GO:0071947 protein deubiquitination involved in ubiquitin-dependent protein catabolic process: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0071947 describes the removal of ubiquitin groups from a protein as part of ubiquitin-dependent protein catabolism, a process essential for proteasomal degradation and protein quality control.
• Deubiquitinating enzymes (DUBs) such as OTUD3 and USP8 reverse ubiquitination, thereby regulating protein stability and cellular homeostasis [1, 6].
• The ubiquitin-proteasome system, including deubiquitination, is a validated target for anti-cancer therapies and is implicated in ischemic heart and brain injury [3, 4].
• Dysregulation of deubiquitination contributes to cancer, metabolic disorders, and cardiovascular diseases by altering the half-life of key regulatory proteins [1, 3, 5].
• CRISPR-based knockout, point mutation, and knock-in models enable precise interrogation of DUB function in ubiquitin-dependent catabolism [1, 6].
• Studying GO:0071947 requires integrating proteomics, ubiquitin chain profiling, and functional assays to link deubiquitination to substrate fate [2, 7].
Description
Protein deubiquitination involved in ubiquitin-dependent protein catabolic process (GO:0071947) is a biological process that removes ubiquitin moieties from target proteins, thereby influencing their degradation via the ubiquitin-proteasome system. This process is critical for maintaining proteostasis, regulating cell cycle progression, and controlling signal transduction pathways [2, 4]. Deubiquitinating enzymes (DUBs) counteract the action of E3 ubiquitin ligases, ensuring that ubiquitination is a reversible and dynamic modification [1, 6]. The importance of this process is underscored by its involvement in diverse pathologies, including cancer, metabolic disorders, and ischemic injury [1, 3, 4]. Understanding the molecular players and regulatory mechanisms of GO:0071947 is essential for developing targeted therapies that modulate protein stability [5, 7].
protein deubiquitination involved in ubiquitin-dependent protein catabolic process At A Glance
| GO ID | GO:0071947 |
|---|---|
| GO term | protein deubiquitination involved in ubiquitin-dependent protein catabolic process |
| Ontology | biological_process |
| Synonym | none |
| Major function | Removal of ubiquitin groups from proteins destined for degradation, regulating protein stability and turnover. |
| Related processes | Ubiquitin-dependent protein catabolism, proteasomal degradation, protein quality control [2, 4]. |
| Key enzymes | Deubiquitinating enzymes (DUBs) such as OTUD3, USP8, and others [1, 6]. |
| Disease relevance | Cancer, metabolic disorders, cardiovascular and neurodegenerative diseases [1, 3, 4]. |
What Is GO:0071947?
GO:0071947 is defined as the removal of one or more ubiquitin groups from a protein as part of a process of ubiquitin-dependent protein catabolism. In other words, it is the deubiquitination step that occurs within the broader context of protein degradation mediated by the ubiquitin-proteasome system. This process ensures that ubiquitin chains are edited or removed to control the fate of substrate proteins, either rescuing them from degradation or facilitating their entry into the proteasome.
Why Is protein deubiquitination involved in ubiquitin-dependent protein catabolic process Important in Cell Biology?
GO:0071947 is fundamental to cellular proteostasis because it determines the fate of ubiquitinated proteins, directly impacting processes such as cell cycle regulation, apoptosis, and stress responses [2, 4]. Dysregulation of deubiquitination can lead to the accumulation of oncoproteins or the premature degradation of tumor suppressors, contributing to cancer initiation and progression [1, 4]. Moreover, deubiquitinating enzymes are emerging as promising therapeutic targets, with inhibitors being developed for cancer and other diseases [4, 7]. Understanding this process at the molecular level is therefore crucial for both basic biology and translational medicine.
• Regulates protein half-life and abundance, affecting virtually all cellular pathways.
• Controls the degradation of key signaling molecules, including receptors and transcription factors [5, 6].
• Plays a role in the DNA damage response by modulating nucleotide excision repair proteins.
• Influences metabolic homeostasis in response to nutritional stresses.
• Contributes to the pathogenesis of ischemic heart and brain injury through ferroptosis regulation.
• Is a target for anti-cancer therapies aimed at the 26S proteasome and DUBs.
• Modulates Wnt signaling by affecting the stability of coreceptors such as LRP6.
• Affects immune response and inflammation by regulating NF-kB signaling.
• Is essential for neuronal survival and function, with implications for neurodegeneration.
What Happens During protein deubiquitination involved in ubiquitin-dependent protein catabolic process?
Recognition of Ubiquitinated Substrates
In simple terms: DUBs find and bind to proteins that have been tagged with ubiquitin.
The process begins when a deubiquitinating enzyme (DUB) recognizes a specific ubiquitinated substrate. This recognition often involves interactions with the ubiquitin chain or the substrate itself, and can be regulated by adaptor proteins. For example, OTUD3 specifically binds to and deubiquitinates certain metabolic regulators.
Cleavage of Ubiquitin Chains
In simple terms: The DUB cuts the ubiquitin chain off the target protein.
DUBs catalyze the hydrolysis of the isopeptide bond between the C-terminal glycine of ubiquitin and a lysine residue on the substrate or on another ubiquitin molecule. This cleavage can remove entire chains or trim them to alter the degradation signal. USP8, for instance, deubiquitinates and stabilizes connexin 43 by removing polyubiquitin chains.
Regulation of Substrate Fate
In simple terms: Removing ubiquitin can save the protein from degradation or change its function.
Deubiquitination can rescue a protein from proteasomal degradation, as seen with USP8-mediated stabilization of Cx43. Alternatively, it can edit ubiquitin chains to modulate signaling outcomes, such as in the Wnt pathway where LRP6 folding and stability are influenced by ubiquitination dynamics.
Coupling to Proteasomal Degradation
In simple terms: If ubiquitin remains, the protein is sent to the proteasome for destruction.
When deubiquitination does not occur or is insufficient, polyubiquitinated proteins are recognized by the 26S proteasome and degraded. The balance between ubiquitination and deubiquitination determines whether a protein is degraded or spared, a decision critical for cellular homeostasis.
Recycling of Ubiquitin
In simple terms: Ubiquitin molecules are reused after being removed.
DUBs generate free ubiquitin monomers that can be re-conjugated to new substrates, maintaining the cellular pool of ubiquitin. This recycling is essential for sustained ubiquitin-dependent processes under stress conditions.
Key Genes Involved in GO:0071947 protein deubiquitination involved in ubiquitin-dependent protein catabolic process
The following genes encode deubiquitinating enzymes, ubiquitin ligases, and related factors that directly participate in or regulate GO:0071947.
| Gene | Major Role | Research Relevance |
|---|---|---|
| OTUD3 | Deubiquitinase that regulates metabolic homeostasis | Linked to nutritional stress responses and metabolic disorders |
| USP8 | Deubiquitinates and stabilizes Cx43 | Implicated in cardiac arrhythmias and cancer |
| USP7 | Deubiquitinates MDM2 and p53 | Target in cancer therapy |
| USP14 | Proteasome-associated DUB | Regulates proteasome activity and is a drug target |
| UCHL5 | Proteasome-associated DUB | Modulates degradation of ubiquitinated proteins |
| PSMD14 | Proteasome subunit with DUB activity | Essential for proteasome function |
| RPN11 | Proteasome lid DUB | Required for substrate deubiquitination before degradation |
| UBB | Ubiquitin precursor | Provides ubiquitin monomers for conjugation |
| UBC | Ubiquitin precursor | Polyubiquitin gene involved in stress responses |
| NEDD4 | E3 ubiquitin ligase | Opposes DUBs in substrate regulation |
| SMURF1 | E3 ubiquitin ligase | Regulates Wnt signaling and LRP6 |
| LRP6 | Wnt coreceptor | Ubiquitination and folding regulated by DUBs |
| CX43 | Gap junction protein | Stabilized by USP8-mediated deubiquitination |
| GCGR | Glucagon receptor | Ubiquitination status determines signal bias |
| XPC | DNA damage recognition protein | Regulated by ubiquitination in nucleotide excision repair |
| KEAP1 | E3 ligase adaptor | Regulates NRF2 stability via ubiquitination |
| NRF2 | Transcription factor | Ferroptosis regulation via ubiquitination |
How Is protein deubiquitination involved in ubiquitin-dependent protein catabolic process Regulated?
The process of protein deubiquitination involved in ubiquitin-dependent protein catabolic process is tightly regulated at multiple levels. DUB activity can be controlled by post-translational modifications, such as phosphorylation, and by interaction with adaptor proteins. For instance, OTUD3 activity is modulated in response to nutritional stresses, linking deubiquitination to metabolic signaling. Additionally, the ubiquitination status of the glucagon receptor determines signal bias, highlighting how deubiquitination can influence G protein-coupled receptor signaling. The proteasome itself contains DUBs like RPN11 and USP14 that are regulated by the ubiquitin chain architecture and substrate flux [2, 4].
protein deubiquitination involved in ubiquitin-dependent protein catabolic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| OTUD3 | Metabolic disorders, cancer | OTUD3 knockout mice, cell lines |
| USP8 | Cardiac arrhythmias, Cushing's disease | USP8 knockout or overexpression in cardiomyocytes |
| LRP6 | Wnt-related cancers, bone density | LRP6 knock-in mutations in cell lines |
| GCGR | Type 2 diabetes | GCGR point mutations to alter ubiquitination sites |
| XPC | Xeroderma pigmentosum | XPC knockout cells for DNA repair studies |
Cancer
Dysregulation of deubiquitination is frequently observed in cancer. Overexpression of DUBs such as USP7 can lead to stabilization of oncoproteins or degradation of tumor suppressors, promoting tumorigenesis. Targeting DUBs and the proteasome has emerged as a therapeutic strategy, with inhibitors like bortezomib used in multiple myeloma. OTUD3 has been implicated in metabolic reprogramming of cancer cells, further linking deubiquitination to cancer metabolism.
Cardiovascular and Ischemic Injury
Ubiquitination-dependent regulation of ferroptosis plays a critical role in ischemic heart and brain injury. Deubiquitination enzymes can modulate ferroptosis by stabilizing or degrading key regulators such as NRF2, thereby influencing cell survival during ischemia-reperfusion. This highlights the potential of targeting deubiquitination for cardioprotection and neuroprotection.
Metabolic Disorders
OTUD3 regulates metabolic homeostasis in response to nutritional stresses, and its dysfunction may contribute to obesity and diabetes. The glucagon receptor's ubiquitination status affects signal bias, which can impact glucose metabolism and energy balance. Thus, deubiquitination is a key node in metabolic regulation.
From protein deubiquitination involved in ubiquitin-dependent protein catabolic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does OTUD3 regulate metabolic homeostasis? | OTUD3 knockout mouse and cell lines |
| How does USP8-mediated deubiquitination affect Cx43 stability? | USP8 overexpression and knockout in cardiac cells |
| What is the role of LRP6 ubiquitination in Wnt signaling? | LRP6 point mutants lacking ubiquitination sites |
| How does GCGR ubiquitination influence signal bias? | GCGR knock-in with mutated ubiquitin acceptor lysines |
| Does proteasome-associated DUB activity change with disease? | Proteasome inhibitors in cancer cell lines |
| Can deubiquitination modulate ferroptosis in ischemia? | In vivo ischemia models with DUB knockout |
How to Study the protein deubiquitination involved in ubiquitin-dependent protein catabolic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Ubiquitin chain profiling by mass spectrometry | Types and abundance of ubiquitin linkages | Characterizing DUB specificity |
| Co-immunoprecipitation | Protein-protein interactions | Identifying DUB-substrate complexes |
| Cycloheximide chase | Protein half-life | Assessing stabilization by DUBs |
| CRISPR knockout screening | Gene essentiality and pathway components | Discovering regulators of deubiquitination |
| Proteasome activity assay | Proteolytic activity | Evaluating proteasome function |
| RNA-seq | Transcriptional changes | Measuring cellular response to DUB perturbation |
| Immunoblotting | Protein levels and ubiquitination status | Validating substrate degradation |
| Fluorescence microscopy | Subcellular localization | Visualizing DUB and substrate co-localization |
Ubiquitin Chain Profiling
Mass spectrometry-based ubiquitin chain profiling can identify the types of ubiquitin linkages on substrates and how they are removed by DUBs. This method is essential for understanding the specificity of deubiquitination in GO:0071947.
Proteomics and Interactomics
Affinity purification coupled with mass spectrometry can identify DUB-substrate interactions and dynamic changes in the ubiquitinome upon DUB perturbation [1, 6]. This helps map the network of proteins regulated by deubiquitination.
Functional Assays for Protein Stability
Cycloheximide chase assays and pulse-chase labeling measure the half-life of candidate substrates in the presence or absence of DUB activity. These assays directly test the impact of deubiquitination on protein catabolism.
CRISPR Screening
Genome-wide CRISPR knockout screens can identify DUBs that regulate the stability of a reporter protein or confer resistance to proteasome inhibitors. This unbiased approach reveals novel components of GO:0071947.
How CRISPR Can Be Used to Study GO:0071947 protein deubiquitination involved in ubiquitin-dependent protein catabolic process
Knockout
CRISPR knockout of DUB genes such as OTUD3 or USP8 allows researchers to assess their necessity in ubiquitin-dependent catabolism. For example, OTUD3 knockout mice exhibit altered metabolic homeostasis under nutritional stress. Knockout cell lines can be used to measure changes in substrate stability and ubiquitination.
Point Mutation
Introducing point mutations in the catalytic domain of DUBs or in ubiquitin acceptor sites of substrates can dissect the molecular mechanism of deubiquitination. For instance, mutating the catalytic cysteine of USP8 abolishes its deubiquitinase activity, leading to Cx43 degradation. Similarly, point mutations in GCGR ubiquitination sites alter signal bias.
Knock-in
Knock-in of tagged DUBs (e.g., HA- or GFP-tagged) enables endogenous expression and interaction studies. Tagged knock-in of LRP6 can help track its ubiquitination and folding in Wnt signaling. This approach preserves physiological regulation while allowing biochemical analysis.
Overexpression
Overexpression of DUBs or their substrates can reveal gain-of-function phenotypes. For example, overexpression of USP8 stabilizes Cx43 and increases gap junction communication. Overexpression of OTUD3 modulates metabolic gene expression. These models are useful for screening inhibitors or studying downstream effects.
How EDITGENE Supports protein deubiquitination involved in ubiquitin-dependent protein catabolic process Research
Researchers studying protein deubiquitination involved in ubiquitin-dependent protein catabolic process-related genes often need to determine whether a candidate gene is causally involved in substrate stabilization, degradation, or disease progression. EDITGENE provides comprehensive CRISPR-based services to generate precisely engineered cell models, enabling functional validation of DUBs and their substrates.
Contact EDITGENE today to design your custom CRISPR model for protein deubiquitination involved in ubiquitin-dependent protein catabolic process research.
Frequently Asked Questions About protein deubiquitination involved in ubiquitin-dependent protein catabolic process
What is GO:0071947?
GO:0071947 is a Gene Ontology biological process term for the removal of ubiquitin groups from a protein as part of ubiquitin-dependent protein catabolism.
What genes are involved in protein deubiquitination involved in ubiquitin-dependent protein catabolic process?
Key genes include OTUD3, USP8, USP7, USP14, UCHL5, PSMD14, and RPN11, among others [1, 2, 4, 6].
How does deubiquitination affect protein degradation?
Deubiquitination can rescue proteins from proteasomal degradation or edit ubiquitin chains to modulate signaling, thereby controlling protein half-life [2, 6].
What diseases are linked to defects in deubiquitination?
Cancers, metabolic disorders, cardiovascular diseases, and neurodegenerative conditions have been linked to dysregulated deubiquitination [1, 3, 4].
Which deubiquitinase regulates Cx43 stability?
USP8 deubiquitinates and stabilizes Cx43, affecting gap junction function.
How is OTUD3 involved in metabolism?
OTUD3 regulates metabolic homeostasis in response to nutritional stresses, and its loss leads to metabolic dysfunction.
Can CRISPR be used to study deubiquitination?
Yes, CRISPR knockout, point mutation, and knock-in models enable precise interrogation of DUB function in ubiquitin-dependent catabolism [1, 6].
What is the role of the proteasome in deubiquitination?
The proteasome contains DUBs like RPN11 and USP14 that remove ubiquitin chains before substrate degradation, recycling ubiquitin [2, 4].
How does ubiquitination regulate ferroptosis?
Ubiquitination-dependent regulation of ferroptosis involves deubiquitinases that modulate the stability of key regulators like NRF2, impacting ischemic injury.
What methods are used to study deubiquitination?
Common methods include ubiquitin chain profiling, co-immunoprecipitation, cycloheximide chase, and CRISPR screens [2, 4, 6].
Conclusion
GO:0071947, protein deubiquitination involved in ubiquitin-dependent protein catabolic process, is a central regulatory mechanism that controls protein stability and cellular homeostasis. Its dysregulation contributes to cancer, metabolic disorders, and cardiovascular diseases, making it a compelling target for therapeutic intervention [1, 3, 4]. Advances in CRISPR-based models and proteomic technologies are accelerating our understanding of DUB biology and opening new avenues for drug discovery [2, 6].
References
- 1. Zhou N et al.. 2022. Deubiquitinase OTUD3 regulates metabolism homeostasis in response to nutritional stresses.. Cell Metab 34(7):1023-1041.e8 PMID: 35675826
- 2. Kudriaeva AA et al.. 2019. Proteasome: a Nanomachinery of Creative Destruction.. Biochemistry (Mosc) 84(Suppl 1):S159-S192 PMID: 31213201
- 3. Zhang YY et al.. 2026. Ubiquitination-dependent regulation of ferroptosis in ischemic heart and brain.. Redox Biol 95:104249 PMID: 42263416
- 4. Grigoreva TA et al.. 2015. The 26S proteasome is a multifaceted target for anti-cancer therapies.. Oncotarget 6(28):24733-49 PMID: 26295307
- 5. Kaur S et al.. 2023. The ubiquitination status of the glucagon receptor determines signal bias.. J Biol Chem 299(5):104690 PMID: 37037304
- 6. Sun J et al.. 2018. The ubiquitin-specific protease USP8 deubiquitinates and stabilizes Cx43.. J Biol Chem 293(21):8275-8284 PMID: 29626091
- 7. Chauhan AK et al.. 2021. Timely upstream events regulating nucleotide excision repair by ubiquitin-proteasome system: ubiquitin guides the way.. DNA Repair (Amst) 103:103128 PMID: 33991872
- 8. Perrody E et al.. 2016. Ubiquitin-dependent folding of the Wnt signaling coreceptor LRP6.. Elife 5 PMID: 27751231
