{"gene":"TOMM5","run_date":"2026-04-28T21:42:59","timeline":{"discoveries":[{"year":1998,"finding":"Tom5 in the yeast TOM complex recognizes the mitochondria-targeting sequence (MTS) of preproteins, functioning as a component of the outer membrane protein translocation machinery that mediates transfer of preproteins from receptors to the Tom40 channel.","method":"Biochemical characterization of TOM complex components; reconstitution of preprotein import pathway in yeast","journal":"Journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — biochemical pathway characterization, single review synthesis; replicated across multiple labs","pmids":["9603986"],"is_preprint":false},{"year":1998,"finding":"Tom5, Tom6, and Tom7 are small subunits of the ~400 kDa general import pore (GIP) complex of yeast mitochondria, which also contains Tom40 and Tom22. Tom6 promotes stable association of Tom22 with Tom40, and its absence causes dissociation of Tom22 and formation of a ~100 kDa subcomplex containing Tom40, Tom7, and Tom5.","method":"Blue native PAGE, co-immunoprecipitation, yeast mutant analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP, native PAGE, genetic mutants; replicated across multiple labs","pmids":["9774667"],"is_preprint":false},{"year":2001,"finding":"Tom5 participates in the assembly of the yeast Tom40 import channel: the Tom40 precursor first assembles with Tom5 to form a ~250 kDa intermediate exposed to the intermembrane space, before progression to the mature ~400 kDa GIP complex.","method":"Pulse-chase import assays, native PAGE, sequential assembly intermediate analysis","journal":"Nature structural biology","confidence":"High","confidence_rationale":"Tier 1/2 — defined assembly intermediates with multiple methods, replicated","pmids":["11276259"],"is_preprint":false},{"year":2001,"finding":"Tom5 is part of the stable TOM GIP core complex together with Tom40 and Tom22. Under stringent detergent conditions, Tom5 (along with Tom20 and other small Toms) is released while preprotein remains in the GIP, indicating Tom5 is not essential for preprotein holding but contributes to complex architecture.","method":"Urea/alkaline resistance assays, detergent fractionation, preprotein arrest experiments, electrophysiology","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1/2 — multiple biochemical methods, orthogonal approaches","pmids":["11259583"],"is_preprint":false},{"year":2001,"finding":"Biogenesis of yeast porin (VDAC) depends on Tom5 of the GIP complex, in addition to Tom20, Tom22, and Tom40, as shown by import competition and mutant analysis.","method":"In organello import assays, competition assays, yeast mutants lacking individual Tom proteins","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — genetic mutants with defined import readouts, replicated across two organisms","pmids":["11266446"],"is_preprint":false},{"year":1999,"finding":"Import of small Tim proteins of the mitochondrial IMS uses a novel pathway where surface receptors Tom20 and Tom70 are dispensable, but Tom5 of the GIP complex is crucial, defining a third import route.","method":"In organello import assays in yeast mutants lacking individual Tom proteins","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — genetic dissection with defined readout, novel route established","pmids":["10397776"],"is_preprint":false},{"year":2002,"finding":"Insertion of bacterial porin PorB into the mitochondrial outer membrane in vitro depends on Tom5, Tom20, and Tom40, but is independent of Tom70, demonstrating a shared import mechanism with VDAC.","method":"In vitro import assays into isolated mitochondria; antibody inhibition of specific TOM subunits","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro import with defined subunit requirements","pmids":["11953311"],"is_preprint":false},{"year":2002,"finding":"Bcl-2alpha insertion into the yeast mitochondrial outer membrane does not require Tom5 or Tom40, demonstrating that Bcl-2alpha bypasses the GIP and follows a pathway distinct from that requiring Tom5.","method":"In organello import assays in yeast tom5 and tom40 mutants","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 — genetic mutant import assays defining pathway specificity","pmids":["12419260"],"is_preprint":false},{"year":2002,"finding":"Yeast Tom5 is a C-tail-anchored protein; the signal directing it to the mitochondrial outer membrane requires an appropriate TMS length, a proline at a correct position within the TMS, and specific surrounding residues, but (unlike dispersed outer membrane proteins) does not require a positive C-terminal segment.","method":"GFP reporter fusions with systematic deletions/mutations, confocal microscopy, cell fractionation, blue native PAGE complementation in tom5-ts yeast","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — systematic mutagenesis with multiple functional readouts","pmids":["12896971"],"is_preprint":false},{"year":2002,"finding":"The mitochondrial targeting signal for C-tail-anchored proteins in mammals, using yeast Tom5 as a model in COS-7 cells, requires three basic amino acid residues in the C-terminal five-residue segment and an appropriate TMS length; elongation of TMS or separation of TMS and C-segment impairs targeting.","method":"GFP reporter fusions expressed in COS-7 cells, confocal microscopy, cell fractionation","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — systematic mutagenesis with imaging and fractionation","pmids":["12006657"],"is_preprint":false},{"year":2003,"finding":"Import of cytochrome c into yeast mitochondria does not require Tom5, Tom6, or Tom7, establishing that these small Tom proteins are dispensable for this particular import pathway.","method":"In organello import assays in yeast mutants lacking individual Tom proteins","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 — genetic dissection with defined readout","pmids":["12628251"],"is_preprint":false},{"year":2005,"finding":"Identification of Neurospora crassa Tom5 as a TOM complex subunit with its C-terminus facing the IMS. In yeast, Tom5 is required for structural stability of the TOM complex and efficient protein import, but Neurospora Tom5 knockout shows no growth or import defect, indicating organism-specific roles. Yeast TOM5 deletion can be rescued by overexpression of Neurospora Tom5.","method":"Identification by sequence analysis and biochemistry; tom5 deletion in both yeast and Neurospora; import assays; blue native PAGE; complementation experiments","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — cross-species genetic analysis with import and structural assays","pmids":["15701639"],"is_preprint":false},{"year":2005,"finding":"Import of yeast Taz1 (tafazzin) into mitochondria depends on the receptor Tom5 of the TOM complex and the small Tim proteins of the IMS, but is independent of the SAM complex.","method":"In organello import assays in yeast mutants; submitochondrial fractionation","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 — genetic mutant import assays defining pathway","pmids":["16135531"],"is_preprint":false},{"year":2000,"finding":"The cytosolic domain of yeast TOM5 forms a stable helical structure: CD spectroscopy shows a pH-invariant helical conformation, and NMR NOESY data reveal a stable helical core between residues E11 and R15 with a less rigid helix extending to the C-terminus.","method":"Circular dichroism (CD) spectroscopy, NMR (NOESY)","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 1 — structural determination by NMR and CD; single study","pmids":["10683449"],"is_preprint":false},{"year":2009,"finding":"A subcomplex of Tom5 and Tom40 associates with the SAM core complex to form a large SAM complex involved in biogenesis of the alpha-helical Tom6 protein after Mim1-dependent membrane insertion.","method":"Blue native PAGE, co-immunoprecipitation, import assays in yeast mutants","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 2 — multiple methods, genetic mutants, defined assembly intermediates","pmids":["20026336"],"is_preprint":false},{"year":2010,"finding":"Tom5 promotes the second stage of Tom40 assembly at the SAM complex. Mim1-deficient mitochondria accumulate Tom40 at the first SAM stage like Tom5-deficient mitochondria; overexpression of Tom5 suppresses the Tom40 assembly defect of mim1Δ mitochondria, placing Tom5 downstream of Mim1 in the Tom40 biogenesis pathway.","method":"Import assays, blue native PAGE, epistasis analysis in yeast mutants","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with defined assembly intermediates","pmids":["20668160"],"is_preprint":false},{"year":2010,"finding":"Tom5 and Tom6 play a stimulatory role in biogenesis of Tom40 at the SAM complex, antagonized by Tom7; Tom5 and Tom6 associate with the Tom40 precursor at an early assembly stage, while Tom7 inhibits this step and additionally promotes dissociation of the SAM-Mdm10 complex.","method":"Import assays, blue native PAGE, genetic epistasis in yeast mutants","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic mutants with defined assembly readouts","pmids":["21059357"],"is_preprint":false},{"year":2008,"finding":"Tom5 (along with Tom22, Tom7, and Tom6) functions as a modulator of the pore dynamics of Tom40, significantly reducing the energy barrier between different conformational states of the TOM channel.","method":"Planar lipid bilayer electrophysiology with purified TOM core complex and Tom40 from Neurospora crassa","journal":"Biophysical journal","confidence":"Medium","confidence_rationale":"Tier 1 — in vitro reconstitution electrophysiology; single study","pmids":["18456827"],"is_preprint":false},{"year":2008,"finding":"Human Tom5 and Tom6 were identified as components of the human TOM complex by immunoisolation from HeLa cells. They associate with Tom40 in the TOM complex. Knockdown of hTom40 decreases levels of all small Tom proteins. Double knockdown of any combination of small Tom proteins (Tom5, Tom6, Tom7) affects matrix import of preproteins.","method":"FLAG-immunoisolation of TOM complex from HeLa cells, mass spectrometry identification, siRNA knockdown, import assays","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 2 — co-IP/MS identification, genetic knockdown with functional readout; first identification of human TOMM5","pmids":["18331822"],"is_preprint":false},{"year":2014,"finding":"Yeast Tom5 of the TOM complex interacts with all Emc proteins of the ER membrane protein complex (EMC), and this interaction is important for phosphatidylserine (PS) transfer from the ER to mitochondria and for cell growth, suggesting that the EMC forms an ER-mitochondria tether by associating with the TOM complex through Tom5.","method":"Genetic screen, co-immunoprecipitation, lipid transfer assays, growth assays in yeast","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 — genetic screen + reciprocal co-IP + functional lipid transfer assays","pmids":["25313861"],"is_preprint":false},{"year":2017,"finding":"Cryo-EM structure of the Neurospora crassa TOM core complex at ~10 Å resolution shows Tom5, Tom6, and Tom7 transmembrane segments surrounding each Tom40 β-barrel pore in the dimeric complex, with Tom22 connecting the two Tom40 pores at the dimer interface.","method":"Cryo-electron microscopy, single particle analysis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structure with defined subunit placement","pmids":["28802041"],"is_preprint":false},{"year":2020,"finding":"Atomic resolution cryo-EM structure of the dimeric human TOM core complex shows TOMM5, TOMM6, and TOMM7 surrounding the Tom40 channels at the periphery of the dimer; the N-terminal segment of Tom40 spans from cytosol to IMS to interact with Tom5 at the dimer periphery, providing insight into preprotein translocation paths.","method":"Single-particle cryo-EM at near-atomic resolution","journal":"Cell discovery","confidence":"High","confidence_rationale":"Tier 1 — high-resolution structure with functional interpretation; replicated by multiple cryo-EM studies","pmids":["33083003"],"is_preprint":false},{"year":2012,"finding":"Tomm5 knockout mice (Tomm5−/−) develop a lung-specific phenotype of cryptogenic organizing pneumonia (COP/BOOP), characterized by intra-alveolar fibrosis with fibroblasts/myofibroblasts in alveolar lumina and eosinophilic inflammation, while other organ systems appear normal.","method":"Knockout mouse model; histopathology","journal":"Veterinary pathology","confidence":"Medium","confidence_rationale":"Tier 2/3 — defined KO phenotype but mechanism not fully elucidated","pmids":["22688586"],"is_preprint":false},{"year":2024,"finding":"TOMM5 regulates mitochondrial membrane potential in alveolar epithelial cells. In a bleomycin-induced murine model of organizing pneumonia, TOMM5 levels increase with lung fibrosis. In vitro, TOMM5 reduces the proportion of early apoptotic cells and promotes cell proliferation.","method":"In vitro knockdown/overexpression in alveolar epithelial cells; mitochondrial membrane potential assays; flow cytometry for apoptosis; bleomycin mouse model","journal":"Redox report","confidence":"Medium","confidence_rationale":"Tier 2/3 — defined cellular phenotypes with functional assays, single study","pmids":["38794801"],"is_preprint":false},{"year":2025,"finding":"Cryo-EM structure of human PINK1 at a TOM-VDAC array shows that TOM5 participates in symmetric arrangement of two TOM core complexes around a central VDAC2 dimer, and that TOM5 binds the PINK1 kinase C-lobe, stabilizing PINK1 at the TOM complex during mitophagy.","method":"Single-particle cryo-EM at 3.1 Å resolution of endogenous TOM-VDAC complex; structural analysis of PINK1 interaction","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 — high-resolution cryo-EM structure with defined protein interactions","pmids":["40080546"],"is_preprint":false},{"year":2025,"finding":"TOMM5 (as a TOM complex subunit) is required for PINK1 retention on the mitochondrial surface during mitophagy. Ablation of TOM (including TOMM5) prevents PINK1 accumulation at the outer membrane when membrane potential is lost, establishing TOM as the platform for PINK1 stabilization.","method":"Genome-wide CRISPR screen with novel Parkin reporter; genetic ablation of TOM subunits; PINK1 import/retention assays","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 — CRISPR screen + functional import/retention assays; single study","pmids":["41266657"],"is_preprint":false},{"year":2025,"finding":"The HSP90-CDC37 chaperone complex holds PINK1 in a partially unfolded state; the C-terminal extension (CTE) of PINK1 is covered by HSP90 in a region that overlaps with the TOM5 and TOM20 interaction sites, suggesting that chaperone release is coupled to TOM engagement for PINK1 import/stabilization.","method":"Cryo-EM structure of human PINK1-HSP90-CDC37 complex","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 1 method but preprint; TOM5 interaction is structural inference","pmids":["bio_10.1101_2025.10.17.682828"],"is_preprint":true},{"year":2025,"finding":"The Drosophila TOM complex cryo-EM structure at 3.3 Å shows Tom5 as one of four endogenous TOM components co-assembled with Tom40, confirming evolutionary conservation of Tom5's position surrounding the Tom40 β-barrel. Small conformational differences at subunit interfaces relative to human TOM are attributable to lipid-binding residue variation.","method":"Single-particle cryo-EM of ex vivo Drosophila TOM complex","journal":"IUCrJ","confidence":"High","confidence_rationale":"Tier 1 — high-resolution structure confirming conserved subunit architecture","pmids":["39575538"],"is_preprint":false},{"year":2011,"finding":"A CTCF-mediated insulator loop encompassing the TOMM5 gene resides between synthetically interacting genetic elements of the breast cancer susceptibility locus MCS5A/Mcs5a, suggesting TOMM5 is located within a higher-order chromatin structure relevant to locus regulation.","method":"CTCF ChIP, chromatin conformation capture (3C), transgenic rat models","journal":"Nucleic acids research","confidence":"Low","confidence_rationale":"Tier 3 — localization/regulatory context but no direct mechanistic finding about TOMM5 protein function","pmids":["21914726"],"is_preprint":false},{"year":2011,"finding":"Proapoptotic fusion protein p53-Tom5, in which wild-type p53 is fused to the mitochondrial transmembrane domain of Tom5, exclusively localizes to mitochondria in ARF-null A549 lung cancer cells, induces mitochondrial dysfunction and cytochrome c release, and suppresses cell proliferation — effects not seen with wild-type p53 alone.","method":"Plasmid transfection; confocal microscopy localization; cell proliferation assays; cytochrome c release assay","journal":"Biological & pharmaceutical bulletin","confidence":"Low","confidence_rationale":"Tier 3 — single study using artificial fusion protein to deliver p53 to mitochondria via Tom5 TMS","pmids":["21467644"],"is_preprint":false}],"current_model":"TOMM5 (Tom5) is a small C-tail-anchored subunit of the translocase of the outer mitochondrial membrane (TOM) complex whose C-terminus faces the intermembrane space; it participates in the structural stability of the ~400 kDa GIP complex, facilitates transfer of preproteins from surface receptors to the Tom40 channel, acts as an assembly factor that promotes the second SAM-stage interaction during Tom40 biogenesis, forms part of the ER-mitochondria tether by interacting with EMC proteins, surrounds the Tom40 β-barrel in the dimeric TOM core complex as revealed by cryo-EM structures in Neurospora, yeast, human, and Drosophila, and is required for PINK1 retention at the outer membrane during PINK1-Parkin-mediated mitophagy, with TOMM5 deficiency in mice causing cryptogenic organizing pneumonia linked to mitochondrial membrane potential dysregulation in alveolar epithelial cells."},"narrative":{"teleology":[{"year":1998,"claim":"Establishing Tom5 as a core subunit of the TOM GIP complex resolved the identity of the small proteins surrounding Tom40 and showed Tom5 participates in preprotein transfer from receptors to the channel.","evidence":"Biochemical characterization, blue native PAGE, co-immunoprecipitation, and yeast mutant analysis of TOM complex components","pmids":["9603986","9774667"],"confidence":"High","gaps":["Precise binding site on Tom40 unknown","Contribution of Tom5 versus other small Toms not individually resolved"]},{"year":1999,"claim":"Demonstration that Tom5 is essential for import of small Tim IMS proteins—but dispensable for cytochrome c import—defined substrate-selective roles within the GIP complex.","evidence":"In organello import assays in yeast mutants lacking individual Tom proteins","pmids":["10397776"],"confidence":"High","gaps":["Mechanism of selectivity at Tom5 not structurally resolved","Whether selectivity is conserved in mammals unknown"]},{"year":2001,"claim":"Identification of a Tom5-containing ~250 kDa assembly intermediate showed that Tom5 participates early in Tom40 biogenesis, prior to formation of the mature GIP.","evidence":"Pulse-chase import assays with native PAGE in yeast","pmids":["11276259","11259583"],"confidence":"High","gaps":["Order of small Tom association during assembly not fully kinetically resolved","Role of lipid environment in assembly intermediate formation unclear"]},{"year":2002,"claim":"Systematic mutagenesis of the Tom5 C-tail anchor defined the targeting determinants (TMS length, internal proline, charged C-terminal residues) for outer membrane insertion of C-tail-anchored mitochondrial proteins.","evidence":"GFP fusions with systematic deletions/mutations expressed in yeast and mammalian COS-7 cells; confocal microscopy and fractionation","pmids":["12896971","12006657"],"confidence":"High","gaps":["Receptor or insertase for Tom5 biogenesis not identified","Whether MIM/Mim1 pathway inserts Tom5 itself not tested"]},{"year":2008,"claim":"Identification of human TOMM5 and TOMM6 as bona fide TOM complex subunits, and demonstration that combinatorial knockdown of small Tom proteins impairs matrix import, extended the functional framework from yeast to humans.","evidence":"FLAG-immunoisolation and mass spectrometry from HeLa cells; siRNA double knockdowns with import assays","pmids":["18331822"],"confidence":"High","gaps":["Individual contribution of human TOMM5 versus TOMM6/TOMM7 not separately quantified","Human assembly intermediates not characterized"]},{"year":2010,"claim":"Genetic epistasis showed Tom5 acts downstream of Mim1 to promote the second SAM-stage interaction during Tom40 biogenesis, and that Tom5/Tom6 stimulate while Tom7 antagonizes this step, revealing opposing modulatory roles of the small Toms.","evidence":"Blue native PAGE, import assays, epistasis analysis in yeast single and double mutants","pmids":["20668160","21059357"],"confidence":"High","gaps":["Direct structural contacts between Tom5 and SAM complex not resolved","Mechanism by which Tom7 opposes Tom5 function unknown"]},{"year":2012,"claim":"Tomm5-knockout mice developed lung-specific cryptogenic organizing pneumonia, establishing the first in vivo mammalian phenotype and suggesting a tissue-selective role for TOMM5 in alveolar homeostasis.","evidence":"Knockout mouse model with histopathology","pmids":["22688586"],"confidence":"Medium","gaps":["Molecular mechanism linking TOMM5 loss to pneumonia not established","Import defects in alveolar cells not directly measured","Single mouse model without independent replication"]},{"year":2014,"claim":"Discovery that Tom5 interacts with all EMC subunits and that this interaction mediates phosphatidylserine transfer from ER to mitochondria revealed a non-canonical tethering function for a TOM subunit at ER–mitochondria contact sites.","evidence":"Genetic screen, reciprocal co-immunoprecipitation, lipid transfer assays, and growth assays in yeast","pmids":["25313861"],"confidence":"High","gaps":["Whether the EMC-Tom5 tether is conserved in mammals not tested","Structural basis of Tom5–EMC interaction unknown","Relative contribution to total ER–mitochondria PS flux unclear"]},{"year":2020,"claim":"Atomic-resolution cryo-EM structures of the human and Neurospora TOM core complexes placed TOMM5 at the periphery of the Tom40 β-barrel and showed the Tom40 N-terminal segment contacts Tom5 at the IMS face, providing a structural rationale for preprotein hand-off.","evidence":"Single-particle cryo-EM at near-atomic resolution","pmids":["33083003","28802041"],"confidence":"High","gaps":["Dynamics of Tom5 during active translocation not captured","Lipid interactions at the Tom5–Tom40 interface not fully modeled"]},{"year":2024,"claim":"Functional studies in alveolar epithelial cells showed that TOMM5 regulates mitochondrial membrane potential, suppresses early apoptosis, and promotes proliferation, mechanistically linking TOMM5 to the organizing pneumonia phenotype observed in knockout mice.","evidence":"In vitro knockdown/overexpression with membrane potential assays, flow cytometry for apoptosis, and bleomycin mouse model","pmids":["38794801"],"confidence":"Medium","gaps":["Whether membrane potential effect is direct or secondary to import defects not resolved","Specific import substrates affected in alveolar cells unknown"]},{"year":2025,"claim":"High-resolution cryo-EM of PINK1 at a TOM-VDAC array showed TOMM5 directly contacts the PINK1 kinase C-lobe, and genetic ablation confirmed the TOM complex is required for PINK1 retention during mitophagy, establishing a direct structural role for TOMM5 in the PINK1-Parkin pathway.","evidence":"Cryo-EM at 3.1 Å of endogenous TOM-VDAC complex (Science); CRISPR screen and genetic ablation with PINK1 retention assays (EMBO J); Drosophila cryo-EM confirming conserved Tom5 architecture (IUCrJ)","pmids":["40080546","41266657","39575538"],"confidence":"High","gaps":["Whether TOMM5 loss alone (versus full TOM ablation) is sufficient to prevent PINK1 retention not individually tested","How TOMM5–PINK1 interaction is regulated by membrane potential not known"]},{"year":null,"claim":"Key open questions include: whether the Tom5–EMC tethering function is conserved in mammals; the structural basis for substrate selectivity at the Tom5 stage of import; and how TOMM5-dependent PINK1 stabilization is coordinated with chaperone release and membrane potential sensing.","evidence":"","pmids":[],"confidence":"Low","gaps":["No mammalian EMC–TOMM5 interaction data","No time-resolved structure of translocation through Tom5-containing pore","Individual TOMM5 knockout in human cells for PINK1 pathway not reported"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[1,3,11,20,21]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,5,19]},{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,5,18]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[1,8,9,18,20,21,24,27]}],"pathway":[{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,2,5,15,18]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[2,15,16]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[2,14,15,16,20,21]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[24,25]},{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[19]}],"complexes":["TOM complex (GIP/TOM core)","SAM-Tom5-Tom40 assembly intermediate"],"partners":["TOMM40","TOMM22","TOMM6","TOMM7","PINK1","VDAC2","EMC1"],"other_free_text":[]},"mechanistic_narrative":"TOMM5 is a small, C-tail-anchored subunit of the translocase of the outer mitochondrial membrane (TOM) complex that contributes to the structural integrity of the general import pore (GIP) and facilitates preprotein transfer from surface receptors to the Tom40 translocation channel [PMID:9774667, PMID:10397776]. Its transmembrane segment surrounds the Tom40 β-barrel in the dimeric TOM core complex, as demonstrated by cryo-EM structures across fungi, Drosophila, and humans [PMID:28802041, PMID:33083003, PMID:39575538]. TOMM5 acts as an assembly factor that promotes Tom40 biogenesis at the SAM complex, interacts with EMC proteins to form an ER–mitochondria tether important for phosphatidylserine transfer, and stabilizes PINK1 at the outer membrane during PINK1-Parkin-mediated mitophagy [PMID:20668160, PMID:25313861, PMID:40080546]. Tomm5-knockout mice develop cryptogenic organizing pneumonia, linked to dysregulated mitochondrial membrane potential in alveolar epithelial cells [PMID:22688586, PMID:38794801]."},"prefetch_data":{"uniprot":{"accession":"Q8N4H5","full_name":"Mitochondrial import receptor subunit TOM5 homolog","aliases":[],"length_aa":51,"mass_kda":6.0,"function":"Component of the translocase of the outer membrane of mitochondria (TOM) complex essential for the recognition and translocation of cytosolically synthesized mitochondrial preproteins (PubMed:40080546). The TOM complex associates with the ion channel VDAC2 and PINK1 kinase at depolarized mitochondria, this interaction stabilizes PINK1 at the outer mitochondrial membrane and triggers downstream mitophagy by the recruitment of the E3 ubiquitin ligase PRKN (PubMed:40080546)","subcellular_location":"Mitochondrion outer membrane","url":"https://www.uniprot.org/uniprotkb/Q8N4H5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TOMM5","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"FKBP8","stoichiometry":0.2},{"gene":"RAB1A","stoichiometry":0.2},{"gene":"RAB2A","stoichiometry":0.2},{"gene":"TOMM20A","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/TOMM5","total_profiled":1310},"omim":[{"mim_id":"616169","title":"TRANSLOCASE OF OUTER MITOCHONDRIAL MEMBRANE 5; TOMM5","url":"https://www.omim.org/entry/616169"},{"mim_id":"616168","title":"TRANSLOCASE OF OUTER MITOCHONDRIAL MEMBRANE 6; TOMM6","url":"https://www.omim.org/entry/616168"},{"mim_id":"607980","title":"TRANSLOCASE OF OUTER MITOCHONDRIAL MEMBRANE 7; TOMM7","url":"https://www.omim.org/entry/607980"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Mitochondria","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TOMM5"},"hgnc":{"alias_symbol":["bA613M10.3","Tom5"],"prev_symbol":["C9orf105"]},"alphafold":{"accession":"Q8N4H5","domains":[{"cath_id":"1.20.5","chopping":"11-51","consensus_level":"medium","plddt":94.4254,"start":11,"end":51}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N4H5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N4H5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N4H5-F1-predicted_aligned_error_v6.png","plddt_mean":88.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TOMM5","jax_strain_url":"https://www.jax.org/strain/search?query=TOMM5"},"sequence":{"accession":"Q8N4H5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8N4H5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8N4H5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N4H5"}},"corpus_meta":[{"pmid":"25313861","id":"PMC_25313861","title":"A conserved 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before proceeding to a ~100 kDa intermediate and then the mature 400 kDa complex; Tom5 thus acts at an early stage of Tom40 assembly.\",\n      \"method\": \"Blue native PAGE, in vitro import assays, pulse-chase assembly in yeast mutants\",\n      \"journal\": \"Nature structural biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — reconstituted assembly intermediates with defined mutant analysis, multiple orthogonal methods\",\n      \"pmids\": [\"11276259\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Tom5 is required for biogenesis of porin (VDAC) into the mitochondrial outer membrane, acting as part of the GIP complex downstream of Tom20 and Tom22; porin precursor import is inhibited in tom5 mutant mitochondria.\",\n      \"method\": \"In vitro import assays into isolated mitochondria from yeast deletion mutants, assembly assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined import phenotype, multiple substrates tested\",\n      \"pmids\": [\"11266446\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Tom40 and Tom22 form the functional core unit of the GIP complex that stably retains accumulated preproteins; Tom5, Tom6, and Tom7 are peripheral components released under stringent detergent conditions while preprotein remains in the core. The GIP complex exhibits two coupled conductance states corresponding to two channel pores.\",\n      \"method\": \"Biochemical fractionation with urea/salt/detergent treatment, electrophysiology in planar lipid bilayers, preprotein accumulation assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — multiple orthogonal methods including electrophysiology and biochemical dissection\",\n      \"pmids\": [\"11259583\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Tom5 of the GIP complex is crucial for import of small Tim proteins (Tims of the intermembrane space) via a third novel import route where surface receptors (Tom20, Tom70) are dispensable but Tom5 is essential.\",\n      \"method\": \"In vitro import assays into mitochondria from yeast deletion mutants (tom5Δ, tom20Δ, tom70Δ)\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic deletion with specific substrate phenotype, defined pathway placement\",\n      \"pmids\": [\"10397776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Import of bacterial PorB (a VDAC-like β-barrel protein) into the mitochondrial outer membrane depends on Tom5, Tom20, and Tom40 but is independent of Tom70, as shown by in vitro import into mitochondria from yeast deletion mutants.\",\n      \"method\": \"In vitro import assay into isolated yeast mitochondria from deletion mutants\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO import assay with defined substrate, single lab\",\n      \"pmids\": [\"11953311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Bcl-2α insertion into the mitochondrial outer membrane does not require Tom5 or Tom40 (bypasses the GIP), demonstrating that Tom5 is not universally required for all outer membrane protein insertion and that at least two distinct pathways exist from Tom20 to the outer membrane.\",\n      \"method\": \"In vitro import assay into yeast mitochondria from tom5 and tom40 mutants\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic deletion with specific import phenotype; defines pathway by negative result\",\n      \"pmids\": [\"12419260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The C-terminal transmembrane segment (TMS) of yeast Tom5 contains the mitochondrial targeting signal for C-tail-anchored outer membrane proteins; three basic residues in the C-terminal five-residue segment are required for mitochondrial targeting, and appropriate TMS length, proline context, and TMS-C-segment distance are all critical.\",\n      \"method\": \"Deletion/mutation analysis with GFP reporter, confocal microscopy, cell fractionation in COS-7 cells\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — systematic mutagenesis with live imaging and fractionation, multiple mutants tested\",\n      \"pmids\": [\"12006657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Correct targeting and assembly of Tom5 into the TOM complex requires: (i) appropriate TMS length rather than hydrophobicity, (ii) a proline residue at a correct TMS position with specific flanking residues, and (iii) unlike other outer membrane proteins, the positive C-terminal segment is dispensable for Tom5 assembly. A minimal signal (Ser-Pro-Met within Leu-Ala repeats) is sufficient for mitochondrial targeting.\",\n      \"method\": \"In vivo GFP reporter with systematic mutations, blue native PAGE, complementation of temperature-sensitive tom5Δ yeast\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — reconstitution with minimal signal, mutagenesis, functional complementation, multiple orthogonal methods\",\n      \"pmids\": [\"12896971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The cytosolic domain of yeast Tom5 adopts a helical structure: a stable helical core between residues E11 and R15 with a less structurally rigid helix extending to the C-terminus, as determined by CD and NMR spectroscopy.\",\n      \"method\": \"Circular dichroism (CD) spectroscopy, NMR (NOESY)\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — structural determination by NMR, but limited functional validation in this study\",\n      \"pmids\": [\"10683449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Tom5 is not required for cytochrome c import into yeast mitochondria, demonstrating substrate-specific usage of Tom5 within the TOM pathway.\",\n      \"method\": \"In organello import assay in yeast tom5 deletion mutants\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean deletion with specific substrate, single lab\",\n      \"pmids\": [\"12628251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Tom5 is present in Neurospora crassa and maintains structural stability of the TOM complex in yeast: yeast TOM5 deletion alters complex structural stability and reduces import efficiency, whereas Neurospora tom5 deletion does not affect growth or import; Neurospora Tom5 functionally rescues yeast tom5 temperature-sensitive phenotype, and Tom5 traverses the outer membrane with its C-terminus facing the IMS like other small Tom components.\",\n      \"method\": \"Yeast genetics, blue native PAGE, in vitro import assay, cross-species complementation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, cross-species functional complementation, replicated across organisms\",\n      \"pmids\": [\"15701639\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Transport of Taz1 (yeast tafazzin) into mitochondria depends on the receptor Tom5 of the TOM complex and the small Tim proteins of the IMS, but is independent of the SAM complex.\",\n      \"method\": \"In vitro import assay into mitochondria from yeast deletion mutants (tom5Δ)\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with specific substrate, single lab\",\n      \"pmids\": [\"16135531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Tom5, Tom6, Tom7, and Tom22 serve as modulators of Tom40 pore dynamics; purified Tom40 alone does not show transitions between conductance states at low voltages, but the full TOM core complex (containing these additional subunits) significantly reduces the energy barrier between conformational states, enabling proper channel gating.\",\n      \"method\": \"Electrophysiology in planar lipid bilayers with purified Tom40 vs. TOM core complex from Neurospora crassa\",\n      \"journal\": \"Biophysical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with purified components, electrophysiology\",\n      \"pmids\": [\"18456827\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"A Tom5-Tom40 subcomplex of TOM associates with the SAM core complex to form a large SAM complex that binds the α-helical precursor of Tom6 after its Mim1-dependent membrane insertion, placing Tom5 at the SAM stage of TOM biogenesis for α-helical subunit assembly.\",\n      \"method\": \"Co-immunoprecipitation, blue native PAGE, in vitro import assay in yeast deletion mutants\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP, genetic deletion analysis, multiple substrates, single lab with multiple methods\",\n      \"pmids\": [\"20026336\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Tom5 associates with the precursor of Tom40 at the SAM complex to form the second SAM stage intermediate; Tom5-deficient mitochondria and Mim1-deficient mitochondria both accumulate Tom40 at the first SAM stage, and Tom5 overexpression suppresses the Tom40 assembly defect of mim1Δ, demonstrating that Tom5 directly initiates Tom40 assembly at the SAM complex.\",\n      \"method\": \"Blue native PAGE, in vitro import assay, co-immunoprecipitation, yeast genetics with deletion/suppressor analysis\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic suppression epistasis, co-IP, multiple deletion mutants, multiple orthogonal methods\",\n      \"pmids\": [\"20668160\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Tom5 plays a stimulatory role in TOM complex biogenesis at the SAM complex stage that is antagonistic to the inhibitory role of Tom7: Tom7 opposes Tom5 and Tom6 at the early stage of Tom40 assembly at the SAM complex, demonstrating that Tom5 and Tom7 have opposing functions in TOM biogenesis.\",\n      \"method\": \"In vitro import assay, blue native PAGE, yeast genetics with single and double deletions\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with double mutants, multiple orthogonal methods\",\n      \"pmids\": [\"21059357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In yeast, all Emc (ER membrane protein complex) proteins interact with the mitochondrial TOM complex protein Tom5, and this interaction is important for phosphatidylserine transfer from ER to mitochondria and for cell growth; EMC-Tom5 interaction tethers ER to mitochondria at ER-mitochondria contact sites.\",\n      \"method\": \"Co-immunoprecipitation (EMC-Tom5 interaction), genetic screen, phospholipid transfer assay, cell growth assay in EMC/ERMES double mutants\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP, genetic epistasis, functional lipid transfer assay, replicated with rescue experiment\",\n      \"pmids\": [\"25313861\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Cryo-EM structure of the Neurospora crassa TOM core complex at ~10 Å resolution reveals a symmetrical dimer of ten subunits; Tom5, Tom6, and Tom7 surround the Tom40 β-barrel pores with their transmembrane segments, and Tom22 connects the two Tom40 pores at the dimer interface.\",\n      \"method\": \"Cryo-electron microscopy, single-particle reconstruction\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structure determination, first molecular architecture of TOM complex\",\n      \"pmids\": [\"28802041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Cryo-EM structure of the dimeric human TOM core complex at near-atomic resolution shows Tom5, Tom6, and Tom7 surrounding the Tom40 channels with notable configurations; the N-terminal segment of Tom40 spans the channel from cytosol to IMS and interacts with Tom5 at the periphery of the dimer, where downstream components for presequence-lacking preproteins are recruited.\",\n      \"method\": \"Single-particle cryo-EM, atomic model building\",\n      \"journal\": \"Cell discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution cryo-EM structure of human TOM complex with Tom5 position defined\",\n      \"pmids\": [\"33083003\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Tomm5 knockout mice develop cryptogenic organizing pneumonia (COP/BOOP): lungs show widespread intra-alveolar fibrosis with fibroblasts/myofibroblasts in alveolar lumina, macrophage and eosinophil infiltration, with preserved alveolar architecture, while other phenotyping assays were normal, indicating a lung-specific functional role for TOMM5.\",\n      \"method\": \"Knockout mouse generation, histopathology, high-throughput phenotyping\",\n      \"journal\": \"Veterinary pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO with defined pathological phenotype, but mechanistic link to TOM function not directly demonstrated\",\n      \"pmids\": [\"22688586\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The Tom5 transmembrane domain, when fused to p53 (p53-Tom5), targets p53 exclusively to mitochondria in A549 cells and induces mitochondrial dysfunction, membrane potential loss, cytochrome c release, and suppresses cell proliferation, demonstrating the sufficiency of the Tom5 TMS as a mitochondrial targeting signal.\",\n      \"method\": \"Transfection, confocal microscopy, cell proliferation assay, cytochrome c release assay, mitochondrial membrane potential measurement\",\n      \"journal\": \"Biological & pharmaceutical bulletin\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — functional fusion protein experiment with multiple readouts, single lab\",\n      \"pmids\": [\"21467644\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Cryo-EM structure at 3.1 Å of human PINK1 stabilized at an endogenous TOM-VDAC array shows TOM5 facilitates symmetric arrangement of two TOM core complexes around a central VDAC2 dimer; TOM5 also directly binds the PINK1 kinase C-lobe, contributing to PINK1 stabilization at depolarized mitochondria.\",\n      \"method\": \"Single-particle cryo-EM, structural modeling of endogenous complex\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution cryo-EM structure of endogenous complex with direct Tom5-PINK1 interaction defined\",\n      \"pmids\": [\"40080546\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TOMM5 (TOM subunit) is required for PINK1 retention on the mitochondrial surface during PINK1-Parkin-mediated mitophagy; ablation of TOMM5 prevents PINK1 stabilization at mitochondria when mitochondrial membrane potential is lost, placing TOMM5 as a required component of the PINK1-Parkin damage sensing pathway.\",\n      \"method\": \"Genome-wide screen with Parkin reporter, KO validation, mitophagy assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide screen validated by KO with defined pathway placement and mechanistic readout\",\n      \"pmids\": [\"41266657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TOM5 regulates mitochondrial membrane potential in alveolar epithelial cells; TOM5 reduces early apoptosis and promotes cell proliferation in vitro, and TOM5 levels are increased in lung tissues of organizing pneumonia patients correlating with collagen deposition.\",\n      \"method\": \"In vitro cell culture, mitochondrial membrane potential measurement, apoptosis assay, cell proliferation assay\",\n      \"journal\": \"Redox report\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, cellular assays without mechanistic pathway placement\",\n      \"pmids\": [\"38794801\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The HSP90 C-lobe/CTE binding region of PINK1 overlaps with interaction sites for TOM5 and TOM20, suggesting that HSP90-CDC37 chaperone complex and TOM5 compete for the same surface on PINK1 kinase; structural basis for this overlap is provided by cryo-EM of the PINK1-HSP90-CDC37 complex.\",\n      \"method\": \"Cryo-EM structure determination, structural comparison\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 1 method (cryo-EM) but preprint, and TOM5 interaction inferred structurally rather than directly demonstrated in this paper\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Cryo-EM structure of Drosophila TOM complex shows Tom5 as one of four endogenous TOM components co-assembled with Tom40; the Drosophila and human TOM complexes are very similar with small conformational changes at subunit interfaces attributable to lipid-binding residue variation, confirming the conserved structural role of Tom5 across higher eukaryotes.\",\n      \"method\": \"Single-particle cryo-EM at 3.3 Å from Drosophila retina-derived complex\",\n      \"journal\": \"IUCrJ\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structure, but primarily comparative/structural without new functional validation of Tom5 specifically\",\n      \"pmids\": [\"39575538\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TOMM5 is a small tail-anchored subunit of the mitochondrial outer membrane TOM core complex whose C-terminal transmembrane segment (containing a critical proline and basic C-segment) mediates mitochondrial targeting; within the complex, Tom5 surrounds the Tom40 β-barrel pore (as revealed by cryo-EM structures of yeast, Neurospora, human, and Drosophila TOM complexes), acts as an early assembly factor for Tom40 biogenesis at the SAM complex, maintains structural stability of the GIP complex, facilitates transfer of preproteins from receptors to the Tom40 channel for specific substrates (small Tims, porin/VDAC, Taz1, PorB), participates in ER-mitochondria tethering by interacting with the EMC complex to enable phospholipid transfer, directly contacts the PINK1 kinase C-lobe to retain PINK1 at the TOM complex during mitophagy activation, and modulates Tom40 channel gating dynamics; knockout of TOMM5 in mice causes cryptogenic organizing pneumonia and in cells reduces mitochondrial membrane potential and alters apoptosis.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"Tom5 in the yeast TOM complex recognizes the mitochondria-targeting sequence (MTS) of preproteins, functioning as a component of the outer membrane protein translocation machinery that mediates transfer of preproteins from receptors to the Tom40 channel.\",\n      \"method\": \"Biochemical characterization of TOM complex components; reconstitution of preprotein import pathway in yeast\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — biochemical pathway characterization, single review synthesis; replicated across multiple labs\",\n      \"pmids\": [\"9603986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Tom5, Tom6, and Tom7 are small subunits of the ~400 kDa general import pore (GIP) complex of yeast mitochondria, which also contains Tom40 and Tom22. Tom6 promotes stable association of Tom22 with Tom40, and its absence causes dissociation of Tom22 and formation of a ~100 kDa subcomplex containing Tom40, Tom7, and Tom5.\",\n      \"method\": \"Blue native PAGE, co-immunoprecipitation, yeast mutant analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP, native PAGE, genetic mutants; replicated across multiple labs\",\n      \"pmids\": [\"9774667\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Tom5 participates in the assembly of the yeast Tom40 import channel: the Tom40 precursor first assembles with Tom5 to form a ~250 kDa intermediate exposed to the intermembrane space, before progression to the mature ~400 kDa GIP complex.\",\n      \"method\": \"Pulse-chase import assays, native PAGE, sequential assembly intermediate analysis\",\n      \"journal\": \"Nature structural biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — defined assembly intermediates with multiple methods, replicated\",\n      \"pmids\": [\"11276259\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Tom5 is part of the stable TOM GIP core complex together with Tom40 and Tom22. Under stringent detergent conditions, Tom5 (along with Tom20 and other small Toms) is released while preprotein remains in the GIP, indicating Tom5 is not essential for preprotein holding but contributes to complex architecture.\",\n      \"method\": \"Urea/alkaline resistance assays, detergent fractionation, preprotein arrest experiments, electrophysiology\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 — multiple biochemical methods, orthogonal approaches\",\n      \"pmids\": [\"11259583\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Biogenesis of yeast porin (VDAC) depends on Tom5 of the GIP complex, in addition to Tom20, Tom22, and Tom40, as shown by import competition and mutant analysis.\",\n      \"method\": \"In organello import assays, competition assays, yeast mutants lacking individual Tom proteins\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic mutants with defined import readouts, replicated across two organisms\",\n      \"pmids\": [\"11266446\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Import of small Tim proteins of the mitochondrial IMS uses a novel pathway where surface receptors Tom20 and Tom70 are dispensable, but Tom5 of the GIP complex is crucial, defining a third import route.\",\n      \"method\": \"In organello import assays in yeast mutants lacking individual Tom proteins\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic dissection with defined readout, novel route established\",\n      \"pmids\": [\"10397776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Insertion of bacterial porin PorB into the mitochondrial outer membrane in vitro depends on Tom5, Tom20, and Tom40, but is independent of Tom70, demonstrating a shared import mechanism with VDAC.\",\n      \"method\": \"In vitro import assays into isolated mitochondria; antibody inhibition of specific TOM subunits\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro import with defined subunit requirements\",\n      \"pmids\": [\"11953311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Bcl-2alpha insertion into the yeast mitochondrial outer membrane does not require Tom5 or Tom40, demonstrating that Bcl-2alpha bypasses the GIP and follows a pathway distinct from that requiring Tom5.\",\n      \"method\": \"In organello import assays in yeast tom5 and tom40 mutants\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic mutant import assays defining pathway specificity\",\n      \"pmids\": [\"12419260\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Yeast Tom5 is a C-tail-anchored protein; the signal directing it to the mitochondrial outer membrane requires an appropriate TMS length, a proline at a correct position within the TMS, and specific surrounding residues, but (unlike dispersed outer membrane proteins) does not require a positive C-terminal segment.\",\n      \"method\": \"GFP reporter fusions with systematic deletions/mutations, confocal microscopy, cell fractionation, blue native PAGE complementation in tom5-ts yeast\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — systematic mutagenesis with multiple functional readouts\",\n      \"pmids\": [\"12896971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The mitochondrial targeting signal for C-tail-anchored proteins in mammals, using yeast Tom5 as a model in COS-7 cells, requires three basic amino acid residues in the C-terminal five-residue segment and an appropriate TMS length; elongation of TMS or separation of TMS and C-segment impairs targeting.\",\n      \"method\": \"GFP reporter fusions expressed in COS-7 cells, confocal microscopy, cell fractionation\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — systematic mutagenesis with imaging and fractionation\",\n      \"pmids\": [\"12006657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Import of cytochrome c into yeast mitochondria does not require Tom5, Tom6, or Tom7, establishing that these small Tom proteins are dispensable for this particular import pathway.\",\n      \"method\": \"In organello import assays in yeast mutants lacking individual Tom proteins\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic dissection with defined readout\",\n      \"pmids\": [\"12628251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Identification of Neurospora crassa Tom5 as a TOM complex subunit with its C-terminus facing the IMS. In yeast, Tom5 is required for structural stability of the TOM complex and efficient protein import, but Neurospora Tom5 knockout shows no growth or import defect, indicating organism-specific roles. Yeast TOM5 deletion can be rescued by overexpression of Neurospora Tom5.\",\n      \"method\": \"Identification by sequence analysis and biochemistry; tom5 deletion in both yeast and Neurospora; import assays; blue native PAGE; complementation experiments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cross-species genetic analysis with import and structural assays\",\n      \"pmids\": [\"15701639\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Import of yeast Taz1 (tafazzin) into mitochondria depends on the receptor Tom5 of the TOM complex and the small Tim proteins of the IMS, but is independent of the SAM complex.\",\n      \"method\": \"In organello import assays in yeast mutants; submitochondrial fractionation\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genetic mutant import assays defining pathway\",\n      \"pmids\": [\"16135531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The cytosolic domain of yeast TOM5 forms a stable helical structure: CD spectroscopy shows a pH-invariant helical conformation, and NMR NOESY data reveal a stable helical core between residues E11 and R15 with a less rigid helix extending to the C-terminus.\",\n      \"method\": \"Circular dichroism (CD) spectroscopy, NMR (NOESY)\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — structural determination by NMR and CD; single study\",\n      \"pmids\": [\"10683449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"A subcomplex of Tom5 and Tom40 associates with the SAM core complex to form a large SAM complex involved in biogenesis of the alpha-helical Tom6 protein after Mim1-dependent membrane insertion.\",\n      \"method\": \"Blue native PAGE, co-immunoprecipitation, import assays in yeast mutants\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods, genetic mutants, defined assembly intermediates\",\n      \"pmids\": [\"20026336\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Tom5 promotes the second stage of Tom40 assembly at the SAM complex. Mim1-deficient mitochondria accumulate Tom40 at the first SAM stage like Tom5-deficient mitochondria; overexpression of Tom5 suppresses the Tom40 assembly defect of mim1Δ mitochondria, placing Tom5 downstream of Mim1 in the Tom40 biogenesis pathway.\",\n      \"method\": \"Import assays, blue native PAGE, epistasis analysis in yeast mutants\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with defined assembly intermediates\",\n      \"pmids\": [\"20668160\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Tom5 and Tom6 play a stimulatory role in biogenesis of Tom40 at the SAM complex, antagonized by Tom7; Tom5 and Tom6 associate with the Tom40 precursor at an early assembly stage, while Tom7 inhibits this step and additionally promotes dissociation of the SAM-Mdm10 complex.\",\n      \"method\": \"Import assays, blue native PAGE, genetic epistasis in yeast mutants\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic mutants with defined assembly readouts\",\n      \"pmids\": [\"21059357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Tom5 (along with Tom22, Tom7, and Tom6) functions as a modulator of the pore dynamics of Tom40, significantly reducing the energy barrier between different conformational states of the TOM channel.\",\n      \"method\": \"Planar lipid bilayer electrophysiology with purified TOM core complex and Tom40 from Neurospora crassa\",\n      \"journal\": \"Biophysical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution electrophysiology; single study\",\n      \"pmids\": [\"18456827\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Human Tom5 and Tom6 were identified as components of the human TOM complex by immunoisolation from HeLa cells. They associate with Tom40 in the TOM complex. Knockdown of hTom40 decreases levels of all small Tom proteins. Double knockdown of any combination of small Tom proteins (Tom5, Tom6, Tom7) affects matrix import of preproteins.\",\n      \"method\": \"FLAG-immunoisolation of TOM complex from HeLa cells, mass spectrometry identification, siRNA knockdown, import assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP/MS identification, genetic knockdown with functional readout; first identification of human TOMM5\",\n      \"pmids\": [\"18331822\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Yeast Tom5 of the TOM complex interacts with all Emc proteins of the ER membrane protein complex (EMC), and this interaction is important for phosphatidylserine (PS) transfer from the ER to mitochondria and for cell growth, suggesting that the EMC forms an ER-mitochondria tether by associating with the TOM complex through Tom5.\",\n      \"method\": \"Genetic screen, co-immunoprecipitation, lipid transfer assays, growth assays in yeast\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic screen + reciprocal co-IP + functional lipid transfer assays\",\n      \"pmids\": [\"25313861\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Cryo-EM structure of the Neurospora crassa TOM core complex at ~10 Å resolution shows Tom5, Tom6, and Tom7 transmembrane segments surrounding each Tom40 β-barrel pore in the dimeric complex, with Tom22 connecting the two Tom40 pores at the dimer interface.\",\n      \"method\": \"Cryo-electron microscopy, single particle analysis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structure with defined subunit placement\",\n      \"pmids\": [\"28802041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Atomic resolution cryo-EM structure of the dimeric human TOM core complex shows TOMM5, TOMM6, and TOMM7 surrounding the Tom40 channels at the periphery of the dimer; the N-terminal segment of Tom40 spans from cytosol to IMS to interact with Tom5 at the dimer periphery, providing insight into preprotein translocation paths.\",\n      \"method\": \"Single-particle cryo-EM at near-atomic resolution\",\n      \"journal\": \"Cell discovery\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution structure with functional interpretation; replicated by multiple cryo-EM studies\",\n      \"pmids\": [\"33083003\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Tomm5 knockout mice (Tomm5−/−) develop a lung-specific phenotype of cryptogenic organizing pneumonia (COP/BOOP), characterized by intra-alveolar fibrosis with fibroblasts/myofibroblasts in alveolar lumina and eosinophilic inflammation, while other organ systems appear normal.\",\n      \"method\": \"Knockout mouse model; histopathology\",\n      \"journal\": \"Veterinary pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — defined KO phenotype but mechanism not fully elucidated\",\n      \"pmids\": [\"22688586\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TOMM5 regulates mitochondrial membrane potential in alveolar epithelial cells. In a bleomycin-induced murine model of organizing pneumonia, TOMM5 levels increase with lung fibrosis. In vitro, TOMM5 reduces the proportion of early apoptotic cells and promotes cell proliferation.\",\n      \"method\": \"In vitro knockdown/overexpression in alveolar epithelial cells; mitochondrial membrane potential assays; flow cytometry for apoptosis; bleomycin mouse model\",\n      \"journal\": \"Redox report\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — defined cellular phenotypes with functional assays, single study\",\n      \"pmids\": [\"38794801\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Cryo-EM structure of human PINK1 at a TOM-VDAC array shows that TOM5 participates in symmetric arrangement of two TOM core complexes around a central VDAC2 dimer, and that TOM5 binds the PINK1 kinase C-lobe, stabilizing PINK1 at the TOM complex during mitophagy.\",\n      \"method\": \"Single-particle cryo-EM at 3.1 Å resolution of endogenous TOM-VDAC complex; structural analysis of PINK1 interaction\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution cryo-EM structure with defined protein interactions\",\n      \"pmids\": [\"40080546\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TOMM5 (as a TOM complex subunit) is required for PINK1 retention on the mitochondrial surface during mitophagy. Ablation of TOM (including TOMM5) prevents PINK1 accumulation at the outer membrane when membrane potential is lost, establishing TOM as the platform for PINK1 stabilization.\",\n      \"method\": \"Genome-wide CRISPR screen with novel Parkin reporter; genetic ablation of TOM subunits; PINK1 import/retention assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR screen + functional import/retention assays; single study\",\n      \"pmids\": [\"41266657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The HSP90-CDC37 chaperone complex holds PINK1 in a partially unfolded state; the C-terminal extension (CTE) of PINK1 is covered by HSP90 in a region that overlaps with the TOM5 and TOM20 interaction sites, suggesting that chaperone release is coupled to TOM engagement for PINK1 import/stabilization.\",\n      \"method\": \"Cryo-EM structure of human PINK1-HSP90-CDC37 complex\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 1 method but preprint; TOM5 interaction is structural inference\",\n      \"pmids\": [\"bio_10.1101_2025.10.17.682828\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The Drosophila TOM complex cryo-EM structure at 3.3 Å shows Tom5 as one of four endogenous TOM components co-assembled with Tom40, confirming evolutionary conservation of Tom5's position surrounding the Tom40 β-barrel. Small conformational differences at subunit interfaces relative to human TOM are attributable to lipid-binding residue variation.\",\n      \"method\": \"Single-particle cryo-EM of ex vivo Drosophila TOM complex\",\n      \"journal\": \"IUCrJ\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution structure confirming conserved subunit architecture\",\n      \"pmids\": [\"39575538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"A CTCF-mediated insulator loop encompassing the TOMM5 gene resides between synthetically interacting genetic elements of the breast cancer susceptibility locus MCS5A/Mcs5a, suggesting TOMM5 is located within a higher-order chromatin structure relevant to locus regulation.\",\n      \"method\": \"CTCF ChIP, chromatin conformation capture (3C), transgenic rat models\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — localization/regulatory context but no direct mechanistic finding about TOMM5 protein function\",\n      \"pmids\": [\"21914726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Proapoptotic fusion protein p53-Tom5, in which wild-type p53 is fused to the mitochondrial transmembrane domain of Tom5, exclusively localizes to mitochondria in ARF-null A549 lung cancer cells, induces mitochondrial dysfunction and cytochrome c release, and suppresses cell proliferation — effects not seen with wild-type p53 alone.\",\n      \"method\": \"Plasmid transfection; confocal microscopy localization; cell proliferation assays; cytochrome c release assay\",\n      \"journal\": \"Biological & pharmaceutical bulletin\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single study using artificial fusion protein to deliver p53 to mitochondria via Tom5 TMS\",\n      \"pmids\": [\"21467644\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TOMM5 (Tom5) is a small C-tail-anchored subunit of the translocase of the outer mitochondrial membrane (TOM) complex whose C-terminus faces the intermembrane space; it participates in the structural stability of the ~400 kDa GIP complex, facilitates transfer of preproteins from surface receptors to the Tom40 channel, acts as an assembly factor that promotes the second SAM-stage interaction during Tom40 biogenesis, forms part of the ER-mitochondria tether by interacting with EMC proteins, surrounds the Tom40 β-barrel in the dimeric TOM core complex as revealed by cryo-EM structures in Neurospora, yeast, human, and Drosophila, and is required for PINK1 retention at the outer membrane during PINK1-Parkin-mediated mitophagy, with TOMM5 deficiency in mice causing cryptogenic organizing pneumonia linked to mitochondrial membrane potential dysregulation in alveolar epithelial cells.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TOMM5 encodes a small tail-anchored subunit of the mitochondrial outer membrane translocase (TOM) complex that functions in protein import, complex biogenesis, organelle tethering, and mitophagy signaling. Within the TOM core complex, Tom5 surrounds the Tom40 β-barrel pore and modulates its channel gating dynamics, facilitating transfer of specific preproteins—including small Tim proteins, porin/VDAC, and Taz1—from surface receptors to the import channel [PMID:9774667, PMID:10397776, PMID:18456827]. Tom5 also serves as an early assembly factor for Tom40 biogenesis at the SAM complex, where it initiates formation of the second SAM-stage intermediate in a role antagonistic to Tom7, and interacts with the ER membrane protein complex (EMC) to tether ER and mitochondria for phospholipid transfer [PMID:20668160, PMID:21059357, PMID:25313861]. High-resolution cryo-EM structures confirm that Tom5 directly contacts the PINK1 kinase C-lobe, retaining PINK1 at depolarized mitochondria to activate Parkin-mediated mitophagy, and Tomm5 knockout in mice causes cryptogenic organizing pneumonia [PMID:40080546, PMID:41266657, PMID:22688586].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Establishing Tom5 as a stable subunit of the GIP/TOM core complex resolved its position within the protein import machinery: Tom5 sits downstream of the Tom20/Tom70 receptors and directly associates with Tom40 and Tom22 in the ~400 kDa pore complex.\",\n      \"evidence\": \"Blue native PAGE, co-immunoprecipitation, and yeast deletion mutants\",\n      \"pmids\": [\"9774667\", \"9603986\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Which preprotein substrates specifically require Tom5 versus bypass it\",\n        \"Structural position of Tom5 relative to Tom40 pore was unknown\",\n        \"Mechanism by which Tom5 facilitates preprotein transfer was undefined\"\n      ]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Discovery that small Tim proteins require Tom5 but not Tom20/Tom70 for import revealed a third, receptor-independent import route through the TOM complex, establishing substrate-specific roles for Tom5.\",\n      \"evidence\": \"In vitro import assays into mitochondria from yeast tom5Δ, tom20Δ, and tom70Δ mutants\",\n      \"pmids\": [\"10397776\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis for Tom5-dependent recognition of small Tims was unknown\",\n        \"Whether this route exists in mammalian cells was untested\"\n      ]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstration that Tom40 precursor first assembles with Tom5 to form a ~250 kDa intermediate established Tom5 as an early biogenesis factor rather than merely a structural component of the mature complex.\",\n      \"evidence\": \"Blue native PAGE, in vitro import, pulse-chase assembly in yeast mutants\",\n      \"pmids\": [\"11276259\", \"11266446\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Identity of the assembly chaperone or machinery mediating Tom5–Tom40 association\",\n        \"Whether Tom5's biogenesis and import roles are mechanistically separable\"\n      ]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Mapping the mitochondrial targeting signal of Tom5 to its C-terminal transmembrane segment, with critical dependence on basic C-terminal residues, TMS length, and a conserved proline, defined the targeting logic for tail-anchored outer membrane proteins.\",\n      \"evidence\": \"Systematic mutagenesis with GFP reporter, confocal microscopy, and cell fractionation in COS-7 cells\",\n      \"pmids\": [\"12006657\", \"12896971\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Receptor or insertion machinery for tail-anchored proteins at the outer membrane was unidentified\",\n        \"Whether the minimal targeting signal functions identically in yeast and mammals\"\n      ]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Electrophysiology of purified Tom40 alone versus the complete TOM core complex revealed that Tom5, Tom6, Tom7, and Tom22 collectively modulate channel gating by reducing energy barriers between conductance states, assigning a biophysical function to the small Tom subunits.\",\n      \"evidence\": \"Planar lipid bilayer electrophysiology with purified Neurospora crassa components\",\n      \"pmids\": [\"18456827\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Individual contribution of Tom5 versus Tom6/Tom7 to gating modulation was not resolved\",\n        \"How gating dynamics relate to substrate translocation in vivo\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Genetic epistasis showing that Tom5 initiates Tom40 assembly at the SAM complex in opposition to Tom7's inhibitory role resolved the antagonistic regulatory logic governing TOM complex biogenesis.\",\n      \"evidence\": \"Blue native PAGE, co-IP, yeast genetics with single/double deletions and suppressor analysis\",\n      \"pmids\": [\"20668160\", \"21059357\", \"20026336\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Direct structural interaction between Tom5 and SAM subunits was not demonstrated\",\n        \"How the opposing activities of Tom5 and Tom7 are regulated\"\n      ]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Tomm5 knockout mice developing cryptogenic organizing pneumonia with intra-alveolar fibrosis provided the first in vivo mammalian phenotype, suggesting a tissue-specific dependency on Tom5 function.\",\n      \"evidence\": \"Knockout mouse histopathology and high-throughput phenotyping\",\n      \"pmids\": [\"22688586\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanistic link between TOM complex dysfunction and lung fibrosis was not established\",\n        \"Whether the phenotype reflects impaired import, mitophagy, or lipid transfer\",\n        \"Not independently replicated\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Discovery that all EMC subunits interact with Tom5 to tether ER to mitochondria for phosphatidylserine transfer expanded Tom5's role beyond protein import to inter-organelle lipid homeostasis.\",\n      \"evidence\": \"Co-immunoprecipitation, genetic epistasis with EMC/ERMES double mutants, phospholipid transfer assay in yeast\",\n      \"pmids\": [\"25313861\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether Tom5–EMC interaction is direct or mediated by other factors\",\n        \"Which domain of Tom5 mediates EMC binding\",\n        \"Conservation of this tethering function in mammalian cells\"\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"The first cryo-EM structure of the TOM core complex confirmed that Tom5 transmembrane segments surround the Tom40 β-barrel, providing the molecular framework for all prior biochemical observations.\",\n      \"evidence\": \"Cryo-EM single-particle reconstruction of Neurospora crassa TOM complex at ~10 Å\",\n      \"pmids\": [\"28802041\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Resolution insufficient for side-chain interactions\",\n        \"Mammalian TOM structure not yet available\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Near-atomic cryo-EM of the human TOM complex placed Tom5 at the periphery where the Tom40 N-terminal segment exits, suggesting Tom5 participates in routing presequence-lacking preproteins to downstream pathways.\",\n      \"evidence\": \"Single-particle cryo-EM and atomic model building of human TOM core complex\",\n      \"pmids\": [\"33083003\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Functional validation of the proposed substrate routing role at atomic level was not performed\",\n        \"Dynamics of Tom5 position during active translocation unknown\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"High-resolution cryo-EM of PINK1 stabilized at an endogenous TOM-VDAC array revealed direct Tom5–PINK1 C-lobe contact, and genome-wide screening confirmed TOMM5 is required for PINK1 retention during mitophagy, establishing a new function in damage signaling.\",\n      \"evidence\": \"Cryo-EM at 3.1 Å of endogenous human TOM-PINK1-VDAC complex; genome-wide Parkin reporter screen with KO validation\",\n      \"pmids\": [\"40080546\", \"41266657\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether Tom5–PINK1 interaction is regulated by phosphorylation or other modifications\",\n        \"Relative contribution of Tom5 versus Tom20 to PINK1 retention\",\n        \"Whether HSP90-CDC37 and Tom5 competition for PINK1 is physiologically regulated\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown how Tom5's multiple functions—protein import, Tom40 biogenesis, ER-mitochondria tethering, channel gating, and PINK1 retention—are coordinated, whether they involve distinct Tom5 pools, and what regulates the switch between these roles.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No post-translational modifications of Tom5 identified that could regulate functional switching\",\n        \"Stoichiometry of Tom5 across different functional complexes (TOM, SAM, EMC-TOM, TOM-PINK1) not determined\",\n        \"Mechanistic basis for the lung-specific phenotype in Tomm5 knockout mice remains unexplained\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 3, 5, 6, 14]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [1, 4, 12, 19, 20]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [14, 17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [1, 8, 9, 19, 20, 23]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [8, 19, 20]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 2, 3, 5, 6, 15, 16]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [2, 16, 17]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [23, 24]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [23, 24]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [18]}\n    ],\n    \"complexes\": [\n      \"TOM core complex (GIP)\",\n      \"SAM-Tom5-Tom40 assembly intermediate\",\n      \"TOM-PINK1-VDAC supercomplex\"\n    ],\n    \"partners\": [\n      \"TOMM40\",\n      \"TOMM22\",\n      \"TOMM6\",\n      \"TOMM7\",\n      \"PINK1\",\n      \"VDAC2\",\n      \"EMC1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"TOMM5 is a small, C-tail-anchored subunit of the translocase of the outer mitochondrial membrane (TOM) complex that contributes to the structural integrity of the general import pore (GIP) and facilitates preprotein transfer from surface receptors to the Tom40 translocation channel [PMID:9774667, PMID:10397776]. Its transmembrane segment surrounds the Tom40 β-barrel in the dimeric TOM core complex, as demonstrated by cryo-EM structures across fungi, Drosophila, and humans [PMID:28802041, PMID:33083003, PMID:39575538]. TOMM5 acts as an assembly factor that promotes Tom40 biogenesis at the SAM complex, interacts with EMC proteins to form an ER–mitochondria tether important for phosphatidylserine transfer, and stabilizes PINK1 at the outer membrane during PINK1-Parkin-mediated mitophagy [PMID:20668160, PMID:25313861, PMID:40080546]. Tomm5-knockout mice develop cryptogenic organizing pneumonia, linked to dysregulated mitochondrial membrane potential in alveolar epithelial cells [PMID:22688586, PMID:38794801].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Establishing Tom5 as a core subunit of the TOM GIP complex resolved the identity of the small proteins surrounding Tom40 and showed Tom5 participates in preprotein transfer from receptors to the channel.\",\n      \"evidence\": \"Biochemical characterization, blue native PAGE, co-immunoprecipitation, and yeast mutant analysis of TOM complex components\",\n      \"pmids\": [\"9603986\", \"9774667\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise binding site on Tom40 unknown\", \"Contribution of Tom5 versus other small Toms not individually resolved\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Demonstration that Tom5 is essential for import of small Tim IMS proteins—but dispensable for cytochrome c import—defined substrate-selective roles within the GIP complex.\",\n      \"evidence\": \"In organello import assays in yeast mutants lacking individual Tom proteins\",\n      \"pmids\": [\"10397776\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of selectivity at Tom5 not structurally resolved\", \"Whether selectivity is conserved in mammals unknown\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Identification of a Tom5-containing ~250 kDa assembly intermediate showed that Tom5 participates early in Tom40 biogenesis, prior to formation of the mature GIP.\",\n      \"evidence\": \"Pulse-chase import assays with native PAGE in yeast\",\n      \"pmids\": [\"11276259\", \"11259583\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Order of small Tom association during assembly not fully kinetically resolved\", \"Role of lipid environment in assembly intermediate formation unclear\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Systematic mutagenesis of the Tom5 C-tail anchor defined the targeting determinants (TMS length, internal proline, charged C-terminal residues) for outer membrane insertion of C-tail-anchored mitochondrial proteins.\",\n      \"evidence\": \"GFP fusions with systematic deletions/mutations expressed in yeast and mammalian COS-7 cells; confocal microscopy and fractionation\",\n      \"pmids\": [\"12896971\", \"12006657\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor or insertase for Tom5 biogenesis not identified\", \"Whether MIM/Mim1 pathway inserts Tom5 itself not tested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identification of human TOMM5 and TOMM6 as bona fide TOM complex subunits, and demonstration that combinatorial knockdown of small Tom proteins impairs matrix import, extended the functional framework from yeast to humans.\",\n      \"evidence\": \"FLAG-immunoisolation and mass spectrometry from HeLa cells; siRNA double knockdowns with import assays\",\n      \"pmids\": [\"18331822\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Individual contribution of human TOMM5 versus TOMM6/TOMM7 not separately quantified\", \"Human assembly intermediates not characterized\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Genetic epistasis showed Tom5 acts downstream of Mim1 to promote the second SAM-stage interaction during Tom40 biogenesis, and that Tom5/Tom6 stimulate while Tom7 antagonizes this step, revealing opposing modulatory roles of the small Toms.\",\n      \"evidence\": \"Blue native PAGE, import assays, epistasis analysis in yeast single and double mutants\",\n      \"pmids\": [\"20668160\", \"21059357\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct structural contacts between Tom5 and SAM complex not resolved\", \"Mechanism by which Tom7 opposes Tom5 function unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Tomm5-knockout mice developed lung-specific cryptogenic organizing pneumonia, establishing the first in vivo mammalian phenotype and suggesting a tissue-selective role for TOMM5 in alveolar homeostasis.\",\n      \"evidence\": \"Knockout mouse model with histopathology\",\n      \"pmids\": [\"22688586\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism linking TOMM5 loss to pneumonia not established\", \"Import defects in alveolar cells not directly measured\", \"Single mouse model without independent replication\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Discovery that Tom5 interacts with all EMC subunits and that this interaction mediates phosphatidylserine transfer from ER to mitochondria revealed a non-canonical tethering function for a TOM subunit at ER–mitochondria contact sites.\",\n      \"evidence\": \"Genetic screen, reciprocal co-immunoprecipitation, lipid transfer assays, and growth assays in yeast\",\n      \"pmids\": [\"25313861\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the EMC-Tom5 tether is conserved in mammals not tested\", \"Structural basis of Tom5–EMC interaction unknown\", \"Relative contribution to total ER–mitochondria PS flux unclear\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Atomic-resolution cryo-EM structures of the human and Neurospora TOM core complexes placed TOMM5 at the periphery of the Tom40 β-barrel and showed the Tom40 N-terminal segment contacts Tom5 at the IMS face, providing a structural rationale for preprotein hand-off.\",\n      \"evidence\": \"Single-particle cryo-EM at near-atomic resolution\",\n      \"pmids\": [\"33083003\", \"28802041\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dynamics of Tom5 during active translocation not captured\", \"Lipid interactions at the Tom5–Tom40 interface not fully modeled\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Functional studies in alveolar epithelial cells showed that TOMM5 regulates mitochondrial membrane potential, suppresses early apoptosis, and promotes proliferation, mechanistically linking TOMM5 to the organizing pneumonia phenotype observed in knockout mice.\",\n      \"evidence\": \"In vitro knockdown/overexpression with membrane potential assays, flow cytometry for apoptosis, and bleomycin mouse model\",\n      \"pmids\": [\"38794801\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether membrane potential effect is direct or secondary to import defects not resolved\", \"Specific import substrates affected in alveolar cells unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"High-resolution cryo-EM of PINK1 at a TOM-VDAC array showed TOMM5 directly contacts the PINK1 kinase C-lobe, and genetic ablation confirmed the TOM complex is required for PINK1 retention during mitophagy, establishing a direct structural role for TOMM5 in the PINK1-Parkin pathway.\",\n      \"evidence\": \"Cryo-EM at 3.1 Å of endogenous TOM-VDAC complex (Science); CRISPR screen and genetic ablation with PINK1 retention assays (EMBO J); Drosophila cryo-EM confirming conserved Tom5 architecture (IUCrJ)\",\n      \"pmids\": [\"40080546\", \"41266657\", \"39575538\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TOMM5 loss alone (versus full TOM ablation) is sufficient to prevent PINK1 retention not individually tested\", \"How TOMM5–PINK1 interaction is regulated by membrane potential not known\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key open questions include: whether the Tom5–EMC tethering function is conserved in mammals; the structural basis for substrate selectivity at the Tom5 stage of import; and how TOMM5-dependent PINK1 stabilization is coordinated with chaperone release and membrane potential sensing.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No mammalian EMC–TOMM5 interaction data\", \"No time-resolved structure of translocation through Tom5-containing pore\", \"Individual TOMM5 knockout in human cells for PINK1 pathway not reported\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [1, 3, 11, 20, 21]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 5, 19]},\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 5, 18]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [1, 8, 9, 18, 20, 21, 24, 27]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0009536\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 2, 5, 15, 18]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [2, 15, 16]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [2, 14, 15, 16, 20, 21]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [24, 25]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [19]}\n    ],\n    \"complexes\": [\n      \"TOM complex (GIP/TOM core)\",\n      \"SAM-Tom5-Tom40 assembly intermediate\"\n    ],\n    \"partners\": [\n      \"TOMM40\",\n      \"TOMM22\",\n      \"TOMM6\",\n      \"TOMM7\",\n      \"PINK1\",\n      \"VDAC2\",\n      \"EMC1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}