GO:0061136 regulation of proteasomal protein catabolic process: Protein Degradation Control, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0061136 describes any process that modulates the rate, frequency, or extent of proteasome-mediated protein breakdown, a central node of cellular proteostasis.
• The 26S proteasome is a ~2.5 MDa ATP-dependent machine built from a 20S catalytic core and one or two 19S regulatory particles.
• Regulation occurs at multiple levels: substrate ubiquitination, proteasome assembly, nuclear import, and post-translational modification of proteasome subunits.
• Dysregulation of proteasomal catabolism is linked to cancer, inflammatory cell death, and neurodegeneration.
• AKIRIN2 controls nuclear import of proteasomes in vertebrates, revealing a dedicated regulatory route for nuclear proteolysis.
• CRISPR knockout, point-mutation, knock-in, and overexpression models enable causal dissection of regulators within this GO term.
Description
GO:0061136, regulation of proteasomal protein catabolic process, is a biological_process term that captures every mechanism controlling the rate, frequency, or extent of protein hydrolysis mediated by the proteasome. Because the proteasome degrades the majority of short-lived and misfolded proteins, its regulation sits at the intersection of cell-cycle control, signal transduction, immune signaling, and protein quality control. Researchers studying this term ask how cells tune proteasome abundance, localization, and activity to match changing demands, and how failures in that tuning contribute to disease. The 26S proteasome is the principal executioner of this pathway, and its structure and function have been resolved in molecular detail. Regulatory inputs include ubiquitin-chain recognition, proteasome assembly chaperones, nuclear import factors, and reversible subunit modifications. Understanding GO:0061136 therefore requires integrating structural biology, ubiquitin signaling, and cell-biological models of proteostasis.
regulation of proteasomal protein catabolic process At A Glance
| GO ID | GO:0061136 |
|---|---|
| GO term | regulation of proteasomal protein catabolic process |
| Ontology | biological_process |
| Synonym | None listed in QuickGO |
| Major function | Modulates the rate, frequency, or extent of proteasome-mediated protein breakdown |
| Core machinery | 26S proteasome (20S core + 19S regulatory particle) |
| Key regulatory inputs | Ubiquitination, assembly chaperones, nuclear import, subunit modification |
| Disease relevance | Cancer, inflammatory cell death, neurodegeneration |
| Experimental handle | CRISPR KO, point mutation, knock-in, overexpression, proteasome reporters |
What Is GO:0061136?
In plain terms, GO:0061136 covers the control knobs that decide how fast, how often, and how completely the proteasome destroys proteins. The QuickGO definition states that it is any process that modulates the rate, frequency, or extent of the chemical reactions and pathways resulting in the breakdown of a protein or peptide by hydrolysis of its peptide bonds that is mediated by the proteasome. This includes regulation of substrate delivery, proteasome assembly, proteasome localization, and catalytic activity, but excludes non-proteasomal proteolysis.
Why Is regulation of proteasomal protein catabolic process Important in Cell Biology?
Regulation of proteasomal protein catabolic process is important because the proteasome controls the lifetime of proteins that govern cell division, apoptosis, immune signaling, and stress responses. When this regulation fails, cells accumulate damaged proteins or degrade protective factors, contributing to cancer, inflammatory cell death, and neurodegeneration. Because the proteasome is also a validated drug target, understanding its regulatory layers informs therapeutic strategies and resistance mechanisms.
• Controls turnover of cell-cycle regulators and tumor suppressors, linking GO:0061136 to cancer biology.
• Shapes inflammatory cell death and immune signaling through regulated degradation of signaling proteins.
• Maintains proteostasis by removing misfolded and damaged proteins, a process implicated in neurodegeneration.
• Determines nuclear proteolysis capacity via regulated proteasome import.
• Provides a druggable node: proteasome inhibitors are used in hematologic malignancies.
• Requires assembly chaperones and dedicated regulators, offering many experimental entry points.
• Is conserved from bacteria to humans, enabling comparative mechanistic studies.
• Involves charge-mediated targeting signals that influence substrate selection.
What Happens During regulation of proteasomal protein catabolic process?
Substrate recognition and ubiquitination
In simple terms: Proteins are first tagged with ubiquitin so the proteasome knows what to destroy.
Regulation begins with substrate tagging: ubiquitin chains are assembled on target proteins by E1, E2, and E3 enzymes, and the chain topology determines whether the substrate is recognized by proteasome receptors. Ubiquitination is itself regulated, so the rate of proteasomal catabolism is set partly by the availability and activity of ubiquitin-conjugating machinery. Charge-mediated interactions can also influence proteasome targeting, adding a layer beyond canonical ubiquitin recognition.
Proteasome assembly and abundance control
In simple terms: Cells build more or fewer proteasomes depending on need, using helper proteins.
The 20S core particle and 19S regulatory particle are assembled with the help of dedicated chaperones, and the supply of these assembly factors modulates how much active 26S proteasome exists. Because proteasome abundance directly sets degradation capacity, assembly regulation is a core component of GO:0061136. Structural studies show how the 20S core and 19S particle dock to form the active 26S holoenzyme.
Nuclear import and localization
In simple terms: Proteasomes must be moved to the right place in the cell, especially into the nucleus.
AKIRIN2 controls the nuclear import of proteasomes in vertebrates, demonstrating that subcellular localization is an actively regulated step within this GO term. Localization determines which substrates encounter the proteasome, so import regulation effectively tunes nuclear proteolysis. This spatial control complements ubiquitin-dependent substrate selection.
Catalytic cycle and substrate unfolding
In simple terms: The proteasome pulls the tagged protein inside and chops it into small pieces.
The 19S regulatory particle recognizes ubiquitinated substrates, removes ubiquitin, unfolds the substrate, and translocates it into the 20S core, where threonine proteases cleave peptide bonds. ATP hydrolysis drives these steps, making the process energy-dependent. The logic of the 26S proteasome couples substrate engagement to productive degradation, preventing wasteful cleavage.
Post-translational tuning of proteasome activity
In simple terms: The proteasome itself can be chemically modified to change how well it works.
Reversible modification of proteasome subunits and associated regulators adjusts catalytic output and substrate preference, providing rapid control of catabolic rate. Bacterial proteasomes illustrate how conserved regulatory principles operate across kingdoms. Together, these layers ensure that proteasomal protein catabolism matches cellular demand.
Key Genes Involved in GO:0061136 regulation of proteasomal protein catabolic process
The following genes and proteins are established components or regulators of proteasome-mediated protein catabolism and are commonly studied in the context of GO:0061136.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PSMA1 | 20S core alpha subunit | Core catalytic particle component |
| PSMB5 | 20S core beta subunit | Catalytic subunit and inhibitor target |
| PSMC2 | 19S ATPase subunit | Substrate unfolding and translocation |
| PSMD1 | 19S regulatory particle subunit | Substrate recognition and deubiquitination |
| AKIRIN2 | Nuclear import of proteasomes | Regulates nuclear proteolysis |
| POMP | Proteasome maturation | Assembly chaperone for 20S core |
| PSMG1 | Proteasome assembly chaperone | Controls 20S assembly |
| UBB | Ubiquitin precursor | Substrate tagging for degradation |
| UBC | Ubiquitin precursor | Ubiquitin supply for tagging |
| UBE3A | E3 ubiquitin ligase | Substrate-specific ubiquitination |
| NEDD4 | E3 ubiquitin ligase | Regulates degradation of signaling proteins |
| USP14 | Proteasome-associated deubiquitinase | Recycles ubiquitin and edits chains |
| UCHL5 | Proteasome-associated deubiquitinase | Modulates substrate processing |
| RPN10 | Ubiquitin receptor | Binds ubiquitinated substrates |
| RPN13 | Ubiquitin receptor | Recruits substrates to 19S |
| ECM29 | Proteasome-interacting protein | Links proteasome to ubiquitin substrates |
| BAG6 | Chaperone-like regulator | Assists degradation of misfolded proteins |
How Is regulation of proteasomal protein catabolic process Regulated?
Regulation of proteasomal protein catabolic process is itself regulated at several levels. Substrate availability is controlled by ubiquitination and deubiquitination, so E3 ligases and deubiquitinases set the flux into the proteasome. Proteasome abundance is adjusted through assembly chaperones and transcriptional programs that match degradation capacity to demand. Localization is regulated by dedicated import factors such as AKIRIN2, which controls nuclear proteasome pools. Post-translational modifications of proteasome subunits and associated regulators provide rapid, reversible tuning of catalytic activity. Charge-mediated targeting signals further refine substrate selection. Together these layers allow cells to modulate proteasomal catabolism without changing the core catalytic machinery.
regulation of proteasomal protein catabolic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PSMB5 | Proteasome inhibitor resistance in cancer | Point-mutation knock-in of catalytic subunit |
| AKIRIN2 | Nuclear proteolysis defects | Knockout and tagged knock-in for localization |
| UBE3A | Neurodevelopmental and degradation disorders | Knockout and point-mutation models |
| POMP | Proteasome assembly disorders | Knockout and overexpression models |
| USP14 | Cancer and proteasome regulation | Knockout and inhibitor-response models |
Cancer
Proteasome-mediated degradation controls the abundance of cell-cycle regulators, tumor suppressors, and apoptotic factors, so altered regulation of GO:0061136 can promote or restrain tumor growth. Proteasome inhibitors exploit this dependency in hematologic malignancies, and resistance often involves changes in proteasome regulation.
Inflammatory cell death
Ubiquitination and proteasomal degradation shape inflammatory cell death pathways, including the stability of signaling components that trigger or suppress inflammation. Dysregulated catabolism can therefore amplify or dampen inflammatory responses.
Neurodegeneration
Neurons depend on efficient proteasomal clearance of misfolded proteins, and impaired proteasome regulation is associated with protein aggregation and neurodegeneration. Maintaining proteasome function is considered protective in this context.
Nuclear proteolysis defects
Because AKIRIN2 controls nuclear import of proteasomes, defects in this regulatory route can alter nuclear protein turnover and affect processes that depend on nuclear proteolysis.
From regulation of proteasomal protein catabolic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is a candidate regulator required for proteasomal catabolism? | CRISPR knockout cell line |
| Does a specific catalytic residue control proteasome activity? | Point-mutation knock-in |
| Where does a regulator localize and interact? | Tagged knock-in (e.g., fluorescent or affinity tag) |
| Does increased regulator abundance change degradation flux? | Overexpression cell model |
| Which genes modify proteasome-dependent phenotypes? | CRISPR library screening |
| How does nuclear import of proteasomes change over time? | Live-cell imaging with tagged knock-in |
How to Study the regulation of proteasomal protein catabolic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Mass spectrometry proteomics | Protein abundance and turnover | Global degradation profiling |
| Pulse-chase assay | Half-life of specific proteins | Substrate-specific catabolism |
| Ubiquitin remnant profiling | Ubiquitinated substrates | Substrate identification |
| Co-immunoprecipitation | Proteasome interactors | Regulator discovery |
| Live-cell imaging | Proteasome localization | Nuclear import studies |
| CRISPR knockout screen | Genes modifying phenotype | Regulator discovery |
| Proteasome activity assay | Catalytic activity | Functional validation |
Proteomics and degradation assays
Mass spectrometry-based proteomics and pulse-chase degradation assays quantify how fast specific proteins are cleared and how proteasome composition changes, providing direct readouts of GO:0061136 activity.
Ubiquitin and interactome profiling
Ubiquitin remnant profiling and proteasome interactome studies identify substrates and regulators, linking ubiquitination state to catabolic flux.
Imaging and localization
Fluorescently tagged proteasome subunits and import factors allow live-cell tracking of proteasome localization, including nuclear import controlled by AKIRIN2.
Genetic screening
CRISPR knockout and activation screens identify genes that modify proteasome-dependent phenotypes, revealing new regulators within GO:0061136.
How CRISPR Can Be Used to Study GO:0061136 regulation of proteasomal protein catabolic process
Knockout
CRISPR knockout of candidate regulators such as AKIRIN2 or assembly chaperones tests whether they are required for proteasomal catabolism and for downstream phenotypes. Knockout models also reveal compensatory changes in proteasome abundance.
Point Mutation
Point-mutation knock-in of catalytic or regulatory residues in proteasome subunits allows precise testing of mechanism without removing the protein, as illustrated by structural and functional studies of the 26S proteasome.
Knock-in
Tagged knock-in of proteasome subunits or regulators enables localization and interaction studies, including tracking nuclear import controlled by AKIRIN2.
Overexpression
Overexpression of proteasome subunits or regulators tests sufficiency: does increasing abundance or activity raise degradation flux and alter disease-relevant phenotypes?
How EDITGENE Supports regulation of proteasomal protein catabolic process Research
Researchers studying regulation of proteasomal protein catabolic process-related genes often need to determine whether a candidate gene is causally involved in proteasome-dependent degradation or is merely correlated with it. EDITGENE provides the CRISPR models and screening services required to move from correlation to causation.
Contact EDITGENE today to design your custom CRISPR model for regulation of proteasomal protein catabolic process research.
Frequently Asked Questions About regulation of proteasomal protein catabolic process
What is GO:0061136?
GO:0061136 is the biological_process term regulation of proteasomal protein catabolic process, which covers any process that modulates the rate, frequency, or extent of proteasome-mediated protein breakdown.
What does regulation of proteasomal protein catabolic process do?
It controls how quickly and completely the proteasome degrades proteins, influencing cell-cycle, immune, and stress responses.
What genes are involved in regulation of proteasomal protein catabolic process?
Key genes include PSMA1, PSMB5, PSMC2, PSMD1, AKIRIN2, POMP, PSMG1, UBB, UBC, and USP14.
Why is regulation of proteasomal protein catabolic process important in cancer?
It controls the stability of cell-cycle regulators and apoptotic factors, and proteasome inhibitors are used in hematologic malignancies.
How is the proteasome regulated?
Regulation occurs through substrate ubiquitination, proteasome assembly, nuclear import, and post-translational modification of subunits.
What is the role of AKIRIN2 in this process?
AKIRIN2 controls the nuclear import of proteasomes in vertebrates, regulating nuclear proteolysis.
Which diseases are linked to proteasome regulation?
Cancer, inflammatory cell death, and neurodegeneration are linked to altered proteasome regulation.
How do researchers study GO:0061136?
They use proteomics, pulse-chase assays, ubiquitin profiling, imaging, and CRISPR screens.
What CRISPR models are useful for studying proteasome regulation?
Knockout, point-mutation, knock-in, and overexpression models are all useful for causal testing.
Is the proteasome conserved across species?
Yes, proteasomes are found from bacteria to humans, enabling comparative studies.
Conclusion
GO:0061136, regulation of proteasomal protein catabolic process, is a central control point in proteostasis that integrates ubiquitin signaling, proteasome assembly, localization, and catalytic tuning. Its dysregulation contributes to cancer, inflammatory cell death, and neurodegeneration, making it a high-value area for mechanistic and therapeutic research. CRISPR-based knockout, point-mutation, knock-in, overexpression, and screening models provide the causal tools needed to dissect this regulatory network.
References
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- 2. Collins GA et al.. 2017. The Logic of the 26S Proteasome.. Cell 169(5):792-806 PMID: 28525752
- 3. Cockram PE et al.. 2021. Ubiquitination in the regulation of inflammatory cell death and cancer.. Cell Death Differ 28(2):591-605 PMID: 33432113
- 4. de Almeida M et al.. 2021. AKIRIN2 controls the nuclear import of proteasomes in vertebrates.. Nature 599(7885):491-496 PMID: 34711951
- 5. Dahlmann B. 2005. Proteasomes.. Essays Biochem 41:31-48 PMID: 16250896
- 6. Gu ZC et al.. 2014. Proteasome assembly.. Cell Mol Life Sci 71(24):4729-45 PMID: 25107634
- 7. Jastrab JB et al.. 2015. Bacterial Proteasomes.. Annu Rev Microbiol 69:109-27 PMID: 26488274
- 8. Kudriaeva A et al.. 2019. Charge-mediated proteasome targeting.. FASEB J 33(6):6852-6866 PMID: 30811957
