GO:0071569 protein ufmylation: Ubiquitin-like Modification, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0071569 protein ufmylation is the covalent attachment of the ubiquitin-like protein UFM1 to target proteins, a reversible post-translational modification.
• The UFM1 conjugation machinery includes UBA5 (E1), UFC1 (E2), UFL1 (E3), and UFSP2 as the main deufmylase.
• Ufmylation regulates diverse cellular processes including ribosome function, ER homeostasis, autophagy, DNA damage response, and immune signaling [1,2,4,8].
• Dysregulated ufmylation is implicated in cancer, cardiomyopathy, and immune evasion, with key substrates such as p53, PD-1, BECN1, and MAVS [3,4,5,7].
• CRISPR-based models (knockout, point mutation, knock-in, overexpression) are essential to dissect causal roles of ufmylation components and substrates [5,6].
• Targeted UFMylation research benefits from combining proteomics, imaging, and functional screens to identify new substrates and therapeutic targets [1,2].
Description
Protein ufmylation (GO:0071569) is a ubiquitin-like post-translational modification in which the small protein UFM1 is covalently attached to lysine residues of target proteins. Since its discovery, ufmylation has emerged as a critical regulator of cellular stress responses, protein quality control, and development. Unlike ubiquitination, ufmylation uses a dedicated enzymatic cascade and is reversed by specific proteases, allowing dynamic control of substrate function. Researchers study ufmylation to understand how cells maintain proteostasis and to identify therapeutic targets in cancer, cardiovascular disease, and immune disorders [1,3,6]. The modification is highly conserved and essential for embryonic development, underscoring its biological importance. This article provides a comprehensive overview of the molecular machinery, key substrates, disease links, and research methods for studying protein ufmylation.
protein ufmylation At A Glance
| GO ID | GO:0071569 |
|---|---|
| GO term | protein ufmylation |
| Ontology | biological_process |
| Synonym | None |
| Definition | Covalent attachment of the ubiquitin-like protein UFM1 to another protein. |
| Major function | Post-translational modification regulating protein stability, localization, and interactions. |
| Key enzymes | UBA5 (E1), UFC1 (E2), UFL1 (E3), UFSP2 (deufmylase) |
| Substrates | p53, PD-1, BECN1, MAVS, CYB5R3, and others |
| Associated diseases | Cancer, cardiomyopathy, immune evasion, ER stress-related disorders |
What Is GO:0071569?
According to the Gene Ontology, GO:0071569 protein ufmylation is defined as the covalent attachment of the ubiquitin-like protein UFM1 to another protein. This process involves an enzymatic cascade that activates UFM1, transfers it to a target lysine, and can be reversed by deufmylating enzymes. Ufmylation is a reversible post-translational modification that alters the stability, localization, or interactions of substrate proteins.
Why Is protein ufmylation Important in Cell Biology?
Protein ufmylation is important because it governs fundamental cellular processes such as ribosome biogenesis, endoplasmic reticulum (ER) homeostasis, autophagy, and DNA damage repair [1,2,4,8]. Dysregulation of ufmylation has been linked to cancer progression, peripartum cardiomyopathy, and viral immune evasion, making it a promising target for therapeutic intervention [3,5,6,7]. Understanding ufmylation at the molecular level can reveal new biomarkers and drug targets for a range of human diseases.
• Regulates ribosome function and ribosomal DNA damage response.
• Controls ER-phagy and ER homeostasis through CYB5R3 ufmylation.
• Modulates autophagy initiation by stabilizing BECN1.
• Maintains tumor suppressor p53 stability by antagonizing ubiquitination.
• Suppresses unfolded protein response to prevent peripartum cardiomyopathy.
• Regulates T cell anti-tumor immunity via PD-1 ufmylation.
• Facilitates viral immune evasion by targeting MAVS for ufmylation.
• Essential for embryonic development and cellular stress responses.
• Provides a reversible modification system for dynamic protein regulation.
• Offers potential therapeutic targets in oncology and cardiovascular disease [1,6].
What Happens During protein ufmylation?
Activation of UFM1 by the E1 enzyme UBA5
In simple terms: UFM1 is first turned on by an enzyme called UBA5.
The ufmylation cascade begins with the ATP-dependent activation of UFM1 by the E1 enzyme UBA5, which forms a thioester bond with UFM1. This step is essential for subsequent transfer to the E2 enzyme UFC1.
Transfer to the E2 enzyme UFC1
In simple terms: UFM1 is passed to a carrier protein called UFC1.
Activated UFM1 is transferred from UBA5 to the E2 conjugating enzyme UFC1 via a trans-thioesterification reaction. UFC1 serves as the central carrier that delivers UFM1 to the E3 ligase UFL1.
Substrate recognition and ligation by UFL1
In simple terms: UFL1 helps attach UFM1 to the target protein.
The E3 ligase UFL1, often in complex with DDRGK1, recognizes specific substrate proteins and catalyzes the covalent attachment of UFM1 to lysine residues. This step determines substrate specificity and is regulated by accessory factors.
Deufmylation by UFSP2
In simple terms: UFSP2 removes UFM1 from proteins, making the process reversible.
The protease UFSP2 cleaves UFM1 from modified proteins, reversing the modification and allowing dynamic regulation. This deufmylation is crucial for recycling UFM1 and maintaining cellular homeostasis.
Functional consequences on substrate proteins
In simple terms: Adding UFM1 changes how the target protein works.
Ufmylation can alter protein stability, localization, interactions, and activity, impacting processes such as autophagy, DNA damage response, and immune signaling [1,2,4,5,7,8]. For example, ufmylation of p53 antagonizes its ubiquitination and maintains its stability.
Key Genes Involved in GO:0071569 protein ufmylation
The following genes and proteins are core components or well-characterized substrates of the protein ufmylation pathway.
| Gene | Major Role | Research Relevance |
|---|---|---|
| UFM1 | Ubiquitin-like modifier | Central player; knockout leads to embryonic lethality |
| UBA5 | E1 activating enzyme | Initiates ufmylation; mutations linked to neurodevelopmental disorders |
| UFC1 | E2 conjugating enzyme | Carries UFM1 to E3; essential for cascade |
| UFL1 | E3 ligase | Determines substrate specificity; knockout affects T cell immunity |
| DDRGK1 | Accessory factor for UFL1 | Stabilizes UFL1 and enhances ufmylation |
| UFSP2 | Deufmylase | Reverses ufmylation; regulates UFM1 recycling |
| TP53 | Tumor suppressor | Ufmylation stabilizes p53 by antagonizing ubiquitination |
| PDCD1 (PD-1) | Immune checkpoint | Ufmylation regulates PD-1 stability and anti-tumor immunity |
| BECN1 | Autophagy initiator | UFMylation stabilizes BECN1 to promote autophagy |
| MAVS | Mitochondrial antiviral signaling | UFMylation by EBV protein evades NLRP3 inflammasome |
| CYB5R3 | ER membrane protein | Ufmylation regulates ER-phagy |
| VCP/p97 | AAA+ ATPase | UFMylation stabilizes BECN1 via VCP/p97 |
| RPL26 | Ribosomal protein | Ufmylation affects ribosome function and DNA damage response |
| NLRP3 | Inflammasome sensor | Indirectly affected by MAVS ufmylation |
| ATG proteins | Autophagy machinery | Ufmylation influences autophagy initiation |
| ER stress sensors | UPR pathway | Ufmylation suppresses unfolded protein response |
How Is protein ufmylation Regulated?
Protein ufmylation is regulated at multiple levels. The enzymatic activity of UFL1 can be modulated by its partner DDRGK1, and the deufmylase UFSP2 controls the steady-state levels of ufmylated proteins. Cellular stresses such as ER stress, DNA damage, and viral infection can alter ufmylation patterns [2,3,6]. For instance, UFL1 ablation in T cells suppresses PD-1 ufmylation, enhancing anti-tumor immunity. Additionally, ufmylation of CYB5R3 regulates ER-phagy in response to nutrient status. These regulatory mechanisms ensure dynamic control of ufmylation under physiological and pathological conditions.
protein ufmylation and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| UFL1 | Cancer immunotherapy | UFL1 knockout T cells in mouse tumor models |
| UFM1 | Embryonic development | Conditional knockout mice |
| TP53 | Cancer | Ufmylation-deficient cancer cell lines |
| MAVS | Viral immune evasion | EBV-infected cells with MAVS ufmylation mutants |
| CYB5R3 | ER-phagy and metabolic stress | CYB5R3 ufmylation-deficient cells |
Cancer
Ufmylation plays context-dependent roles in cancer. UFL1 ablation in T cells suppresses PD-1 ufmylation, leading to enhanced anti-tumor immunity. Ufmylation of p53 maintains its stability and tumor suppressor function, suggesting that loss of ufmylation could promote tumorigenesis. Targeting ufmylation components may offer new strategies for cancer immunotherapy.
Cardiovascular disease
Ufmylation suppresses the unfolded protein response to prevent peripartum cardiomyopathy. Dysregulated ufmylation in cardiomyocytes can lead to ER stress and cardiac dysfunction, highlighting its protective role in heart disease.
Immune evasion and viral infection
Epstein-Barr virus (EBV) proteins can hijack the ufmylation machinery to modify MAVS, thereby evading NLRP3 inflammasome activation. This demonstrates how pathogens exploit ufmylation to subvert host immunity.
Neurodevelopmental disorders
Mutations in UBA5, a key E1 enzyme for ufmylation, have been linked to neurodevelopmental disorders, underscoring the importance of ufmylation in brain development.
From protein ufmylation-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the role of UFL1 in T cell immunity? | UFL1 knockout mice or T cell-specific conditional knockout |
| How does p53 ufmylation affect tumor suppression? | Point mutation of p53 lysine residues targeted by UFM1 |
| Does UFM1 modification of BECN1 regulate autophagy? | Knock-in of tagged UFM1 or BECN1 mutants |
| What is the impact of UBA5 mutations on neuronal development? | Patient-derived iPSCs with UBA5 point mutations |
| How does CYB5R3 ufmylation control ER-phagy? | Overexpression of ufmylation-deficient CYB5R3 |
| Can ufmylation be targeted to enhance anti-tumor immunity? | UFL1 knockout in CAR-T cells |
How to Study the protein ufmylation Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Mass spectrometry | Identification of ufmylated proteins and sites | Discovering novel substrates |
| CRISPR screens | Genetic dependencies and modifiers | Functional genomics of ufmylation [1,5] |
| Western blot with anti-UFM1 | Levels of ufmylated proteins | Validating specific substrates |
| Immunofluorescence | Subcellular localization of ufmylation | Visualizing ER or ribosomal ufmylation [2,8] |
| In vitro ufmylation assay | Enzymatic activity of E1/E2/E3 | Mechanistic studies and inhibitor testing |
| Co-immunoprecipitation | Protein-protein interactions | Identifying UFL1 substrates |
| RNA-seq | Transcriptional changes upon ufmylation perturbation | Pathway analysis |
| Ribo-seq | Translation efficiency changes | Ribosome-related ufmylation functions |
Proteomic identification of ufmylated substrates
Mass spectrometry-based proteomics using UFM1-specific enrichment or tagged UFM1 can identify novel substrates and map ufmylation sites. This approach is powerful for discovering new players in the ufmylation pathway.
Functional genomics with CRISPR screens
CRISPR knockout or activation screens can systematically identify genes that regulate or depend on ufmylation, revealing genetic interactions and pathways [1,2]. Such screens are useful for uncovering modifiers of ufmylation in disease contexts.
Imaging and subcellular localization
Fluorescence microscopy with tagged UFM1 or ufmylation machinery components can visualize dynamic changes in ufmylation at specific organelles such as the ER or ribosomes [2,8]. This helps link ufmylation to cellular structures.
Biochemical assays for ufmylation activity
In vitro reconstitution assays with recombinant UBA5, UFC1, UFL1, and substrates can measure enzymatic activity and identify inhibitors. These assays are essential for mechanistic studies and drug discovery.
How CRISPR Can Be Used to Study GO:0071569 protein ufmylation
Knockout
CRISPR knockout of UFM1, UBA5, UFC1, UFL1, or UFSP2 can abolish or dysregulate ufmylation, revealing essential cellular functions and disease relevance [1,5]. For example, UFL1 knockout in T cells enhances anti-tumor immunity by suppressing PD-1 ufmylation.
Point Mutation
Introducing point mutations in UFM1 or substrate lysine residues using CRISPR base editing or HDR can dissect site-specific ufmylation functions without affecting overall protein levels. This is useful for studying p53 ufmylation sites.
Knock-in
Knock-in of tagged UFM1 (e.g., HA or GFP) allows tracking and affinity purification of ufmylated proteins in endogenous contexts. Similarly, knock-in of disease-associated mutations (e.g., UBA5) can model neurodevelopmental disorders.
Overexpression
CRISPR activation or cDNA overexpression of ufmylation components can amplify the pathway to study gain-of-function effects and identify downstream consequences [6,8]. Overexpression of UFL1 or UFM1 may protect against ER stress or cardiomyopathy.
How EDITGENE Supports protein ufmylation Research
Researchers studying protein ufmylation-related genes often need to determine whether a candidate gene is causally involved in the modification, which substrates are affected, and how these events influence disease phenotypes. EDITGENE provides comprehensive CRISPR-based services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for protein ufmylation research.
Frequently Asked Questions About protein ufmylation
What is protein ufmylation?
Protein ufmylation is a post-translational modification where the ubiquitin-like protein UFM1 is covalently attached to target proteins, regulating their function.
What genes are involved in protein ufmylation?
Key genes include UFM1, UBA5, UFC1, UFL1, DDRGK1, and UFSP2, which form the conjugation and deconjugation machinery.
What is the function of UFL1 in ufmylation?
UFL1 is the E3 ligase that recognizes substrates and catalyzes the attachment of UFM1 to target proteins.
How is ufmylation reversed?
The protease UFSP2 removes UFM1 from modified proteins, making the process reversible.
What diseases are associated with ufmylation?
Ufmylation is linked to cancer, peripartum cardiomyopathy, neurodevelopmental disorders, and viral immune evasion [1,3,5,6,7].
What is the role of ufmylation in cancer?
Ufmylation can stabilize tumor suppressors like p53 and regulate immune checkpoints like PD-1, influencing anti-tumor immunity [5,7].
How can I study ufmylation in the lab?
Common methods include mass spectrometry, CRISPR screens, western blotting, and in vitro enzymatic assays [1,2].
What are the substrates of ufmylation?
Known substrates include p53, PD-1, BECN1, MAVS, CYB5R3, and ribosomal proteins [2,3,4,7,8].
Is ufmylation essential for development?
Yes, knockout of UFM1 or its enzymes leads to embryonic lethality in mice, indicating an essential role.
How does ufmylation regulate autophagy?
Ufmylation stabilizes BECN1, promoting autophagy initiation.
Conclusion
Protein ufmylation (GO:0071569) is a vital ubiquitin-like modification that controls diverse cellular processes and is implicated in major human diseases. Understanding its machinery, substrates, and regulation offers new opportunities for therapeutic intervention. EDITGENE provides advanced CRISPR tools to study ufmylation and accelerate translational research.
References
- 1. Zhou X et al.. 2024. UFMylation: a ubiquitin-like modification.. Trends Biochem Sci 49(1):52-67 PMID: 37945409
- 2. Panichnantakul P et al.. 2024. Protein UFMylation regulates early events during ribosomal DNA-damage response.. Cell Rep 43(9):114738 PMID: 39277864
- 3. Yiu SPT et al.. 2023. An Epstein-Barr virus protein interaction map reveals NLRP3 inflammasome evasion via MAVS UFMylation.. Mol Cell 83(13):2367-2386.e15 PMID: 37311461
- 4. Wang Z et al.. 2024. VCP/p97 UFMylation stabilizes BECN1 and facilitates the initiation of autophagy.. Autophagy 20(9):2041-2054 PMID: 38762759
- 5. He C et al.. 2024. UFL1 ablation in T cells suppresses PD-1 UFMylation to enhance anti-tumor immunity.. Mol Cell 84(6):1120-1138.e8 PMID: 38377992
- 6. Tandra V et al.. 2025. Ufmylation Suppresses Unfolded Protein Response to Prevent Peripartum Cardiomyopathy.. JACC Basic Transl Sci 10(10):101293 PMID: 40742366
- 7. Liu J et al.. 2020. UFMylation maintains tumour suppressor p53 stability by antagonizing its ubiquitination.. Nat Cell Biol 22(9):1056-1063 PMID: 32807901
- 8. Ishimura R et al.. 2022. The UFM1 system regulates ER-phagy through the ufmylation of CYB5R3.. Nat Commun 13(1):7857 PMID: 36543799
