GO:0005853 eukaryotic translation elongation factor 1 complex: Components, Assembly and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0005853 defines the eukaryotic translation elongation factor 1 complex, a multisubunit GTP-binding complex that delivers aminoacyl-tRNAs to the ribosomal A-site.
• In humans, the complex comprises four subunits: eEF1A (alpha), eEF1B beta, eEF1B delta, and eEF1B gamma.
• eEF1A is the catalytic subunit that binds GTP and aminoacyl-tRNA, while the eEF1B subunits act as a nucleotide exchange factor to recycle eEF1A-GDP to eEF1A-GTP.
• Beyond translation, eEF1A has been implicated in diverse cellular processes including viral replication, cytoskeletal regulation, and apoptosis [3,4].
• The complex is a critical host factor for HIV-1 reverse transcription, with eEF1A binding the 5' UTR of viral genomic RNA [6,8].
• Dysregulation of eEF1A and its complex subunits is associated with cancer, atherosclerosis, and neurological disorders [5,7].
Description
The eukaryotic translation elongation factor 1 complex (GO:0005853) is a multisubunit nucleotide exchange complex that binds GTP and aminoacyl-tRNAs, and catalyzes their codon-dependent placement at the A-site of the ribosome. This complex is essential for the elongation phase of protein synthesis in all eukaryotes, ensuring that the ribosome receives the correct aminoacyl-tRNA to match each mRNA codon. In humans, the complex is composed of four subunits: alpha (eEF1A), beta (eEF1B beta), delta (eEF1B delta), and gamma (eEF1B gamma). The alpha subunit, eEF1A, is a GTP-binding protein that delivers aminoacyl-tRNA to the ribosome, while the beta, delta, and gamma subunits form the guanine nucleotide exchange factor (GEF) that recycles eEF1A-GDP to eEF1A-GTP. Researchers study this complex not only for its canonical role in translation but also for its emerging functions in viral infection, cytoskeletal dynamics, and disease pathogenesis [3,4]. For example, eEF1A has been shown to inhibit Siniperca chuatsi rhabdovirus infection through two distinct mechanisms, and the complex subunits are critical cofactors for HIV-1 reverse transcription. Understanding the structure, regulation, and interactome of the eEF1 complex is therefore of broad biomedical importance.
eukaryotic translation elongation factor 1 complex At A Glance
| GO ID | GO:0005853 |
|---|---|
| GO term | eukaryotic translation elongation factor 1 complex |
| Ontology | cellular_component |
| Synonym | (none) |
| Major function | Binds GTP and aminoacyl-tRNAs and catalyzes their codon-dependent placement at the ribosomal A-site |
| Subunit composition (human) | eEF1A (alpha), eEF1B beta, eEF1B delta, eEF1B gamma |
| Nucleotide exchange factor | eEF1B beta, delta, and gamma subunits recycle eEF1A-GDP to eEF1A-GTP |
| Additional roles | Viral replication, cytoskeletal regulation, apoptosis, and signal transduction [3,4] |
What Is GO:0005853?
The eukaryotic translation elongation factor 1 complex (GO:0005853) is a cellular component defined as a multisubunit nucleotide exchange complex that binds GTP and aminoacyl-tRNAs, and catalyzes their codon-dependent placement at the A-site of the ribosome. In humans, the complex is composed of four subunits: alpha, beta, delta, and gamma.
Why Is eukaryotic translation elongation factor 1 complex Important in Cell Biology?
The eukaryotic translation elongation factor 1 complex is central to protein synthesis, as it ensures the accurate and efficient delivery of aminoacyl-tRNAs to the ribosome during elongation. Beyond this canonical role, the complex is a hub for viral hijacking, with eEF1A serving as a critical host factor for HIV-1 reverse transcription and other viral infections [6,8]. Dysregulation of eEF1A and its partner subunits has been linked to cancer progression, atherosclerosis, and neurodegenerative conditions, making the complex a potential therapeutic target [5,7]. Moreover, recent studies have revealed dedicated chaperones such as Chp1 that safeguard eEF1A biogenesis, highlighting the complexity of its regulation. For researchers, the eEF1 complex offers a rich system to study translation fidelity, nucleotide exchange mechanisms, and host-pathogen interactions.
• Essential for the elongation phase of protein synthesis in all eukaryotes.
• Catalyzes the delivery of aminoacyl-tRNA to the ribosomal A-site.
• Acts as a critical host factor for HIV-1 reverse transcription.
• Involved in the inhibition of Siniperca chuatsi rhabdovirus infection.
• Linked to cancer, atherosclerosis, and neurological disorders [5,7].
• Regulated by dedicated chaperones such as Chp1 to ensure proper biogenesis.
• Plays a role in cytoskeletal organization and apoptosis [3,4].
• Target for antiviral and anticancer therapeutic strategies [3,5].
What Happens During eukaryotic translation elongation factor 1 complex?
Aminoacyl-tRNA Delivery to the Ribosome
In simple terms: The complex acts like a delivery truck that brings the correct amino acid building block to the protein assembly line.
The eukaryotic translation elongation factor 1 complex binds aminoacyl-tRNAs and GTP, and delivers them to the A-site of the ribosome in a codon-dependent manner. This step ensures that the growing polypeptide chain is elongated with the correct amino acid specified by the mRNA template. eEF1A, the alpha subunit, is responsible for this delivery function, and its activity is tightly coupled to the hydrolysis of GTP.
Nucleotide Exchange and Recycling
In simple terms: After delivering its cargo, the complex must be recharged to work again, like a reusable battery.
Following GTP hydrolysis and release of eEF1A-GDP from the ribosome, the beta, delta, and gamma subunits of the eEF1 complex catalyze the exchange of GDP for GTP, regenerating the active eEF1A-GTP complex. This nucleotide exchange activity is essential for multiple rounds of elongation and is a key regulatory node in translation.
Role in Translation Elongation and Fidelity
In simple terms: The complex helps the ribosome read the genetic instructions accurately and quickly.
By delivering aminoacyl-tRNAs to the A-site, the eEF1 complex contributes to the speed and fidelity of translation elongation. eEF1A also interacts with the ribosome and other translation factors to coordinate the elongation cycle. Recent structural studies have visualized translation and protein biogenesis at the ER membrane, providing insights into how the eEF1 complex operates in a cellular context.
Non-canonical Functions in Viral Infection and Signaling
In simple terms: The complex has other jobs beyond protein synthesis, including helping viruses replicate.
eEF1A and its complex subunits have been implicated in HIV-1 reverse transcription, where they act as critical cofactors. Binding of eEF1A to the 5' UTR of HIV-1 genomic RNA is important for reverse transcription. Additionally, eEF1A has been shown to inhibit Siniperca chuatsi rhabdovirus infection through two distinct mechanisms. These non-canonical roles highlight the multifunctionality of the eEF1 complex.
Key Genes Involved in GO:0005853 eukaryotic translation elongation factor 1 complex
The following genes encode the subunits and regulators of the eukaryotic translation elongation factor 1 complex, as well as associated factors.
| Gene | Major Role | Research Relevance |
|---|---|---|
| EEF1A1 | Alpha subunit; binds GTP and aminoacyl-tRNA, delivers to ribosome | Central to translation elongation; implicated in cancer and viral infection [3,5] |
| EEF1A2 | Alpha subunit paralog; tissue-specific translation | Linked to neurological disorders and cancer |
| EEF1B2 | Beta subunit; guanine nucleotide exchange factor | Regulates eEF1A recycling; potential drug target |
| EEF1D | Delta subunit; guanine nucleotide exchange factor | Modulates translation elongation; involved in stress response |
| EEF1G | Gamma subunit; guanine nucleotide exchange factor | Structural component of the GEF complex |
| CHP1 | Dedicated chaperone for eEF1A biogenesis | Safeguards eEF1A folding and function |
| ARID3A | Transcription factor interacting with eEF1A | Forms complex with eEF1A and PKC-δ in macrophages |
| PKC-δ | Protein kinase C delta; interacts with eEF1A | Involved in glycolytic reprogramming in atherosclerosis |
| HIV-1 RNA | Viral genomic RNA; binds eEF1A | Critical for reverse transcription |
| SCRV | Siniperca chuatsi rhabdovirus; target of eEF1A inhibition | Model for antiviral mechanisms |
| RPL | Ribosomal proteins; interact with eEF1A | Coordinate translation elongation |
| RACK1 | Ribosome-associated protein; interacts with eEF1A | Modulates translation and signaling |
| eEF2 | Elongation factor 2; translocates ribosome | Cooperates with eEF1 complex in elongation |
| GTP | Guanosine triphosphate; energy source | Required for eEF1A function |
| GDP | Guanosine diphosphate; product of GTP hydrolysis | Exchanged by eEF1B subunits |
| Aminoacyl-tRNA | Cargo delivered to ribosome | Substrate for eEF1A |
| mTOR | Kinase regulating translation | Controls eEF1 complex activity via signaling |
How Is eukaryotic translation elongation factor 1 complex Regulated?
The eukaryotic translation elongation factor 1 complex is regulated at multiple levels, including transcription, post-translational modification, and interaction with dedicated chaperones. The mTOR signaling pathway controls translation initiation and elongation, thereby influencing eEF1 complex activity. eEF1A is subject to phosphorylation, methylation, and other modifications that modulate its function. The chaperone Chp1 is essential for eEF1A biogenesis, preventing aggregation and ensuring proper folding. Additionally, the nucleotide exchange activity of the eEF1B subunits is regulated by phosphorylation and other signals.
eukaryotic translation elongation factor 1 complex and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| EEF1A1 | Cancer, atherosclerosis | Knockout or overexpression in cancer cell lines; macrophage models |
| EEF1A2 | Neurological disorders | Knock-in of patient mutations in neurons |
| EEF1B2 | Cancer, translation regulation | Knockout in cancer cell lines |
| EEF1D | Stress response, cancer | Overexpression in stress models |
| CHP1 | eEF1A biogenesis defects | Knockout in cell lines to study chaperone function |
Cancer
eEF1A1 and other subunits of the eEF1 complex are frequently overexpressed in various cancers and are associated with tumor progression, metastasis, and poor prognosis. eEF1A1 promotes cell proliferation and survival, and its inhibition can reduce tumor growth. The complex is also involved in oncogenic signaling pathways, making it a potential target for anticancer therapy.
Atherosclerosis
Disruption of the eEF1A1/ARID3A/PKC-δ complex by neferine inhibits macrophage glycolytic reprogramming in atherosclerosis. This suggests that the eEF1 complex plays a role in metabolic reprogramming of macrophages during atherogenesis, and targeting this complex may offer therapeutic benefits.
Viral Infections
The eEF1 complex is a critical host factor for HIV-1 reverse transcription, with eEF1A binding to the 5' UTR of viral genomic RNA [6,8]. eEF1A also inhibits Siniperca chuatsi rhabdovirus infection through two distinct mechanisms. These findings highlight the complex as a potential target for antiviral strategies [1,6].
Neurological Disorders
Mutations in EEF1A2 have been linked to neurological disorders such as epilepsy and intellectual disability. The eEF1 complex is essential for neuronal protein synthesis, and its dysfunction can lead to neurodegeneration.
From eukaryotic translation elongation factor 1 complex-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the effect of eEF1A1 knockout on translation? | CRISPR knockout in HEK293 or HeLa cells |
| How do point mutations in EEF1A2 affect neuronal function? | Knock-in of patient mutations in iPSC-derived neurons |
| Can eEF1A1 be tagged for live-cell imaging? | Knock-in of fluorescent tag (e.g., GFP) at endogenous locus |
| What is the role of eEF1A1 overexpression in cancer? | Overexpression in cancer cell lines and xenografts |
| How does eEF1A1 interact with HIV-1 RNA? | Knockout or knockdown in HIV-1 infection models [6,8] |
| What is the function of Chp1 in eEF1A biogenesis? | Knockout or knockdown in human cell lines |
How to Study the eukaryotic translation elongation factor 1 complex Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Ribo-seq | Ribosome occupancy and translation efficiency | Global translation profiling upon eEF1 perturbation |
| RNA-seq | Gene expression changes | Transcriptional response to eEF1 knockout |
| Proteomics | Protein abundance and interactions | Identifying eEF1 complex interactors |
| Cryo-EM | High-resolution structure | Visualizing eEF1A on the ribosome |
| Fluorescence microscopy | Subcellular localization | Tracking eEF1A dynamics in live cells |
| Western blot | Protein expression and modification | Validating eEF1 subunit levels |
| Immunoprecipitation | Protein-protein interactions | Isolating eEF1 complexes |
| Polysome profiling | Translation status | Assessing elongation defects |
Ribosome Profiling (Ribo-seq)
Ribo-seq measures ribosome occupancy on mRNAs, providing a snapshot of translation elongation. It can be used to assess the impact of eEF1 complex perturbations on global translation and codon-specific effects.
RNA Sequencing (RNA-seq)
RNA-seq quantifies changes in gene expression upon eEF1 complex manipulation, revealing transcriptional responses and potential feedback mechanisms.
Proteomics and Interactomics
Mass spectrometry-based proteomics can identify proteins interacting with eEF1 subunits and quantify changes in protein abundance. Affinity purification followed by mass spectrometry is useful for mapping the eEF1 interactome.
Imaging and Structural Biology
Fluorescence microscopy and cryo-electron microscopy can visualize the localization and structure of the eEF1 complex at the ribosome and ER membrane. Live-cell imaging of tagged eEF1A allows real-time tracking of its dynamics.
How CRISPR Can Be Used to Study GO:0005853 eukaryotic translation elongation factor 1 complex
Knockout
CRISPR knockout of EEF1A1 or other subunits can abolish complex function, leading to translation arrest and cell death. Conditional knockout models allow tissue-specific studies of eEF1 complex roles in development and disease.
Point Mutation
Introducing point mutations in eEF1A1 or EEF1A2 can mimic disease-associated variants or disrupt specific functions such as GTP binding or tRNA delivery. These models help dissect the molecular mechanisms of eEF1 complex action.
Knock-in
Knock-in of epitope tags (e.g., FLAG, HA) or fluorescent proteins (e.g., GFP) at endogenous loci enables visualization and purification of the eEF1 complex. Knock-in of patient mutations in EEF1A2 can model neurological disorders.
Overexpression
Overexpression of eEF1A1 or other subunits can mimic oncogenic conditions and reveal gain-of-function phenotypes. Inducible overexpression systems allow temporal control of eEF1 complex levels.
How EDITGENE Supports eukaryotic translation elongation factor 1 complex Research
Researchers studying eukaryotic translation elongation factor 1 complex-related genes often need to determine whether a candidate gene is causally involved in translation regulation, viral infection, or disease progression. EDITGENE provides a comprehensive suite of CRISPR-based services to generate precisely engineered cell models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for eukaryotic translation elongation factor 1 complex research.
Frequently Asked Questions About eukaryotic translation elongation factor 1 complex
What is the eukaryotic translation elongation factor 1 complex?
It is a multisubunit complex that binds GTP and aminoacyl-tRNAs and delivers them to the ribosomal A-site during translation elongation.
What genes are involved in the eukaryotic translation elongation factor 1 complex?
The human complex includes EEF1A1, EEF1A2, EEF1B2, EEF1D, and EEF1G, as well as the chaperone CHP1 [3,7].
What is the function of eEF1A?
eEF1A binds GTP and aminoacyl-tRNA and delivers the tRNA to the ribosome, and it also has non-canonical roles in viral infection and cytoskeletal regulation [3,4].
How is the eEF1 complex regulated?
It is regulated by mTOR signaling, post-translational modifications, and dedicated chaperones such as Chp1 [3,7].
What diseases are associated with eEF1 complex dysfunction?
Cancer, atherosclerosis, neurological disorders, and viral infections have been linked to eEF1 complex components [3,5,6].
What is the role of eEF1A in HIV-1 infection?
eEF1A binds the 5' UTR of HIV-1 genomic RNA and is critical for reverse transcription [6,8].
How can I study the eEF1 complex using CRISPR?
CRISPR knockout, point mutation, knock-in, and overexpression models can be used to dissect its functions.
What methods are used to study translation elongation?
Ribo-seq, polysome profiling, RNA-seq, proteomics, and structural biology are commonly used [2,3].
What is the subunit composition of the human eEF1 complex?
It consists of four subunits: alpha (eEF1A), beta (eEF1B beta), delta (eEF1B delta), and gamma (eEF1B gamma).
Why is the eEF1 complex important for cancer research?
eEF1A is often overexpressed in cancers and promotes proliferation and survival, making it a potential therapeutic target.
Conclusion
The eukaryotic translation elongation factor 1 complex (GO:0005853) is a fundamental component of the protein synthesis machinery, with essential roles in translation elongation and emerging functions in viral infection, signaling, and disease. Understanding its structure, regulation, and interactome provides insights into basic biology and offers opportunities for therapeutic intervention. EDITGENE's CRISPR services empower researchers to create precise models to study this complex and its associated genes.
References
- 1. Meng X-Y et al.. 2023. Eukaryotic translation elongation factor 1 alpha (eEF1A) inhibits Siniperca chuatsi rhabdovirus (SCRV) infection through two distinct mechanisms.. J Virol 97(11):e0122623 PMID: 37861337
- 2. Gemmer M et al.. 2023. Visualization of translation and protein biogenesis at the ER membrane.. Nature 614(7946):160-167 PMID: 36697828
- 3. Sasikumar AN et al.. 2012. The many roles of the eukaryotic elongation factor 1 complex.. Wiley Interdiscip Rev RNA 3(4):543-55 PMID: 22555874
- 4. Negrutskii BS et al.. 1998. Eukaryotic translation elongation factor 1 alpha: structure, expression, functions, and possible role in aminoacyl-tRNA channeling.. Prog Nucleic Acid Res Mol Biol 60:47-78 PMID: 9594571
- 5. Xie B et al.. 2025. Disruption of the eEF1A1/ARID3A/PKC-δ Complex by Neferine Inhibits Macrophage Glycolytic Reprogramming in Atherosclerosis.. Adv Sci (Weinh) 12(15):e2416158 PMID: 39973763
- 6. Warren K et al.. 2012. Eukaryotic elongation factor 1 complex subunits are critical HIV-1 reverse transcription cofactors.. Proc Natl Acad Sci U S A 109(24):9587-92 PMID: 22628567
- 7. Minoia M et al.. 2024. Chp1 is a dedicated chaperone at the ribosome that safeguards eEF1A biogenesis.. Nat Commun 15(1):1382 PMID: 38360885
- 8. Li D et al.. 2015. Binding of the eukaryotic translation elongation factor 1A with the 5'UTR of HIV-1 genomic RNA is important for reverse transcription.. Virol J 12:118 PMID: 26242867
