GO:0019789 SUMO transferase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0019789 SUMO transferase activity is a molecular function that catalyzes the covalent attachment of SUMO to target proteins, forming an isopeptide bond between the SUMO C-terminus and a lysine residue on the substrate.
• SUMO transferase activity is essential for diverse cellular processes including mitochondrial dynamics, metabolism, autophagy, and immune signaling.
• Key enzymes with SUMO transferase activity include the SUMO E2 conjugating enzyme UBE2I (UBC9) and several E3 ligases such as PIAS family proteins, RanBP2, and ZNF451.
• Dysregulation of SUMO transferase activity is implicated in cancer, neurodegeneration, fibrosis, and metabolic disorders.
• CRISPR-based models (knockout, point mutation, knock-in, overexpression) enable precise dissection of SUMO transferase function in health and disease.
• EDITGENE provides comprehensive CRISPR services to study SUMO transferase activity, from library screening to bioinformatics analysis.
Description
SUMO transferase activity (GO:0019789) is a molecular function that mediates the covalent conjugation of Small Ubiquitin-like Modifier (SUMO) proteins to target substrates, a process known as SUMOylation. This post-translational modification regulates protein stability, localization, interactions, and activity, thereby influencing a wide array of cellular pathways. The reaction involves the transfer of SUMO from a SUMO-conjugated donor (X-SUMO) to an acceptor protein (Y), forming a new isopeptide bond (Y-SUMO). Researchers study SUMO transferase activity to understand its roles in mitochondrial dynamics, metabolic regulation, autophagy, and disease pathogenesis. The clinical relevance of SUMOylation is underscored by its involvement in cancer, neurodegeneration, fibrosis, and immune responses. Consequently, tools to manipulate and measure SUMO transferase activity are critical for both basic and translational research.
SUMO transferase activity At A Glance
| GO ID | GO:0019789 |
|---|---|
| GO term | SUMO transferase activity |
| Ontology | molecular_function |
| Synonym | SMT3 conjugating enzyme, SUMO conjugating enzyme activity |
| Definition | Catalysis of the transfer of SUMO from one protein to another via the reaction X-SUMO + Y = Y-SUMO + X, where both X-SUMO and Y-SUMO are covalent linkages. |
| Major function | Covalent attachment of SUMO to target proteins (SUMOylation) |
| Related enzymes | UBE2I (UBC9), PIAS1-4, RanBP2, ZNF451, and other E3 ligases |
| Cellular processes | Mitochondrial dynamics, metabolism, autophagy, immune signaling, DNA repair |
What Is GO:0019789?
SUMO transferase activity is defined as the catalysis of SUMO transfer from one protein to another via the reaction X-SUMO + Y = Y-SUMO + X, where both X-SUMO and Y-SUMO are covalent linkages. In essence, it is the enzymatic activity that attaches SUMO to substrate proteins, typically through an isopeptide bond between the SUMO C-terminal glycine and a lysine residue on the target.
Why Is SUMO transferase activity Important in Cell Biology?
SUMO transferase activity is crucial because it governs a vast array of cellular processes through the reversible modification of thousands of proteins. It impacts mitochondrial function, metabolic homeostasis, autophagy, and immune responses, and its dysregulation is linked to cancer, neurodegeneration, fibrosis, and metabolic diseases. Understanding this activity provides insights into fundamental biology and offers potential therapeutic targets.
• Regulates mitochondrial dynamics and function, including fission and fusion.
• Controls metabolic pathways such as glucose sensing and fatty acid metabolism.
• Modulates autophagy at multiple stages, from induction to maturation.
• Influences cancer cell metabolism and tumorigenesis, e.g., in prostate cancer.
• Plays a role in neuroinflammation and neurodegenerative diseases.
• Contributes to renal fibrosis through regulation of LKB1 and fatty acid metabolism.
• Regulates the Integrator complex, affecting RNA processing.
• Is essential for immune cell memory development via AMPK-SENP1-Sirt3 signaling.
• Dysregulation is associated with metabolic disorders and aging.
• Provides a target for therapeutic intervention in multiple diseases.
What Happens During SUMO transferase activity?
Activation and Conjugation Cascade
In simple terms: SUMO is first activated and then transferred to a target protein.
SUMO transferase activity is the final step of a three-enzyme cascade. SUMO is first activated by the E1 enzyme (SAE1/SAE2) in an ATP-dependent manner, then transferred to the E2 conjugating enzyme UBE2I (UBC9). Finally, with the help of E3 ligases, SUMO is covalently attached to a lysine residue on the substrate protein.
Substrate Recognition and Specificity
In simple terms: E3 ligases help choose which proteins get SUMOylated.
E3 ligases such as PIAS proteins, RanBP2, and ZNF451 confer substrate specificity by bringing the E2-SUMO thioester in close proximity to the target protein. They recognize specific motifs, including the consensus SUMOylation motif (ΨKxE) or other non-canonical sequences, ensuring precise modification of substrates involved in diverse pathways.
Regulation by De-SUMOylation
In simple terms: SUMO can be removed by SENP enzymes, making the process reversible.
SUMOylation is dynamically reversed by sentrin-specific proteases (SENPs), which cleave SUMO from substrates. This balance between SUMO transferase and de-SUMOylase activities is critical for cellular homeostasis. For example, SENP1 regulates Sirt3 and mitochondrial metabolism, and its interplay with SUMOylation controls T cell memory development.
Crosstalk with Other Post-Translational Modifications
In simple terms: SUMOylation can affect other modifications like acetylation and phosphorylation.
SUMO transferase activity often crosstalks with other post-translational modifications. For instance, SUMOylation of MFF coordinates fission complexes and promotes stress-induced mitochondrial fragmentation. In prostate cancer, SUMOylation of hexokinase 2 controls its binding to mitochondria, impacting tumorigenesis. Such crosstalk fine-tunes cellular responses.
Key Genes Involved in GO:0019789 SUMO transferase activity
The following genes encode enzymes and substrates directly involved in SUMO transferase activity and its regulation.
| Gene | Major Role | Research Relevance |
|---|---|---|
| UBE2I (UBC9) | E2 conjugating enzyme | Central to SUMO transfer; knockout is lethal |
| SAE1 | E1 activating enzyme subunit | Required for SUMO activation |
| SAE2 (UBA2) | E1 activating enzyme subunit | Required for SUMO activation |
| PIAS1 | E3 ligase | Confers substrate specificity |
| PIAS2 | E3 ligase | Confers substrate specificity |
| PIAS3 | E3 ligase | Confers substrate specificity |
| PIAS4 | E3 ligase | Confers substrate specificity |
| RanBP2 | E3 ligase | SUMOylation of nuclear pore proteins |
| ZNF451 | E3 ligase | SUMOylation of diverse substrates |
| SENP1 | De-SUMOylase | Regulates Sirt3 and mitochondrial metabolism |
| MFF | Substrate | SUMOylation regulates mitochondrial fission |
| HK2 | Substrate | SUMOylation controls mitochondrial binding in prostate cancer |
| IGF1R | Substrate | SUMOylation linked to neuroinflammation |
| LKB1 | Substrate | SUMOylation affects fatty acid metabolism in renal fibrosis |
| β-catenin | Regulator | Inhibits SUMOylation of LKB1 |
| Sirt3 | Substrate/Regulator | Regulated by SENP1-SUMOylation crosstalk |
| AMPK | Regulator | Activates SENP1-Sirt3 signaling |
How Is SUMO transferase activity Regulated?
SUMO transferase activity is regulated at multiple levels. The availability of SUMO, the activity of E1 and E2 enzymes, and the expression of E3 ligases all influence SUMOylation. De-SUMOylases (SENPs) provide reversibility. Signaling pathways such as AMPK can modulate SUMOylation indirectly; for example, glucose limitation activates AMPK coupled SENP1-Sirt3 signaling in mitochondria for T cell memory development. Additionally, β-catenin inhibits SUMOylation of LKB1, affecting fatty acid metabolism in renal fibrosis. Exercise-induced reduction of IGF1R SUMOylation attenuates neuroinflammation, highlighting physiological regulation.
SUMO transferase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| HK2 | Prostate cancer | Knockout or point mutation in prostate cancer cell lines |
| IGF1R | Neuroinflammation in Alzheimer's disease | Knock-in or knockout in APP/PS1 mice |
| LKB1 | Renal fibrosis | Knockout or overexpression in renal fibrosis models |
| MFF | Mitochondrial dynamics | Knockout or tagged knock-in in HeLa cells |
| Sirt3 | Metabolic regulation and T cell memory | Knockout or point mutation in T cells |
SUMO transferase activity in cancer
SUMOylation is often dysregulated in cancer. In prostate cancer, SUMOylation of hexokinase 2 controls its binding to mitochondria and protects against tumorigenesis. The SENP1-Sirt3 signaling axis controls mitochondrial protein acetylation and metabolism, impacting cancer cell metabolism. These findings suggest that targeting SUMO transferase activity could be therapeutically beneficial.
SUMO transferase activity in neurodegeneration
In Alzheimer's disease models, exercise-induced reduction of IGF1R SUMOylation attenuates neuroinflammation in APP/PS1 transgenic mice. This indicates that SUMOylation contributes to neuroinflammatory processes and that modulating SUMO transferase activity may have neuroprotective effects.
SUMO transferase activity in fibrosis
β-catenin-inhibited SUMOylation of LKB1 and fatty acid metabolism is critical in renal fibrosis. This highlights the role of SUMO transferase activity in fibrotic diseases and suggests that manipulating SUMOylation could alter fibrosis progression.
SUMO transferase activity in metabolic disorders
SUMOylation regulates key metabolic enzymes and pathways. For instance, SUMOylation of MFF coordinates fission complexes to promote stress-induced mitochondrial fragmentation, and glucose limitation activates AMPK coupled SENP1-Sirt3 signaling for T cell memory development. Dysregulation may contribute to metabolic disorders.
From SUMO transferase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does UBE2I knockout affect cell viability? | CRISPR knockout in HEK293T or cancer cell lines |
| How does a specific SUMOylation site mutation affect substrate function? | Point mutation (e.g., K-to-R) in substrate gene |
| Can a tagged SUMO be used to track SUMOylation dynamics? | Knock-in of tagged SUMO (e.g., His6-SUMO) |
| What is the effect of overexpressing an E3 ligase? | Overexpression of PIAS or RanBP2 |
| Which genes are essential for SUMO transferase activity? | Genome-wide CRISPR library screening |
| How does SUMOylation of MFF regulate mitochondrial fission? | Knockout or point mutation of MFF in cells |
How to Study the SUMO transferase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Western blot with anti-SUMO | Levels of SUMO conjugates | Detecting global SUMOylation changes |
| In vitro SUMOylation assay | Enzymatic activity | Testing E3 ligase specificity |
| Mass spectrometry | Identification of SUMOylated proteins | Mapping SUMOylome |
| CRISPR knockout screen | Genes required for SUMOylation | Identifying novel regulators |
| Fluorescence microscopy | Subcellular localization of SUMO | Visualizing SUMOylation dynamics |
| Co-immunoprecipitation | Protein-protein interactions | Detecting E2-E3-substrate complexes |
| Site-directed mutagenesis | Effect of specific lysine mutations | Mapping SUMOylation sites |
| RNA-seq | Transcriptional changes upon SUMOylation modulation | Understanding downstream effects |
Proteomic identification of SUMO substrates
Mass spectrometry-based proteomics can identify SUMOylated proteins. Using tagged SUMO (e.g., His6-SUMO) and affinity purification, researchers can enrich SUMO conjugates and identify substrates by LC-MS/MS.
In vitro SUMOylation assays
Recombinant E1, E2, and E3 enzymes with SUMO and substrate can reconstitute SUMO transferase activity in vitro. This allows kinetic analysis and testing of inhibitors or mutations.
CRISPR screening for regulators of SUMOylation
Genome-wide CRISPR knockout or activation screens can identify genes that modulate SUMO transferase activity. For example, a reporter of SUMOylation can be used to sort cells and identify regulators.
Imaging SUMOylation dynamics
Fluorescently tagged SUMO or substrates can be used to visualize SUMOylation in live cells. This reveals spatial and temporal dynamics, such as mitochondrial SUMOylation.
How CRISPR Can Be Used to Study GO:0019789 SUMO transferase activity
Knockout
CRISPR knockout of SUMO transferase genes (e.g., UBE2I, PIAS) can reveal their essential roles. However, complete knockout of UBE2I is lethal, so conditional or inducible systems are often used.
Point Mutation
Point mutations can be introduced into SUMO or substrate genes to abrogate specific SUMOylation sites (e.g., K-to-R). This helps dissect the functional consequences of individual SUMOylation events.
Knock-in
Knock-in of tagged SUMO (e.g., His6-SUMO or GFP-SUMO) allows for affinity purification or imaging of SUMO conjugates. This enables tracking of SUMOylation dynamics in live cells.
Overexpression
Overexpression of E3 ligases or SUMO itself can enhance SUMOylation, useful for studying gain-of-function effects. For example, overexpressing PIAS proteins can increase SUMOylation of specific substrates.
How EDITGENE Supports SUMO transferase activity Research
Researchers studying SUMO transferase activity-related genes often need to determine whether a candidate gene is causally involved in a specific cellular process or disease. EDITGENE provides a comprehensive suite of CRISPR services to enable precise genetic manipulation and functional interrogation of SUMOylation pathways.
Contact EDITGENE today to design your custom CRISPR model for SUMO transferase activity research.
Frequently Asked Questions About SUMO transferase activity
What is SUMO transferase activity?
SUMO transferase activity (GO:0019789) is the enzymatic function that covalently attaches SUMO proteins to target proteins, typically via an isopeptide bond between the SUMO C-terminus and a lysine residue on the substrate.
What genes are involved in SUMO transferase activity?
Key genes include UBE2I (UBC9), SAE1, SAE2, PIAS1-4, RanBP2, ZNF451, and SENP1.
How is SUMO transferase activity regulated?
It is regulated by the availability of SUMO, E1/E2/E3 enzyme expression, de-SUMOylases (SENPs), and signaling pathways such as AMPK.
What diseases are associated with SUMO transferase activity?
Dysregulation is linked to cancer, neurodegeneration, fibrosis, and metabolic disorders.
What methods are used to study SUMO transferase activity?
Common methods include in vitro SUMOylation assays, mass spectrometry, Western blot, CRISPR screens, and fluorescence microscopy.
Can CRISPR be used to study SUMO transferase activity?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models enable precise manipulation of SUMO pathway genes.
What is the role of UBE2I in SUMO transferase activity?
UBE2I (UBC9) is the sole E2 conjugating enzyme for SUMO, essential for transferring SUMO from E1 to substrates.
How does SUMOylation affect mitochondrial function?
SUMOylation of MFF coordinates fission complexes to promote stress-induced mitochondrial fragmentation.
Is SUMO transferase activity involved in cancer?
Yes, SUMOylation of hexokinase 2 controls mitochondrial binding and protects against prostate cancer tumorigenesis.
What is the difference between SUMO transferase and ubiquitin ligase?
SUMO transferase specifically conjugates SUMO, while ubiquitin ligases conjugate ubiquitin; they share similar enzymatic cascades but distinct substrates and functions.
Conclusion
SUMO transferase activity (GO:0019789) is a fundamental molecular function that regulates a myriad of cellular processes through covalent SUMOylation of target proteins. Its involvement in mitochondrial dynamics, metabolism, autophagy, and disease makes it a critical area of research. Understanding the mechanisms, key genes, and regulatory networks of SUMO transferase activity can provide insights into disease pathogenesis and potential therapeutic strategies. EDITGENE offers comprehensive CRISPR services to facilitate precise genetic studies of SUMOylation pathways.
References
- 1. Wang T et al.. 2019. SENP1-Sirt3 Signaling Controls Mitochondrial Protein Acetylation and Metabolism.. Mol Cell 75(4):823-834.e5 PMID: 31302001
- 2. Seager R et al.. 2024. SUMOylation of MFF coordinates fission complexes to promote stress-induced mitochondrial fragmentation.. Sci Adv 10(40):eadq6223 PMID: 39365854
- 3. He J et al.. 2021. Glucose limitation activates AMPK coupled SENP1-Sirt3 signalling in mitochondria for T cell memory development.. Nat Commun 12(1):4371 PMID: 34272364
- 4. Zhou J et al.. 2022. Full-coverage regulations of autophagy by ROS: from induction to maturation.. Autophagy 18(6):1240-1255 PMID: 34662529
- 5. Shangguan X et al.. 2021. SUMOylation controls the binding of hexokinase 2 to mitochondria and protects against prostate cancer tumorigenesis.. Nat Commun 12(1):1812 PMID: 33753739
- 6. Chen Y et al.. 2025. Exercise-Induced Reduction of IGF1R Sumoylation Attenuates Neuroinflammation in APP/PS1 Transgenic Mice.. J Adv Res 69:279-297 PMID: 38565402
- 7. Chen S et al.. 2024. β-catenin-inhibited Sumoylation modification of LKB1 and fatty acid metabolism is critical in renal fibrosis.. Cell Death Dis 15(10):769 PMID: 39438470
- 8. Bragado L et al.. 2022. SUMO conjugation regulates the activity of the Integrator complex.. Nucleic Acids Res 50(21):12444-12461 PMID: 36454007
