| 1998 |
Tom6 (yeast) functions as an assembly factor for Tom22, promoting its stable association with Tom40 within the ~400 kDa general import pore (GIP) complex of the outer mitochondrial membrane. In tom6Δ mitochondria, the Tom22–Tom40 interaction is destabilized, releasing Tom22 and generating a ~100 kDa subcomplex of Tom40, Tom7, and Tom5. |
Yeast genetics (tom6Δ mutant), Blue-native PAGE, co-immunoprecipitation, biochemical fractionation of mitochondrial outer membrane complexes |
Molecular and cellular biology |
High |
9774667
|
| 1996 |
Tom6 and Tom7 perform complementary and opposing functions in modulating TOM complex dynamics: Tom6 stabilizes the interaction between Tom22 and Tom40, whereas Tom7 exerts a destabilizing effect. Double-mutant (tom7Δ tom6Δ) synthetic growth defects provided genetic evidence for their functional relationship. |
Yeast genetics (single and double deletion mutants), co-immunoprecipitation, import assays with radiolabeled preproteins, in organello cross-linking |
The EMBO journal |
High |
8641278
|
| 1999 |
The TOM core complex of Neurospora crassa, consisting of Tom40, Tom22, Tom6, and Tom7, was isolated and shown to contain high-conductance channels forming two open pores (~2.1 nm diameter) as determined by electron tomography 3D reconstruction. The complex binds preproteins in a targeting sequence-dependent manner. |
Detergent solubilization/purification, electrophysiology (planar lipid bilayer), electron tomography, 3D reconstruction, preprotein-binding assays |
The Journal of cell biology |
High |
10579717
|
| 2001 |
During TOM complex assembly, Tom6 associates with the 100 kDa Tom40 intermediate (after Tom5 joins the 250 kDa intermediate), and maturation to the 400 kDa complex then occurs by association of Tom7 and Tom22. Tom6 thus acts at a specific sequential step in the assembly pathway. |
In vitro import assays with radiolabeled precursors, Blue-native PAGE, antibody-shift experiments, yeast mutant mitochondria |
Nature structural biology |
High |
11276259
|
| 2001 |
In Neurospora crassa, Tom6 is in direct contact with Tom40 (shown by cross-linking) and interacts with Tom22 in a preprotein-dependent manner. The targeting and assembly information for Tom6 resides in its transmembrane segment and an adjacent N-terminal cytosolic flanking segment. |
Cross-linking, in vitro import/assembly assays, domain-swap hybrid constructs, competition assays |
The Journal of biological chemistry |
High |
11278536
|
| 2001 |
Tom40 and Tom22 together form the functional core unit of the GIP complex that stably retains preproteins; Tom6 (along with Tom5 and Tom7) is released under stringent detergent conditions while the preprotein remains, indicating Tom6 stabilizes the complex but is not the primary preprotein-binding component. The GIP complex exhibits two coupled channel activities corresponding to two simultaneously active Tom40 pores. |
Urea/alkaline resistance assays, detergent titration, electrophysiology (TOM channel activity), outer membrane vesicle import assays |
Molecular and cellular biology |
High |
11259583
|
| 2009 |
Tom6 genetically interacts with SAM complex component Sam37: overexpression of Tom6 suppresses sam37Δ growth defects, and the double mutant (tom6Δ sam37Δ) is inviable. This suppression is linked to Tom6's capacity to stabilize the essential beta-barrel protein Tom40. |
Multicopy suppressor screen, yeast genetics (deletion mutants, double knockouts), growth assays, BN-PAGE |
Molecular and cellular biology |
High |
19797086
|
| 2009 |
The SAM complex forms two distinct large complexes with different functions in biogenesis of alpha-helical Tom proteins: a SAM-Tom5/Tom40 complex that binds the Tom6 precursor after Mim1-dependent insertion into the outer membrane, and a SAM-Mdm10 complex that handles Tom22. Tom6 assembly thus depends on prior Mim1-mediated membrane insertion. |
Co-immunoprecipitation, BN-PAGE, in vitro import assays, yeast deletion mutants |
Journal of molecular biology |
High |
20026336
|
| 2010 |
Tom6 plays a stimulatory role (opposite to Tom7's inhibitory role) at an early stage of Tom40 assembly at the SAM complex. Tom5 and Tom6 together promote formation of the mature TOM complex, while Tom7 antagonizes this process at two distinct assembly steps. |
In vitro assembly assays, BN-PAGE, yeast deletion mutants, co-immunoprecipitation |
Journal of molecular biology |
High |
21059357
|
| 2014 |
The cytosolic precursor of Tom6 is phosphorylated by cyclin Clb3-activated Cdk1 during mitosis, enhancing import of Tom6 into mitochondria. Tom6 phosphorylation promotes assembly of Tom40 into the TOM complex and import of fusion proteins, thereby stimulating respiratory activity of mitochondria in a cell cycle-specific manner. |
Kinase assays (Cdk1 phosphorylation of Tom6 precursor in vitro and in vivo), phosphomimetic/phosphodeficient mutants, import assays, BN-PAGE, respiratory activity measurements |
Science (New York, N.Y.) |
High |
25378463
|
| 2008 |
Tom22, Tom7, Tom6, and Tom5 act as modulators of Tom40 pore dynamics: purified Tom40 alone shows gating only at high voltages, but the intact TOM core complex containing these small subunits significantly reduces the energy barrier between conformational states, enabling proper channel dynamics at physiological voltages. |
Planar lipid bilayer electrophysiology, single-channel recordings, purified TOM core complex vs. isolated Tom40 |
Biophysical journal |
High |
18456827
|
| 2017 |
Cryo-EM structure of the Neurospora crassa TOM core complex at ~10 Å shows a symmetrical dimer of ten membrane protein subunits. Tom6 (together with Tom5 and Tom7) surrounds each Tom40 beta-barrel pore as transmembrane alpha-helical subunits; Tom22 connects the two Tom40 pores at the dimer interface. |
Single-particle cryo-electron microscopy, 3D reconstruction |
Cell |
High |
28802041
|
| 2020 |
Atomic-resolution cryo-EM structure of the dimeric human TOM core complex (TOM-CC) shows that Tom6 (along with Tom5 and Tom7) surrounds the Tom40 beta-barrel channels in notable configurations. The complex has pronounced negative electrostatic features inside the channel and positive regions at the IMS periphery relevant to preprotein translocation. |
Single-particle cryo-EM, atomic model building |
Cell discovery |
High |
33083003
|
| 2008 |
Human Tom5 and Tom6 were identified as components of the human TOM complex by immunoisolation of the TOM complex from HeLa cells expressing hTom22-FLAG followed by mass spectrometry. Human Tom6 is associated with Tom40. Knockdown of hTom40 decreases Tom6 levels; double knockdown of small Tom proteins (including Tom6) impairs preprotein import into the matrix. |
Immunoisolation (FLAG co-IP), mass spectrometry, siRNA knockdown, import assays, BN-PAGE |
Biochemical and biophysical research communications |
High |
18331822
|
| 2019 |
Cell-cycle-dependent variation of phosphorylated Tom6 modulates the ratio of trimeric (Tom22-containing) to dimeric TOM complex: phosphorylated Tom6 promotes Tom22 integration into the trimeric TOM complex, and Por1 sequesters monomeric Tom22 that dissociates from the trimer, facilitating formation of the dimeric TOM complex preferred for import of TIM40/MIA-dependent proteins. |
Yeast genetics, co-immunoprecipitation, BN-PAGE, phosphomimetic/phosphodeficient Tom6 mutants, in vitro import assays |
Molecular cell |
High |
30738703
|
| 2011 |
Tom6 facilitates the mitochondrial localization of specific mRNAs encoding mitochondrial proteins: deletion of TOM6 (tom6Δ) caused mislocalization of OXA1 mRNA (but not ATP2 mRNA) from mitochondria in yeast, establishing a role for this outer membrane translocase subunit in mRNA targeting. |
Live-cell fluorescence imaging of endogenously expressed mRNA reporters, quantitative colocalization analysis in deletion mutant strains |
RNA (New York, N.Y.) |
Medium |
21705432
|
| 2025 |
PP2A (with regulatory subunit Cdc55) dephosphorylates Ser16 of Tom6 in vitro. Synthetic trap-peptides mimicking phospho-Tom6 enriched PP2A and PP4 as full holoenzymes from yeast cytosolic fractions, with PP2A–Cdc55 identified as the first phosphatase of the TOM complex. |
Synthetic trap-peptide pulldown from yeast cytosol, mass spectrometry identification of phosphatases, in vitro dephosphorylation assay with purified PP2A |
The FEBS journal |
High |
40891445
|
| 2024 |
Cryo-EM structure of the human TOM holo complex (~6 Å resolution) reveals a single Tom20 subunit positioned at the center of the complex, stabilized by extensive interactions with Tom22, Tom40, and Tom6. Tom6 thus contributes to docking the Tom20 receptor in the holo complex. |
Chemical cross-linking to stabilize Tom20, single-particle cryo-EM |
PNAS nexus |
Medium |
39071881
|
| 2025 |
Cryo-EM structure of the Drosophila melanogaster TOM complex (3.3 Å) shows Tom6 assembled as an endogenous subunit surrounding the Tom40 beta-barrel, with the Drosophila TOM architecture very similar to the human complex but with small conformational differences at subunit interfaces attributable to variation in lipid-binding residues. |
Single-particle cryo-EM, 3.3 Å molecular model from ex vivo Drosophila retinal TOM complex |
IUCrJ |
High |
39575538
|
| 2025 |
In a mouse model of Alzheimer's disease, aggregated phospho-S670-GRK2 triggers aggregation of TOMM6 (human TOM6) and promotes mitochondrial dysfunction. Neuron-specific restoration of TOMM6 expression reduces beta-amyloid plaques but increases soluble beta-amyloid and mortality, indicating TOMM6 participates in mitochondrial quality control pathways relevant to neurodegeneration. |
Transgenic mouse models, Western blot for TOMM6 aggregation, neuron-specific TOMM6 overexpression, beta-amyloid quantification, survival analysis |
Cell reports. Medicine |
Medium |
41895286
|
| 2025 |
NF-κB directly upregulates TOM6 transcription during vascular calcification; TOM6 knockdown attenuates calcification while TOM6 overexpression exacerbates it. Mechanistically, elevated TOM6 impairs PINK1/Parkin-mediated mitophagy and mitochondrial bioenergetics. Luteolin binds IKKα/IKKβ to inhibit NF-κB, suppressing TOM6 transcription and restoring mitophagy. |
siRNA knockdown and overexpression in VSMCs, in vivo VitD3-overload and CKD rat/mouse models, RNA sequencing, molecular docking (luteolin-IKK binding), mitophagy assays, Western blot for PINK1/Parkin pathway |
European journal of pharmacology |
Medium |
41232657
|