GO:1904667 negative regulation of ubiquitin protein ligase activity: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1904667 describes any process that stops, prevents or reduces the frequency, rate or extent of ubiquitin protein ligase (E3) activity.
• Negative regulation of E3 ligases is essential for controlling protein stability, signal transduction, and immune responses.
• Key mechanisms include phosphorylation-induced conformational changes, sequestration by autophagy adaptors, and direct binding of inhibitory proteins.
• Dysregulation of E3 negative regulation is linked to cancer, immune disorders, and developmental defects.
• CRISPR knockout, point mutation, knock-in, and overexpression models are powerful tools to dissect E3 regulatory networks.
• EDITGENE provides end-to-end CRISPR services to study negative regulation of ubiquitin protein ligase activity in any cell type.
Description
The ubiquitin-proteasome system governs nearly every cellular process by tagging proteins for degradation or altering their function. Central to this system are ubiquitin protein ligases (E3s), which confer substrate specificity. The activity of E3 ligases must be tightly controlled; otherwise, inappropriate protein turnover can drive disease. GO:1904667, negative regulation of ubiquitin protein ligase activity, encompasses all molecular events that dampen E3 catalytic function. This regulation is achieved through diverse mechanisms, including post-translational modifications, protein-protein interactions, and subcellular sequestration. Understanding these processes is critical for basic biology and for developing therapeutics that target E3 ligases in cancer, autoimmunity, and neurodegeneration.
negative regulation of ubiquitin protein ligase activity At A Glance
| GO ID | GO:1904667 |
|---|---|
| GO term | negative regulation of ubiquitin protein ligase activity |
| Ontology | biological_process |
| Synonym | inhibition of E3; downregulation of ubiquitin ligase activity; negative regulation of protein ubiquitination activity |
| Major function | Suppression of E3 ubiquitin ligase catalytic activity, impacting protein stability and signaling |
| Related processes | Protein ubiquitination, proteasomal degradation, immune signaling, cell cycle control |
| Key regulators | Cbl-b, SMURF1, RNF114, UBR5, NBR1-p62/SQSTM1, LINCR |
| Disease relevance | Cancer, autoimmune disorders, inflammatory diseases, developmental abnormalities |
What Is GO:1904667?
According to the Gene Ontology, GO:1904667 (negative regulation of ubiquitin protein ligase activity) is defined as any process that stops, prevents or reduces the frequency, rate or extent of ubiquitin protein ligase activity. In other words, it includes all biological mechanisms that inhibit the ability of E3 enzymes to transfer ubiquitin to substrate proteins, thereby modulating protein degradation, localization, or function.
Why Is negative regulation of ubiquitin protein ligase activity Important in Cell Biology?
Negative regulation of ubiquitin protein ligase activity is a fundamental control point in cell signaling and proteostasis. Without it, unchecked E3 activity could lead to premature degradation of critical proteins, disrupting immune responses, cell cycle progression, and stress adaptation. Moreover, many pathogens and cancer cells exploit these regulatory mechanisms to evade host defenses or promote survival. Thus, understanding how E3 ligases are negatively regulated offers insights into disease pathogenesis and potential therapeutic targets.
• Prevents inappropriate degradation of signaling molecules, maintaining immune homeostasis.
• Controls the duration and intensity of NF-kB and TLR signaling.
• Regulates cell cycle progression by modulating APC/C activity.
• Influences cancer metastasis through sequestration of E3 ligases like ITCH.
• Modulates hormone receptor stability via UBR5 complexes.
• Impacts development by fine-tuning SMURF1 activity.
• Provides a layer of regulation for protein quality control.
• Offers drug targets for inflammatory and neoplastic diseases.
What Happens During negative regulation of ubiquitin protein ligase activity?
Phosphorylation-induced conformational changes
In simple terms: Adding a phosphate group can switch an E3 ligase into an inactive shape.
Phosphorylation of E3 ligases such as c-Cbl can induce conformational changes that either activate or inhibit their ligase activity. For example, phosphorylation of c-Cbl by Src family kinases leads to a conformational change that enhances its activity, but subsequent dephosphorylation or binding of inhibitory proteins can reverse this. In the context of negative regulation, phosphorylation of specific residues can recruit inhibitory proteins or disrupt essential interactions, thereby reducing ubiquitin transfer.
Sequestration by autophagy adaptors
In simple terms: Autophagy proteins can grab E3 ligases and hold them away from their targets.
The autophagy adaptor NBR1 and p62/SQSTM1 can form complexes that sequester the E3 ligase ITCH, preventing it from ubiquitinating substrates. This sequestration promotes breast cancer metastasis by stabilizing ITCH targets. This mechanism illustrates how negative regulation can occur through spatial separation rather than direct inhibition of catalytic activity.
Direct binding of inhibitory proteins
In simple terms: Some proteins bind to E3 ligases and block their active site or substrate recruitment.
Proteins such as RNF114 can negatively regulate RLH signaling by binding to and inhibiting the E3 ligase activity of other components, thereby preventing excessive immune activation. Similarly, Cbl-b acts as a negative regulator of FcεRI-mediated mast cell activation by limiting the activity of downstream E3 ligases.
Regulation by ubiquitin-like modifications
In simple terms: Attachment of ubiquitin-like molecules can shut down E3 ligase function.
Modification of E3 ligases by ubiquitin-like proteins such as SUMO or NEDD8 can alter their activity. For instance, neddylation of cullin-RING ligases is required for their activity, and de-neddylation by the COP9 signalosome negatively regulates their function. This process is a key example of negative regulation of ubiquitin protein ligase activity.
Transcriptional and post-transcriptional control
In simple terms: Cells can reduce the amount of E3 ligase mRNA or protein available.
Negative regulation can also occur by decreasing E3 ligase expression. For example, microRNAs or transcriptional repressors can lower mRNA levels of E3 ligases, leading to reduced ligase activity. While not directly inhibiting existing enzyme molecules, this mechanism effectively reduces overall ubiquitin ligase activity and falls under GO:1904667.
Key Genes Involved in GO:1904667 negative regulation of ubiquitin protein ligase activity
The following genes and proteins are experimentally validated participants in negative regulation of ubiquitin protein ligase activity, as supported by the cited literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CBLB | E3 ligase that negatively regulates mast cell activation | Autoimmunity, allergy |
| SMURF1 | E3 ligase regulated by inhibitory proteins | Bone development, cancer |
| RNF114 | Negatively regulates RLH signaling | Antiviral immunity |
| UBR5 | Forms chromatin complexes regulating hormone receptors | Breast cancer, nuclear receptor signaling |
| NBR1 | Autophagy adaptor sequestering ITCH | Breast cancer metastasis |
| SQSTM1 | Autophagy adaptor sequestering ITCH | Breast cancer metastasis |
| ITCH | E3 ligase negatively regulated by sequestration | Cancer, immune regulation |
| CBL | E3 ligase regulated by phosphorylation | Signal transduction |
| LINCR | E3 ligase that amplifies TLR signals | Inflammation |
| MKP1 | Target of LINCR, involved in TLR signaling | Inflammation |
| APC/C | Ubiquitin ligase complex negatively regulated during mitosis | Cell cycle |
| CDC20 | Activator of APC/C, subject to negative regulation | Cell cycle |
| FZR1 | Activator of APC/C, subject to negative regulation | Cell cycle |
| COP9 signalosome | Deneddylase that negatively regulates cullin-RING ligases | Protein degradation |
| Cullin-RING ligases | E3 complexes regulated by neddylation/deneddylation | Cancer, development |
How Is negative regulation of ubiquitin protein ligase activity Regulated?
Negative regulation of ubiquitin protein ligase activity is itself tightly regulated. For example, the COP9 signalosome removes NEDD8 from cullin-RING ligases, thereby inhibiting their activity. Phosphorylation of c-Cbl by Src kinases can either activate or inhibit its ligase function depending on the site. Autophagy adaptors like NBR1 and p62/SQSTM1 are induced under stress conditions and sequester ITCH, linking autophagy to E3 regulation. Additionally, TLR signaling induces LINCR, which degrades MKP1, but negative feedback loops may limit this activity. These layers of regulation ensure precise control of protein ubiquitination in response to cellular cues.
negative regulation of ubiquitin protein ligase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CBLB | Allergy, autoimmunity | Knockout mouse, mast cell lines |
| SMURF1 | Cancer, bone disorders | Overexpression in osteosarcoma cells |
| UBR5 | Breast cancer | Knockout in breast cancer cell lines |
| NBR1/SQSTM1 | Breast cancer metastasis | Knockdown in metastatic breast cancer cells |
| ITCH | Cancer, immune dysregulation | Point mutation of sequestration domain |
Cancer
Dysregulation of E3 ligase negative regulation contributes to cancer. For instance, sequestration of ITCH by NBR1-p62/SQSTM1 complexes promotes breast cancer metastasis by stabilizing oncogenic ITCH substrates. UBR5 forms ligand-dependent complexes on chromatin that regulate nuclear hormone receptor stability, and its dysfunction is linked to breast cancer. SMURF1, an E3 ligase, is often overexpressed in cancers, and its negative regulation is critical for preventing excessive degradation of tumor suppressors.
Immune and inflammatory disorders
Negative regulation of E3 ligases is essential for preventing autoimmunity. Cbl-b negatively regulates FcεRI-mediated mast cell activation, and its loss leads to hyperresponsiveness and allergy. RNF114 negatively regulates RLH signaling, and its dysregulation can cause excessive antiviral responses. LINCR amplifies TLR-mediated signals by degrading MKP1, but negative feedback is necessary to avoid chronic inflammation.
Developmental and cell cycle defects
The anaphase-promoting complex/cyclosome (APC/C) is a ubiquitin ligase that must be negatively regulated during mitosis to ensure proper chromosome segregation. Failure of this regulation can lead to aneuploidy and developmental defects. SMURF1 regulation is also critical for bone morphogenetic protein (BMP) signaling and skeletal development.
From negative regulation of ubiquitin protein ligase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of Cbl-b enhance mast cell activation? | Cblb knockout mouse or human mast cell line |
| How does phosphorylation regulate c-Cbl activity? | Point mutation (Y to E) knock-in in cell lines |
| What is the impact of UBR5 chromatin binding on hormone receptor stability? | Knock-in of tagged UBR5 in breast cancer cells |
| Can NBR1 sequestration of ITCH be disrupted? | Overexpression of NBR1 mutants in cancer cells |
| Does SMURF1 negative regulation affect BMP signaling? | SMURF1 knockout in osteoblasts |
| How does LINCR degradation of MKP1 affect TLR signaling? | LINCR overexpression in macrophages |
How to Study the negative regulation of ubiquitin protein ligase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Ubiquitinome profiling | Global changes in ubiquitination | Knockout of E3 negative regulators |
| Phosphoproteomics | Phosphorylation sites on E3 ligases | Studying c-Cbl regulation |
| CRISPR knockout screen | Genes affecting E3 activity | Identifying novel negative regulators |
| Live-cell imaging | Subcellular localization and dynamics | Sequestration of ITCH by NBR1 |
| Co-immunoprecipitation | Protein-protein interactions | Detecting inhibitory complexes |
| In vitro ubiquitination assay | Direct E3 ligase activity | Testing inhibitory proteins |
| RNA-seq | Transcriptional changes | E3 ligase expression profiling |
Proteomics and ubiquitinome analysis
Mass spectrometry-based proteomics can quantify ubiquitination changes upon modulation of E3 ligase negative regulators. For example, ubiquitin remnant profiling after knockout of Cbl-b or SMURF1 reveals altered substrate degradation.
Phosphoproteomics
Phosphoproteomics identifies phosphorylation events on E3 ligases that regulate their activity. This is particularly useful for studying c-Cbl regulation by Src kinases.
CRISPR screens
Genome-wide CRISPR knockout screens can identify genes whose loss enhances or suppresses E3 ligase activity. Such screens have uncovered negative regulators like RNF114 in immune signaling.
Live-cell imaging
Fluorescently tagged E3 ligases and substrates allow real-time monitoring of ubiquitination and degradation. This can reveal sequestration mechanisms, such as NBR1-mediated ITCH relocalization.
How CRISPR Can Be Used to Study GO:1904667 negative regulation of ubiquitin protein ligase activity
Knockout
CRISPR knockout of genes encoding negative regulators of E3 ligases (e.g., Cblb, Rnf114) can reveal their role in immune signaling and cancer. For example, Cblb knockout mice show enhanced mast cell activation.
Point Mutation
Introducing point mutations in E3 ligases (e.g., c-Cbl tyrosine to glutamate) can mimic phosphorylation and alter activity, helping dissect regulatory mechanisms.
Knock-in
Knock-in of tagged E3 ligases (e.g., UBR5) allows chromatin immunoprecipitation and proteomic studies to understand how they are negatively regulated on chromatin.
Overexpression
Overexpression of negative regulators like NBR1 or p62/SQSTM1 can sequester E3 ligases and block substrate ubiquitination, providing a gain-of-function model for metastasis studies.
How EDITGENE Supports negative regulation of ubiquitin protein ligase activity Research
Researchers studying negative regulation of ubiquitin protein ligase activity-related genes often need to determine whether a candidate gene is causally involved in a specific signaling pathway or disease. This requires precise genetic manipulation, which is where EDITGENE's CRISPR services can accelerate discovery.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of ubiquitin protein ligase activity research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| USP44 Knockout HEK293 Cell Line | EDJ-KQ9980 | Human | 84101 | Details Get a Quote |
| FBXO5 Knockout HEK293 Cell Line | EDJ-KQ51176 | Human | 26271 | Details Get a Quote |
| FBXO5 Knockout HeLa Cell Line | EDJ-KQ55917 | Human | 26271 | Details Get a Quote |
| USP44 Knockout HeLa Cell Line | EDJ-KQ57533 | Human | 84101 | Details Get a Quote |
| FBXO5 Knockout A-549 Cell Line | EDJ-KQ64407 | Human | 26271 | Details Get a Quote |
| USP44 Knockout A-549 Cell Line | EDJ-KQ66031 | Human | 84101 | Details Get a Quote |
| FBXO5 Knockout HCT 116 Cell Line | EDJ-KQ72859 | Human | 26271 | Details Get a Quote |
| USP44 Knockout HCT 116 Cell Line | EDJ-KQ74455 | Human | 84101 | Details Get a Quote |
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Frequently Asked Questions About negative regulation of ubiquitin protein ligase activity
What is negative regulation of ubiquitin protein ligase activity?
It is any process that reduces the frequency, rate, or extent of ubiquitin protein ligase (E3) activity, as defined by GO:1904667.
What genes are involved in negative regulation of ubiquitin protein ligase activity?
Key genes include CBLB, SMURF1, RNF114, UBR5, NBR1, SQSTM1, ITCH, CBL, and LINCR, among others.
How is E3 ligase activity negatively regulated?
Mechanisms include phosphorylation-induced conformational changes, sequestration by autophagy adaptors, direct binding of inhibitory proteins, and ubiquitin-like modifications.
What diseases are linked to dysregulated E3 negative regulation?
Cancer, autoimmune disorders, inflammatory diseases, and developmental defects.
What is the role of Cbl-b in immune regulation?
Cbl-b negatively regulates FcεRI-mediated mast cell activation, preventing excessive allergic responses.
How does NBR1 regulate ITCH?
NBR1 and p62/SQSTM1 form complexes that sequester ITCH, preventing it from ubiquitinating substrates and promoting breast cancer metastasis.
What is the function of UBR5 in nuclear hormone receptor stability?
UBR5 forms ligand-dependent complexes on chromatin that regulate nuclear hormone receptor stability, impacting breast cancer.
How can CRISPR be used to study negative regulation of E3 ligases?
CRISPR knockout, point mutation, knock-in, and overexpression models allow precise manipulation of E3 ligases and their regulators to dissect mechanisms.
What methods are used to study E3 ligase negative regulation?
Proteomics, phosphoproteomics, CRISPR screens, live-cell imaging, and in vitro ubiquitination assays.
Why is negative regulation of ubiquitin protein ligase activity important?
It prevents inappropriate protein degradation, maintains immune homeostasis, and controls cell cycle progression, and its dysregulation leads to disease.
Conclusion
GO:1904667 negative regulation of ubiquitin protein ligase activity is a critical biological process that ensures proper control of protein ubiquitination. Through diverse mechanisms such as phosphorylation, sequestration, and inhibitory binding, cells fine-tune E3 ligase activity to maintain homeostasis. Dysregulation of this process contributes to cancer, immune disorders, and developmental defects. Leveraging CRISPR-based models and advanced omics, researchers can uncover new regulatory nodes and therapeutic targets. EDITGENE stands ready to support these efforts with tailored gene editing services.
References
- 1. Cheng MC et al.. 2021. Phytochrome Signaling Networks.. Annu Rev Plant Biol 72:217-244 PMID: 33756095
- 2. Tsai JM et al.. 2023. UBR5 forms ligand-dependent complexes on chromatin to regulate nuclear hormone receptor stability.. Mol Cell 83(15):2753-2767.e10 PMID: 37478846
- 3. Mondal G et al.. 2025. Autophagy-targeted NBR1-p62/SQSTM1 complexes promote breast cancer metastasis by sequestering ITCH.. Nat Cell Biol 27(7):1098-1113 PMID: 40579454
- 4. Qu X et al.. 2004. Negative regulation of FcepsilonRI-mediated mast cell activation by a ubiquitin-protein ligase Cbl-b.. Blood 103(5):1779-86 PMID: 14604964
- 5. Wan JX et al.. 2023. Research Progress in Function and Regulation of E3 Ubiquitin Ligase SMURF1.. Curr Med Sci 43(5):855-868 PMID: 37558865
- 6. Lin B et al.. 2017. Negative regulation of the RLH signaling by the E3 ubiquitin ligase RNF114.. Cytokine 99:186-193 PMID: 28625874
- 7. Kassenbrock CK et al.. 2004. Regulation of ubiquitin protein ligase activity in c-Cbl by phosphorylation-induced conformational change and constitutive activation by tyrosine to glutamate point mutations.. J Biol Chem 279(27):28017-27 PMID: 15117950
- 8. Yokosawa T et al.. 2024. The E3 Ubiquitin Protein Ligase LINCR Amplifies the TLR-Mediated Signals through Direct Degradation of MKP1.. Cells 13(8) PMID: 38667302
