both v-fps expression and a wild-type (kinase-active) PDGF receptor, indicating that constitutive PDGF receptor activation by v-Fps tyrosine phosphorylation drives the proliferative signal.","method":"Co-expression, immunoprecipitation, kinase-inactive mutants, soft agar colony formation assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — functional mutagenesis plus epistasis in cell system, single lab","pmids":["9620549"],"is_preprint":false},{"year":2002,"finding":"FES tyrosine kinase is present in the CRMP-CRAM complex and interacts with plexinA1 (PlexA1), phosphorylating PlexA1, CRAM, and CRMP2 on tyrosine residues. NP-1 (neuropilin-1) negatively regulates PlexA1 activation by FES under resting conditions. Semaphorin3A (Sema3A) enhances association of FES with PlexA1 and FES-mediated phosphorylation. Co-expression of FES with PlexA1 induces COS-7 cell contraction (active PlexA1 morphology), and kinase-negative FES mutants suppress Sema3A-induced growth cone collapse in DRG neurons.","method":"Co-immunoprecipitation, co-expression in COS-7 cells, kinase-negative dominant-negative mutants, DRG neuron growth cone collapse assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (co-IP, phosphorylation assay, cell morphology, neuron functional assay), moderate evidence","pmids":["12093729"],"is_preprint":false},{"year":2002,"finding":"fps/fes-null mice are more sensitive to lipopolysaccharide (LPS)-induced endotoxicity, confirming a role for Fps/Fes in regulating the innate immune response. Fps/Fes-null mice show slightly reduced bone marrow myeloid progenitors and circulating mature myeloid cells, indicating involvement but non-essentiality in myelopoiesis. These phenotypes were rescued by a fps/fes transgene. Bone marrow-derived Fps/Fes-null macrophages show no defects in GM-CSF-, IL-6-, or IL-3-induced Stat3/Stat5A activation, or LPS-induced IκB degradation, p38, Jnk, Erk, or Akt activation.","method":"Fps/fes knockout mouse (gene targeting), LPS challenge, transgene rescue, bone marrow macrophage signaling assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined phenotype, transgene rescue confirming specificity, multiple signaling pathway readouts","pmids":["11909942"],"is_preprint":false},{"year":2005,"finding":"Three of four somatic fps/fes mutations found in colorectal cancers result in kinase inactivation (not activation) of Fps/Fes, and fps/fes null or kinase-inactivating mutations accelerate tumor onset in a mouse breast epithelial cancer model, while a fps/fes transgene restores normal tumor onset kinetics, suggesting a tumor suppressor role for Fps/Fes in epithelial cells.","method":"Biochemical kinase activity assays of mutants, transgenic/knockout mouse breast cancer model, structural modeling","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 — functional kinase assays + in vivo mouse model with transgene rescue, moderate evidence","pmids":["15867340"],"is_preprint":false},{"year":2007,"finding":"FES is phosphorylated on tyrosine residues in cells carrying KIT(D816V) mutation in a KIT-dependent manner. RNAi-mediated reduction of FES expression decreases cell proliferation in human and murine cells harboring KIT(D816V) or KIT(D814Y), but not when the related fer gene is targeted. Reduced growth from FES knockdown is rescued by GM-CSF. Signaling downstream of KIT(D816V) is altered in FES-deficient cells, placing FES as an essential effector downstream of activated KIT.","method":"RNA interference knockdown, phosphotyrosine immunoblotting, cell proliferation assay, cytokine rescue, signaling pathway analysis","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — RNAi with specific rescue controls, pathway placement confirmed, paralog specificity demonstrated","pmids":["17595334"],"is_preprint":false},{"year":2012,"finding":"The N-terminal F-BAR and FX domains of FES/FER kinases regulate subcellular localization and kinase activation. FES kinase activity is enhanced upon ligand binding to its SH2 domain, which can lead to further phosphorylation of ligand-associated proteins. In mast cells, SH2 ligands of FES include the KIT receptor PTK and the high-affinity IgE receptor (FcεRI), triggering rapid FES activation and signaling to regulators of the actin cytoskeleton and membrane trafficking.","method":"Domain characterization, co-immunoprecipitation, kinase activity assays, mast cell signaling studies","journal":"Frontiers in bioscience (Landmark edition)","confidence":"Medium","confidence_rationale":"Tier 3 — review summarizing multiple findings; individual experiments cited but this is a review paper","pmids":["22201778"],"is_preprint":false},{"year":2022,"finding":"CRISPR-engineered monocytic cell lines with the 15q26.1 CAD risk genotype show reduced FES expression. siRNA-mediated knockdown of FES promotes migration of monocytes and vascular smooth muscle cells. Phosphoproteomics after FES knockdown revealed altered phosphorylation of proteins regulating cell migration. Fes knockout in apolipoprotein E-deficient mice fed a high-fat diet increased atherosclerotic plaque size and within-plaque monocyte/macrophage and smooth muscle cell content.","method":"CRISPR genome editing, siRNA knockdown, phosphoproteomics, single-cell RNA-seq, Fes knockout mouse atherosclerosis model","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (CRISPR editing, RNAi, phosphoproteomics, in vivo KO mouse), strong mechanistic evidence across cell and animal models","pmids":["36321446"],"is_preprint":false}],"current_model":"FES (Fps/Fes) is a non-receptor protein-tyrosine kinase that signals downstream of cytokine and growth factor receptors (including KIT and FcεRI) in myeloid/hematopoietic cells; it phosphorylates substrates such as BCR, PlexA1, CRMP2, and CRAM via its SH2 domain (which recognizes phospho-Tyr-hydrophilic-hydrophilic-hydrophobic motifs) and N-terminal domain interactions, coupling to RAS/GRB-2 signaling, semaphorin/plexin-mediated axon guidance, and actin cytoskeletal regulation, while also functioning as a tumor suppressor in epithelial cells and an inhibitor of monocyte/smooth muscle cell migration relevant to atherosclerosis."},"narrative":{"teleology":[{"year":1994,"claim":"Defining the substrate-recognition code of FES: the SH2 domain was shown to select a phospho-Tyr-hydrophilic-hydrophilic-hydrophobic motif, placing FES in group I SH2 domains and predicting its binding partners.","evidence":"Degenerate phosphopeptide library screening with recombinant SH2 domains","pmids":["7511210"],"confidence":"High","gaps":["No in vivo validation that the motif dictates physiological substrate selection","Contribution of non-SH2 domains to substrate recognition not addressed"]},{"year":1995,"claim":"Identification of BCR as a direct FES substrate linked FES kinase activity to RAS signaling: FES phosphorylates BCR via both its SH2 and a novel N-terminal domain, inducing BCR–GRB-2/SOS complex formation, and the N-terminal domain is required for v-fps transforming activity.","evidence":"Co-expression in Sf-9 cells, reciprocal co-immunoprecipitation, deletion mutagenesis, in vivo phosphorylation assays","pmids":["7529874"],"confidence":"High","gaps":["Whether endogenous FES-BCR interaction occurs at physiological expression levels","Downstream RAS pathway activation not directly measured"]},{"year":1996,"claim":"Kinetic dissection of the FES catalytic mechanism revealed that both phosphoryl group transfer and product release are rate-limiting, establishing that FES kinase operates via a rapid-equilibrium random mechanism.","evidence":"Viscosometric kinetic analysis and coupled enzyme assays with purified GST-kinase domain fusion protein","pmids":["8634284"],"confidence":"High","gaps":["Kinetics measured with peptide substrates; behavior with full-length protein substrates unknown","No structural basis for the dual rate-limiting steps"]},{"year":1998,"claim":"Activated v-Fps was shown to trans-phosphorylate and constitutively activate the PDGF-β receptor, requiring both v-Fps kinase activity and a functional PDGF receptor for cellular transformation, revealing a mechanism of receptor tyrosine kinase hijacking by an intracellular kinase.","evidence":"Co-expression, immunoprecipitation, kinase-inactive mutants, soft agar colony formation assay","pmids":["9620549"],"confidence":"Medium","gaps":["Relevance to wild-type (non-oncogenic) FES–PDGFR interaction unclear","Mechanism of initial FES–PDGFR physical association not defined","Single-lab observation"]},{"year":2002,"claim":"Two parallel studies established FES function in vivo: (1) in axon guidance, FES interacts with and phosphorylates plexinA1, CRAM, and CRMP2 downstream of semaphorin 3A, driving growth cone collapse; (2) Fes-null mice display heightened LPS sensitivity and modest myelopoietic defects rescuable by a transgene, placing FES as a regulator of innate immunity.","evidence":"Co-IP, COS-7 morphology assay, DRG neuron collapse assay (plexin study); gene-targeted knockout mice, LPS challenge, transgene rescue, macrophage signaling assays (innate immunity study)","pmids":["12093729","11909942"],"confidence":"High","gaps":["Identity of downstream phospho-targets mediating LPS sensitivity unknown","Neuropilin-1's inhibitory mechanism on FES–plexinA1 interaction is not molecularly resolved","No conditional KO to separate hematopoietic from non-hematopoietic phenotypes"]},{"year":2005,"claim":"The unexpected tumor suppressor role of FES was established: somatic colorectal cancer mutations inactivate rather than activate kinase activity, and loss of Fes accelerates breast tumor onset in a mouse model, with transgene rescue confirming specificity.","evidence":"Biochemical kinase assays of cancer-derived mutants, transgenic/knockout mouse mammary cancer model","pmids":["15867340"],"confidence":"High","gaps":["Downstream effectors mediating tumor suppression not identified","Whether FES tumor suppressor function is tissue-restricted beyond breast and colon is unknown"]},{"year":2007,"claim":"FES was identified as a required signaling effector downstream of oncogenic KIT(D816V): KIT phosphorylates FES, and FES knockdown specifically reduces proliferation of KIT-mutant cells, a phenotype not shared by the paralog FER.","evidence":"RNAi knockdown, phosphotyrosine immunoblotting, proliferation assay with GM-CSF rescue in human and murine cells","pmids":["17595334"],"confidence":"High","gaps":["Direct FES substrates mediating KIT-driven proliferation not identified","Therapeutic relevance of targeting FES in KIT-mutant malignancies not tested"]},{"year":2022,"claim":"FES was linked to atherosclerosis risk: the 15q26.1 CAD risk genotype reduces FES expression, FES loss promotes monocyte and smooth muscle cell migration through altered phosphorylation of migration-regulatory proteins, and Fes knockout in ApoE-null mice increases plaque size.","evidence":"CRISPR genome editing of risk locus, siRNA knockdown, phosphoproteomics, Fes knockout mouse atherosclerosis model","pmids":["36321446"],"confidence":"High","gaps":["Specific phospho-substrates causally responsible for migration phenotype not validated individually","Whether kinase activity versus scaffolding drives the anti-migratory function is unresolved"]},{"year":null,"claim":"The structural basis for FES autoinhibition and activation via its F-BAR/FX domains remains incompletely resolved, and the full repertoire of direct physiological substrates across tissues has not been systematically mapped.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution full-length FES structure available","Systematic substrate identification (e.g., analog-sensitive kinase approach) not performed","Conditional tissue-specific knockout studies are lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[1,2,3,4,7]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4,8]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5,9]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[4]}],"complexes":[],"partners":["BCR","PLXNA1","CRMP2","CRAM","KIT","GRB2","NRP1"],"other_free_text":[]},"mechanistic_narrative":"FES is a non-receptor protein-tyrosine kinase that transduces signals downstream of cytokine and growth factor receptors in myeloid, hematopoietic, and neuronal cells, functioning in innate immunity, myelopoiesis, semaphorin-mediated axon guidance, and suppression of cell migration and tumorigenesis. Its SH2 domain recognizes a phospho-Tyr-hydrophilic-hydrophilic-hydrophobic motif and, together with an N-terminal domain, mediates binding to substrates including BCR, plexinA1, CRMP2, and CRAM; phosphorylation of BCR couples FES to RAS/GRB-2 signaling, while phosphorylation of plexinA1 complex components drives semaphorin 3A-induced growth cone collapse [PMID:7511210, PMID:7529874, PMID:12093729]. FES is an essential effector downstream of oncogenic KIT (D816V) in mast cell neoplasia, and its kinase-inactivating somatic mutations accelerate epithelial tumor onset, establishing a context-dependent tumor suppressor role [PMID:17595334, PMID:15867340]. Loss of FES promotes monocyte and smooth muscle cell migration through altered phosphorylation of migration-regulatory proteins, and Fes-null mice on an ApoE-deficient background develop larger atherosclerotic plaques, linking FES to coronary artery disease risk at 15q26.1 [PMID:36321446]."},"prefetch_data":{"uniprot":{"accession":"P07332","full_name":"Tyrosine-protein kinase Fes/Fps","aliases":["Feline sarcoma/Fujinami avian sarcoma oncogene homolog","Proto-oncogene c-Fes","Proto-oncogene c-Fps","p93c-fes"],"length_aa":822,"mass_kda":93.5,"function":"Tyrosine-protein kinase that acts downstream of cell surface receptors and plays a role in the regulation of the actin cytoskeleton, microtubule assembly, cell attachment and cell spreading. Plays a role in FCER1 (high affinity immunoglobulin epsilon receptor)-mediated signaling in mast cells. Acts down-stream of the activated FCER1 receptor and the mast/stem cell growth factor receptor KIT. Plays a role in the regulation of mast cell degranulation. Plays a role in the regulation of cell differentiation and promotes neurite outgrowth in response to NGF signaling. Plays a role in cell scattering and cell migration in response to HGF-induced activation of EZR. Phosphorylates BCR and down-regulates BCR kinase activity. Phosphorylates HCLS1/HS1, PECAM1, STAT3 and TRIM28","subcellular_location":"Cytoplasm, cytosol; Cytoplasm, cytoskeleton; Cell membrane; Cytoplasmic vesicle; Golgi apparatus; Cell junction, focal adhesion","url":"https://www.uniprot.org/uniprotkb/P07332/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/FES","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/FES","total_profiled":1310},"omim":[{"mim_id":"617671","title":"HELIX SYNDROME; HELIX","url":"https://www.omim.org/entry/617671"},{"mim_id":"616046","title":"PROLINE/SERINE/THREONINE PHOSPHATASE-INTERACTING PROTEIN 2; PSTPIP2","url":"https://www.omim.org/entry/616046"},{"mim_id":"615595","title":"COMBINED OXIDATIVE PHOSPHORYLATION DEFICIENCY 19; COXPD19","url":"https://www.omim.org/entry/615595"},{"mim_id":"613438","title":"FCH DOMAIN ONLY PROTEIN 2; FCHO2","url":"https://www.omim.org/entry/613438"},{"mim_id":"613437","title":"FCH DOMAIN ONLY PROTEIN 1; FCHO1","url":"https://www.omim.org/entry/613437"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"},{"location":"Vesicles","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"bone marrow","ntpm":78.7},{"tissue":"lymphoid tissue","ntpm":110.0}],"url":"https://www.proteinatlas.org/search/FES"},"hgnc":{"alias_symbol":["FPS"],"prev_symbol":[]},"alphafold":{"accession":"P07332","domains":[{"cath_id":"1.20.1270.60","chopping":"135-233","consensus_level":"medium","plddt":93.9781,"start":135,"end":233},{"cath_id":"1.10.287.160","chopping":"300-344_355-388","consensus_level":"high","plddt":93.7239,"start":300,"end":388},{"cath_id":"3.30.505.10","chopping":"453-547","consensus_level":"high","plddt":93.6675,"start":453,"end":547},{"cath_id":"3.30.200.20","chopping":"552-638","consensus_level":"medium","plddt":93.7132,"start":552,"end":638},{"cath_id":"1.10.510.10","chopping":"642-822","consensus_level":"medium","plddt":94.5271,"start":642,"end":822}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P07332","model_url":"https://alphafold.ebi.ac.uk/files/AF-P07332-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P07332-F1-predicted_aligned_error_v6.png","plddt_mean":89.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=FES","jax_strain_url":"https://www.jax.org/strain/search?query=FES"},"sequence":{"accession":"P07332","fasta_url":"https://rest.uniprot.org/uniprotkb/P07332.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P07332/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P07332"}},"corpus_meta":[{"pmid":"7511210","id":"PMC_7511210","title":"Specific motifs recognized by the SH2 domains of Csk, 3BP2, fps/fes, GRB-2, HCP, SHC, Syk, and Vav.","date":"1994","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/7511210","citation_count":840,"is_preprint":false},{"pmid":"12947415","id":"PMC_12947415","title":"An interaction between frataxin and Isu1/Nfs1 that is crucial for Fe/S cluster synthesis on Isu1.","date":"2003","source":"EMBO reports","url":"https://pubmed.ncbi.nlm.nih.gov/12947415","citation_count":282,"is_preprint":false},{"pmid":"12732309","id":"PMC_12732309","title":"The role of Fe-S proteins in sensing and regulation in bacteria.","date":"2003","source":"Current opinion in microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/12732309","citation_count":280,"is_preprint":false},{"pmid":"18322036","id":"PMC_18322036","title":"Fe-S cluster assembly pathways in bacteria.","date":"2008","source":"Microbiology and molecular biology reviews : MMBR","url":"https://pubmed.ncbi.nlm.nih.gov/18322036","citation_count":259,"is_preprint":false},{"pmid":"20873749","id":"PMC_20873749","title":"Human frataxin is an allosteric switch that activates the Fe-S cluster biosynthetic complex.","date":"2010","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/20873749","citation_count":231,"is_preprint":false},{"pmid":"20404999","id":"PMC_20404999","title":"Structural basis for Fe-S cluster assembly and tRNA thiolation mediated by IscS protein-protein interactions.","date":"2010","source":"PLoS biology","url":"https://pubmed.ncbi.nlm.nih.gov/20404999","citation_count":216,"is_preprint":false},{"pmid":"11994747","id":"PMC_11994747","title":"Closing in on the biological functions of Fps/Fes and Fer.","date":"2002","source":"Nature reviews. 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enzymology","url":"https://pubmed.ncbi.nlm.nih.gov/28882200","citation_count":20,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":44122,"output_tokens":2866,"usd":0.087678},"stage2":{"model":"claude-opus-4-6","input_tokens":6199,"output_tokens":2331,"usd":0.133905},"total_usd":0.221583,"stage1_batch_id":"msgbatch_0118RScg3WGaGkaZRtWZbtce","stage2_batch_id":"msgbatch_01Cpfzvtbj42aqp5oYZ5Te2s","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1994,\n      \"finding\": \"The SH2 domain of fps/fes recognizes a specific phosphotyrosine motif: phospho-Tyr-hydrophilic-hydrophilic-hydrophobic, as determined by screening a degenerate phosphopeptide library. The fps/fes SH2 domain falls into group I (Phe/Tyr at beta D5 position), which defines this binding specificity.\",\n      \"method\": \"Degenerate phosphopeptide library screening\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro biochemical assay with defined peptide library; replicated across multiple SH2 domains in same study with structural rationale\",\n      \"pmids\": [\"7511210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"FES/FPS tyrosine kinase directly phosphorylates BCR on tyrosine residues, forming a stable BCR-FES protein complex. Complex formation requires the SH2 domain of FES and a novel N-terminal binding domain (first 347 aa) of FES. Tyrosine phosphorylation of BCR by FES induces BCR association with GRB-2/SOS (the RAS guanine nucleotide exchange factor complex), linking FES to RAS signaling. Deletion of the BCR-binding N-terminal domain from v-fps abolished transforming activity.\",\n      \"method\": \"Co-expression in Sf-9 cells, co-immunoprecipitation, deletion mutagenesis, in vivo phosphorylation assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP, domain mapping by deletion mutagenesis, functional consequence (transformation) confirmed\",\n      \"pmids\": [\"7529874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The kinase domain of v-fps (the activated avian homolog of fes) phosphorylates tyrosine-containing peptide substrates; rate-determining steps include both phosphoryl group transfer (~40–100 s⁻¹) and product release (~17–22 s⁻¹), with peptide substrates in rapid equilibrium with the enzyme.\",\n      \"method\": \"Viscosometric kinetic analysis, coupled enzyme assay, competitive inhibition studies with kinase domain fusion protein (GST-kin)\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro kinetic assay with mechanistic dissection of rate-limiting steps\",\n      \"pmids\": [\"8634284\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"v-Fps (activated fes oncogene product) induces tyrosine phosphorylation of the PDGF beta receptor within minutes of kinase activation, requiring the kinase activity of v-Fps. Sustained v-Fps expression causes downregulation of PDGF receptor mRNA (~4–8-fold) and protein (>100-fold). Transformation requires both v-fps expression and a wild-type (kinase-active) PDGF receptor, indicating that constitutive PDGF receptor activation by v-Fps tyrosine phosphorylation drives the proliferative signal.\",\n      \"method\": \"Co-expression, immunoprecipitation, kinase-inactive mutants, soft agar colony formation assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional mutagenesis plus epistasis in cell system, single lab\",\n      \"pmids\": [\"9620549\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"FES tyrosine kinase is present in the CRMP-CRAM complex and interacts with plexinA1 (PlexA1), phosphorylating PlexA1, CRAM, and CRMP2 on tyrosine residues. NP-1 (neuropilin-1) negatively regulates PlexA1 activation by FES under resting conditions. Semaphorin3A (Sema3A) enhances association of FES with PlexA1 and FES-mediated phosphorylation. Co-expression of FES with PlexA1 induces COS-7 cell contraction (active PlexA1 morphology), and kinase-negative FES mutants suppress Sema3A-induced growth cone collapse in DRG neurons.\",\n      \"method\": \"Co-immunoprecipitation, co-expression in COS-7 cells, kinase-negative dominant-negative mutants, DRG neuron growth cone collapse assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (co-IP, phosphorylation assay, cell morphology, neuron functional assay), moderate evidence\",\n      \"pmids\": [\"12093729\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"fps/fes-null mice are more sensitive to lipopolysaccharide (LPS)-induced endotoxicity, confirming a role for Fps/Fes in regulating the innate immune response. Fps/Fes-null mice show slightly reduced bone marrow myeloid progenitors and circulating mature myeloid cells, indicating involvement but non-essentiality in myelopoiesis. These phenotypes were rescued by a fps/fes transgene. Bone marrow-derived Fps/Fes-null macrophages show no defects in GM-CSF-, IL-6-, or IL-3-induced Stat3/Stat5A activation, or LPS-induced IκB degradation, p38, Jnk, Erk, or Akt activation.\",\n      \"method\": \"Fps/fes knockout mouse (gene targeting), LPS challenge, transgene rescue, bone marrow macrophage signaling assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined phenotype, transgene rescue confirming specificity, multiple signaling pathway readouts\",\n      \"pmids\": [\"11909942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Three of four somatic fps/fes mutations found in colorectal cancers result in kinase inactivation (not activation) of Fps/Fes, and fps/fes null or kinase-inactivating mutations accelerate tumor onset in a mouse breast epithelial cancer model, while a fps/fes transgene restores normal tumor onset kinetics, suggesting a tumor suppressor role for Fps/Fes in epithelial cells.\",\n      \"method\": \"Biochemical kinase activity assays of mutants, transgenic/knockout mouse breast cancer model, structural modeling\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — functional kinase assays + in vivo mouse model with transgene rescue, moderate evidence\",\n      \"pmids\": [\"15867340\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"FES is phosphorylated on tyrosine residues in cells carrying KIT(D816V) mutation in a KIT-dependent manner. RNAi-mediated reduction of FES expression decreases cell proliferation in human and murine cells harboring KIT(D816V) or KIT(D814Y), but not when the related fer gene is targeted. Reduced growth from FES knockdown is rescued by GM-CSF. Signaling downstream of KIT(D816V) is altered in FES-deficient cells, placing FES as an essential effector downstream of activated KIT.\",\n      \"method\": \"RNA interference knockdown, phosphotyrosine immunoblotting, cell proliferation assay, cytokine rescue, signaling pathway analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — RNAi with specific rescue controls, pathway placement confirmed, paralog specificity demonstrated\",\n      \"pmids\": [\"17595334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The N-terminal F-BAR and FX domains of FES/FER kinases regulate subcellular localization and kinase activation. FES kinase activity is enhanced upon ligand binding to its SH2 domain, which can lead to further phosphorylation of ligand-associated proteins. In mast cells, SH2 ligands of FES include the KIT receptor PTK and the high-affinity IgE receptor (FcεRI), triggering rapid FES activation and signaling to regulators of the actin cytoskeleton and membrane trafficking.\",\n      \"method\": \"Domain characterization, co-immunoprecipitation, kinase activity assays, mast cell signaling studies\",\n      \"journal\": \"Frontiers in bioscience (Landmark edition)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — review summarizing multiple findings; individual experiments cited but this is a review paper\",\n      \"pmids\": [\"22201778\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CRISPR-engineered monocytic cell lines with the 15q26.1 CAD risk genotype show reduced FES expression. siRNA-mediated knockdown of FES promotes migration of monocytes and vascular smooth muscle cells. Phosphoproteomics after FES knockdown revealed altered phosphorylation of proteins regulating cell migration. Fes knockout in apolipoprotein E-deficient mice fed a high-fat diet increased atherosclerotic plaque size and within-plaque monocyte/macrophage and smooth muscle cell content.\",\n      \"method\": \"CRISPR genome editing, siRNA knockdown, phosphoproteomics, single-cell RNA-seq, Fes knockout mouse atherosclerosis model\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (CRISPR editing, RNAi, phosphoproteomics, in vivo KO mouse), strong mechanistic evidence across cell and animal models\",\n      \"pmids\": [\"36321446\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FES (Fps/Fes) is a non-receptor protein-tyrosine kinase that signals downstream of cytokine and growth factor receptors (including KIT and FcεRI) in myeloid/hematopoietic cells; it phosphorylates substrates such as BCR, PlexA1, CRMP2, and CRAM via its SH2 domain (which recognizes phospho-Tyr-hydrophilic-hydrophilic-hydrophobic motifs) and N-terminal domain interactions, coupling to RAS/GRB-2 signaling, semaphorin/plexin-mediated axon guidance, and actin cytoskeletal regulation, while also functioning as a tumor suppressor in epithelial cells and an inhibitor of monocyte/smooth muscle cell migration relevant to atherosclerosis.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"FES is a non-receptor protein-tyrosine kinase that transduces signals downstream of cytokine and growth factor receptors in myeloid, hematopoietic, and neuronal cells, functioning in innate immunity, myelopoiesis, semaphorin-mediated axon guidance, and suppression of cell migration and tumorigenesis. Its SH2 domain recognizes a phospho-Tyr-hydrophilic-hydrophilic-hydrophobic motif and, together with an N-terminal domain, mediates binding to substrates including BCR, plexinA1, CRMP2, and CRAM; phosphorylation of BCR couples FES to RAS/GRB-2 signaling, while phosphorylation of plexinA1 complex components drives semaphorin 3A-induced growth cone collapse [PMID:7511210, PMID:7529874, PMID:12093729]. FES is an essential effector downstream of oncogenic KIT (D816V) in mast cell neoplasia, and its kinase-inactivating somatic mutations accelerate epithelial tumor onset, establishing a context-dependent tumor suppressor role [PMID:17595334, PMID:15867340]. Loss of FES promotes monocyte and smooth muscle cell migration through altered phosphorylation of migration-regulatory proteins, and Fes-null mice on an ApoE-deficient background develop larger atherosclerotic plaques, linking FES to coronary artery disease risk at 15q26.1 [PMID:36321446].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Defining the substrate-recognition code of FES: the SH2 domain was shown to select a phospho-Tyr-hydrophilic-hydrophilic-hydrophobic motif, placing FES in group I SH2 domains and predicting its binding partners.\",\n      \"evidence\": \"Degenerate phosphopeptide library screening with recombinant SH2 domains\",\n      \"pmids\": [\"7511210\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No in vivo validation that the motif dictates physiological substrate selection\", \"Contribution of non-SH2 domains to substrate recognition not addressed\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Identification of BCR as a direct FES substrate linked FES kinase activity to RAS signaling: FES phosphorylates BCR via both its SH2 and a novel N-terminal domain, inducing BCR–GRB-2/SOS complex formation, and the N-terminal domain is required for v-fps transforming activity.\",\n      \"evidence\": \"Co-expression in Sf-9 cells, reciprocal co-immunoprecipitation, deletion mutagenesis, in vivo phosphorylation assays\",\n      \"pmids\": [\"7529874\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether endogenous FES-BCR interaction occurs at physiological expression levels\", \"Downstream RAS pathway activation not directly measured\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Kinetic dissection of the FES catalytic mechanism revealed that both phosphoryl group transfer and product release are rate-limiting, establishing that FES kinase operates via a rapid-equilibrium random mechanism.\",\n      \"evidence\": \"Viscosometric kinetic analysis and coupled enzyme assays with purified GST-kinase domain fusion protein\",\n      \"pmids\": [\"8634284\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinetics measured with peptide substrates; behavior with full-length protein substrates unknown\", \"No structural basis for the dual rate-limiting steps\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Activated v-Fps was shown to trans-phosphorylate and constitutively activate the PDGF-β receptor, requiring both v-Fps kinase activity and a functional PDGF receptor for cellular transformation, revealing a mechanism of receptor tyrosine kinase hijacking by an intracellular kinase.\",\n      \"evidence\": \"Co-expression, immunoprecipitation, kinase-inactive mutants, soft agar colony formation assay\",\n      \"pmids\": [\"9620549\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relevance to wild-type (non-oncogenic) FES–PDGFR interaction unclear\", \"Mechanism of initial FES–PDGFR physical association not defined\", \"Single-lab observation\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Two parallel studies established FES function in vivo: (1) in axon guidance, FES interacts with and phosphorylates plexinA1, CRAM, and CRMP2 downstream of semaphorin 3A, driving growth cone collapse; (2) Fes-null mice display heightened LPS sensitivity and modest myelopoietic defects rescuable by a transgene, placing FES as a regulator of innate immunity.\",\n      \"evidence\": \"Co-IP, COS-7 morphology assay, DRG neuron collapse assay (plexin study); gene-targeted knockout mice, LPS challenge, transgene rescue, macrophage signaling assays (innate immunity study)\",\n      \"pmids\": [\"12093729\", \"11909942\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of downstream phospho-targets mediating LPS sensitivity unknown\", \"Neuropilin-1's inhibitory mechanism on FES–plexinA1 interaction is not molecularly resolved\", \"No conditional KO to separate hematopoietic from non-hematopoietic phenotypes\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"The unexpected tumor suppressor role of FES was established: somatic colorectal cancer mutations inactivate rather than activate kinase activity, and loss of Fes accelerates breast tumor onset in a mouse model, with transgene rescue confirming specificity.\",\n      \"evidence\": \"Biochemical kinase assays of cancer-derived mutants, transgenic/knockout mouse mammary cancer model\",\n      \"pmids\": [\"15867340\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream effectors mediating tumor suppression not identified\", \"Whether FES tumor suppressor function is tissue-restricted beyond breast and colon is unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"FES was identified as a required signaling effector downstream of oncogenic KIT(D816V): KIT phosphorylates FES, and FES knockdown specifically reduces proliferation of KIT-mutant cells, a phenotype not shared by the paralog FER.\",\n      \"evidence\": \"RNAi knockdown, phosphotyrosine immunoblotting, proliferation assay with GM-CSF rescue in human and murine cells\",\n      \"pmids\": [\"17595334\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct FES substrates mediating KIT-driven proliferation not identified\", \"Therapeutic relevance of targeting FES in KIT-mutant malignancies not tested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"FES was linked to atherosclerosis risk: the 15q26.1 CAD risk genotype reduces FES expression, FES loss promotes monocyte and smooth muscle cell migration through altered phosphorylation of migration-regulatory proteins, and Fes knockout in ApoE-null mice increases plaque size.\",\n      \"evidence\": \"CRISPR genome editing of risk locus, siRNA knockdown, phosphoproteomics, Fes knockout mouse atherosclerosis model\",\n      \"pmids\": [\"36321446\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific phospho-substrates causally responsible for migration phenotype not validated individually\", \"Whether kinase activity versus scaffolding drives the anti-migratory function is unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis for FES autoinhibition and activation via its F-BAR/FX domains remains incompletely resolved, and the full repertoire of direct physiological substrates across tissues has not been systematically mapped.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution full-length FES structure available\", \"Systematic substrate identification (e.g., analog-sensitive kinase approach) not performed\", \"Conditional tissue-specific knockout studies are lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [1, 2, 3, 4, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0162582\", \"supporting_discovery_ids\": [1, 3, 7, 8]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5, 9]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"BCR\", \"PLXNA1\", \"CRMP2\", \"CRAM\", \"KIT\", \"GRB2\", \"NRP1\"],\n    \"other_free_text\": []\n  }\n}\n```"}