{"gene":"HEBP2","run_date":"2026-06-10T01:55:22","timeline":{"discoveries":[{"year":1999,"finding":"SOUL (ckSoul) was identified as a novel heme-binding protein expressed specifically in the retina and pineal gland of chicken, with sequence similarity to p22HBP (HEBP2 paralog), establishing SOUL/HBP as a new family of heme-binding proteins.","method":"Two-tissue suppression subtractive hybridization (SSH), sequence analysis, and database searches","journal":"Brain research. Molecular brain research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — identification via SSH and sequence homology; novel gene/family discovery with functional annotation but no direct biochemical reconstitution in this paper","pmids":["10640688"],"is_preprint":false},{"year":2004,"finding":"Mouse SOUL purifies as a dimer in the absence of heme but forms a hexamer upon heme binding, binding one heme per monomer. His42 is the axial ligand for Fe(III)-heme coordination (confirmed by His42Ala mutagenesis abolishing heme binding). Heme affinity (Kd ~4.8 nM) is distinct from that of p22HBP (Kd ~21 pM), and spectral properties (optical absorption, resonance Raman) differ between the two family members despite >40% sequence identity.","method":"Recombinant protein purification (E. coli), optical absorption spectroscopy, resonance Raman spectroscopy, site-directed mutagenesis (His42Ala), binding kinetics","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with mutagenesis and multiple orthogonal spectroscopic methods in a single rigorous study","pmids":["15518569"],"is_preprint":false},{"year":2006,"finding":"The first crystal/NMR structure of the SOUL/HBP family was determined for murine p22HBP (HEBP2 paralog), revealing a 9-stranded distorted beta-barrel flanked by two long alpha-helices. The tetrapyrrole binding site was localized by chemical shift mapping to a hydrophobic cleft formed by helix αA and an extended loop, with no specific axial ligand coordination of Fe(III)-heme.","method":"NMR structure determination, intrinsic protein fluorescence quenching for Kd measurement, chemical shift mapping","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR structure with functional binding-site mapping and Kd measurements in a single rigorous study","pmids":["16905545"],"is_preprint":false},{"year":2006,"finding":"HEBP2/SOUL sensitizes cells to necrotic cell death induced by A23187 and etoposide. In the presence of sub-threshold calcium, recombinant SOUL provokes mitochondrial permeability transition (mPT) in vitro, an effect inhibited by cyclosporine A (CsA). SOUL promotes necrotic (not apoptotic) death, and this effect is prevented by CsA, indicating SOUL induces necrosis via mPT induction.","method":"Cell viability assays (NIH3T3), in vitro mitochondrial permeability transition assay with recombinant SOUL protein, mitochondrial membrane potential monitoring, flow cytometry, cyclosporine A inhibition","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro reconstitution of mPT with recombinant protein plus in-cell validation, cyclosporine A rescue, and flow cytometry; single lab but multiple orthogonal methods","pmids":["17098234"],"is_preprint":false},{"year":2009,"finding":"Human SOUL (hSOUL, HEBP2) was successfully overexpressed, purified, and crystallized; crystals diffracted to 3.5 Å resolution in space group P6₄22 with one molecule per asymmetric unit. A preliminary 3D structure was obtained by molecular replacement using murine p22HBP structures.","method":"Recombinant protein overexpression and purification, X-ray crystallography, molecular replacement","journal":"Acta crystallographica. Section F, Structural biology and crystallization communications","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — preliminary structure at 3.5 Å, single lab, no functional validation reported in abstract","pmids":["19574650"],"is_preprint":false},{"year":2011,"finding":"SOUL contains a BH3 domain (residues 147–172) that interacts with the anti-apoptotic protein Bcl-xL. Crystal structures of SOUL alone and of the BH3 peptide–Bcl-xL complex were solved. The SOUL monomer is a single-domain distorted β-barrel with eight anti-parallel strands and two α-helices. Important structural differences exist in the BH3 domain between the intact SOUL molecule and when it is bound to Bcl-xL, indicating conformational change upon interaction.","method":"NMR spectroscopy, surface plasmon resonance (SPR), X-ray crystallography of SOUL alone and BH3 peptide–Bcl-xL complex","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structures plus NMR and SPR providing orthogonal evidence for the BH3–Bcl-xL interaction in a single rigorous study","pmids":["21639858"],"is_preprint":false},{"year":2017,"finding":"HEBP2 interacts with ALG-2 (apoptosis-linked gene 2), and their co-expression markedly increases the cytoplasmic pool of ALG-2 while altering subcellular distribution of HEBP2. Deregulation of the ALG-2/HEBP2 axis impairs spindle orientation and positioning during mitosis and modulates microtubule dynamic properties in cancer cells.","method":"Co-expression experiments, subcellular fractionation/immunofluorescence localization, mitotic spindle analysis, microtubule dynamics assays","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — co-localization and functional cell biology readouts (spindle, microtubule dynamics), single lab, multiple phenotypic analyses but interaction biochemistry details limited in abstract","pmids":["28004381"],"is_preprint":false},{"year":2018,"finding":"SOUL (HEBP2) interacts with ALG-2 in a Ca²⁺-dependent manner with 1:1 stoichiometry and high affinity (Kd = 32.4 nM, exothermic reaction). SOUL Phe100 and ALG-2 Trp57 are essential for this interaction (single-point mutations abolish heat change). A truncated SOUL mutant (residues 1–143) retains 1:1 binding to ALG-2 but via an endothermic reaction, indicating a second binding mode.","method":"Pulldown assay, isothermal titration calorimetry (ITC), site-directed mutagenesis of SOUL and ALG-2","journal":"International journal of molecular sciences","confidence":"High","confidence_rationale":"Tier 1 / Strong — ITC (thermodynamic characterization) combined with mutagenesis and pulldown assays, providing rigorous mechanistic detail on the interaction","pmids":["30501057"],"is_preprint":false},{"year":2024,"finding":"HEBP2 overexpression in MDA-MB-231 TNBC cells significantly enhanced cell viability in response to cisplatin and BCNU (DNA crosslinking agents) but not paclitaxel or MMS. CRISPR/Cas9-mediated HEBP2 knockout reduced viability specifically with cisplatin and BCNU but not paclitaxel or MMS. Exogenous HEBP2 rescue restored resistance to cisplatin and BCNU in knockout cells, establishing HEBP2 as a mediator of resistance to intrastrand/interstrand DNA crosslink-inducing agents.","method":"Overexpression and CRISPR/Cas9 knockout in MDA-MB-231 cells, cell viability assays with cisplatin, BCNU, MMS, paclitaxel, rescue experiment","journal":"Toxicological research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with rescue and agent-specific phenotypic readout; single lab but gain-of-function and loss-of-function with mechanistic specificity","pmids":["39345749"],"is_preprint":false},{"year":2025,"finding":"HEBP2 in tumor cells disrupts FOXA1 cytoplasmic phase separation, promoting FOXA1 nuclear translocation, which upregulates GSTP1 expression and increases glutamine consumption in TNBC cells. This metabolic competition for glutamine between HEBP2-high tumor cells and CCL3⁺ macrophages induces ferroptosis of macrophages, impairing antitumor immunity. A GSTP1 inhibitor sensitized TNBC to immunotherapy.","method":"Single-cell RNA sequencing, spatial transcriptomics, in vitro and in vivo functional experiments (GSTP1 inhibitor treatment), mechanistic studies of FOXA1 phase separation and nuclear translocation","journal":"Cell metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (scRNA-seq, spatial transcriptomics, in vitro/in vivo mechanistic assays) in a single study; novel pathway placement but abstract-level detail limits full assessment","pmids":["40992373"],"is_preprint":false}],"current_model":"HEBP2/SOUL is a cytosolic heme-binding protein that forms a hexamer upon heme binding (with His42 as the axial Fe-heme ligand), contains a BH3 domain that interacts with anti-apoptotic Bcl-xL, promotes necrotic cell death via mitochondrial permeability transition in a calcium-dependent manner, interacts with ALG-2 in a Ca²⁺-dependent manner (requiring Phe100 and modulating microtubule dynamics and spindle orientation), and in cancer cells drives glutamine competition with macrophages by disrupting FOXA1 phase separation to upregulate GSTP1, while also mediating resistance to DNA crosslinking chemotherapeutic agents."},"narrative":{"mechanistic_narrative":"HEBP2 (SOUL) is a heme-binding protein that couples heme sensing to cell-death and microtubule regulatory functions, and has emerged as a driver of chemoresistance and immune evasion in cancer [PMID:15518569, PMID:39345749, PMID:40992373]. Biochemically, SOUL purifies as a dimer in the absence of heme and assembles into a hexamer upon heme binding, coordinating one Fe(III)-heme per monomer through His42 as the axial ligand; its nanomolar heme affinity distinguishes it from its paralog p22HBP [PMID:15518569]. Structurally, the SOUL monomer is a single-domain distorted β-barrel flanked by α-helices, and it carries a BH3 domain (residues 147–172) that engages the anti-apoptotic protein Bcl-xL with an accompanying conformational change [PMID:21639858]. Functionally, SOUL sensitizes cells to necrotic death by provoking cyclosporine A-inhibitable mitochondrial permeability transition under sub-threshold calcium, acting via necrosis rather than apoptosis [PMID:17098234]. SOUL also binds ALG-2 in a Ca²⁺-dependent, 1:1, high-affinity manner that requires SOUL Phe100 and ALG-2 Trp57; through this axis it controls cytoplasmic ALG-2 distribution, microtubule dynamics, and mitotic spindle orientation in cancer cells [PMID:28004381, PMID:30501057]. In triple-negative breast cancer, HEBP2 mediates resistance to DNA crosslinking agents (cisplatin and BCNU) as shown by overexpression, CRISPR knockout, and rescue [PMID:39345749], and disrupts cytoplasmic FOXA1 phase separation to promote FOXA1 nuclear translocation and GSTP1 upregulation, driving glutamine competition that triggers macrophage ferroptosis and impairs antitumor immunity [PMID:40992373].","teleology":[{"year":1999,"claim":"Established the existence of a distinct heme-binding protein family by identifying SOUL as a tissue-restricted gene related to p22HBP, framing the question of whether SOUL is a genuine heme binder.","evidence":"Suppression subtractive hybridization and sequence analysis in chicken retina and pineal gland","pmids":["10640688"],"confidence":"Medium","gaps":["No direct biochemical demonstration of heme binding in this work","Function of the protein unknown","Restricted to identification by homology"]},{"year":2004,"claim":"Resolved how SOUL binds heme and how it differs from its paralog, defining His42 as the axial ligand and demonstrating heme-induced oligomerization.","evidence":"Recombinant mouse SOUL purification with optical/resonance Raman spectroscopy, His42Ala mutagenesis, and binding kinetics","pmids":["15518569"],"confidence":"High","gaps":["Physiological consequence of dimer-to-hexamer transition not established","Cellular heme source/sensing role undefined"]},{"year":2006,"claim":"Provided the structural framework for the family via the p22HBP fold and tetrapyrrole-binding cleft, distinguishing it from SOUL's His42-coordinated mode.","evidence":"NMR structure of murine p22HBP with chemical shift mapping and fluorescence Kd determination","pmids":["16905545"],"confidence":"High","gaps":["Structure is of the paralog, not SOUL itself","No axial coordination, unlike SOUL"]},{"year":2006,"claim":"Connected SOUL to cell-death regulation by showing it promotes necrosis through calcium-dependent mitochondrial permeability transition rather than apoptosis.","evidence":"Cell viability assays in NIH3T3, in vitro mPT reconstitution with recombinant SOUL, and cyclosporine A inhibition","pmids":["17098234"],"confidence":"High","gaps":["Molecular target of SOUL at the mitochondrion not identified","Link between heme binding and mPT induction unresolved"]},{"year":2009,"claim":"Advanced human SOUL toward structural characterization, confirming its fold relates to p22HBP.","evidence":"Recombinant human SOUL crystallization and molecular replacement at 3.5 Å","pmids":["19574650"],"confidence":"Medium","gaps":["Preliminary low-resolution structure","No functional readout"]},{"year":2011,"claim":"Identified a BH3 domain in SOUL and its physical interaction with Bcl-xL, placing SOUL within the apoptotic machinery via direct structural evidence.","evidence":"NMR, surface plasmon resonance, and crystal structures of SOUL alone and the BH3 peptide–Bcl-xL complex","pmids":["21639858"],"confidence":"High","gaps":["Cellular consequence of Bcl-xL engagement not demonstrated","Reconciliation with necrosis-promoting role unclear"]},{"year":2017,"claim":"Linked HEBP2 to cytoskeletal control by establishing the ALG-2/HEBP2 axis as a regulator of spindle orientation and microtubule dynamics.","evidence":"Co-expression, localization analysis, and spindle/microtubule dynamics assays in cancer cells","pmids":["28004381"],"confidence":"Medium","gaps":["Biochemical detail of interaction limited in this study","Mechanism linking ALG-2 binding to microtubule effects unresolved"]},{"year":2018,"claim":"Defined the thermodynamics and interface of the HEBP2–ALG-2 interaction, pinpointing Phe100 and Trp57 and revealing a second binding mode.","evidence":"Pulldown, isothermal titration calorimetry, and site-directed mutagenesis of SOUL and ALG-2","pmids":["30501057"],"confidence":"High","gaps":["Functional role of the endothermic second binding mode unknown","How Ca²⁺-dependent binding controls downstream microtubule effects not shown"]},{"year":2024,"claim":"Established HEBP2 as a causal mediator of resistance to DNA crosslinking chemotherapy with agent specificity.","evidence":"Overexpression, CRISPR/Cas9 knockout, and rescue with cisplatin, BCNU, MMS, and paclitaxel in MDA-MB-231 cells","pmids":["39345749"],"confidence":"Medium","gaps":["Molecular mechanism of crosslink resistance not defined","Connection to heme binding or known interactors unexplored"]},{"year":2025,"claim":"Placed HEBP2 in a tumor-immune metabolic pathway, showing it disrupts FOXA1 phase separation to upregulate GSTP1 and drive glutamine competition that causes macrophage ferroptosis.","evidence":"Single-cell RNA-seq, spatial transcriptomics, and in vitro/in vivo functional studies including GSTP1 inhibitor treatment in TNBC","pmids":["40992373"],"confidence":"Medium","gaps":["Direct biochemical mechanism by which HEBP2 disrupts FOXA1 condensates unresolved","Relationship to heme binding and other HEBP2 functions not connected"]},{"year":null,"claim":"How heme binding mechanistically integrates with HEBP2's diverse roles in necrosis, Bcl-xL engagement, microtubule regulation, chemoresistance, and FOXA1/GSTP1 signaling remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model linking the heme sensor function to downstream phenotypes","Whether the BH3/Bcl-xL, ALG-2, and FOXA1 activities operate in the same cells or contexts is unknown","Physiological (non-cancer) function in retina/pineal tissue uncharacterized in the corpus"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[1,2]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[6,7]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[6]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[3,5]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[8,9]}],"complexes":[],"partners":["BCL2L1","PDCD6","FOXA1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y5Z4","full_name":"Heme-binding protein 2","aliases":["Placental protein 23","PP23","Protein SOUL"],"length_aa":205,"mass_kda":22.9,"function":"Can promote mitochondrial permeability transition and facilitate necrotic cell death under different types of stress conditions","subcellular_location":"Cytoplasm; Mitochondrion","url":"https://www.uniprot.org/uniprotkb/Q9Y5Z4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/HEBP2","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"PDCD6","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/HEBP2","total_profiled":1310},"omim":[{"mim_id":"605825","title":"HEME-BINDING PROTEIN 2; HEBP2","url":"https://www.omim.org/entry/605825"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/HEBP2"},"hgnc":{"alias_symbol":["SOUL"],"prev_symbol":["C6orf34"]},"alphafold":{"accession":"Q9Y5Z4","domains":[{"cath_id":"3.20.80.10","chopping":"30-46_134-199","consensus_level":"medium","plddt":87.079,"start":30,"end":199},{"cath_id":"3.20.80.10","chopping":"47-133","consensus_level":"medium","plddt":95.6116,"start":47,"end":133}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y5Z4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y5Z4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y5Z4-F1-predicted_aligned_error_v6.png","plddt_mean":85.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=HEBP2","jax_strain_url":"https://www.jax.org/strain/search?query=HEBP2"},"sequence":{"accession":"Q9Y5Z4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y5Z4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y5Z4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y5Z4"}},"corpus_meta":[{"pmid":"20479029","id":"PMC_20479029","title":"The 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Molecular brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — identification via SSH and sequence homology; novel gene/family discovery with functional annotation but no direct biochemical reconstitution in this paper\",\n      \"pmids\": [\"10640688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Mouse SOUL purifies as a dimer in the absence of heme but forms a hexamer upon heme binding, binding one heme per monomer. His42 is the axial ligand for Fe(III)-heme coordination (confirmed by His42Ala mutagenesis abolishing heme binding). Heme affinity (Kd ~4.8 nM) is distinct from that of p22HBP (Kd ~21 pM), and spectral properties (optical absorption, resonance Raman) differ between the two family members despite >40% sequence identity.\",\n      \"method\": \"Recombinant protein purification (E. coli), optical absorption spectroscopy, resonance Raman spectroscopy, site-directed mutagenesis (His42Ala), binding kinetics\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with mutagenesis and multiple orthogonal spectroscopic methods in a single rigorous study\",\n      \"pmids\": [\"15518569\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The first crystal/NMR structure of the SOUL/HBP family was determined for murine p22HBP (HEBP2 paralog), revealing a 9-stranded distorted beta-barrel flanked by two long alpha-helices. The tetrapyrrole binding site was localized by chemical shift mapping to a hydrophobic cleft formed by helix αA and an extended loop, with no specific axial ligand coordination of Fe(III)-heme.\",\n      \"method\": \"NMR structure determination, intrinsic protein fluorescence quenching for Kd measurement, chemical shift mapping\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR structure with functional binding-site mapping and Kd measurements in a single rigorous study\",\n      \"pmids\": [\"16905545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"HEBP2/SOUL sensitizes cells to necrotic cell death induced by A23187 and etoposide. In the presence of sub-threshold calcium, recombinant SOUL provokes mitochondrial permeability transition (mPT) in vitro, an effect inhibited by cyclosporine A (CsA). SOUL promotes necrotic (not apoptotic) death, and this effect is prevented by CsA, indicating SOUL induces necrosis via mPT induction.\",\n      \"method\": \"Cell viability assays (NIH3T3), in vitro mitochondrial permeability transition assay with recombinant SOUL protein, mitochondrial membrane potential monitoring, flow cytometry, cyclosporine A inhibition\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro reconstitution of mPT with recombinant protein plus in-cell validation, cyclosporine A rescue, and flow cytometry; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"17098234\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Human SOUL (hSOUL, HEBP2) was successfully overexpressed, purified, and crystallized; crystals diffracted to 3.5 Å resolution in space group P6₄22 with one molecule per asymmetric unit. A preliminary 3D structure was obtained by molecular replacement using murine p22HBP structures.\",\n      \"method\": \"Recombinant protein overexpression and purification, X-ray crystallography, molecular replacement\",\n      \"journal\": \"Acta crystallographica. Section F, Structural biology and crystallization communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — preliminary structure at 3.5 Å, single lab, no functional validation reported in abstract\",\n      \"pmids\": [\"19574650\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SOUL contains a BH3 domain (residues 147–172) that interacts with the anti-apoptotic protein Bcl-xL. Crystal structures of SOUL alone and of the BH3 peptide–Bcl-xL complex were solved. The SOUL monomer is a single-domain distorted β-barrel with eight anti-parallel strands and two α-helices. Important structural differences exist in the BH3 domain between the intact SOUL molecule and when it is bound to Bcl-xL, indicating conformational change upon interaction.\",\n      \"method\": \"NMR spectroscopy, surface plasmon resonance (SPR), X-ray crystallography of SOUL alone and BH3 peptide–Bcl-xL complex\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structures plus NMR and SPR providing orthogonal evidence for the BH3–Bcl-xL interaction in a single rigorous study\",\n      \"pmids\": [\"21639858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"HEBP2 interacts with ALG-2 (apoptosis-linked gene 2), and their co-expression markedly increases the cytoplasmic pool of ALG-2 while altering subcellular distribution of HEBP2. Deregulation of the ALG-2/HEBP2 axis impairs spindle orientation and positioning during mitosis and modulates microtubule dynamic properties in cancer cells.\",\n      \"method\": \"Co-expression experiments, subcellular fractionation/immunofluorescence localization, mitotic spindle analysis, microtubule dynamics assays\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — co-localization and functional cell biology readouts (spindle, microtubule dynamics), single lab, multiple phenotypic analyses but interaction biochemistry details limited in abstract\",\n      \"pmids\": [\"28004381\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SOUL (HEBP2) interacts with ALG-2 in a Ca²⁺-dependent manner with 1:1 stoichiometry and high affinity (Kd = 32.4 nM, exothermic reaction). SOUL Phe100 and ALG-2 Trp57 are essential for this interaction (single-point mutations abolish heat change). A truncated SOUL mutant (residues 1–143) retains 1:1 binding to ALG-2 but via an endothermic reaction, indicating a second binding mode.\",\n      \"method\": \"Pulldown assay, isothermal titration calorimetry (ITC), site-directed mutagenesis of SOUL and ALG-2\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — ITC (thermodynamic characterization) combined with mutagenesis and pulldown assays, providing rigorous mechanistic detail on the interaction\",\n      \"pmids\": [\"30501057\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HEBP2 overexpression in MDA-MB-231 TNBC cells significantly enhanced cell viability in response to cisplatin and BCNU (DNA crosslinking agents) but not paclitaxel or MMS. CRISPR/Cas9-mediated HEBP2 knockout reduced viability specifically with cisplatin and BCNU but not paclitaxel or MMS. Exogenous HEBP2 rescue restored resistance to cisplatin and BCNU in knockout cells, establishing HEBP2 as a mediator of resistance to intrastrand/interstrand DNA crosslink-inducing agents.\",\n      \"method\": \"Overexpression and CRISPR/Cas9 knockout in MDA-MB-231 cells, cell viability assays with cisplatin, BCNU, MMS, paclitaxel, rescue experiment\",\n      \"journal\": \"Toxicological research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with rescue and agent-specific phenotypic readout; single lab but gain-of-function and loss-of-function with mechanistic specificity\",\n      \"pmids\": [\"39345749\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"HEBP2 in tumor cells disrupts FOXA1 cytoplasmic phase separation, promoting FOXA1 nuclear translocation, which upregulates GSTP1 expression and increases glutamine consumption in TNBC cells. This metabolic competition for glutamine between HEBP2-high tumor cells and CCL3⁺ macrophages induces ferroptosis of macrophages, impairing antitumor immunity. A GSTP1 inhibitor sensitized TNBC to immunotherapy.\",\n      \"method\": \"Single-cell RNA sequencing, spatial transcriptomics, in vitro and in vivo functional experiments (GSTP1 inhibitor treatment), mechanistic studies of FOXA1 phase separation and nuclear translocation\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (scRNA-seq, spatial transcriptomics, in vitro/in vivo mechanistic assays) in a single study; novel pathway placement but abstract-level detail limits full assessment\",\n      \"pmids\": [\"40992373\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"HEBP2/SOUL is a cytosolic heme-binding protein that forms a hexamer upon heme binding (with His42 as the axial Fe-heme ligand), contains a BH3 domain that interacts with anti-apoptotic Bcl-xL, promotes necrotic cell death via mitochondrial permeability transition in a calcium-dependent manner, interacts with ALG-2 in a Ca²⁺-dependent manner (requiring Phe100 and modulating microtubule dynamics and spindle orientation), and in cancer cells drives glutamine competition with macrophages by disrupting FOXA1 phase separation to upregulate GSTP1, while also mediating resistance to DNA crosslinking chemotherapeutic agents.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"HEBP2 (SOUL) is a heme-binding protein that couples heme sensing to cell-death and microtubule regulatory functions, and has emerged as a driver of chemoresistance and immune evasion in cancer [#1, #8, #9]. Biochemically, SOUL purifies as a dimer in the absence of heme and assembles into a hexamer upon heme binding, coordinating one Fe(III)-heme per monomer through His42 as the axial ligand; its nanomolar heme affinity distinguishes it from its paralog p22HBP [#1]. Structurally, the SOUL monomer is a single-domain distorted β-barrel flanked by α-helices, and it carries a BH3 domain (residues 147–172) that engages the anti-apoptotic protein Bcl-xL with an accompanying conformational change [#5]. Functionally, SOUL sensitizes cells to necrotic death by provoking cyclosporine A-inhibitable mitochondrial permeability transition under sub-threshold calcium, acting via necrosis rather than apoptosis [#3]. SOUL also binds ALG-2 in a Ca²⁺-dependent, 1:1, high-affinity manner that requires SOUL Phe100 and ALG-2 Trp57; through this axis it controls cytoplasmic ALG-2 distribution, microtubule dynamics, and mitotic spindle orientation in cancer cells [#6, #7]. In triple-negative breast cancer, HEBP2 mediates resistance to DNA crosslinking agents (cisplatin and BCNU) as shown by overexpression, CRISPR knockout, and rescue [#8], and disrupts cytoplasmic FOXA1 phase separation to promote FOXA1 nuclear translocation and GSTP1 upregulation, driving glutamine competition that triggers macrophage ferroptosis and impairs antitumor immunity [#9].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established the existence of a distinct heme-binding protein family by identifying SOUL as a tissue-restricted gene related to p22HBP, framing the question of whether SOUL is a genuine heme binder.\",\n      \"evidence\": \"Suppression subtractive hybridization and sequence analysis in chicken retina and pineal gland\",\n      \"pmids\": [\"10640688\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct biochemical demonstration of heme binding in this work\", \"Function of the protein unknown\", \"Restricted to identification by homology\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Resolved how SOUL binds heme and how it differs from its paralog, defining His42 as the axial ligand and demonstrating heme-induced oligomerization.\",\n      \"evidence\": \"Recombinant mouse SOUL purification with optical/resonance Raman spectroscopy, His42Ala mutagenesis, and binding kinetics\",\n      \"pmids\": [\"15518569\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological consequence of dimer-to-hexamer transition not established\", \"Cellular heme source/sensing role undefined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Provided the structural framework for the family via the p22HBP fold and tetrapyrrole-binding cleft, distinguishing it from SOUL's His42-coordinated mode.\",\n      \"evidence\": \"NMR structure of murine p22HBP with chemical shift mapping and fluorescence Kd determination\",\n      \"pmids\": [\"16905545\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure is of the paralog, not SOUL itself\", \"No axial coordination, unlike SOUL\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Connected SOUL to cell-death regulation by showing it promotes necrosis through calcium-dependent mitochondrial permeability transition rather than apoptosis.\",\n      \"evidence\": \"Cell viability assays in NIH3T3, in vitro mPT reconstitution with recombinant SOUL, and cyclosporine A inhibition\",\n      \"pmids\": [\"17098234\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular target of SOUL at the mitochondrion not identified\", \"Link between heme binding and mPT induction unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Advanced human SOUL toward structural characterization, confirming its fold relates to p22HBP.\",\n      \"evidence\": \"Recombinant human SOUL crystallization and molecular replacement at 3.5 Å\",\n      \"pmids\": [\"19574650\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preliminary low-resolution structure\", \"No functional readout\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified a BH3 domain in SOUL and its physical interaction with Bcl-xL, placing SOUL within the apoptotic machinery via direct structural evidence.\",\n      \"evidence\": \"NMR, surface plasmon resonance, and crystal structures of SOUL alone and the BH3 peptide–Bcl-xL complex\",\n      \"pmids\": [\"21639858\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular consequence of Bcl-xL engagement not demonstrated\", \"Reconciliation with necrosis-promoting role unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Linked HEBP2 to cytoskeletal control by establishing the ALG-2/HEBP2 axis as a regulator of spindle orientation and microtubule dynamics.\",\n      \"evidence\": \"Co-expression, localization analysis, and spindle/microtubule dynamics assays in cancer cells\",\n      \"pmids\": [\"28004381\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Biochemical detail of interaction limited in this study\", \"Mechanism linking ALG-2 binding to microtubule effects unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined the thermodynamics and interface of the HEBP2–ALG-2 interaction, pinpointing Phe100 and Trp57 and revealing a second binding mode.\",\n      \"evidence\": \"Pulldown, isothermal titration calorimetry, and site-directed mutagenesis of SOUL and ALG-2\",\n      \"pmids\": [\"30501057\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional role of the endothermic second binding mode unknown\", \"How Ca²⁺-dependent binding controls downstream microtubule effects not shown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established HEBP2 as a causal mediator of resistance to DNA crosslinking chemotherapy with agent specificity.\",\n      \"evidence\": \"Overexpression, CRISPR/Cas9 knockout, and rescue with cisplatin, BCNU, MMS, and paclitaxel in MDA-MB-231 cells\",\n      \"pmids\": [\"39345749\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism of crosslink resistance not defined\", \"Connection to heme binding or known interactors unexplored\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Placed HEBP2 in a tumor-immune metabolic pathway, showing it disrupts FOXA1 phase separation to upregulate GSTP1 and drive glutamine competition that causes macrophage ferroptosis.\",\n      \"evidence\": \"Single-cell RNA-seq, spatial transcriptomics, and in vitro/in vivo functional studies including GSTP1 inhibitor treatment in TNBC\",\n      \"pmids\": [\"40992373\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct biochemical mechanism by which HEBP2 disrupts FOXA1 condensates unresolved\", \"Relationship to heme binding and other HEBP2 functions not connected\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How heme binding mechanistically integrates with HEBP2's diverse roles in necrosis, Bcl-xL engagement, microtubule regulation, chemoresistance, and FOXA1/GSTP1 signaling remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model linking the heme sensor function to downstream phenotypes\", \"Whether the BH3/Bcl-xL, ALG-2, and FOXA1 activities operate in the same cells or contexts is unknown\", \"Physiological (non-cancer) function in retina/pineal tissue uncharacterized in the corpus\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [6, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [8, 9]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"BCL2L1\", \"PDCD6\", \"FOXA1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}