GO:0003746 translation elongation factor activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0003746 translation elongation factor activity describes the molecular function of proteins that drive chain elongation during polypeptide synthesis at the ribosome.
• Elongation factors are essential for adding amino acids to the growing polypeptide chain, and their dysfunction is linked to cancer, mitochondrial disease, and ribosomopathies.
• Key elongation factors include EEF2 (eEF2), EFP (EF-P), TACO1, and eEF3, each with distinct roles in translation elongation.
• Quality-control pathways such as the GCN2/ISR monitor stalled ribosomes and degrade translation factors via E3 ligases to maintain proteostasis.
• CRISPR knockout, point mutation, knock-in, and overexpression models enable precise dissection of elongation factor function in health and disease.
• Ribo-seq, polysome profiling, and proteomics are standard methods to study translation elongation factor activity at genome-wide scale.
Description
Translation elongation factor activity (GO:0003746) is a molecular function that enables the addition of amino acids to the growing polypeptide chain during protein synthesis at the ribosome. This activity is carried out by a diverse family of proteins, including eukaryotic elongation factor 2 (eEF2), elongation factor P (EF-P), and mitochondrial translation factors such as TACO1, which ensure efficient and accurate translation. Elongation factors are not merely passive carriers; they undergo regulated conformational changes and are subject to quality-control pathways that monitor ribosome stalling. Understanding this GO term is critical because dysregulation of elongation factors contributes to cancer progression, mitochondrial disorders, and neurological diseases. Moreover, elongation factors are emerging as therapeutic targets, with eEF2 highlighted as a promising target in cancer. Researchers studying translation elongation factor activity require robust experimental models, including CRISPR-engineered cell lines, to dissect gene function and develop targeted interventions.
translation elongation factor activity At A Glance
| GO ID | GO:0003746 |
|---|---|
| GO term | translation elongation factor activity |
| Ontology | molecular_function |
| Synonym | none |
| Major function | Functions in chain elongation during polypeptide synthesis at the ribosome |
| Related processes | Translation elongation, ribosomal quality control, amino acid response |
| Example proteins | EEF2, EFP, TACO1, eEF3 |
| Disease relevance | Cancer, mitochondrial disease, ribosomopathies |
What Is GO:0003746?
According to the Gene Ontology, GO:0003746 translation elongation factor activity is defined as the function that participates in chain elongation during polypeptide synthesis at the ribosome. In other words, it is the molecular activity of proteins that help the ribosome add amino acids one by one to a growing protein chain, rather than initiating or terminating translation.
Why Is translation elongation factor activity Important in Cell Biology?
Translation elongation factor activity is fundamental to protein synthesis, as it ensures that amino acids are accurately and efficiently added to nascent polypeptides. Defects in elongation factors can lead to ribosome stalling, activation of stress responses, and disease. For example, eEF2 is overexpressed in various cancers and represents a therapeutic target, while mutations in mitochondrial elongation factors cause severe mitochondrial disorders. Thus, studying this activity is essential for understanding basic biology and developing new treatments.
• Elongation factors are required for the elongation step of translation, a core process in all living cells.
• Dysregulation of eEF2 is implicated in cancer, making it a potential therapeutic target.
• EF-P is critical for resolving ribosome stalling at polyproline stretches in bacteria, and its mechanism is conserved in mitochondria via TACO1.
• The GCN1-GCN2 pathway monitors stalled ribosomes and degrades elongation factors to maintain proteostasis.
• Elongation factor 3 (eEF3) is unique to fungi and is essential for fungal translation, offering antifungal targets.
• Mutations in mitochondrial elongation factors cause severe diseases such as Leigh syndrome.
• Elongation factors are regulated by phosphorylation and quality-control pathways.
• CRISPR screens can identify elongation factors essential for cell fitness and drug resistance.
• Ribo-seq and proteomics enable global analysis of elongation factor function.
• Understanding elongation factor activity informs the development of antibiotics and anticancer drugs.
Molecular Mechanism of translation elongation factor activity
Catalytic mechanism of elongation factors
In simple terms: Elongation factors help the ribosome move along the mRNA and add new amino acids to the protein chain.
Elongation factors catalyze the addition of amino acids to the growing polypeptide chain by facilitating codon recognition, peptide bond formation, and translocation. For example, eEF2 promotes translocation by hydrolyzing GTP, while EF-P stimulates peptide bond formation at polyproline stretches. These factors undergo conformational changes that are coupled to GTP hydrolysis or other energy sources.
Role of EF-P and TACO1 in resolving ribosome stalling
In simple terms: Some elongation factors rescue ribosomes that get stuck on difficult sequences.
EF-P is a specialized elongation factor that alleviates ribosome stalling at polyproline motifs by stabilizing the peptidyl-tRNA in the P site. In mitochondria, TACO1 performs a similar function, and its loss leads to mitoribosome stalling and disease. The functional design of unmodified EF-P has been decrypted, revealing that it requires post-translational modification for optimal activity.
Quality control of elongation factors on stalled ribosomes
In simple terms: When ribosomes stall, cells degrade elongation factors to avoid toxicity.
The GCN1-GCN2 pathway senses stalled ribosomes and activates the integrated stress response. An E3 ligase network engages GCN1 to promote the degradation of translation factors on stalled ribosomes, thereby maintaining proteostasis. This quality-control mechanism ensures that damaged or excess elongation factors are removed.
Elongation factor 3 (eEF3) in non-fungal species
In simple terms: A fungal-specific elongation factor has been found in a non-fungal organism, expanding its evolutionary scope.
Elongation factor 3 (eEF3) was traditionally considered fungal-specific, but its activity has been demonstrated in Phytophthora infestans, a non-fungal species. This finding suggests that eEF3-like factors may be more widespread and could be targeted in diverse pathogens.
Key Genes Involved in GO:0003746 translation elongation factor activity
The following genes encode proteins with translation elongation factor activity (GO:0003746) and are key to understanding its function and disease relevance.
| Gene | Major Role | Research Relevance |
|---|---|---|
| EEF2 | Eukaryotic elongation factor 2; promotes ribosomal translocation | Overexpressed in cancer; therapeutic target |
| EFP | Elongation factor P; rescues ribosome stalling at polyproline stretches | Bacterial and mitochondrial translation; antibiotic target |
| TACO1 | Mitochondrial translation factor; alleviates mitoribosome stalling | Mutations cause Leigh syndrome |
| GCN1 | Activates GCN2 on stalled ribosomes; promotes degradation of translation factors | Key regulator of amino acid response |
| GCN2 | EIF2AK4; kinase that phosphorylates eIF2α upon ribosome stalling | Integrated stress response |
| eEF3 | Fungal elongation factor 3; essential for translation | Antifungal target; found in Phytophthora |
| EEF1A1 | Eukaryotic elongation factor 1A; delivers aminoacyl-tRNA to ribosome | Oncogene; involved in cytoskeleton regulation |
| EEF1B2 | Elongation factor 1B; regulates eEF1A activity | Potential cancer biomarker |
| EEF1D | Elongation factor 1D; guanine nucleotide exchange factor | Implicated in translation regulation |
| EEF1G | Elongation factor 1G; delivers aminoacyl-tRNA | Overexpressed in some cancers |
| EEF2K | eEF2 kinase; phosphorylates and inhibits eEF2 | Regulates translation elongation in response to stress |
| RPLP0 | Ribosomal protein lateral stalk; interacts with elongation factors | Component of ribosomal stalk |
| RACK1 | Ribosome-associated protein; regulates translation | Scaffold for signaling pathways |
| DRG1 | Developmentally regulated GTP-binding protein; involved in ribosome assembly | Associated with elongation factor function |
| ZNF598 | E3 ligase; ubiquitinates ribosomal proteins on stalled ribosomes | Quality control of translation |
| ABCE1 | ATP-binding cassette protein; involved in ribosome recycling | Interacts with elongation factors |
How Is translation elongation factor activity Regulated?
Translation elongation factor activity is regulated at multiple levels. The GCN2/ISR pathway monitors ribosome stalling and phosphorylates eIF2α to inhibit global translation while promoting stress-responsive gene expression. E3 ligases, such as those in the GCN1 network, target elongation factors for degradation on stalled ribosomes. Additionally, eEF2 activity is controlled by phosphorylation via eEF2K, which responds to cellular energy status and stress. These regulatory mechanisms ensure that elongation factors are available when needed but are removed when translation is compromised.
translation elongation factor activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| EEF2 | Cancer (multiple types) | CRISPR knockout or point mutation in cancer cell lines |
| TACO1 | Leigh syndrome | Knockout or knock-in of TACO1 mutations in patient-derived fibroblasts |
| EFP | Bacterial infections | CRISPR knockout in bacterial strains |
| GCN1 | Neurodegeneration, amino acid response disorders | Knockout or point mutation in neuronal cell lines |
| eEF3 | Fungal infections | CRISPR knockout in fungal pathogens |
Elongation factors in cancer
eEF2 is overexpressed in many cancers and promotes tumor growth by enhancing translation elongation. Targeting eEF2 or its regulators, such as eEF2K, is a promising therapeutic strategy. Other elongation factors, including eEF1A1, are also implicated in oncogenesis and are being explored as cancer biomarkers.
Mitochondrial translation defects and disease
Mutations in TACO1, a mitochondrial elongation factor, cause Leigh syndrome, a severe neurological disorder characterized by mitoribosome stalling at polyproline stretches. This highlights the importance of elongation factors in mitochondrial function and disease.
Ribosomopathies and translation stress
Defects in translation elongation factors can lead to ribosomopathies, a group of diseases caused by impaired ribosome function. The GCN1-GCN2 quality-control pathway is critical for preventing the accumulation of stalled ribosomes and associated pathologies.
From translation elongation factor activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of EEF2 affect cancer cell proliferation? | EEF2 knockout in cancer cell lines |
| Does a specific TACO1 mutation cause mitoribosome stalling? | TACO1 point mutation knock-in in HEK293T cells |
| How does EF-P modification affect ribosome rescue? | EFP knockout and tagged knock-in in E. coli |
| What is the role of GCN1 in amino acid response? | GCN1 knockout in mammalian cells |
| Can eEF3 be targeted in Phytophthora infestans? | eEF3 knockout in Phytophthora |
| Does overexpression of eEF2K inhibit translation? | EEF2K overexpression in cell lines |
How to Study the translation elongation factor activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Ribo-seq | Ribosome occupancy and elongation rates | Global translation profiling |
| Polysome profiling | Distribution of mRNAs across polysomes | Translation efficiency analysis |
| Proteomics | Protein abundance and modifications | Elongation factor stability |
| CRISPR knockout screens | Gene essentiality and fitness | Identify elongation factors required for growth |
| Western blot | Protein expression and phosphorylation | Validate eEF2 phosphorylation |
| Immunofluorescence | Subcellular localization | Visualize elongation factors in cells |
| GTP hydrolysis assay | Enzymatic activity of elongation factors | Measure eEF2 or EF-P activity |
| Ribosome stalling reporter | Stalling at specific sequences | Assess EF-P or TACO1 function |
Ribosome profiling (Ribo-seq)
Ribo-seq provides a genome-wide snapshot of ribosome positions and density, allowing researchers to measure translation elongation rates and identify stalling sites. This method is particularly useful for studying the impact of elongation factor mutations on translation dynamics.
Polysome profiling
Polysome profiling separates mRNAs by the number of ribosomes bound, revealing changes in translation efficiency upon elongation factor perturbation. It can be combined with RNA-seq to identify specific transcripts affected.
Proteomics and ubiquitin analysis
Mass spectrometry-based proteomics can quantify elongation factor abundance and post-translational modifications, such as ubiquitination, that regulate their stability. This approach helps identify E3 ligases that target elongation factors on stalled ribosomes.
CRISPR screens
Genome-wide CRISPR knockout screens can identify elongation factors essential for cell fitness or drug resistance. These screens are powerful for discovering novel components of the translation elongation machinery.
How CRISPR Can Be Used to Study GO:0003746 translation elongation factor activity
Knockout
CRISPR knockout of elongation factor genes, such as EEF2 or TACO1, allows researchers to study loss-of-function phenotypes, including effects on translation, cell viability, and stress responses. Knockout cell lines are valuable for drug sensitivity screens and for validating therapeutic targets.
Point Mutation
Introducing specific point mutations in elongation factor genes, such as those found in TACO1 patients, can model disease-associated variants and reveal how single amino acid changes affect ribosome stalling and protein function. Point mutation knock-in models are essential for precision medicine approaches.
Knock-in
Knock-in of tagged elongation factors (e.g., GFP or FLAG) enables live-cell imaging and proteomic analysis of protein interactions and localization. This approach is useful for tracking elongation factor dynamics during translation.
Overexpression
Overexpression of elongation factors, such as eEF2 or eEF2K, can mimic oncogenic states and help identify downstream effects on translation and cell growth. Overexpression models are also used to study gain-of-function mutations.
How EDITGENE Supports translation elongation factor activity Research
Researchers studying translation elongation factor activity-related genes often need to determine whether a candidate gene is causally involved in translation regulation, disease progression, or drug response. EDITGENE provides comprehensive CRISPR-based services to generate precisely engineered cell models, enabling functional validation of elongation factors and their regulators.
Contact EDITGENE today to design your custom CRISPR model for translation elongation factor activity research.
Frequently Asked Questions About translation elongation factor activity
What is GO:0003746 translation elongation factor activity?
GO:0003746 is a Gene Ontology molecular function term that describes the activity of proteins that help the ribosome add amino acids to a growing polypeptide chain during translation elongation.
What genes are involved in translation elongation factor activity?
Key genes include EEF2, EFP, TACO1, GCN1, GCN2, and eEF3, among others.
How is translation elongation factor activity regulated?
It is regulated by phosphorylation (e.g., eEF2K), quality-control pathways involving GCN1 and E3 ligases, and the integrated stress response.
What diseases are associated with translation elongation factor dysfunction?
Dysfunction is linked to cancer, Leigh syndrome, ribosomopathies, and neurodegenerative disorders.
What methods are used to study translation elongation factor activity?
Common methods include Ribo-seq, polysome profiling, proteomics, CRISPR screens, and GTP hydrolysis assays.
How can CRISPR be used to study elongation factors?
CRISPR knockout, point mutation knock-in, tagged knock-in, and overexpression models allow functional dissection of elongation factor genes in cells and disease models.
What is the role of EF-P in translation?
EF-P is a specialized elongation factor that rescues ribosomes stalled at polyproline stretches, and its function is conserved in mitochondria via TACO1.
Why is eEF2 a cancer target?
eEF2 is overexpressed in many cancers and promotes tumor growth by enhancing translation elongation, making it a promising therapeutic target.
What is the GCN1-GCN2 pathway?
GCN1 and GCN2 form a quality-control pathway that senses stalled ribosomes and activates the integrated stress response, leading to degradation of translation factors.
Can EDITGENE help create custom CRISPR models for elongation factors?
Yes, EDITGENE provides knockout, point mutation, knock-in, overexpression, and library screening services for elongation factor genes and related pathways.
Conclusion
Translation elongation factor activity (GO:0003746) is a central molecular function in protein synthesis, with critical roles in health and disease. Elongation factors such as eEF2, EF-P, and TACO1 are implicated in cancer, mitochondrial disorders, and ribosomopathies, and they are regulated by sophisticated quality-control pathways. Advances in CRISPR engineering and functional genomics now allow researchers to dissect the precise contributions of these factors to translation and disease. EDITGENE offers a comprehensive suite of CRISPR services to support these investigations, from knockout and point mutation models to library screening and bioinformatics.
References
- 1. Jia X et al.. 2024. Elongation factor 2 in cancer: a promising therapeutic target in protein translation.. Cell Mol Biol Lett 29(1):156 PMID: 39707196
- 2. Hummels KR et al.. 2020. Translation elongation factor P (EF-P).. FEMS Microbiol Rev 44(2):208-218 PMID: 32011712
- 3. Rajkovic A et al.. 2017. Elongation Factor P and the Control of Translation Elongation.. Annu Rev Microbiol 71:117-131 PMID: 28886684
- 4. Tomasiunaite U et al.. 2024. Decrypting the functional design of unmodified translation elongation factor P.. Cell Rep 43(5):114063 PMID: 38635400
- 5. Brischigliaro M et al.. 2024. The human mitochondrial translation factor TACO1 alleviates mitoribosome stalling at polyproline stretches.. Nucleic Acids Res 52(16):9710-9726 PMID: 39036954
- 6. Oltion K et al.. 2023. An E3 ligase network engages GCN1 to promote the degradation of translation factors on stalled ribosomes.. Cell 186(2):346-362.e17 PMID: 36638793
- 7. Zhou C et al.. 2025. GCN1 couples GCN2 to ribosomal state to initiate amino acid response pathway signaling.. Science 390(6768):eads8728 PMID: 41037622
- 8. Mateyak MK et al.. 2018. Demonstration of translation elongation factor 3 activity from a non-fungal species, Phytophthora infestans.. PLoS One 13(1):e0190524 PMID: 29300771
