The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.
You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.
We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.
We are interested in where in or outside the cell the gene product carries out its function.
We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.
Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.
The C. elegans gene tomm-22 (systematic name W10D9.5) encodes a mitochondrial import receptor subunit TOM22 homolog (UniProt O17287). It belongs to the conserved Tom22 protein family (InterPro IPR005683; Pfam PF04281) and is a core component of the translocase of the outer mitochondrial membrane (TOM) complex. The protein is involved in protein transport across the outer mitochondrial membrane (tan2025metforminmodulatesthe pages 2-4, billing2011mitochondrialfunctionis pages 8-9). Orthologous Tom22 proteins have been extensively characterized in Saccharomyces cerevisiae, Neurospora crassa, and humans, and the high degree of functional conservation across eukaryotes permits confident inference of TOMM-22 function in C. elegans from these model systems.
TOMM-22 is not an enzyme; rather, it functions as a receptor and structural organizer within the TOM complex, which serves as the principal entry gate for the ~1,000 nuclear-encoded mitochondrial precursor proteins that must be imported from the cytosol into mitochondria.
Presequence recognition. Tom22 acts as a preprotein receptor on the cytosolic face of the mitochondrial outer membrane. Its N-terminal cytosolic domain is enriched in acidic (Glu/Asp) residues, enabling salt-sensitive binding of positively charged mitochondrial targeting presequences (endo2002functionsofouter pages 6-8, endo2010transportofproteins pages 3-4). Tom22 and Tom20 function cooperatively but recognize complementary features of amphipathic presequence helices: Tom20 binds the hydrophobic surface, while Tom22 recognizes the hydrophilic (positively charged) surface (endo2002functionsofouter pages 6-8, endo2010transportofproteins pages 3-4). This dual recognition mechanism ensures efficient and specific capture of presequence-containing precursor proteins at the mitochondrial surface.
Transfer to the Tom40 channel. After initial recognition at the cytosolic cis-site by Tom20 and Tom22, precursor proteins are handed off, likely via Tom5, to the Tom40 β-barrel channel for translocation across the outer membrane (jain2025investigatingmitochondrialpresequence pages 15-17, endo2010transportofproteins pages 2-3). The transition between Tom20/Tom22 receptors and the Tom40 channel is optimized through the physical organization of the TOM complex (lionaki2023mitochondrialproteinimport pages 2-2).
Trans-site function in the intermembrane space (IMS). Tom22 also functions on the IMS side of the outer membrane. Its C-terminal IMS domain contributes, together with Tom40 and Tom7, to a trans-site that binds presequences as they emerge from the Tom40 channel into the intermembrane space (endo2010transportofproteins pages 3-4, genge2022coordinatedtranslocationof pages 2-4, genge2022coordinatedtranslocationof pages 1-2). Critically, the IMS domain of Tom22 directly interacts with Tim50 and Tim21, key subunits of the TIM23 inner membrane translocase complex, thereby bridging the transfer of presequence-containing precursors from the outer to the inner membrane import machinery (genge2022coordinatedtranslocationof pages 2-4, araiso2022structuraloverviewof pages 5-7, laan2006mitochondrialpreproteintranslocases pages 5-7). Tim50 promotes presequence binding to Tom22 at the trans-site, and Tim21 subsequently displaces the presequence from Tom22 to facilitate its insertion into the Tim23 channel in a membrane potential-dependent manner (laan2006mitochondrialpreproteintranslocases pages 5-7).
Tom22 is not merely a receptor but a central structural organizer of the TOM complex. Studies in yeast have demonstrated that Tom22 is tightly associated with Tom40 and small Tom proteins (Tom5, Tom6, Tom7) to form the core GIP (general insertion pore) complex (model2002proteintranslocaseof pages 1-2). When Tom22 is deleted, Tom40 forms only small ~80 kDa functional units that behave as single channels, indicating that Tom22 is essential for organizing multiple Tom40 channels into the larger oligomeric TOM complex (model2002proteintranslocaseof pages 1-2, model2002proteintranslocaseof pages 5-7).
Recent cryo-EM structures of both yeast and human TOM complexes at resolutions of 2.5–3.0 Å have revealed the detailed architecture. In the dimeric TOM core complex, two Tom22 molecules are symmetrically embedded between the two Tom40 β-barrels, physically tethering them together (araiso2022structuraloverviewof pages 3-5, guan2021structuralinsightsinto pages 1-3). Tom22 forms a kinked transmembrane helix with its N-terminal receptor domain on the cytosolic side (partially disordered) and its C-terminal IMS domain positioned in close proximity to the C-terminal helix of Tom40 at the center of the dimer (araiso2022structuraloverviewof pages 3-5, araiso2022structuraloverviewof pages 5-7). In the human TOM complex structure, the cytosolic domain of Tom22 contains a negatively charged glutamic acid/aspartic acid-rich segment (residues 29–42) with extended conformation serving as a preprotein retention platform, and an adjacent amphipathic region (residues 65–82) that facilitates binding to presequences through hydrophobic interactions (guan2021structuralinsightsinto pages 3-4). Phospholipid molecules participate in the Tom22–Tom40 interface, contributing to complex stability (guan2021structuralinsightsinto pages 3-4, guan2021structuralinsightsinto pages 1-3, nussberger2024newinsightsinto pages 2-4).
TOMM-22 is localized to the mitochondrial outer membrane. It is a single-pass transmembrane protein anchored by a hydrophobic transmembrane segment, with its N-terminal domain exposed to the cytosol and its C-terminal domain exposed to the intermembrane space (perry2008structuretopologyand pages 3-5, endo2010transportofproteins pages 3-4). This dual topology is critical to its function as a receptor on both sides of the outer membrane.
In C. elegans, RNAi knockdown of tomm-22 robustly activates the mitochondrial unfolded protein response (UPRmt), as measured by strong induction of the mitochondrial chaperone reporters Phsp-6::GFP and Phsp-60::GFP (billing2011mitochondrialfunctionis pages 8-9, billing2011mitochondrialfunctionis pages 7-8, bennett2014activationofthe pages 2-3). A genome-wide RNAi screen for negative regulators of the UPRmt identified tomm-22 as one of the genes whose knockdown induces the hsp-6p::gfp reporter (bennett2014activationofthe pages 2-3). The mechanism of UPRmt activation by tomm-22 depletion is consistent with the general model: under normal conditions, the transcription factor ATFS-1 is efficiently imported into mitochondria and degraded by the protease LONP-1; when mitochondrial import is compromised (as when TOM complex components are depleted), ATFS-1 accumulates in the cytosol and translocates to the nucleus, where it activates expression of mitochondrial chaperones and quality control genes (xin2022theuprmtpreserves pages 1-2, haynes2022mitochondrialdysfunctionaging pages 5-6).
Notably, UPRmt activation also upregulates the expression of TOM/TIM complex components including tomm-22 itself (one- to twofold enhancement), creating a homeostatic feedback loop that preserves mitochondrial import capacity under stress (xin2022theuprmtpreserves pages 4-6).
Unlike depletion of the channel subunit TOMM-40, which causes severe larval arrest and sterility, tomm-22(RNAi) does not produce strong growth arrest or sterility in C. elegans (billing2011mitochondrialfunctionis pages 8-9). This suggests that TOMM-22 is important for mitochondrial homeostasis but is less limiting than the core channel subunit TOMM-40 under RNAi conditions. However, tomm-22 knockdown does cause:
The tomm-22 RNAi model has been used as a constitutive UPRmt activator in aging studies. Tan et al. (2025) demonstrated that metformin treatment of short-lived tomm-22(RNAi) worms could suppress the UPRmt and extend lifespan, indicating that the lifespan shortening caused by tomm-22 depletion is at least partially independent of UPRmt activation status (tan2025metforminmodulatesthe pages 2-4). This work highlights the complex relationship between mitochondrial import stress, UPRmt, and longevity, where activation of UPRmt per se is neither necessary nor sufficient for lifespan extension (bennett2014activationofthe pages 2-3).
TOMM-22 functions within the mitochondrial protein import pathway, specifically as part of the TOM complex / presequence import pathway. This pathway encompasses:
In C. elegans, perturbation of this pathway by tomm-22 depletion intersects with the ATFS-1-mediated UPRmt signaling cascade and DAF-28/insulin secretion physiology, linking mitochondrial import efficiency to developmental and metabolic signaling (billing2011mitochondrialfunctionis pages 8-9, haynes2022mitochondrialdysfunctionaging pages 5-6).
While not yet demonstrated in C. elegans specifically, mammalian TOM22 has been shown to serve as a mitochondrial receptor for the pro-apoptotic protein Bax. TOM22 interacts with the first alpha helix (Ha1) of Bax, and blocking TOM22 with antibodies or reducing its expression prevents Bax translocation to mitochondria and inhibits Bax-dependent apoptosis (bellot2007tom22acore pages 2-3, bellot2007tom22acore pages 1-2, bellot2007tom22acore pages 3-5, bellot2007tom22acore pages 5-6). This function extends TOM22's role beyond general protein import to include regulation of programmed cell death. Additionally, TOM22 is a substrate of Parkin-mediated ubiquitylation in the PINK1/Parkin mitophagy pathway, where the ubiquitin-proteasome system monitors mitochondrial surface proteins.
| Property | Description | Evidence Source |
|---|---|---|
| Protein identity | tomm-22 / W10D9.5 in Caenorhabditis elegans is annotated as a homolog of Tom22, a subunit of the translocase of the outer mitochondrial membrane (TOM) complex; recent worm work explicitly describes TOMM-22 as being involved in protein transport across the outer mitochondrial membrane. | (tan2025metforminmodulatesthe pages 2-4, billing2011mitochondrialfunctionis pages 8-9) |
| Molecular function | Tom22 is a mitochondrial preprotein import receptor and organizer of the TOM complex. Its cytosolic domain binds positively charged mitochondrial targeting presequences, complementing Tom20 by recognizing the more hydrophilic face of amphipathic presequences; it then helps transfer precursor proteins toward the Tom40 channel. | (endo2002functionsofouter pages 6-8, endo2010transportofproteins pages 3-4) |
| Subcellular localization | Tom22 is a single-pass outer mitochondrial membrane protein with the N-terminus exposed to the cytosol and the C-terminus exposed to the intermembrane space (IMS), placing it on both sides of the import pathway. | (perry2008structuretopologyand pages 3-5, endo2010transportofproteins pages 3-4) |
| Domain architecture | Tom22 contains three major regions: (1) N-terminal cytosolic receptor/cis domain, often acidic and presequence-binding; (2) one transmembrane helix anchoring it in the outer membrane; and (3) a C-terminal IMS/trans domain involved in trans-site binding and transfer to downstream machinery. Human structural work further resolves acidic and amphipathic sequence features in the cytosolic region that support preprotein binding. | (perry2008structuretopologyand pages 3-5, endo2010transportofproteins pages 3-4, guan2021structuralinsightsinto pages 3-4) |
| Structural role in TOM complex | Tom22 is a central structural organizer of the TOM core complex. Biochemical and structural studies show it associates tightly with Tom40 and small Tom proteins, and cryo-EM indicates two Tom22 molecules bridge/tether the two Tom40 β-barrels in the dimeric complex, helping stabilize higher-order TOM architecture. | (model2002proteintranslocaseof pages 1-2, araiso2022structuraloverviewof pages 3-5, guan2021structuralinsightsinto pages 1-3) |
| Role in precursor transfer | Tom22 participates in a chain of low-affinity binding and handoff steps: presequences are recognized by Tom20/Tom22 at the cytosolic face, passed toward Tom5/Tom40, and then encounter a trans site formed by IMS-exposed regions of Tom22, Tom40, and Tom7. | (genge2022coordinatedtranslocationof pages 2-4, genge2022coordinatedtranslocationof pages 1-2, endo2010transportofproteins pages 3-4, endo2010transportofproteins pages 2-3) |
| Coupling to TIM23 pathway | The IMS domain of Tom22 helps connect TOM to the TIM23 machinery. It contributes to the trans-site for presequence binding and directly or indirectly recruits Tim50/Tim23/Tim21, enabling efficient handoff of presequence-containing substrates into the inner-membrane import pathway. | (genge2022coordinatedtranslocationof pages 2-4, araiso2022structuraloverviewof pages 5-7, laan2006mitochondrialpreproteintranslocases pages 5-7) |
| Substrate specificity / what it transports | TOMM-22 is not an enzyme; it functions as a receptor/organizer for nuclear-encoded mitochondrial precursor proteins, especially those carrying N-terminal cleavable presequences. Its binding preference is shaped by electrostatic recognition of positively charged targeting signals. | (endo2002functionsofouter pages 6-8, perry2008structuretopologyand pages 3-5, endo2010transportofproteins pages 3-4) |
| Role in UPRmt | In C. elegans, tomm-22 knockdown activates the mitochondrial unfolded protein response (UPRmt), as shown by induction of mitochondrial stress reporters. More broadly, TOM/TIM import impairment reduces mitochondrial import efficiency, allowing ATFS-1 to escape mitochondrial import/degradation and activate the nuclear UPRmt program. UPRmt activation can also upregulate import machinery, including tomm-22. | (billing2011mitochondrialfunctionis pages 8-9, xin2022theuprmtpreserves pages 1-2, haynes2022mitochondrialdysfunctionaging pages 5-6, xin2022theuprmtpreserves pages 4-6, bennett2014activationofthe pages 2-3) |
| C. elegans RNAi phenotypes | tomm-22(RNAi) causes a DAF-28/insulin secretion defect and robust UPRmt activation, but unlike tomm-40 depletion it does not cause strong larval arrest or sterility in the cited study, suggesting TOMM-22 is important for mitochondrial homeostasis yet less limiting than TOMM-40 under those RNAi conditions. | (billing2011mitochondrialfunctionis pages 8-9, billing2011mitochondrialfunctionis pages 7-8, billing2011mitochondrialfunctionis pages 9-10) |
| Lifespan / stress phenotypes in worms | A genome-wide worm RNAi screen identified tomm-22 as a UPRmt-inducing gene; in that dataset, tomm-22(RNAi) significantly reduced mean lifespan by 14.5% relative to empty-vector control. A later study used tomm-22 RNAi as a constitutive UPRmt model with shortened lifespan that could be extended by metformin treatment. | (bennett2014activationofthe pages 2-3, tan2025metforminmodulatesthe pages 2-4) |
| Pathway involvement | TOMM-22 functions in mitochondrial protein import and biogenesis, specifically the TOM complex / presequence pathway, and in worms its perturbation intersects with mitochondrial stress signaling (UPRmt) and DAF-28/insulin secretion physiology. | (billing2011mitochondrialfunctionis pages 8-9, genge2022coordinatedtranslocationof pages 2-4, genge2022coordinatedtranslocationof pages 1-2) |
| Evolutionary/functional inference confidence | Direct C. elegans mechanistic data on TOMM-22 are limited, but confidence in functional annotation is strengthened by strong family conservation across fungi, animals, and humans, plus consistent worm RNAi phenotypes tied to mitochondrial import stress. | (billing2011mitochondrialfunctionis pages 8-9, araiso2022structuraloverviewof pages 3-5, guan2021structuralinsightsinto pages 3-4) |
Table: This table summarizes the best-supported functional properties of C. elegans TOMM-22/W10D9.5, combining direct worm evidence with conserved mechanistic evidence from TOM22 homologs. It is useful for functional annotation because it distinguishes experimentally observed worm phenotypes from higher-confidence family-based inferences about mitochondrial protein import.
C. elegans TOMM-22 (W10D9.5) is a conserved mitochondrial outer membrane protein that functions as a receptor subunit and structural organizer of the TOM complex. Its primary role is to recognize mitochondrial targeting presequences on the cytosolic face and facilitate their transfer through the Tom40 channel and onward to the TIM23 inner membrane translocase via its IMS domain. In C. elegans, tomm-22 depletion activates the mitochondrial unfolded protein response, impairs DAF-28/insulin secretion, and shortens lifespan, consistent with its role in maintaining mitochondrial protein homeostasis. While direct biochemical characterization of the C. elegans protein is limited, the high conservation of the Tom22 family across eukaryotes, combined with consistent RNAi phenotypes in worms, provides strong confidence in the functional annotation of TOMM-22 as a mitochondrial import receptor and TOM complex organizer.
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