| 1998 |
Tom5 is a component of the general import pore (GIP) complex of the TOM translocase, where it participates in preprotein transfer from surface receptors (Tom20, Tom70) to the channel protein Tom40. The GIP complex (~400 kDa) contains Tom40, Tom22, Tom5, Tom6, and Tom7. |
Biochemical fractionation, native PAGE, immunoprecipitation, yeast genetics |
Molecular and cellular biology |
High |
9603986 9774667
|
| 2001 |
Tom5 associates with the precursor of Tom40 during the first assembly intermediate (~250 kDa) at the sorting and assembly machinery (SAM complex), forming a step prior to the 100 kDa and 400 kDa mature TOM complex. Tom5 is required for progression of Tom40 assembly from the SAM complex to the mature TOM complex. |
Pulse-chase assembly assays, native PAGE, yeast mutant analysis |
Nature structural biology |
High |
11276259
|
| 2001 |
The Tom40-Tom22 core is the stable unit retaining preproteins in the GIP complex; Tom5 (along with Tom6 and Tom7) is released under stringent detergent conditions while preprotein remains bound, indicating Tom5 is a peripheral/modulatory component rather than part of the core translocation unit. |
Urea/detergent dissociation assays, native PAGE, channel activity reconstitution |
Molecular and cellular biology |
High |
11259583
|
| 2001 |
Tom5 is required for the import and assembly of porin (VDAC) into the mitochondrial outer membrane, as shown by reduced import in tom5 mutant mitochondria. Porin biogenesis requires Tom5 in addition to Tom20, Tom22, Tom40, and Tom7. |
In vitro import assay with yeast tom5 mutant mitochondria |
The Journal of cell biology |
Medium |
11266446
|
| 1999 |
Tom5 of the GIP complex is crucial for the import of small Tim proteins of the intermembrane space, representing a third novel import pathway in which surface receptors (Tom20, Tom70) are dispensable but Tom5 is essential. |
In vitro import assays using yeast strains lacking individual TOM components |
Molecular biology of the cell |
Medium |
10397776
|
| 2002 |
Tom5 is required for import of bacterial PorB (a VDAC-like beta-barrel protein) into the mitochondrial outer membrane in vitro; insertion is dependent on Tom5, Tom20, and Tom40 but independent of Tom70. |
In vitro import assay into isolated mitochondria with antibody inhibition of specific TOM subunits |
The EMBO journal |
Medium |
11953311
|
| 2002 |
The transmembrane segment (TMS) length, proline residue position in the TMS, and positive charges in the C-terminal segment (C-segment) together constitute the mitochondrial targeting signal of Tom5 as a C-tail-anchored protein. Reduction of net positive charge in the C-segment causes mislocalization to intracellular membranes; elongation of the TMS or separation of TMS and C-segment impairs targeting. |
Systematic deletion/mutation analysis of Tom5 TMS and flanking regions with GFP reporter, confocal microscopy, cell fractionation in COS-7 cells |
Molecular biology of the cell |
High |
12006657
|
| 2003 |
Correct targeting and assembly of Tom5 into the TOM complex requires an appropriate TMS length (not merely hydrophobicity), a proline residue at the correct position in the TMS with specific flanking residues, but unlike other C-tail-anchored outer membrane proteins, does not require positive charges in the C-terminal segment. A minimal targeting signal (Ser-Pro-Met in Leu-Ala repeat context) is sufficient for mitochondrial targeting and functional complementation. |
In vivo GFP reporter assays, blue native PAGE, complementation of temperature-sensitive deltaTOM5 yeast cells |
The Journal of biological chemistry |
High |
12896971
|
| 2000 |
The cytosolic domain of Tom5 forms 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. |
Circular dichroism (CD) and NMR (NOESY) spectroscopy |
FEBS letters |
Medium |
10683449
|
| 2005 |
Tom5 is required for maintaining the structural integrity of the TOM complex in yeast; deletion of TOM5 destabilizes the TOM complex and reduces protein import efficiency. In Neurospora crassa, Tom5 deletion does not affect TOM stability or import efficiency, indicating a species-specific structural role. Tom5 crosses the outer membrane with its C-terminus facing the IMS. |
Identification of Neurospora Tom5 by sequence homology; TOM complex stability assessed by native PAGE; import assays in deltaTOM5 yeast and N. crassa; complementation assays |
The Journal of biological chemistry |
High |
15701639
|
| 2005 |
Transport of Tafazzin (Taz1) 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. This establishes Tom5 as required for import of this outer membrane IMS-exposed protein. |
In vitro import assays into yeast mitochondria lacking individual TOM/SAM/Tim components |
Molecular biology of the cell |
Medium |
16135531
|
| 2009 |
A Tom5-Tom40 subcomplex associates with the SAM core complex to form a large SAM-Tom5/Tom40 assembly that binds the alpha-helical precursor of Tom6 after its Mim1-dependent membrane insertion, functioning in the biogenesis of alpha-helical TOM subunits. |
Native PAGE, co-immunoprecipitation, pulse-chase assembly assays in yeast mutants |
Journal of molecular biology |
High |
20026336
|
| 2010 |
Tom5 plays a stimulatory role in TOM complex biogenesis at an early stage of Tom40 assembly at the SAM complex; Tom5 promotes progression of Tom40 from the first SAM stage to the second SAM stage, and Tom5 assembly with Tom40 at the SAM complex is the direct initiation step of newly imported Tom40 assembly. This function is antagonized by Tom7. |
Pulse-chase assembly assays, native PAGE, yeast genetic analysis of deletion strains |
Journal of molecular biology |
High |
20668160 21059357
|
| 2010 |
Tom5 is required for the second stage of Tom40 interaction with the SAM complex during TOM biogenesis. Mim1-deficient mitochondria accumulate Tom40 at the first SAM stage similarly to Tom5-deficient mitochondria, and Tom5 overexpression suppresses the Tom40 assembly defect in mim1Δ cells, placing Mim1 function upstream of Tom5 in Tom40 biogenesis. |
Pulse-chase assembly assay, native PAGE, genetic epistasis in yeast deletion strains |
Molecular biology of the cell |
High |
20668160
|
| 2017 |
Cryo-EM structure of the Neurospora crassa TOM core complex reveals Tom5 transmembrane segment surrounds the Tom40 β-barrel pore within a symmetrical dimeric complex (148 kDa), together with Tom6, Tom7, and Tom22. |
Cryo-electron microscopy (cryo-EM) structure determination |
Cell |
High |
28802041
|
| 2020 |
Cryo-EM structure of the human TOM core complex at near-atomic resolution shows Tom5 surrounds the Tom40 channel as part of the dimeric complex; the N-terminal segment of Tom40 spans the channel to interact with Tom5 at the periphery of the dimer, and this region serves as an exit/recruitment site for presequence-lacking preproteins. |
Single-particle cryo-EM structure determination |
Cell discovery |
High |
33083003
|
| 2025 |
Cryo-EM structure of PINK1 at the TOM-VDAC array shows Tom5 facilitates the symmetric arrangement of two TOM core complexes around a central VDAC2 dimer, and Tom5 directly binds the C-lobe of PINK1 kinase domain, stabilizing PINK1 at the mitochondrial surface. Tom5 (as part of TOM) is required for PINK1 retention on the mitochondrial surface. |
Cryo-EM structure determination (3.1 Å resolution), genetic ablation of TOMM5 in cell-based PINK1 retention assays |
Science (New York, N.Y.) |
High |
40080546
|
| 2025 |
TOM (including subunit TOMM5) is required for PINK1 retention on the mitochondrial surface. Loss of MMP stalls PINK1 during transfer from TOM to TIM23, causing accumulation at TOM; ablation of TOMM5 abrogates PINK1 retention. |
Genome-wide screen with Parkin reporter, siRNA knockdown of TOMM5, cell-based PINK1 localization assays |
The EMBO journal |
Medium |
41266657
|
| 2014 |
All EMC (ER membrane protein complex) proteins interact with the mitochondrial TOM complex protein Tom5, and this interaction is important for phosphatidylserine (PS) transfer from ER to mitochondria and for cell growth. The EMC-TOM5 interaction supports ER-mitochondria tethering, required for phospholipid synthesis. |
Yeast genetic screen for lipid exchange mutants, co-immunoprecipitation of EMC with Tom5, PS transfer assay, growth assays in EMC/ERMES double mutants |
PLoS biology |
High |
25313861
|
| 2002 |
Bcl-2alpha insertion into the mitochondrial outer membrane does not require Tom5 or Tom40, indicating Bcl-2alpha bypasses the general import pore and follows a distinct pathway from Tom20 into the outer membrane. |
In vitro import assay into yeast mitochondria lacking individual TOM subunits (negative result for Tom5 requirement) |
Journal of molecular biology |
Medium |
12419260
|
| 2003 |
Tom5 is not required for cytochrome c import into the mitochondrial IMS; neither Tom5, Tom6, nor Tom7 are needed for cytochrome c import, establishing that cytochrome c uses a Tom5-independent pathway. |
In organello import assay in yeast mutants lacking individual Tom proteins |
Journal of molecular biology |
Medium |
12628251
|
| 2012 |
Tomm5 knockout mice develop a lung-specific phenotype of cryptogenic organizing pneumonia (COP/BOOP), characterized by intra-alveolar fibrosis with fibroblasts/myofibroblasts, macrophage and eosinophil infiltration, while performing normally in other broad phenotyping assays. |
Tomm5(-/-) knockout mouse generation; histopathological analysis of lung tissue |
Veterinary pathology |
Medium |
22688586
|
| 2024 |
TOM5 regulates mitochondrial membrane potential in alveolar epithelial cells; TOM5 reduces early apoptosis and promotes cell proliferation in vitro. TOM5 expression is increased in lung tissue of organizing pneumonia patients and correlates with collagen deposition. |
In vitro knockdown/overexpression in alveolar epithelial cells with mitochondrial membrane potential assay; bleomycin-induced murine OP model |
Redox report |
Low |
38794801
|
| 2011 |
A fusion protein of wild-type p53 with the mitochondrial transmembrane domain of Tom5 (p53-Tom5) localizes exclusively to mitochondria in ARF-null A549 lung cancer cells, induces mitochondrial dysfunction and cytochrome c release, and suppresses cell proliferation, whereas wild-type p53 alone does not. This demonstrates Tom5's TMS is sufficient to direct a cytosolic protein to mitochondria and cause direct mitochondrial dysfunction. |
Plasmid transfection, confocal microscopy for localization, cell proliferation assay, cytochrome c release assay, mitochondrial function assay |
Biological & pharmaceutical bulletin |
Low |
21467644
|
| 2025 |
HSP90-CDC37 chaperone complex covers the C-terminal extension (CTE) of PINK1, which overlaps with interaction sites for TOM5 and TOM20. This structural finding indicates that HSP90 and TOM5 binding to PINK1 are mutually exclusive, providing mechanistic insight into how PINK1 transitions from cytosolic chaperone to TOM complex engagement. |
Cryo-EM structure of PINK1-HSP90-CDC37 complex |
bioRxivpreprint |
Low |
bio_10.1101_2025.10.17.682828
|