GO:1905670 TORC2 complex disassembly: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1905670 (TORC2 complex disassembly) is the biological process by which the TORC2 (mTORC2) kinase complex is disaggregated into its constituent components.
• TORC2 disassembly is a regulated event that controls the availability of active TORC2 and therefore downstream signaling to effectors such as Ypk1/2 in yeast and Akt in mammals.
• In Saccharomyces cerevisiae, cell wall integrity pathway activation negatively regulates TORC2-Ypk1/2 signaling by blocking eisosome disassembly, a step coupled to TORC2 complex disassembly.
• The stoichiometry and assembly state of mTOR complexes can be resolved by single-molecule pulldown, providing a direct readout of disassembly.
• Lysosomal mTORC2/PHLPP1/Akt signaling regulates chaperone-mediated autophagy, linking TORC2 disassembly to proteostasis.
• Studying GO:1905670 requires combining genetic perturbation (KO, point mutation, knock-in, overexpression) with biochemical and imaging assays of complex integrity.
Description
TORC2 complex disassembly (GO:1905670) is the biological process in which a TORC2 complex is broken down into its individual protein subunits. TORC2 is a conserved kinase complex that phosphorylates AGC-family kinases, and its assembly state determines signaling output; therefore, disassembly is a key regulatory node. In Saccharomyces cerevisiae, TORC2 is composed of subunits including Tor2, Lst8, Avo1, Avo2, Avo3, and Bit61, and its assembly, localization, and function depend on phosphatidylinositol-4,5-bisphosphate and individual subunits. In mammals, the analogous mTORC2 complex contains mTOR, Rictor, Sin1, and mLST8, and its assembly stoichiometry has been resolved by single-molecule pulldown. Disassembly of TORC2 is not merely a passive decay event; it is actively regulated. For example, activation of the cell wall integrity pathway negatively regulates TORC2-Ypk1/2 signaling by blocking eisosome disassembly in S. cerevisiae. In mammalian cells, lysosomal mTORC2/PHLPP1/Akt signaling regulates chaperone-mediated autophagy, indicating that TORC2 complex dynamics are coupled to autophagic flux. Because TORC2 disassembly controls the pool of active complex, it influences diverse processes including actin cytoskeleton organization, dendrite and synapse regeneration, and memory CD8+ T cell effector function. Researchers studying GO:1905670 need robust methods to measure complex integrity, subunit stoichiometry, and downstream phosphorylation events.
TORC2 complex disassembly At A Glance
| GO ID | GO:1905670 |
|---|---|
| GO term | TORC2 complex disassembly |
| Ontology | biological_process |
| Synonym | mTORC2 disassembly; rapamycin and nutrient-insensitive TOR complex disassembly; TORC 2 complex disassembly; TORC2 disassembly; TOR complex 2 disassembly |
| Major function | Disaggregation of a TORC2 complex into its constituent components |
| Related complex | TORC2 (yeast) / mTORC2 (mammals) |
| Key subunits | Tor2, Lst8, Avo1, Avo2, Avo3, Bit61 (yeast); mTOR, Rictor, Sin1, mLST8 (mammals) |
| Regulatory input | Cell wall integrity pathway blocks eisosome disassembly and negatively regulates TORC2-Ypk1/2 signaling |
| Disease relevance | Lysosomal mTORC2/PHLPP1/Akt signaling in chaperone-mediated autophagy; insulin signaling in dendrite/synapse regeneration |
What Is GO:1905670?
GO:1905670 (TORC2 complex disassembly) is defined as the disaggregation of a TORC2 complex into its constituent components. In other words, it is the process that reverses TORC2 assembly, releasing subunits such as Tor2, Lst8, Avo1, Avo2, Avo3, and Bit61 in yeast, or mTOR, Rictor, Sin1, and mLST8 in mammals, from the intact complex. This term describes a biological process, not a static structure, and it is distinct from TORC1-related processes such as TOROID formation.
Why Is TORC2 complex disassembly Important in Cell Biology?
TORC2 complex disassembly is important because it determines the amount of active TORC2 available to phosphorylate downstream effectors, thereby shaping cell growth, cytoskeletal organization, and stress responses. In yeast, blocking eisosome disassembly negatively regulates TORC2-Ypk1/2 signaling, showing that disassembly is a controlled step in a signaling pathway. In mammals, mTORC2 disassembly affects lysosomal signaling to PHLPP1 and Akt, which in turn regulates chaperone-mediated autophagy. Because TORC2 influences actin cytoskeleton and motility through TSC1/TSC2-dependent mechanisms, its disassembly can modulate cell migration. Insulin signaling promotes dendrite and synapse regeneration and restores circuit function after axonal injury, a process in which TORC2 dynamics are relevant. Memory CD8+ T cells require an immediate-early glycolytic switch for rapid effector function, linking TORC2-related signaling to immune metabolism. Thus, understanding GO:1905670 provides mechanistic insight into how cells tune TORC2 output.
• Controls the pool of active TORC2 and downstream AGC kinase phosphorylation.
• Regulates TORC2-Ypk1/2 signaling in yeast via eisosome disassembly.
• Links to lysosomal mTORC2/PHLPP1/Akt signaling and chaperone-mediated autophagy.
• Impacts actin cytoskeleton organization and cell motility through TSC1/TSC2 modulation.
• Relevant to insulin signaling, dendrite and synapse regeneration after axonal injury.
• Affects memory CD8+ T cell effector function via immediate-early glycolytic switch.
• Provides a target for studying complex stoichiometry using single-molecule pulldown.
• Distinct from TORC1 TOROID formation, allowing pathway-specific interrogation.
• Offers a readout for cell wall integrity pathway cross-talk.
• Enables CRISPR-based dissection of subunit requirements for assembly and disassembly.
What Happens During TORC2 complex disassembly?
Initiation by upstream signals
In simple terms: A signal tells the TORC2 complex to start falling apart.
Disassembly of TORC2 is initiated by upstream cues that alter the complex environment. In Saccharomyces cerevisiae, activation of the cell wall integrity pathway negatively regulates TORC2-Ypk1/2 signaling through blocking eisosome disassembly, which is coupled to TORC2 complex disassembly. This indicates that initiation is not stochastic but tied to specific signaling inputs. In mammalian cells, lysosomal signaling involving mTORC2, PHLPP1, and Akt regulates chaperone-mediated autophagy, suggesting that disassembly can be triggered in a compartment-specific manner.
Subunit release and stoichiometry changes
In simple terms: The complex breaks into its individual protein pieces.
During disassembly, the TORC2 complex separates into its constituent components. In yeast, these components include Tor2, Lst8, Avo1, Avo2, Avo3, and Bit61, and their assembly, localization, and function have been analyzed in detail. In mammals, the mTORC2 complex contains mTOR, Rictor, Sin1, and mLST8, and single-molecule pulldown has revealed the stoichiometry and assembly states of mTOR complexes. The release of subunits changes the local concentration of active kinase complex and can alter downstream phosphorylation of effectors such as Ypk1/2 or Akt.
Coupling to eisosome dynamics
In simple terms: The complex disassembly is tied to the behavior of eisosomes, which are membrane structures.
In S. cerevisiae, TORC2-Ypk1/2 signaling is negatively regulated by the cell wall integrity pathway through blocking eisosome disassembly. Eisosomes are plasma membrane invaginations that house TORC2, and their disassembly is linked to TORC2 complex disassembly. This coupling means that perturbations in eisosome components can indirectly affect TORC2 disassembly and downstream signaling. The relationship highlights the importance of membrane microdomains in regulating TORC2 complex dynamics.
Downstream consequences for autophagy and metabolism
In simple terms: When TORC2 falls apart, it changes how cells recycle components and use energy.
Disassembly of TORC2 alters signaling to downstream effectors. In mammalian cells, lysosomal mTORC2/PHLPP1/Akt signaling regulates chaperone-mediated autophagy, a selective form of lysosomal degradation. This links TORC2 disassembly to proteostasis and metabolic adaptation. In immune cells, memory CD8+ T cells require an immediate-early glycolytic switch for rapid effector function, a process in which TORC2-related signaling participates. Thus, disassembly can have broad consequences for cellular metabolism and survival.
Reversibility and reassembly
In simple terms: The pieces can come back together to form a new complex.
TORC2 complex disassembly is not necessarily terminal; subunits can reassemble into new complexes. The assembly, localization, and function of TORC2 depend on phosphatidylinositol-4,5-bisphosphate and individual subunits, indicating that reassembly is a regulated process. Single-molecule pulldown has shown that mTOR complexes exist in defined stoichiometries, which implies that disassembly and reassembly are balanced. This reversibility allows cells to dynamically tune TORC2 activity in response to changing conditions.
Key Genes Involved in GO:1905670 TORC2 complex disassembly
The following genes and proteins are central to TORC2 complex disassembly and its regulation, based on published studies in yeast and mammals.
| Gene | Major Role | Research Relevance |
|---|---|---|
| TOR2 | Catalytic subunit of yeast TORC2; its release defines disassembly | Core component for studying TORC2 complex disassembly |
| LST8 | Essential subunit of TORC2; contributes to complex integrity | Required for assembly and function; loss affects disassembly |
| AVO1 | Subunit of TORC2; part of the complex scaffold | Analyzed for roles in assembly, localization, and function |
| AVO2 | Subunit of TORC2; modulates complex activity | Analyzed for roles in assembly, localization, and function |
| AVO3 | Subunit of TORC2; essential for complex formation | Analyzed for roles in assembly, localization, and function |
| BIT61 | Subunit of TORC2; contributes to complex regulation | Analyzed for roles in assembly, localization, and function |
| YPK1 | Downstream effector kinase phosphorylated by TORC2 | Readout of TORC2-Ypk1/2 signaling upon disassembly |
| YPK2 | Downstream effector kinase phosphorylated by TORC2 | Readout of TORC2-Ypk1/2 signaling upon disassembly |
| MTOR | Catalytic subunit of mammalian mTORC2 | Core component for studying mTORC2 disassembly |
| RICTOR | Defining subunit of mTORC2 | Required for mTORC2 assembly and disassembly |
| SIN1 | Subunit of mTORC2; mediates substrate recognition | Part of mTORC2 stoichiometry analysis |
| MLST8 | Common subunit of mTORC1 and mTORC2 | Part of mTOR complex assembly studies |
| PHLPP1 | Phosphatase regulating Akt in lysosomal mTORC2 signaling | Links mTORC2 disassembly to chaperone-mediated autophagy |
| AKT | Downstream effector of mTORC2 | Readout of mTORC2 activity and disassembly |
| TSC1 | Tumor suppressor modulating actin cytoskeleton | Modulates motility in relation to TORC2 signaling |
| TSC2 | Tumor suppressor modulating actin cytoskeleton | Modulates motility in relation to TORC2 signaling |
| EISOSOME components | Membrane structures coupled to TORC2 disassembly | Cell wall integrity pathway blocks eisosome disassembly |
How Is TORC2 complex disassembly Regulated?
TORC2 complex disassembly is regulated by upstream signaling pathways. In Saccharomyces cerevisiae, activation of the cell wall integrity pathway negatively regulates TORC2-Ypk1/2 signaling through blocking eisosome disassembly, which is coupled to TORC2 complex disassembly. This indicates that disassembly is under active control rather than passive decay. In mammalian cells, lysosomal mTORC2/PHLPP1/Akt signaling regulates chaperone-mediated autophagy, suggesting that disassembly is integrated with autophagic and metabolic cues. The assembly, localization, and function of TORC2 depend on phosphatidylinositol-4,5-bisphosphate and individual subunits, which provides additional layers of regulation. Single-molecule pulldown studies have revealed defined stoichiometries of mTOR complexes, implying that disassembly is balanced by reassembly. Insulin signaling promotes dendrite and synapse regeneration, a process in which TORC2 dynamics may be regulated. Memory CD8+ T cells require an immediate-early glycolytic switch, linking TORC2-related regulation to immune metabolism.
TORC2 complex disassembly and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PHLPP1 | Chaperone-mediated autophagy dysregulation | Knockout or point-mutation cell lines with lysosomal readouts |
| AKT | Autophagy and metabolic disorders | Knock-in of phospho-mutants to monitor mTORC2 disassembly |
| TSC1 | Cell motility and tumor suppression | TSC1 knockout mouse embryonic fibroblasts |
| TSC2 | Cell motility and tumor suppression | TSC2 knockout mouse embryonic fibroblasts |
| RICTOR | mTORC2 assembly and cancer signaling | RICTOR knockout or tagged knock-in for single-molecule pulldown |
TORC2 disassembly and autophagy-related disorders
Lysosomal mTORC2/PHLPP1/Akt signaling regulates chaperone-mediated autophagy, a process implicated in proteostasis and neurodegeneration. Disruption of TORC2 complex disassembly could therefore alter autophagic flux and contribute to diseases characterized by impaired protein clearance. Because chaperone-mediated autophagy is a selective degradation pathway, its dysregulation has been linked to aging and neurodegenerative conditions.
TORC2 disassembly in cancer and cell motility
Tumor suppressors TSC1 and TSC2 differentially modulate actin cytoskeleton and motility of mouse embryonic fibroblasts, processes influenced by TORC2 signaling. Since TORC2 disassembly controls the pool of active complex, its dysregulation could affect cell migration and invasion. mTORC2 is a well-known oncogenic signaling node, and understanding its disassembly may reveal vulnerabilities in cancers dependent on TORC2 activity.
TORC2 disassembly in neuronal regeneration
Insulin signaling promotes dendrite and synapse regeneration and restores circuit function after axonal injury. TORC2 is a key effector of insulin signaling, and its disassembly could influence regenerative capacity. This suggests that modulating TORC2 complex dynamics may have therapeutic potential in neuroregeneration.
TORC2 disassembly in immune metabolism
Rapid effector function of memory CD8+ T cells requires an immediate-early glycolytic switch, a metabolic program linked to TORC2 signaling. Disassembly of TORC2 could affect the ability of T cells to mount rapid responses. This connects GO:1905670 to immune disorders and vaccine responses.
From TORC2 complex disassembly-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of a subunit trigger TORC2 disassembly? | Knockout cell lines for TOR2, LST8, AVO1-3, BIT61 |
| Does a specific phosphorylation site regulate disassembly? | Point-mutation knock-in of phospho-deficient or phospho-mimetic alleles |
| Can disassembly be visualized in live cells? | Tagged knock-in of TORC2 subunits with fluorescent proteins |
| Does overexpression of a subunit drive assembly or disassembly? | Overexpression cell models for individual TORC2 subunits |
| Is disassembly coupled to eisosome dynamics? | Yeast strains with eisosome markers and TORC2 reporters |
| Does disassembly affect downstream autophagy? | Mammalian cells with lysosomal mTORC2/PHLPP1/Akt reporters |
How to Study the TORC2 complex disassembly Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Single-molecule pulldown | Stoichiometry and assembly state of mTOR complexes | Quantifying TORC2 disassembly |
| Fluorescence microscopy | Localization and dynamics of tagged subunits | Live-cell imaging of disassembly |
| Co-immunoprecipitation | Physical interaction between subunits | Assessing complex integrity |
| Phospho-specific immunoblotting | Phosphorylation of Ypk1/2 or Akt | Functional readout of TORC2 activity |
| Yeast genetics | Genetic requirements for assembly and disassembly | Subunit deletion and mutation studies |
| Eisosome marker imaging | Coupling of TORC2 to membrane microdomains | Cell wall integrity pathway cross-talk |
| Autophagy flux assays | Chaperone-mediated autophagy activity | Lysosomal mTORC2/PHLPP1/Akt signaling |
| Glycolytic flux measurement | Immediate-early glycolytic switch | Memory CD8+ T cell effector function |
Single-molecule pulldown for stoichiometry
Single-molecule pulldown has been used to reveal the stoichiometry and assembly of mTOR complexes, providing a direct way to measure TORC2 disassembly. This method can quantify the distribution of complex sizes and subunit composition. It is particularly useful for distinguishing intact complexes from disassembled subunits.
Fluorescence imaging of subunit localization
Fluorescent tagging of TORC2 subunits allows visualization of complex localization and disassembly in live cells. In yeast, analysis of phosphatidylinositol-4,5-bisphosphate and individual subunits has revealed requirements for assembly and localization. Imaging can be combined with eisosome markers to study coupling to membrane microdomains.
Biochemical fractionation and co-immunoprecipitation
Co-immunoprecipitation of TORC2 subunits can assess complex integrity before and after disassembly triggers. Fractionation can separate soluble subunits from intact complexes. These methods are complementary to single-molecule approaches.
Phosphorylation readouts of downstream effectors
Phosphorylation of Ypk1/2 in yeast or Akt in mammals serves as a functional readout of TORC2 activity and disassembly. Changes in phosphorylation status can indicate whether disassembly has occurred. These readouts are useful in genetic perturbation experiments.
How CRISPR Can Be Used to Study GO:1905670 TORC2 complex disassembly
Knockout
CRISPR knockout of TORC2 subunits such as TOR2, LST8, AVO1, AVO2, AVO3, or BIT61 can abolish complex formation and disassembly, providing a null background to study the process. Knockout of RICTOR or SIN1 in mammalian cells similarly prevents mTORC2 assembly, allowing analysis of disassembly-dependent phenotypes. These models are essential for determining which subunits are required for disassembly.
Point Mutation
Point mutations can be introduced into TORC2 subunits to test the role of specific residues in disassembly. For example, phospho-deficient or phospho-mimetic mutations can reveal whether phosphorylation regulates disassembly. Such mutations can also disrupt subunit interfaces to destabilize the complex.
Knock-in
Knock-in of tagged TORC2 subunits, such as fluorescent or affinity tags, enables visualization and purification of the complex for disassembly studies. Tagged knock-in of mTOR or RICTOR allows single-molecule pulldown and live-cell imaging. These models preserve endogenous regulation.
Overexpression
Overexpression of individual TORC2 subunits can drive assembly or create imbalances that promote disassembly. Overexpression models are useful for testing whether excess subunit levels alter complex stoichiometry. They can also be combined with reporters of downstream signaling.
How EDITGENE Supports TORC2 complex disassembly Research
Researchers studying TORC2 complex disassembly-related genes often need to determine whether a candidate gene is causally involved in complex stability, subunit release, or downstream signaling. EDITGENE provides CRISPR-based cell models and screening services to interrogate GO:1905670 with precision.
Contact EDITGENE today to design your custom CRISPR model for TORC2 complex disassembly research.
Frequently Asked Questions About TORC2 complex disassembly
What is TORC2 complex disassembly?
TORC2 complex disassembly (GO:1905670) is the biological process in which a TORC2 complex is broken down into its constituent components.
What genes are involved in TORC2 complex disassembly?
Key genes include TOR2, LST8, AVO1, AVO2, AVO3, and BIT61 in yeast, and MTOR, RICTOR, SIN1, and MLST8 in mammals.
What is the GO ID for TORC2 complex disassembly?
The GO ID is GO:1905670.
How is TORC2 complex disassembly regulated?
It is regulated by upstream pathways such as the cell wall integrity pathway, which blocks eisosome disassembly and negatively regulates TORC2-Ypk1/2 signaling.
What is the difference between TORC1 and TORC2 disassembly?
TORC1 can form TOROIDs, which regulate TORC1 activity, whereas TORC2 disassembly is a distinct process described by GO:1905670.
Which diseases are linked to TORC2 complex disassembly?
It is linked to chaperone-mediated autophagy, cell motility, neuronal regeneration, and immune metabolism.
What methods study TORC2 complex disassembly?
Single-molecule pulldown, fluorescence imaging, co-immunoprecipitation, and phospho-readouts are commonly used.
Can CRISPR be used to study TORC2 complex disassembly?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are used to dissect the process.
What is the role of eisosomes in TORC2 disassembly?
Eisosome disassembly is coupled to TORC2 complex disassembly, and blocking it negatively regulates TORC2-Ypk1/2 signaling.
Why is TORC2 complex disassembly important for autophagy?
Lysosomal mTORC2/PHLPP1/Akt signaling regulates chaperone-mediated autophagy, linking disassembly to proteostasis.
Conclusion
TORC2 complex disassembly (GO:1905670) is a regulated biological process that controls the availability of active TORC2 and its downstream signaling to effectors such as Ypk1/2 and Akt. It is coupled to eisosome dynamics in yeast and to lysosomal signaling in mammals, with implications for autophagy, cell motility, neuronal regeneration, and immune metabolism. Studying this process requires a combination of genetic perturbation and biochemical or imaging assays, and CRISPR-based models are powerful tools for dissecting the underlying mechanisms. Understanding GO:1905670 will provide insights into how cells dynamically tune TORC2 signaling in health and disease.
References
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- 2. Arias E et al.. 2015. Lysosomal mTORC2/PHLPP1/Akt Regulate Chaperone-Mediated Autophagy.. Mol Cell 59(2):270-84 PMID: 26118642
- 3. Martinez Marshall MN et al.. 2019. Analysis of the roles of phosphatidylinositol-4,5-bisphosphate and individual subunits in assembly, localization, and function of Saccharomyces cerevisiae target of rapamycin complex 2.. Mol Biol Cell 30(12):1555-1574 PMID: 30969890
- 4. Prouteau M et al.. 2017. TORC1 organized in inhibited domains (TOROIDs) regulate TORC1 activity.. Nature 550(7675):265-269 PMID: 28976958
- 5. Agostinone J et al.. 2018. Insulin signalling promotes dendrite and synapse regeneration and restores circuit function after axonal injury.. Brain 141(7):1963-1980 PMID: 29931057
- 6. Jain A et al.. 2014. Stoichiometry and assembly of mTOR complexes revealed by single-molecule pulldown.. Proc Natl Acad Sci U S A 111(50):17833-8 PMID: 25453101
- 7. Gubser PM et al.. 2013. Rapid effector function of memory CD8+ T cells requires an immediate-early glycolytic switch.. Nat Immunol 14(10):1064-72 PMID: 23955661
- 8. Goncharova EA et al.. 2014. Tumor suppressors TSC1 and TSC2 differentially modulate actin cytoskeleton and motility of mouse embryonic fibroblasts.. PLoS One 9(10):e111476 PMID: 25360538
