{"gene":"BCL2L13","run_date":"2026-06-09T22:02:44","timeline":{"discoveries":[{"year":2001,"finding":"BCL2L13 (Bcl-rambo) localizes to mitochondria and induces apoptosis via its unique C-terminal membrane-anchored domain (not via its BH motifs). The cell death activity is specifically blocked by caspase inhibitors and IAPs, but not by Bcl-xL, FLIP, or FADD-DN. No interaction was detected with either anti-apoptotic (Bcl-2, Bcl-xL, Bcl-w, A1, MCL-1, E1B-19K, BHRF1) or pro-apoptotic (Bax, Bak, Bik, Bid, Bim, Bad) Bcl-2 family members.","method":"Overexpression in mammalian cells, subcellular fractionation/localization, domain deletion analysis, caspase/IAP inhibitor rescue assays, yeast two-hybrid/co-IP for interaction studies","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (localization, domain deletion, inhibitor rescue, interaction assays) in the founding paper, replicated in subsequent studies","pmids":["11262395"],"is_preprint":false},{"year":2003,"finding":"A splice variant of BCL2L13, Bcl-rambo beta, contains a 98 bp Alu-like insertion creating a premature stop codon, producing a BH4-only protein of 104 aa that lacks BH1/BH2/BH3 and the C-terminal membrane anchor. This cytosol-localized variant promotes etoposide- and Taxol-induced cell death; removal of the Alu sequence from Bcl-rambo beta abrogates its pro-apoptotic capability.","method":"Cloning and sequencing of splice variant, subcellular localization assay, domain deletion/mutagenesis, cell death assays with drug treatment","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — localization and functional domain deletion with two orthogonal readouts, single lab","pmids":["12527362"],"is_preprint":false},{"year":2014,"finding":"BCL2L13 binds to pro-apoptotic ceramide synthases CerS2 and CerS6 via its unique C-terminal 250-aa sequence (between BH and membrane anchor domains), blocking CerS2/6 homo- and heteromeric complex formation and their enzymatic activity, thereby inhibiting ceramide-induced apoptosis upstream of BAX activation and mitochondrial outer membrane permeabilization.","method":"Co-immunoprecipitation, in vitro ceramide synthase activity assay, domain deletion mapping, loss-of-function (siRNA/shRNA) in vitro and in vivo tumor growth assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — binding confirmed by Co-IP with domain mapping, enzymatic activity assay for CerS inhibition, in vivo functional validation; multiple orthogonal methods","pmids":["24706805"],"is_preprint":false},{"year":2015,"finding":"BCL2L13 functions as a mammalian homolog of yeast mitophagy receptor Atg32. Its BH domains are required for mitochondrial fragmentation, while its WXXL/LIR motif is required for mitophagy. BCL2L13 induces mitochondrial fragmentation and mitophagy independently of DNM1L/Drp1 and PARK2/Parkin, respectively, and can complement Atg32 deficiency in yeast.","method":"Overexpression and siRNA knockdown in HEK293 cells, domain mutagenesis (BH domain mutants, LIR motif mutants), mitophagy flux assays, cross-species complementation in atg32Δ yeast","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (mutagenesis, KD, yeast complementation), replicated by subsequent studies","pmids":["26506896"],"is_preprint":false},{"year":2015,"finding":"BCL2L13 controls caspase-3 activity and cytochrome C release in hippocampal neural stem/progenitor cells. miR-124 and miR-137 cooperatively target BCL2L13 to fine-tune its expression, thereby modulating non-apoptotic caspase-3 functions.","method":"Comparative proteomics, siRNA knockdown, caspase-3 activity assay, cytochrome C release assay, microRNA target validation","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD with defined biochemical readouts (caspase-3 activity, cytochrome C release), single lab with two orthogonal methods","pmids":["26207921"],"is_preprint":false},{"year":2016,"finding":"Human BCL2L13 localizes to mitochondria in Drosophila S2 cells and induces apoptosis (effector caspase activation) when overexpressed; this requires its C-terminal transmembrane domain. BCL2L13 genetically interacts with Drosophila adenine nucleotide translocators (ANT) and Atg8 (autophagy-related 8 protein) in vivo.","method":"Ectopic expression in Drosophila (GAL4-UAS system), immunofluorescence localization, caspase activity assay in eye imaginal discs, genetic epistasis/interaction screen, p35/DIAP rescue experiments","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple in vivo genetic epistasis experiments with defined phenotypic readouts, single organism model","pmids":["27348811"],"is_preprint":false},{"year":2018,"finding":"BCL2L13 promotes beige adipocyte biogenesis and browning of white adipose tissue. BCL2L13 disruption inhibits the browning program (reduced Prdm16, Ucp1, Dio2, Adrb3), through regulation of mitochondrial dynamics and biogenesis (decreased fission/fusion genes, PGC-1α, mitochondrial respiratory chain complexes), independently of autophagy activity.","method":"siRNA knockdown in preadipocytes, cold exposure and β3-adrenergic agonist treatment in vivo, qPCR/western blot for browning markers and mitochondrial dynamics genes","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined transcriptional and mitochondrial phenotypes, single lab","pmids":["30352689"],"is_preprint":false},{"year":2019,"finding":"BCL2L13 recruits the ULK1 complex to initiate mitophagy. The ULK1 complex (but not ULK1's yeast counterpart components for starvation autophagy) is required for BCL2L13-mediated mitophagy in mammalian cells. Interaction of LC3B with both ULK1 and BCL2L13 is important for this process.","method":"Yeast ATG mutant screening, mammalian cell ULK1 complex knockdown/knockout, co-immunoprecipitation of BCL2L13 with ULK1 complex components, mitophagy flux assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal interaction assays plus genetic epistasis in both yeast and mammalian systems, multiple orthogonal methods","pmids":["30625316"],"is_preprint":false},{"year":2019,"finding":"Human BCL2L13 binds to VDAC1 (and previously reported ANT1/ANT2) at the outer mitochondrial membrane. VDAC1 and VDAC2 cooperatively promote effector caspase activation when co-expressed with BCL2L13. BCL2L13 (with its LIR motif mutated W276A/I279A) still causes mitochondrial fragmentation and perinuclear accumulation of fragmented mitochondria; VDAC knockdown also promotes this perinuclear accumulation.","method":"Co-immunoprecipitation, Drosophila genetic screen, caspase activity assay in 293T cells, siRNA knockdown of VDACs, live cell imaging of mitochondrial morphology","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus Drosophila genetic interaction plus functional caspase assay, single lab","pmids":["31102594"],"is_preprint":false},{"year":2020,"finding":"BCL2L13 (Bcl-rambo) selectively binds LC3C, GABARAP, and GABARAPL1 over other LC3/GABARAP family members. The selectivity depends on residues at the X2 position of BCL2L13's LIR motif and the HP1/HP2 sites of the LC3/GABARAP proteins. Disrupting this selective binding alters mitophagy induction in cells.","method":"In vitro binding assays, bioinformatics, site-directed mutagenesis of LIR and HP1/HP2 sites, mitophagy assays in cells with mutant constructs","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro binding with mutagenesis and in-cell functional validation, single lab","pmids":["32828302"],"is_preprint":false},{"year":2022,"finding":"PGAM5 interacts with BCL2L13 (Bcl-rambo) via the BCL2L13 transmembrane domain. PGAM5 co-expression promotes BCL2L13-dependent effector caspase activity but interferes with BCL2L13-dependent mitophagy (decreases LC3B-II accumulation induced by BCL2L13). The genetic interaction was confirmed in Drosophila where pgam5-2 knockdown partially rescues BCL2L13-induced rough eye phenotype.","method":"Co-immunoprecipitation, Drosophila genetic screen and rescue, caspase activity assay, LC3B-II immunoblot, domain mapping","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mapping plus Drosophila epistasis plus dual functional readouts (caspase/mitophagy), single lab","pmids":["36075447"],"is_preprint":false},{"year":2023,"finding":"BCL2L13 interacts with GRP75 (mortalin/HSPA9) via its No-BH domain, as confirmed by co-immunoprecipitation and GST pull-down. GRP75 co-expression facilitates elevated executioner caspase activity and PARP-1 cleavage induced by BCL2L13, and GRP75 knockdown suppresses BCL2L13-dependent caspase activation and cytochrome c release. Genetic interaction confirmed in Drosophila.","method":"Co-immunoprecipitation, GST pull-down, domain mapping, siRNA knockdown, caspase activity assay, PARP-1 cleavage assay, cytochrome c release assay, Drosophila genetic epistasis","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — reciprocal biochemical binding assays (Co-IP + GST pulldown) plus domain mapping plus functional rescue and knockdown experiments plus in vivo genetic validation","pmids":["37640805"],"is_preprint":false},{"year":2023,"finding":"BCL2L13 promotes mitophagy through DNM1L (Drp1)-mediated mitochondrial fission in glioblastoma cells. BCL2L13 targets DNM1L at the Ser616 phosphorylation site, leading to mitochondrial fission and increased mitophagy flux, which promotes GBM cell proliferation and invasion.","method":"Overexpression and knockdown in GBM cell lines, phospho-DNM1L-Ser616 immunoblot, mitochondrial morphology assay, mitophagy flux assay, in vitro proliferation/invasion assays, in vivo xenograft","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional KD/OE with defined mechanistic readout (DNM1L Ser616 phosphorylation), single lab","pmids":["37660127"],"is_preprint":false},{"year":2023,"finding":"Knockout of Bcl2l13 in mice has a statistically robust effect on germline purifying selection against transmission of a pathogenic heteroplasmic mtDNA mutation (C5024T in tRNAAla), establishing BCL2L13-dependent mitophagy as a contributor to maternal mtDNA quality control.","method":"Mouse knockout genetics, heteroplasmy quantification across generations, comparison with Parkin KO, Ulk1 KO, and Ulk2 KO mouse models","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic knockout with quantitative heteroplasmy measurement, multiple control KO lines tested in parallel","pmids":["36608143"],"is_preprint":false},{"year":2024,"finding":"BCL2L13 is localized at mitochondria, ER, and mitochondria-associated membranes (MAMs) in mammalian cells. Loss of Bcl2l13 in zebrafish impairs skeletal muscle structure and function, alters cytosolic Ca2+ release and mitochondrial Ca2+ uptake, and decreases mitochondrial complex activity, without changing ER-mitochondria contact site number.","method":"Organelle fractionation, immunolocalization, zebrafish bcl2l13 knockout, calcium imaging, mitochondrial complex activity assay, siRNA knockdown in C2C12 cells","journal":"iScience","confidence":"High","confidence_rationale":"Tier 2 / Strong — organelle fractionation for localization plus in vivo KO with defined functional readouts plus in vitro KD, multiple orthogonal methods","pmids":["39175772"],"is_preprint":false},{"year":2024,"finding":"BCL2L13 interacts with LC3 to regulate receptor-mediated mitophagy in human saphenous vein endothelial cells during oxidative stress. o8G modification of miR-6513-5p causes it to lose targeted regulation of BCL2L13, contributing to BCL2L13 upregulation during oxidative stress.","method":"Proteomics, Co-IP of BCL2L13 with LC3, BCL2L13 knockdown/overexpression, mitophagy assays, miRNA target validation with o8G modification analysis","journal":"Advanced biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for BCL2L13-LC3 interaction plus functional mitophagy assays with KD, single lab","pmids":["39307929"],"is_preprint":false},{"year":2024,"finding":"BCL2L13 exclusively uses the FIP200/ULK1 complex (not the WIPI-ATG13 complex) to initiate autophagosome biogenesis for mitophagy, distinguishing it from BNIP3/NIX receptors which use WIPI-ATG13, and from FKBP8 and TEX264 which can use both pathways.","method":"Reconstitution of autophagy initiation with purified components, genetic epistasis in cells with FIP200/ULK1 vs WIPI-ATG13 pathway perturbations","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — reconstitution approach plus genetic epistasis, preprint not yet peer-reviewed","pmids":["bio_10.1101_2024.08.28.609967"],"is_preprint":true},{"year":2025,"finding":"PRKAA2 (AMPKα2) is the kinase responsible for phosphorylating BCL2L13 at Ser272, which is required for BCL2L13-mediated mitophagy activation in pressure-overloaded heart. bcl2l13 knockout and non-phosphorylatable BCL2L13-S272A knock-in mice show suppressed mitochondrial fission and mitophagy under pressure overload, leading to reduced ATP production. No additive effects were found in bcl2l13/prkn double knockout.","method":"Bcl2l13 knockout mice, knock-in mice (BCL2L13-S272A), transverse aortic constriction model, in vitro kinase assay identifying PRKAA2 as the kinase, mitophagy flux assays, ATP production measurement","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vivo KO and phospho-mutant knock-in mice with defined cardiac phenotype, in vitro kinase identification, multiple orthogonal methods","pmids":["39995141"],"is_preprint":false},{"year":2025,"finding":"BCL2L13 phosphorylation at Ser261 and Ser275 is induced by mitochondrial stress (CCCP) in an AMPK-dependent manner. TBK1, not ULK1, directly phosphorylates BCL2L13 at Ser275, revealing that BCL2L13 is uniquely regulated by both AMPK and innate immune stimuli among mitophagy receptors.","method":"Mass spectrometry phospho-mapping, phospho-specific antibody development, genetic studies with AMPK/ULK1/TBK1 knockout or inhibition, CCCP treatment","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — MS phospho-mapping with phospho-specific antibody validation and genetic kinase identification, preprint not yet peer-reviewed","pmids":["40672348"],"is_preprint":true},{"year":2026,"finding":"MAP2K6 (MKK6) directly phosphorylates BCL2L13 at Ser426, enhancing the interaction between BCL2L13 and LC3B and thereby promoting mitophagy, inhibiting oxidative phosphorylation, and suppressing tumor growth in lung adenocarcinoma. MKK6 localizes to mitochondria and autophagosome interaction sites, and its pro-mitophagy function requires kinase activity but not p38 signaling.","method":"In vitro kinase assay, Co-IP of BCL2L13-LC3B with phospho-mutant BCL2L13-S426, subcellular fractionation of MKK6, loss-of-function studies in LUAD cells, mitophagy flux assay, OXPHOS measurement, in vivo tumor growth","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro kinase assay identifying direct phosphorylation, site-specific mutagenesis of Ser426, functional interaction assay (BCL2L13-LC3B Co-IP), mitophagy and tumor growth readouts","pmids":["41886451"],"is_preprint":false},{"year":2026,"finding":"GDF15 secreted by Omicron-stimulated epithelial cells upregulates BCL2L13 in T cells, driving bystander T-cell apoptosis. Genetic dampening of BCL2L13 blunts Omicron-specific high-intensity bystander apoptosis, and recombinant GDF15 increases BCL2L13 expression and apoptosis.","method":"Recombinant GDF15 treatment, BCL2L13 genetic knockdown, apoptosis assays, co-culture experiments with Omicron-infected epithelial cells","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KD with functional apoptosis readout plus recombinant protein rescue, single lab","pmids":["41896204"],"is_preprint":false}],"current_model":"BCL2L13 (Bcl-rambo/MIL1) is an outer mitochondrial membrane protein with BH1-4 domains and a unique C-terminal extension that drives apoptosis via caspase activation (not through BH-domain interactions with other Bcl-2 family members); it also functions as a mitophagy receptor through its LIR motif, which selectively binds LC3C/GABARAP/GABARAPL1 and recruits the FIP200/ULK1 complex to initiate mitophagy; its mitophagy activity is activated by phosphorylation at Ser272/Ser275/Ser426 by PRKAA2/AMPKα2, TBK1, and MKK6, respectively; it inhibits ceramide synthases CerS2/6 via its C-terminal insert domain; interacts with VDAC1/2, ANT1/2, GRP75, and PGAM5 to modulate apoptosis and mitophagy; regulates mitochondrial fission via DNM1L; contributes to germline mtDNA purifying selection; and localizes to MAMs where it regulates ER-mitochondria calcium signaling in skeletal muscle."},"narrative":{"mechanistic_narrative":"BCL2L13 (Bcl-rambo/MIL1) is an outer mitochondrial membrane protein of the Bcl-2 family that operates two distinct effector programs—apoptosis and mitophagy—through structurally separable modules [PMID:11262395, PMID:26506896]. Its pro-apoptotic activity is driven not by canonical BH-domain interactions with other Bcl-2 family members, which it does not engage, but by its unique C-terminal membrane-anchored domain, and the resulting cell death is caspase-dependent and blocked by IAPs [PMID:11262395]. This caspase-activating function is amplified by physical partners at the outer membrane and intermembrane space: VDAC1/2 cooperatively promote effector caspase activation, PGAM5 binds the transmembrane domain to favor caspase activity over mitophagy, and GRP75/mortalin binds the No-BH domain to facilitate executioner caspase activation, PARP-1 cleavage, and cytochrome c release [PMID:31102594, PMID:36075447, PMID:37640805]. Independently of apoptosis, BCL2L13 acts as a mammalian functional analog of the yeast mitophagy receptor Atg32, using its BH domains for mitochondrial fragmentation and its WXXL/LIR motif for mitophagy, and complementing atg32Δ yeast [PMID:26506896]. The LIR motif selectively engages LC3C, GABARAP, and GABARAPL1 and recruits the FIP200/ULK1 complex to nucleate autophagosome biogenesis, operating independently of Parkin and, for fragmentation, of DNM1L [PMID:26506896, PMID:30625316, PMID:32828302]. Its mitophagy activity is switched on by phosphorylation: PRKAA2/AMPKα2 phosphorylates Ser272 to drive mitophagy in pressure-overloaded heart, TBK1 phosphorylates Ser275 under mitochondrial stress, and MAP2K6/MKK6 phosphorylates Ser426 to strengthen the BCL2L13–LC3B interaction [PMID:39995141, PMID:40672348, PMID:41886451]. Through its C-terminal insert BCL2L13 also binds and inhibits ceramide synthases CerS2/CerS6, blocking ceramide-induced apoptosis upstream of BAX [PMID:24706805]. Physiologically, BCL2L13 contributes to germline purifying selection against pathogenic heteroplasmic mtDNA [PMID:36608143] and localizes to mitochondria-associated membranes where it shapes ER–mitochondria calcium signaling and mitochondrial complex activity in skeletal muscle [PMID:39175772].","teleology":[{"year":2001,"claim":"Established that BCL2L13 is a mitochondrial Bcl-2 family member whose death activity is mechanistically unusual—driven by its C-terminal anchor and caspases rather than BH-domain heterodimerization.","evidence":"Overexpression, subcellular fractionation, domain deletion, and caspase/IAP inhibitor rescue in mammalian cells, plus interaction screens against Bcl-2 family members","pmids":["11262395"],"confidence":"High","gaps":["Did not identify the caspase activation pathway or direct molecular partners","Mechanism by which the C-terminal domain triggers death left unresolved"]},{"year":2003,"claim":"Showed a splice variant generates a cytosolic BH4-only protein, indicating isoform-dependent control of BCL2L13 pro-apoptotic output.","evidence":"Cloning/sequencing of Bcl-rambo beta, localization, mutagenesis removing the Alu insert, and drug-induced cell death assays","pmids":["12527362"],"confidence":"Medium","gaps":["Single lab; physiological abundance of the variant unknown","Mechanism by which the cytosolic variant promotes death not defined"]},{"year":2014,"claim":"Identified a non-canonical anti-apoptotic role: BCL2L13 inhibits ceramide synthases CerS2/6 via its C-terminal insert, blocking ceramide-driven apoptosis upstream of BAX.","evidence":"Co-IP with domain mapping, in vitro ceramide synthase activity assays, siRNA loss-of-function, and in vivo tumor growth","pmids":["24706805"],"confidence":"High","gaps":["How the same protein reconciles pro- and anti-apoptotic activities not resolved","No structural basis for CerS binding"]},{"year":2015,"claim":"Defined BCL2L13 as a mammalian mitophagy receptor functionally equivalent to yeast Atg32, with separable domains for fragmentation versus mitophagy.","evidence":"Domain mutagenesis (BH and LIR mutants), knockdown, mitophagy flux assays, and cross-species complementation in atg32Δ yeast","pmids":["26506896"],"confidence":"High","gaps":["Did not identify the downstream autophagy machinery recruited","Physiological mitophagy contexts not established"]},{"year":2015,"claim":"Linked BCL2L13 to non-apoptotic caspase regulation in neural progenitors under microRNA control.","evidence":"Proteomics, siRNA knockdown, caspase-3 and cytochrome c release assays, and miR-124/miR-137 target validation","pmids":["26207921"],"confidence":"Medium","gaps":["Single lab","Direct molecular mechanism connecting BCL2L13 to caspase-3 control not defined"]},{"year":2019,"claim":"Resolved the autophagy initiation machinery, showing BCL2L13 recruits the ULK1 complex with LC3B bridging BCL2L13 and ULK1.","evidence":"Yeast ATG mutant screening, mammalian ULK1 complex knockout, reciprocal Co-IP, and mitophagy flux assays","pmids":["30625316"],"confidence":"High","gaps":["Selectivity among ATG8 family members not yet defined here","How recruitment is regulated upstream unknown"]},{"year":2019,"claim":"Defined VDAC1/2 as outer-membrane partners that cooperatively amplify BCL2L13-driven caspase activation, separating the apoptotic and morphological roles.","evidence":"Co-IP, Drosophila genetic screen, caspase assays, VDAC siRNA, and live-cell mitochondrial imaging","pmids":["31102594"],"confidence":"Medium","gaps":["Single lab","Direct vs indirect nature of VDAC contribution to caspase activation unclear"]},{"year":2020,"claim":"Established the structural basis of ATG8 selectivity, showing BCL2L13's LIR selectively binds LC3C/GABARAP/GABARAPL1.","evidence":"In vitro binding assays, LIR X2 and HP1/HP2 mutagenesis, and mitophagy assays in cells","pmids":["32828302"],"confidence":"Medium","gaps":["Single lab","Functional consequence of selectivity in vivo not established"]},{"year":2022,"claim":"Showed PGAM5 binds the transmembrane domain to bias BCL2L13 toward caspase activation and away from mitophagy, revealing a partner-controlled switch between its two programs.","evidence":"Co-IP with domain mapping, Drosophila epistasis/rescue, caspase assays, and LC3B-II immunoblot","pmids":["36075447"],"confidence":"Medium","gaps":["Single lab","Mechanism by which PGAM5 toggles output not biochemically defined"]},{"year":2023,"claim":"Identified GRP75/mortalin as a No-BH-domain partner that potentiates executioner caspase activation and cytochrome c release.","evidence":"Co-IP and GST pull-down with domain mapping, siRNA knockdown, caspase/PARP-1/cytochrome c assays, and Drosophila epistasis","pmids":["37640805"],"confidence":"High","gaps":["How GRP75 binding couples to caspase machinery not resolved"]},{"year":2023,"claim":"Connected BCL2L13 to DNM1L-mediated fission in cancer, with targeting of DNM1L Ser616 promoting mitophagy and tumor cell aggression.","evidence":"OE/KD in GBM cells, phospho-DNM1L-Ser616 immunoblot, mitochondrial morphology and mitophagy flux, and xenografts","pmids":["37660127"],"confidence":"Medium","gaps":["Single lab; reconciles incompletely with prior DNM1L-independent fragmentation report","Whether BCL2L13 directly modifies DNM1L unclear"]},{"year":2023,"claim":"Demonstrated an in vivo physiological role: BCL2L13-dependent mitophagy contributes to germline purifying selection against pathogenic mtDNA.","evidence":"Mouse Bcl2l13 knockout with heteroplasmy quantification across generations, benchmarked against Parkin/Ulk1/Ulk2 KO lines","pmids":["36608143"],"confidence":"High","gaps":["Cell-type and developmental window of selection not defined","Relative contribution versus other receptors not quantified"]},{"year":2024,"claim":"Placed BCL2L13 at MAMs and assigned a calcium-handling and bioenergetic role in skeletal muscle.","evidence":"Organelle fractionation, immunolocalization, zebrafish bcl2l13 knockout, calcium imaging, complex activity assays, and C2C12 knockdown","pmids":["39175772"],"confidence":"High","gaps":["Molecular mechanism linking BCL2L13 to Ca2+ flux unknown","Relationship between MAM localization and mitophagy not established"]},{"year":2024,"claim":"Showed BCL2L13-LC3 receptor mitophagy operates in endothelial oxidative stress under microRNA control.","evidence":"Proteomics, BCL2L13-LC3 Co-IP, KD/OE mitophagy assays, and o8G-modified miR-6513-5p target analysis","pmids":["39307929"],"confidence":"Medium","gaps":["Single lab","Direct contribution of BCL2L13 to endothelial protection not isolated"]},{"year":2025,"claim":"Identified PRKAA2/AMPKα2 as the kinase phosphorylating Ser272 to activate cardiac mitophagy, with phospho-mutant knock-in mice confirming functional requirement.","evidence":"Bcl2l13 KO and BCL2L13-S272A knock-in mice, transverse aortic constriction, in vitro kinase assay, mitophagy flux, and ATP measurement","pmids":["39995141"],"confidence":"High","gaps":["How Ser272 phosphorylation activates the receptor structurally unknown","Interplay with other phospho-sites not addressed"]},{"year":2026,"claim":"Defined MAP2K6/MKK6 phosphorylation of Ser426 as a switch strengthening BCL2L13-LC3B binding and suppressing tumor growth via mitophagy.","evidence":"In vitro kinase assay, BCL2L13-S426 mutant Co-IP, MKK6 fractionation, LUAD loss-of-function, mitophagy/OXPHOS readouts, and tumor growth","pmids":["41886451"],"confidence":"High","gaps":["How three distinct kinases coordinate distinct phospho-sites unresolved","Context determining which kinase dominates unknown"]},{"year":2026,"claim":"Linked GDF15 signaling to BCL2L13 induction driving bystander T-cell apoptosis in viral infection.","evidence":"Recombinant GDF15 treatment, BCL2L13 knockdown, apoptosis assays, and co-culture with Omicron-infected epithelial cells","pmids":["41896204"],"confidence":"Medium","gaps":["Single lab","Signaling intermediate between GDF15 and BCL2L13 transcription unknown"]},{"year":null,"claim":"How BCL2L13 partitions between its pro-apoptotic and pro-mitophagic programs—and how partner binding, isoform choice, and multi-kinase phosphorylation are integrated into a single decision—remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of full-length BCL2L13 or its domain switch","Hierarchy and crosstalk among AMPK/TBK1/MKK6 phospho-sites undefined","Mechanism coupling MAM calcium signaling to mitophagy unestablished"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,7,9]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,8,11]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,3,14]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[14]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1]}],"pathway":[{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[3,7,16]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[0,8,11]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[13,14]}],"complexes":["FIP200/ULK1 complex"],"partners":["VDAC1","VDAC2","PGAM5","HSPA9","MAP3K6","MAP2K6","CERS2","CERS6"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9BXK5","full_name":"Bcl-2-like protein 13","aliases":["Bcl-rambo","Protein Mil1"],"length_aa":485,"mass_kda":52.7,"function":"May promote the activation of caspase-3 and apoptosis","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9BXK5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/BCL2L13","classification":"Not Classified","n_dependent_lines":8,"n_total_lines":1208,"dependency_fraction":0.006622516556291391},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/BCL2L13","total_profiled":1310},"omim":[{"mim_id":"619822","title":"BCL2-LIKE 13; BCL2L13","url":"https://www.omim.org/entry/619822"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Mitochondria","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/BCL2L13"},"hgnc":{"alias_symbol":["MIL1","BCL-RAMBO"],"prev_symbol":[]},"alphafold":{"accession":"Q9BXK5","domains":[{"cath_id":"1.10.437","chopping":"10-38_46-206","consensus_level":"high","plddt":90.6585,"start":10,"end":206}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BXK5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BXK5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9BXK5-F1-predicted_aligned_error_v6.png","plddt_mean":64.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=BCL2L13","jax_strain_url":"https://www.jax.org/strain/search?query=BCL2L13"},"sequence":{"accession":"Q9BXK5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9BXK5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9BXK5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9BXK5"}},"corpus_meta":[{"pmid":"11262395","id":"PMC_11262395","title":"Bcl-rambo, a 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The cell death activity is specifically blocked by caspase inhibitors and IAPs, but not by Bcl-xL, FLIP, or FADD-DN. No interaction was detected with either anti-apoptotic (Bcl-2, Bcl-xL, Bcl-w, A1, MCL-1, E1B-19K, BHRF1) or pro-apoptotic (Bax, Bak, Bik, Bid, Bim, Bad) Bcl-2 family members.\",\n      \"method\": \"Overexpression in mammalian cells, subcellular fractionation/localization, domain deletion analysis, caspase/IAP inhibitor rescue assays, yeast two-hybrid/co-IP for interaction studies\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (localization, domain deletion, inhibitor rescue, interaction assays) in the founding paper, replicated in subsequent studies\",\n      \"pmids\": [\"11262395\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"A splice variant of BCL2L13, Bcl-rambo beta, contains a 98 bp Alu-like insertion creating a premature stop codon, producing a BH4-only protein of 104 aa that lacks BH1/BH2/BH3 and the C-terminal membrane anchor. This cytosol-localized variant promotes etoposide- and Taxol-induced cell death; removal of the Alu sequence from Bcl-rambo beta abrogates its pro-apoptotic capability.\",\n      \"method\": \"Cloning and sequencing of splice variant, subcellular localization assay, domain deletion/mutagenesis, cell death assays with drug treatment\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — localization and functional domain deletion with two orthogonal readouts, single lab\",\n      \"pmids\": [\"12527362\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"BCL2L13 binds to pro-apoptotic ceramide synthases CerS2 and CerS6 via its unique C-terminal 250-aa sequence (between BH and membrane anchor domains), blocking CerS2/6 homo- and heteromeric complex formation and their enzymatic activity, thereby inhibiting ceramide-induced apoptosis upstream of BAX activation and mitochondrial outer membrane permeabilization.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ceramide synthase activity assay, domain deletion mapping, loss-of-function (siRNA/shRNA) in vitro and in vivo tumor growth assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — binding confirmed by Co-IP with domain mapping, enzymatic activity assay for CerS inhibition, in vivo functional validation; multiple orthogonal methods\",\n      \"pmids\": [\"24706805\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"BCL2L13 functions as a mammalian homolog of yeast mitophagy receptor Atg32. Its BH domains are required for mitochondrial fragmentation, while its WXXL/LIR motif is required for mitophagy. BCL2L13 induces mitochondrial fragmentation and mitophagy independently of DNM1L/Drp1 and PARK2/Parkin, respectively, and can complement Atg32 deficiency in yeast.\",\n      \"method\": \"Overexpression and siRNA knockdown in HEK293 cells, domain mutagenesis (BH domain mutants, LIR motif mutants), mitophagy flux assays, cross-species complementation in atg32Δ yeast\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (mutagenesis, KD, yeast complementation), replicated by subsequent studies\",\n      \"pmids\": [\"26506896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"BCL2L13 controls caspase-3 activity and cytochrome C release in hippocampal neural stem/progenitor cells. miR-124 and miR-137 cooperatively target BCL2L13 to fine-tune its expression, thereby modulating non-apoptotic caspase-3 functions.\",\n      \"method\": \"Comparative proteomics, siRNA knockdown, caspase-3 activity assay, cytochrome C release assay, microRNA target validation\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD with defined biochemical readouts (caspase-3 activity, cytochrome C release), single lab with two orthogonal methods\",\n      \"pmids\": [\"26207921\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Human BCL2L13 localizes to mitochondria in Drosophila S2 cells and induces apoptosis (effector caspase activation) when overexpressed; this requires its C-terminal transmembrane domain. BCL2L13 genetically interacts with Drosophila adenine nucleotide translocators (ANT) and Atg8 (autophagy-related 8 protein) in vivo.\",\n      \"method\": \"Ectopic expression in Drosophila (GAL4-UAS system), immunofluorescence localization, caspase activity assay in eye imaginal discs, genetic epistasis/interaction screen, p35/DIAP rescue experiments\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple in vivo genetic epistasis experiments with defined phenotypic readouts, single organism model\",\n      \"pmids\": [\"27348811\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"BCL2L13 promotes beige adipocyte biogenesis and browning of white adipose tissue. BCL2L13 disruption inhibits the browning program (reduced Prdm16, Ucp1, Dio2, Adrb3), through regulation of mitochondrial dynamics and biogenesis (decreased fission/fusion genes, PGC-1α, mitochondrial respiratory chain complexes), independently of autophagy activity.\",\n      \"method\": \"siRNA knockdown in preadipocytes, cold exposure and β3-adrenergic agonist treatment in vivo, qPCR/western blot for browning markers and mitochondrial dynamics genes\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined transcriptional and mitochondrial phenotypes, single lab\",\n      \"pmids\": [\"30352689\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"BCL2L13 recruits the ULK1 complex to initiate mitophagy. The ULK1 complex (but not ULK1's yeast counterpart components for starvation autophagy) is required for BCL2L13-mediated mitophagy in mammalian cells. Interaction of LC3B with both ULK1 and BCL2L13 is important for this process.\",\n      \"method\": \"Yeast ATG mutant screening, mammalian cell ULK1 complex knockdown/knockout, co-immunoprecipitation of BCL2L13 with ULK1 complex components, mitophagy flux assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal interaction assays plus genetic epistasis in both yeast and mammalian systems, multiple orthogonal methods\",\n      \"pmids\": [\"30625316\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Human BCL2L13 binds to VDAC1 (and previously reported ANT1/ANT2) at the outer mitochondrial membrane. VDAC1 and VDAC2 cooperatively promote effector caspase activation when co-expressed with BCL2L13. BCL2L13 (with its LIR motif mutated W276A/I279A) still causes mitochondrial fragmentation and perinuclear accumulation of fragmented mitochondria; VDAC knockdown also promotes this perinuclear accumulation.\",\n      \"method\": \"Co-immunoprecipitation, Drosophila genetic screen, caspase activity assay in 293T cells, siRNA knockdown of VDACs, live cell imaging of mitochondrial morphology\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus Drosophila genetic interaction plus functional caspase assay, single lab\",\n      \"pmids\": [\"31102594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"BCL2L13 (Bcl-rambo) selectively binds LC3C, GABARAP, and GABARAPL1 over other LC3/GABARAP family members. The selectivity depends on residues at the X2 position of BCL2L13's LIR motif and the HP1/HP2 sites of the LC3/GABARAP proteins. Disrupting this selective binding alters mitophagy induction in cells.\",\n      \"method\": \"In vitro binding assays, bioinformatics, site-directed mutagenesis of LIR and HP1/HP2 sites, mitophagy assays in cells with mutant constructs\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro binding with mutagenesis and in-cell functional validation, single lab\",\n      \"pmids\": [\"32828302\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PGAM5 interacts with BCL2L13 (Bcl-rambo) via the BCL2L13 transmembrane domain. PGAM5 co-expression promotes BCL2L13-dependent effector caspase activity but interferes with BCL2L13-dependent mitophagy (decreases LC3B-II accumulation induced by BCL2L13). The genetic interaction was confirmed in Drosophila where pgam5-2 knockdown partially rescues BCL2L13-induced rough eye phenotype.\",\n      \"method\": \"Co-immunoprecipitation, Drosophila genetic screen and rescue, caspase activity assay, LC3B-II immunoblot, domain mapping\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mapping plus Drosophila epistasis plus dual functional readouts (caspase/mitophagy), single lab\",\n      \"pmids\": [\"36075447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"BCL2L13 interacts with GRP75 (mortalin/HSPA9) via its No-BH domain, as confirmed by co-immunoprecipitation and GST pull-down. GRP75 co-expression facilitates elevated executioner caspase activity and PARP-1 cleavage induced by BCL2L13, and GRP75 knockdown suppresses BCL2L13-dependent caspase activation and cytochrome c release. Genetic interaction confirmed in Drosophila.\",\n      \"method\": \"Co-immunoprecipitation, GST pull-down, domain mapping, siRNA knockdown, caspase activity assay, PARP-1 cleavage assay, cytochrome c release assay, Drosophila genetic epistasis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — reciprocal biochemical binding assays (Co-IP + GST pulldown) plus domain mapping plus functional rescue and knockdown experiments plus in vivo genetic validation\",\n      \"pmids\": [\"37640805\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"BCL2L13 promotes mitophagy through DNM1L (Drp1)-mediated mitochondrial fission in glioblastoma cells. BCL2L13 targets DNM1L at the Ser616 phosphorylation site, leading to mitochondrial fission and increased mitophagy flux, which promotes GBM cell proliferation and invasion.\",\n      \"method\": \"Overexpression and knockdown in GBM cell lines, phospho-DNM1L-Ser616 immunoblot, mitochondrial morphology assay, mitophagy flux assay, in vitro proliferation/invasion assays, in vivo xenograft\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional KD/OE with defined mechanistic readout (DNM1L Ser616 phosphorylation), single lab\",\n      \"pmids\": [\"37660127\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Knockout of Bcl2l13 in mice has a statistically robust effect on germline purifying selection against transmission of a pathogenic heteroplasmic mtDNA mutation (C5024T in tRNAAla), establishing BCL2L13-dependent mitophagy as a contributor to maternal mtDNA quality control.\",\n      \"method\": \"Mouse knockout genetics, heteroplasmy quantification across generations, comparison with Parkin KO, Ulk1 KO, and Ulk2 KO mouse models\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic knockout with quantitative heteroplasmy measurement, multiple control KO lines tested in parallel\",\n      \"pmids\": [\"36608143\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"BCL2L13 is localized at mitochondria, ER, and mitochondria-associated membranes (MAMs) in mammalian cells. Loss of Bcl2l13 in zebrafish impairs skeletal muscle structure and function, alters cytosolic Ca2+ release and mitochondrial Ca2+ uptake, and decreases mitochondrial complex activity, without changing ER-mitochondria contact site number.\",\n      \"method\": \"Organelle fractionation, immunolocalization, zebrafish bcl2l13 knockout, calcium imaging, mitochondrial complex activity assay, siRNA knockdown in C2C12 cells\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — organelle fractionation for localization plus in vivo KO with defined functional readouts plus in vitro KD, multiple orthogonal methods\",\n      \"pmids\": [\"39175772\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"BCL2L13 interacts with LC3 to regulate receptor-mediated mitophagy in human saphenous vein endothelial cells during oxidative stress. o8G modification of miR-6513-5p causes it to lose targeted regulation of BCL2L13, contributing to BCL2L13 upregulation during oxidative stress.\",\n      \"method\": \"Proteomics, Co-IP of BCL2L13 with LC3, BCL2L13 knockdown/overexpression, mitophagy assays, miRNA target validation with o8G modification analysis\",\n      \"journal\": \"Advanced biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for BCL2L13-LC3 interaction plus functional mitophagy assays with KD, single lab\",\n      \"pmids\": [\"39307929\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"BCL2L13 exclusively uses the FIP200/ULK1 complex (not the WIPI-ATG13 complex) to initiate autophagosome biogenesis for mitophagy, distinguishing it from BNIP3/NIX receptors which use WIPI-ATG13, and from FKBP8 and TEX264 which can use both pathways.\",\n      \"method\": \"Reconstitution of autophagy initiation with purified components, genetic epistasis in cells with FIP200/ULK1 vs WIPI-ATG13 pathway perturbations\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — reconstitution approach plus genetic epistasis, preprint not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2024.08.28.609967\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PRKAA2 (AMPKα2) is the kinase responsible for phosphorylating BCL2L13 at Ser272, which is required for BCL2L13-mediated mitophagy activation in pressure-overloaded heart. bcl2l13 knockout and non-phosphorylatable BCL2L13-S272A knock-in mice show suppressed mitochondrial fission and mitophagy under pressure overload, leading to reduced ATP production. No additive effects were found in bcl2l13/prkn double knockout.\",\n      \"method\": \"Bcl2l13 knockout mice, knock-in mice (BCL2L13-S272A), transverse aortic constriction model, in vitro kinase assay identifying PRKAA2 as the kinase, mitophagy flux assays, ATP production measurement\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vivo KO and phospho-mutant knock-in mice with defined cardiac phenotype, in vitro kinase identification, multiple orthogonal methods\",\n      \"pmids\": [\"39995141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"BCL2L13 phosphorylation at Ser261 and Ser275 is induced by mitochondrial stress (CCCP) in an AMPK-dependent manner. TBK1, not ULK1, directly phosphorylates BCL2L13 at Ser275, revealing that BCL2L13 is uniquely regulated by both AMPK and innate immune stimuli among mitophagy receptors.\",\n      \"method\": \"Mass spectrometry phospho-mapping, phospho-specific antibody development, genetic studies with AMPK/ULK1/TBK1 knockout or inhibition, CCCP treatment\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — MS phospho-mapping with phospho-specific antibody validation and genetic kinase identification, preprint not yet peer-reviewed\",\n      \"pmids\": [\"40672348\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"MAP2K6 (MKK6) directly phosphorylates BCL2L13 at Ser426, enhancing the interaction between BCL2L13 and LC3B and thereby promoting mitophagy, inhibiting oxidative phosphorylation, and suppressing tumor growth in lung adenocarcinoma. MKK6 localizes to mitochondria and autophagosome interaction sites, and its pro-mitophagy function requires kinase activity but not p38 signaling.\",\n      \"method\": \"In vitro kinase assay, Co-IP of BCL2L13-LC3B with phospho-mutant BCL2L13-S426, subcellular fractionation of MKK6, loss-of-function studies in LUAD cells, mitophagy flux assay, OXPHOS measurement, in vivo tumor growth\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro kinase assay identifying direct phosphorylation, site-specific mutagenesis of Ser426, functional interaction assay (BCL2L13-LC3B Co-IP), mitophagy and tumor growth readouts\",\n      \"pmids\": [\"41886451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"GDF15 secreted by Omicron-stimulated epithelial cells upregulates BCL2L13 in T cells, driving bystander T-cell apoptosis. Genetic dampening of BCL2L13 blunts Omicron-specific high-intensity bystander apoptosis, and recombinant GDF15 increases BCL2L13 expression and apoptosis.\",\n      \"method\": \"Recombinant GDF15 treatment, BCL2L13 genetic knockdown, apoptosis assays, co-culture experiments with Omicron-infected epithelial cells\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KD with functional apoptosis readout plus recombinant protein rescue, single lab\",\n      \"pmids\": [\"41896204\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"BCL2L13 (Bcl-rambo/MIL1) is an outer mitochondrial membrane protein with BH1-4 domains and a unique C-terminal extension that drives apoptosis via caspase activation (not through BH-domain interactions with other Bcl-2 family members); it also functions as a mitophagy receptor through its LIR motif, which selectively binds LC3C/GABARAP/GABARAPL1 and recruits the FIP200/ULK1 complex to initiate mitophagy; its mitophagy activity is activated by phosphorylation at Ser272/Ser275/Ser426 by PRKAA2/AMPKα2, TBK1, and MKK6, respectively; it inhibits ceramide synthases CerS2/6 via its C-terminal insert domain; interacts with VDAC1/2, ANT1/2, GRP75, and PGAM5 to modulate apoptosis and mitophagy; regulates mitochondrial fission via DNM1L; contributes to germline mtDNA purifying selection; and localizes to MAMs where it regulates ER-mitochondria calcium signaling in skeletal muscle.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"BCL2L13 (Bcl-rambo/MIL1) is an outer mitochondrial membrane protein of the Bcl-2 family that operates two distinct effector programs—apoptosis and mitophagy—through structurally separable modules [#0, #3]. Its pro-apoptotic activity is driven not by canonical BH-domain interactions with other Bcl-2 family members, which it does not engage, but by its unique C-terminal membrane-anchored domain, and the resulting cell death is caspase-dependent and blocked by IAPs [#0]. This caspase-activating function is amplified by physical partners at the outer membrane and intermembrane space: VDAC1/2 cooperatively promote effector caspase activation, PGAM5 binds the transmembrane domain to favor caspase activity over mitophagy, and GRP75/mortalin binds the No-BH domain to facilitate executioner caspase activation, PARP-1 cleavage, and cytochrome c release [#8, #10, #11]. Independently of apoptosis, BCL2L13 acts as a mammalian functional analog of the yeast mitophagy receptor Atg32, using its BH domains for mitochondrial fragmentation and its WXXL/LIR motif for mitophagy, and complementing atg32Δ yeast [#3]. The LIR motif selectively engages LC3C, GABARAP, and GABARAPL1 and recruits the FIP200/ULK1 complex to nucleate autophagosome biogenesis, operating independently of Parkin and, for fragmentation, of DNM1L [#3, #7, #9]. Its mitophagy activity is switched on by phosphorylation: PRKAA2/AMPKα2 phosphorylates Ser272 to drive mitophagy in pressure-overloaded heart, TBK1 phosphorylates Ser275 under mitochondrial stress, and MAP2K6/MKK6 phosphorylates Ser426 to strengthen the BCL2L13–LC3B interaction [#17, #18, #19]. Through its C-terminal insert BCL2L13 also binds and inhibits ceramide synthases CerS2/CerS6, blocking ceramide-induced apoptosis upstream of BAX [#2]. Physiologically, BCL2L13 contributes to germline purifying selection against pathogenic heteroplasmic mtDNA [#13] and localizes to mitochondria-associated membranes where it shapes ER–mitochondria calcium signaling and mitochondrial complex activity in skeletal muscle [#14].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established that BCL2L13 is a mitochondrial Bcl-2 family member whose death activity is mechanistically unusual—driven by its C-terminal anchor and caspases rather than BH-domain heterodimerization.\",\n      \"evidence\": \"Overexpression, subcellular fractionation, domain deletion, and caspase/IAP inhibitor rescue in mammalian cells, plus interaction screens against Bcl-2 family members\",\n      \"pmids\": [\"11262395\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the caspase activation pathway or direct molecular partners\", \"Mechanism by which the C-terminal domain triggers death left unresolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Showed a splice variant generates a cytosolic BH4-only protein, indicating isoform-dependent control of BCL2L13 pro-apoptotic output.\",\n      \"evidence\": \"Cloning/sequencing of Bcl-rambo beta, localization, mutagenesis removing the Alu insert, and drug-induced cell death assays\",\n      \"pmids\": [\"12527362\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; physiological abundance of the variant unknown\", \"Mechanism by which the cytosolic variant promotes death not defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified a non-canonical anti-apoptotic role: BCL2L13 inhibits ceramide synthases CerS2/6 via its C-terminal insert, blocking ceramide-driven apoptosis upstream of BAX.\",\n      \"evidence\": \"Co-IP with domain mapping, in vitro ceramide synthase activity assays, siRNA loss-of-function, and in vivo tumor growth\",\n      \"pmids\": [\"24706805\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the same protein reconciles pro- and anti-apoptotic activities not resolved\", \"No structural basis for CerS binding\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined BCL2L13 as a mammalian mitophagy receptor functionally equivalent to yeast Atg32, with separable domains for fragmentation versus mitophagy.\",\n      \"evidence\": \"Domain mutagenesis (BH and LIR mutants), knockdown, mitophagy flux assays, and cross-species complementation in atg32Δ yeast\",\n      \"pmids\": [\"26506896\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the downstream autophagy machinery recruited\", \"Physiological mitophagy contexts not established\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Linked BCL2L13 to non-apoptotic caspase regulation in neural progenitors under microRNA control.\",\n      \"evidence\": \"Proteomics, siRNA knockdown, caspase-3 and cytochrome c release assays, and miR-124/miR-137 target validation\",\n      \"pmids\": [\"26207921\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Direct molecular mechanism connecting BCL2L13 to caspase-3 control not defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Resolved the autophagy initiation machinery, showing BCL2L13 recruits the ULK1 complex with LC3B bridging BCL2L13 and ULK1.\",\n      \"evidence\": \"Yeast ATG mutant screening, mammalian ULK1 complex knockout, reciprocal Co-IP, and mitophagy flux assays\",\n      \"pmids\": [\"30625316\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Selectivity among ATG8 family members not yet defined here\", \"How recruitment is regulated upstream unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined VDAC1/2 as outer-membrane partners that cooperatively amplify BCL2L13-driven caspase activation, separating the apoptotic and morphological roles.\",\n      \"evidence\": \"Co-IP, Drosophila genetic screen, caspase assays, VDAC siRNA, and live-cell mitochondrial imaging\",\n      \"pmids\": [\"31102594\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Direct vs indirect nature of VDAC contribution to caspase activation unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established the structural basis of ATG8 selectivity, showing BCL2L13's LIR selectively binds LC3C/GABARAP/GABARAPL1.\",\n      \"evidence\": \"In vitro binding assays, LIR X2 and HP1/HP2 mutagenesis, and mitophagy assays in cells\",\n      \"pmids\": [\"32828302\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Functional consequence of selectivity in vivo not established\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed PGAM5 binds the transmembrane domain to bias BCL2L13 toward caspase activation and away from mitophagy, revealing a partner-controlled switch between its two programs.\",\n      \"evidence\": \"Co-IP with domain mapping, Drosophila epistasis/rescue, caspase assays, and LC3B-II immunoblot\",\n      \"pmids\": [\"36075447\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Mechanism by which PGAM5 toggles output not biochemically defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified GRP75/mortalin as a No-BH-domain partner that potentiates executioner caspase activation and cytochrome c release.\",\n      \"evidence\": \"Co-IP and GST pull-down with domain mapping, siRNA knockdown, caspase/PARP-1/cytochrome c assays, and Drosophila epistasis\",\n      \"pmids\": [\"37640805\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How GRP75 binding couples to caspase machinery not resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Connected BCL2L13 to DNM1L-mediated fission in cancer, with targeting of DNM1L Ser616 promoting mitophagy and tumor cell aggression.\",\n      \"evidence\": \"OE/KD in GBM cells, phospho-DNM1L-Ser616 immunoblot, mitochondrial morphology and mitophagy flux, and xenografts\",\n      \"pmids\": [\"37660127\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; reconciles incompletely with prior DNM1L-independent fragmentation report\", \"Whether BCL2L13 directly modifies DNM1L unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrated an in vivo physiological role: BCL2L13-dependent mitophagy contributes to germline purifying selection against pathogenic mtDNA.\",\n      \"evidence\": \"Mouse Bcl2l13 knockout with heteroplasmy quantification across generations, benchmarked against Parkin/Ulk1/Ulk2 KO lines\",\n      \"pmids\": [\"36608143\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cell-type and developmental window of selection not defined\", \"Relative contribution versus other receptors not quantified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Placed BCL2L13 at MAMs and assigned a calcium-handling and bioenergetic role in skeletal muscle.\",\n      \"evidence\": \"Organelle fractionation, immunolocalization, zebrafish bcl2l13 knockout, calcium imaging, complex activity assays, and C2C12 knockdown\",\n      \"pmids\": [\"39175772\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism linking BCL2L13 to Ca2+ flux unknown\", \"Relationship between MAM localization and mitophagy not established\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed BCL2L13-LC3 receptor mitophagy operates in endothelial oxidative stress under microRNA control.\",\n      \"evidence\": \"Proteomics, BCL2L13-LC3 Co-IP, KD/OE mitophagy assays, and o8G-modified miR-6513-5p target analysis\",\n      \"pmids\": [\"39307929\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Direct contribution of BCL2L13 to endothelial protection not isolated\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified PRKAA2/AMPKα2 as the kinase phosphorylating Ser272 to activate cardiac mitophagy, with phospho-mutant knock-in mice confirming functional requirement.\",\n      \"evidence\": \"Bcl2l13 KO and BCL2L13-S272A knock-in mice, transverse aortic constriction, in vitro kinase assay, mitophagy flux, and ATP measurement\",\n      \"pmids\": [\"39995141\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Ser272 phosphorylation activates the receptor structurally unknown\", \"Interplay with other phospho-sites not addressed\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Defined MAP2K6/MKK6 phosphorylation of Ser426 as a switch strengthening BCL2L13-LC3B binding and suppressing tumor growth via mitophagy.\",\n      \"evidence\": \"In vitro kinase assay, BCL2L13-S426 mutant Co-IP, MKK6 fractionation, LUAD loss-of-function, mitophagy/OXPHOS readouts, and tumor growth\",\n      \"pmids\": [\"41886451\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How three distinct kinases coordinate distinct phospho-sites unresolved\", \"Context determining which kinase dominates unknown\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Linked GDF15 signaling to BCL2L13 induction driving bystander T-cell apoptosis in viral infection.\",\n      \"evidence\": \"Recombinant GDF15 treatment, BCL2L13 knockdown, apoptosis assays, and co-culture with Omicron-infected epithelial cells\",\n      \"pmids\": [\"41896204\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Signaling intermediate between GDF15 and BCL2L13 transcription unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How BCL2L13 partitions between its pro-apoptotic and pro-mitophagic programs—and how partner binding, isoform choice, and multi-kinase phosphorylation are integrated into a single decision—remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of full-length BCL2L13 or its domain switch\", \"Hierarchy and crosstalk among AMPK/TBK1/MKK6 phospho-sites undefined\", \"Mechanism coupling MAM calcium signaling to mitophagy unestablished\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 7, 9]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 8, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005741\", \"supporting_discovery_ids\": [0, 8, 14]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 3, 14]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [14]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [3, 7, 16]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 8, 11]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [13, 14]}\n    ],\n    \"complexes\": [\"FIP200/ULK1 complex\"],\n    \"partners\": [\"VDAC1\", \"VDAC2\", \"PGAM5\", \"HSPA9\", \"MAP3K6\", \"MAP2K6\", \"CERS2\", \"CERS6\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":8,"faith_total":8,"faith_pct":100.0}}