{"gene":"EEF2","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":1988,"finding":"Phosphorylation of EF-2 by the Ca2+/calmodulin-dependent EF-2 kinase completely inactivates it in poly(U)-directed translation; phosphorylated EF-2 inhibits non-phosphorylated EF-2, and dephosphorylation by phosphatase restores activity, establishing phosphorylation as a direct mechanism of translational elongation control.","method":"In vitro translation assay (poly(U)-directed polyphenylalanine synthesis), phosphatase treatment/reactivation","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstituted assay with phosphatase reversal; foundational result replicated across multiple subsequent studies","pmids":["3386756"],"is_preprint":false},{"year":1989,"finding":"Phosphorylated eEF2 is unable to promote the shift of aminoacyl(peptidyl)-tRNA from the A site to the P site (translocation), establishing that phosphorylation specifically blocks the translocation step of elongation.","method":"Puromycin reactivity assay measuring A-to-P site tRNA translocation in cell-free system","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in vitro mechanistic assay defining the specific step blocked; consistent with and extending the 1988 Nature finding","pmids":["2753158"],"is_preprint":false},{"year":2004,"finding":"Cryo-EM structure of the yeast 80S·eEF2·sordarin complex at 11.7 Å revealed large conformational changes in eEF2 and the ribosome, including ratchet-like subunit rearrangement (RSR); sordarin positions domain III of eEF2 to interact with the sarcin-ricin loop of 25S rRNA and rpS23, stalling eEF2 in a GTPase activation-like state and suggesting the RSR is part of the tRNA translocation mechanism.","method":"Cryo-EM single-particle reconstruction; molecular interpretation of domain movements","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — near-atomic cryo-EM structure with molecular interpretation; replicated and extended by subsequent structural studies","pmids":["14976550"],"is_preprint":false},{"year":2005,"finding":"Crystal structures of a catalytically active complex between Pseudomonas exotoxin A (ETA) and eEF2 revealed that the diphthamide residue (modified His) of eEF2 spans a cleft and faces the two phosphates and a ribose of the NAD+ analogue, indicating diphthamide triggers NAD+ cleavage and interacts with the oxacarbenium intermediate; the toxin-bound phosphates mimic nucleotides in a 18S rRNA conformational switch, explaining ribosome mimicry for universal eEF2 recognition.","method":"X-ray crystallography (four structures of ETA–eEF2 complex with non-hydrolysable NAD+ analogue betaTAD)","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — four independent crystal structures with mechanistic interpretation; published in Nature","pmids":["16107839"],"is_preprint":false},{"year":2007,"finding":"Cryo-EM reconstructions of eukaryotic ribosomes complexed with ADP-ribosylated eEF2 (ADPR-eEF2) before and after GTP hydrolysis showed that GTP hydrolysis induces conformational changes in eEF2 sufficient to uncouple the mRNA-tRNA complex from two conserved bases in the ribosomal decoding center (A1492/A1493), supporting a two-step translocation model in which eEF2 binding induces ratcheting and GTP hydrolysis drives tRNA-mRNA displacement.","method":"Cryo-EM reconstruction using ADP-ribosylated eEF2 as structural marker; comparison of pre- and post-GTP hydrolysis states","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — structural study with defined chemical states (pre/post GTP hydrolysis); uses ADP-ribosyl group as unambiguous fiducial marker","pmids":["17446867"],"is_preprint":false},{"year":1987,"finding":"A single G-to-A transition at codon 717 (changing the residue adjacent to the diphthamide-modified His715) confers resistance to diphtheria toxin and Pseudomonas exotoxin A ADP-ribosylation; transfection of this cDNA into mouse L cells confirmed the mutation is sufficient for toxin resistance, establishing diphthamide as the essential ADP-ribosylation target on eEF2.","method":"cDNA cloning of toxin-resistant mutant; transfection into mouse L cells; cell-free ADP-ribosylation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — site-specific mutagenesis via natural variant confirmed by transfection and functional assay; replicated by multiple toxin-biology studies","pmids":["2887567"],"is_preprint":false},{"year":2001,"finding":"SAPK4/p38δ phosphorylates eEF2 kinase (eEF2K) at Ser359 in vitro, causing eEF2K inactivation and consequent eEF2 dephosphorylation (activation); this phosphorylation is also induced in cells by anisomycin and IGF-1 and is blocked by a dominant-negative SAPK4/p38δ mutant, placing SAPK4/p38δ as an upstream inhibitor of eEF2K in the stress and growth-factor signaling pathway.","method":"In vitro kinase assay; substrate purification from skeletal muscle extract; cell-based phosphorylation with dominant-negative kinase overexpression","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro kinase assay identifying phosphorylation site plus cell-based epistasis with dominant-negative mutant; replicated in multiple signaling contexts","pmids":["11500363"],"is_preprint":false},{"year":2008,"finding":"Cdc2 (CDK1)-cyclin B phosphorylates eEF2K at Ser359 in vitro and in vivo; cdc2 activity against Ser359 peaks in mitosis coinciding with low eEF2 phosphorylation, indicating that CDK1-mediated inactivation of eEF2K keeps eEF2 active during mitosis to permit protein synthesis; amino-acid starvation decreases cdc2 activity against eEF2K while TSC2 loss (mTORC1 activation) increases it.","method":"Biochemical purification + tryptic mass fingerprinting; in vitro CDK1-cyclin B kinase assay; cell-cycle-stage-specific phosphorylation analysis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — kinase identified by purification and mass spectrometry, validated by in vitro assay, and placed in cell-cycle and nutrient-sensing context","pmids":["18337751"],"is_preprint":false},{"year":2012,"finding":"Cyclin A-CDK2 phosphorylates eEF2 at Ser595 in vitro and in vivo; S595 phosphorylation varies during the cell cycle, is required for efficient T56 phosphorylation by eEF2K in vivo, and directly stimulates eEF2 T56 phosphorylation by eEF2K in vitro, suggesting S595 recruits eEF2K to eEF2 — the first known eEF2 modification that regulates its own inhibition by eEF2K.","method":"In vitro CDK2-cyclin A kinase assay on eEF2; cell-cycle phosphorylation analysis; site-directed mutagenesis (S595A)","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of kinase reaction plus mutagenesis plus in-vivo cell-cycle validation; multiple orthogonal methods in one study","pmids":["23184662"],"is_preprint":false},{"year":2011,"finding":"CPEB2 interacts with eEF2 to reduce eEF2/ribosome-triggered GTP hydrolysis in vitro and slows peptide elongation of CPEB2-bound RNA in vivo; under normoxia CPEB2-eEF2 interaction represses HIF-1α mRNA translation at the elongation step, and oxidative stress causes CPEB2 dissociation from HIF-1α mRNA, enabling rapid HIF-1α synthesis.","method":"Co-immunoprecipitation of CPEB2-eEF2; in vitro GTP hydrolysis assay; ribosome transit-time assay; RNA-binding and stress-response experiments","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro GTP hydrolysis assay plus Co-IP plus functional in-vivo elongation measurement; multiple orthogonal methods","pmids":["22157746"],"is_preprint":false},{"year":2014,"finding":"FAM86A (eEF2-KMT) trimethylates eEF2 at Lys-525; the yeast orthologue Yjr129c (Efm3) methylates the equivalent Lys-509 in yeast eEF2 in vitro and in vivo; loss of this methylation causes increased -1 frameshifting and hypersensitivity to the eEF2-specific drug sordarin, establishing Lys methylation as a functionally important post-translational modification of eEF2.","method":"In vitro methyltransferase assay; yeast genetics (KO phenotype analysis); mass spectrometry to identify methylation site","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro enzyme assay plus in-vivo yeast mutant phenotypes (frameshifting, drug sensitivity); two organisms and multiple methods","pmids":["25231979"],"is_preprint":false},{"year":2014,"finding":"HIV-1 Gag interacts with eEF2 via loops in the amino-terminal capsid domain to block stress granule (SG) assembly; cyclophilin A (CypA) stabilizes the Gag-eEF2 association; eEF2 depletion lifts the SG blockade but also impairs virus production and infectivity, and Gag recruits G3BP1 to disassemble preformed SGs by displacing eEF2.","method":"Co-immunoprecipitation; RNAi knockdown; stress granule assembly/disassembly imaging; viral infectivity assay","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP plus functional knockdown in multiple assays; single lab but orthogonal methods","pmids":["25229650"],"is_preprint":false},{"year":2003,"finding":"p53 forms a salt-stable cytoplasmic complex with eEF2, confirmed by co-immunoprecipitation, anti-eEF2 antiserum recognition, diphtheria toxin ADP-ribosylation, and GTP photolabeling; the p53-eEF2 complex is found in both polyribosomal and subribosomal fractions; nuclear translocation of p53 decreases eEF2 binding; ts-p53 renaturation selectively alters p53 mRNA (not bulk mRNA) sensitivity to the elongation inhibitor cycloheximide.","method":"Co-immunoprecipitation; sucrose gradient sedimentation; ADP-ribosylation by diphtheria toxin; GTP photolabeling; ts-p53 renaturation experiment","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — multiple biochemical methods confirming complex; functional translation experiment linking p53 to elongation; single lab","pmids":["12891704"],"is_preprint":false},{"year":2002,"finding":"Crystals of Saccharomyces cerevisiae eEF2 in complex with GDP were obtained and diffract to 2.85 Å, establishing the first purification and crystallization protocol for eukaryotic eEF2 and enabling subsequent structural studies.","method":"Protein purification from industrial yeast; vapor-diffusion crystallization; X-ray diffraction","journal":"Acta crystallographica. Section D, Biological crystallography","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — structural result (crystal obtained) but paper reports crystallization only, not a solved structure with functional interpretation","pmids":["11914505"],"is_preprint":false},{"year":1991,"finding":"Oxidation of Trp221 in eEF-2 (but not Trp343) by N-bromosuccinimide inactivates its ribosome-dependent GTPase and polyphenylalanine synthesis activities without preventing GTP binding or ribosome·eEF-2·GMPPNP complex formation; oxidized eEF-2 fails to protect ribosomes against ricin inactivation, suggesting Trp221 or its surrounding sequence contacts the GAGA loop of 28S rRNA at the sarcin-ricin site.","method":"Chemical modification (N-bromosuccinimide); GTPase and polyphenylalanine synthesis assays; ricin protection assay; ribosome complex formation assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — chemical mutagenesis with multiple functional readouts defining a specific residue-rRNA interaction; single lab","pmids":["8253723"],"is_preprint":false},{"year":1998,"finding":"The U5 snRNP 116-kDa protein, a homologue of ribosomal elongation factor EF-2, forms a stable RNA-free complex with the U5-200kDa RNA unwindase, U5-220kDa (hPrp8), and U5-40kDa (a novel WD-40 protein) as shown by sedimentation analysis of dissociated U5 snRNP; hPrp8 binds simultaneously to the 40-kDa and 116-kDa proteins, positioning the EF-2 homologue within the spliceosomal architecture.","method":"Sedimentation analysis of chaotrope-dissociated U5 snRNP; cDNA cloning; biochemical co-fractionation","journal":"Molecular and cellular biology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — this involves the EF-2 homologue within U5 snRNP (116kD protein), not canonical eEF2 itself; single sedimentation method; included for completeness as a binding-partner finding","pmids":["9774689"],"is_preprint":false},{"year":1994,"finding":"eEF2 kinase is bound to Hsp90 as demonstrated by co-adsorption with anti-Hsp90 immunoadsorbents from partly purified kinase preparations and crude reticulocyte lysates, establishing Hsp90 as a chaperone partner of the eEF2K-eEF2 regulatory complex.","method":"Immunoadsorption (anti-Hsp90 monoclonal antibody); co-purification from reticulocyte lysate","journal":"FEBS letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single immunoadsorption method; finding pertains directly to eEF2K but contextualizes eEF2 regulation; single lab, single method","pmids":["8050573"],"is_preprint":false},{"year":2001,"finding":"Geldanamycin (GA) disrupts the EF-2 kinase/Hsp90 protein complex as measured by co-immunoprecipitation, leading to decreased eEF2K protein in cell lysates; overexpression of eEF2K abrogates GA-mediated glioma cell killing, demonstrating that destruction of eEF2K downstream of Hsp90 disruption is a cytotoxic mechanism of GA in glioma.","method":"Co-immunoprecipitation; eEF2K overexpression rescue; clonogenic survival assay; xenograft model","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — co-IP plus overexpression rescue plus in vivo model; establishes Hsp90-eEF2K complex and its functional importance for eEF2 regulation","pmids":["11358819"],"is_preprint":false},{"year":2009,"finding":"Post-training dephosphorylation of eEF2 (activation) occurs within 0.5–2 h in hippocampus and amygdala after fear conditioning; blockade of NMDA receptors impedes this dephosphorylation and memory retention; hippocampus-specific overexpression of eEF2K inhibits protein synthesis and impairs late-phase LTP and long-term hippocampus-dependent memory without affecting short-term memory.","method":"Western blot of phospho-eEF2 post-training; NMDA receptor antagonist (MK-801); transgenic overexpression of eEF2K in hippocampus; LTP electrophysiology; behavioral memory tests","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean transgenic loss-of-function with defined synaptic and behavioral phenotypes; NMDA-receptor dependence established pharmacologically; single lab","pmids":["19823585"],"is_preprint":false},{"year":2008,"finding":"Diphthamide modification of eEF2 requires the J-domain protein Dph4; cells from Dph4 mutant mouse embryos lack diphthamide on eEF2 and are resistant to diphtheria toxin killing; Dph4-null mice show growth retardation, embryonic lethality, and preaxial polydactyly identical to Dph1 mutants, establishing that diphthamide is required for normal vertebrate development, likely through translational fidelity of specific proteins.","method":"Mouse genetics (ENU mutant); diphtheria toxin resistance assay; immunolocalization of Dph4; phenotypic analysis of homozygous mutants","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function with biochemical and developmental phenotype readouts; single lab but multiple assays","pmids":["18765564"],"is_preprint":false},{"year":2018,"finding":"eEF2 catalyzes ribosomal reverse translocation (backward by one mRNA triplet) in a reconstituted mammalian translation system; this requires a cognate tRNA in the E-site and cannot occur spontaneously; efficiency increases with eEF2 concentration and non-hydrolyzable GTP analogues; ADP-ribosylation of eEF2 domain IV blocks reverse translocation, establishing domain IV-ribosome interaction as critical for catalysis in both directions.","method":"Reconstituted in vitro mammalian translation system; ADP-ribosylation of eEF2 (diphtheria toxin); non-hydrolyzable GTP analogues; measurement of ribosomal reverse translocation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstituted system with defined biochemical perturbations (ADP-ribosylation, GTP analogues, E-site tRNA requirement); single lab but multiple orthogonal manipulations","pmids":["29453282"],"is_preprint":false},{"year":2014,"finding":"Ribosomal stress activates the eEF2K-eEF2 pathway, inhibiting translation elongation; this leads to translational reprogramming in which TOP mRNAs (encoding ribosomal proteins and translation factors) are paradoxically recruited onto polysomes, increasing their relative translation while global protein synthesis decreases.","method":"Ribosome biogenesis defect models; phospho-eEF2 Western blot; polysome profiling; TOP mRNA-specific translation analysis","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — polysome profiling plus phospho-Western in defined stress model; single lab but multiple readouts","pmids":["25332393"],"is_preprint":false},{"year":2021,"finding":"PQBP1 binds specifically to non-phosphorylated eEF2 and suppresses eEF2K-mediated phosphorylation at Thr56; PQBP1 loss reduces general protein synthesis by suppressing translational elongation and impairs hippocampal mGluR-LTD and associated behaviors.","method":"Co-immunoprecipitation; phospho-eEF2 Western blot; polysome profiling; SUnSET protein synthesis assay; hippocampal LTD electrophysiology; behavioral assays in PQBP1-KO mice","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, genetic KO with defined synaptic and behavioral phenotypes, multiple orthogonal methods in one study","pmids":["33662272"],"is_preprint":false},{"year":2014,"finding":"C-terminal Src kinase (Csk) phosphorylates eEF2 on a tyrosine residue; this phosphorylation does not affect cytoplasmic translation but promotes proteolytic cleavage of eEF2 and SUMOylation-dependent nuclear translocation of the cleaved fragment; nuclear eEF2 fragments induce nuclear morphological changes and aneuploidy.","method":"In vitro kinase assay (Csk on eEF2); co-immunoprecipitation; immunofluorescence nuclear localization; SUMO pathway manipulation; overexpression of eEF2 fragments","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — in vitro kinase assay plus cell-based localization and functional assays; single lab","pmids":["24648518"],"is_preprint":false},{"year":2016,"finding":"During myocardial ischemia-reperfusion, phosphorylated eEF2 is SUMOylated and translocates to the nucleus of cardiomyocytes; eEF2 overexpression upregulates Bcl-2 to reduce apoptosis, while the N-terminal fragment of eEF2 promotes apoptosis, indicating a bidirectional role of eEF2 in cardiomyocyte apoptosis during ischemia-reperfusion.","method":"In vivo rat ischemia-reperfusion model; immunocytochemistry; immunofluorescence; Western blot; flow cytometry apoptosis assay; eEF2 fragment transfection","journal":"Journal of cardiology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, descriptive nuclear translocation without direct mechanistic dissection of SUMOylation writer/reader","pmids":["27401398"],"is_preprint":false},{"year":2010,"finding":"TGFβ activates eEF2 (decreases Thr56 phosphorylation) via an Erk1/2-dependent activation of p90Rsk, which phosphorylates and inactivates eEF2K; dominant-negative p90Rsk reverses TGFβ-induced eEF2 dephosphorylation and eEF2K inhibition, and attenuates TGFβ-induced protein synthesis and mesangial cell hypertrophy.","method":"Kinase inhibitors (Erk1/2); dominant-negative p90Rsk; phospho-Western blot; protein synthesis measurement; cell hypertrophy assay","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dominant-negative epistasis plus inhibitor confirmation; single lab, two orthogonal approaches","pmids":["20837011"],"is_preprint":false},{"year":2018,"finding":"In yeast, loss of diphthamide modification on eEF2 (dphΔ) combined with reduced eEF2 availability (eft2Δ) causes synthetic growth defects, increased -1 ribosomal frameshifting, and hypersensitivity to translation-perturbing drugs (hygromycin, anisomycin), demonstrating that diphthamide on eEF2 is important for translational fidelity of the EF2 translocation function.","method":"Yeast genetic analysis (SGA interactions, double mutants); frameshifting reporter assay; drug sensitivity assays; competitive fitness assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis analysis with multiple functional readouts in defined yeast mutants; single lab","pmids":["30335802"],"is_preprint":false},{"year":2022,"finding":"Genetic reduction of eEF2 in excitatory neurons of the mouse medial prefrontal cortex (mPFC) reduces protein synthesis, lowers dendritic spine density, reduces excitability, and diminishes AMPAR-mediated synaptic transmission, resulting in defective social novelty behavior and elevated anxiety; chemogenetic activation of mPFC excitatory neurons or AMPAR potentiation rescues the social novelty deficit.","method":"Eef2 heterozygous mouse; region-specific viral knockdown; electrophysiology; SUnSET protein synthesis; DREADD chemogenetics; AMPAR potentiator pharmacology; behavioral assays","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean genetic model with region-specific KD and multiple orthogonal rescue strategies; single lab","pmids":["35993189"],"is_preprint":false},{"year":2011,"finding":"eIF5A genetically interacts with eEF2 during translation elongation in yeast: the eIF5A(K56A) hypusine-deficient mutant is synthetically sick with the dominant-negative eEF2(H699K) mutant; high-copy eEF2 suppresses growth, cell-size, protein synthesis, and polysome profile defects of eIF5A(K56A), placing eIF5A and eEF2 in the same elongation pathway.","method":"Yeast genetic epistasis (synthetic sickness, high-copy suppression); polysome profiling; protein synthesis measurement; hygromycin B sensitivity assay","journal":"Amino acids","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with multiple phenotypic readouts; single lab","pmids":["21822730"],"is_preprint":false},{"year":2009,"finding":"In fast-twitch skeletal muscle, inhibition of eEF2K completely blunts the contraction-induced increase in eEF2 phosphorylation and partially (30–40%) blunts the suppression of protein synthesis; the eEF2K activation is downstream of Ca2+/calmodulin but independent of AMPK, as demonstrated by intact protein synthesis suppression in muscles overexpressing kinase-dead AMPK.","method":"Ex vivo muscle contraction; eEF2K inhibitor; kinase-dead AMPK overexpression; protein synthesis (ribosome transit time); Ca2+ manipulation","journal":"The Journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibition plus dominant-negative transgenic model; single lab, two orthogonal approaches","pmids":["19188248"],"is_preprint":false},{"year":2018,"finding":"Stm1 (yeast stress protein) stabilizes eEF2 on the 80S ribosome in the GTP-bound form independently of eEF2's diphthamide modification; Stm1 does not inhibit eEF2 GTPase activity during the first GTP hydrolysis round; the core region of Stm1 (aa 47–143) is required for ribosome binding and eEF2 stabilization.","method":"Reconstituted yeast cell-free translation system; biochemical analysis of eEF2-ribosome binding in presence of Stm1; Stm1 truncation mutant analysis; GTPase assay","journal":"Journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro reconstituted system with defined mutants; single lab","pmids":["29069440"],"is_preprint":false},{"year":2024,"finding":"NAT10-mediated ac4C modification within the coding sequence of HMGB2 mRNA facilitates eEF2 binding to the ac4C sites, enhancing HMGB2 mRNA translation; eEF2 is identified as a reader of ac4C mRNA modifications that promotes translation of ac4C-modified transcripts.","method":"RNA immunoprecipitation (RIP); RNA pulldown; mass spectrometry; ribosome profiling; site-specific ac4C mutation; nascent protein synthesis assay","journal":"Cancer communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA pulldown plus RIP plus ribosome profiling plus site-specific mutation; single lab but multiple orthogonal methods","pmids":["39030964"],"is_preprint":false},{"year":2021,"finding":"Rpl24 (ribosomal protein) mutation suppresses translation elongation through phosphorylation of eEF2 (reducing protein synthesis by ~40% in tumour cells), and genetic inactivation of eEF2K in Rpl24 mutant mice completely restores elongation rates and protein synthesis, as well as abolishing tumour suppression in a colorectal cancer model.","method":"Rpl24 mutant mouse; eEF2K genetic ablation rescue; polysome profiling; SUnSET protein synthesis assay; colorectal cancer mouse model tumorigenesis assay","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis (double mutant complete rescue), quantitative protein synthesis measurement, and in vivo tumor model; multiple orthogonal methods","pmids":["34895463"],"is_preprint":false},{"year":2022,"finding":"LDHA interacts with eEF2 in the cytoplasm in an NADH-dependent manner, sequestering eEF2 away from the ribosome; LDHA knockout or NADH-competitive LDHA inhibitors release eEF2, upregulate translation, and enhance megakaryocyte (MK) maturation and platelet production both in vitro and in vivo.","method":"Co-immunoprecipitation; MK/platelet-specific Ldha knockout mouse; NADH manipulation; LDHA inhibitor treatment; in vitro MK maturation assay; in vivo platelet count","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP establishing interaction, genetic KO with functional rescue, in vivo model; single lab","pmids":["35176139"],"is_preprint":false}],"current_model":"eEF2 is a GTPase that catalyzes GTP-dependent translocation of mRNA-tRNA complexes from the ribosomal A site to the P site (and, in vitro, in reverse); its activity is primarily regulated by phosphorylation at Thr56 by the Ca2+/calmodulin-dependent eEF2 kinase (eEF2K), which completely inhibits translocation, while additional regulatory inputs include CDK1-cyclin B and CDK2-cyclin A phosphorylation of eEF2K (Ser359) or eEF2 itself (Ser595), SAPK4/p38δ-mediated eEF2K Ser359 phosphorylation, p90Rsk-mediated eEF2K inhibition downstream of TGFβ-Erk1/2, AMPK-dependent eEF2K activation under nutrient stress, PP2A-mediated eEF2 dephosphorylation, and trimethylation at Lys525 by FAM86A; eEF2 is also ADP-ribosylated at its unique diphthamide residue (modified His) by bacterial toxins (diphtheria toxin, Pseudomonas exotoxin A, Cholix), which irreversibly blocks translocation, and structurally, cryo-EM and crystal structures of eEF2-ribosome and eEF2-toxin complexes have revealed the conformational rearrangements and domain IV-rRNA contacts that drive tRNA movement and explain toxin recognition."},"narrative":{"mechanistic_narrative":"eEF2 is the translocase GTPase of eukaryotic translation elongation, catalyzing the GTP-dependent shift of the mRNA-tRNA complex from the ribosomal A site to the P site [PMID:2753158]; in reconstituted mammalian systems it also drives reverse translocation, and in both directions catalysis depends on domain IV-ribosome contacts [PMID:29453282]. Structural work has resolved how these movements occur: cryo-EM of the 80S·eEF2 complex revealed large ratchet-like subunit rearrangements coupled to domain III contacts with the sarcin-ricin loop [PMID:14976550], and comparison of pre- and post-GTP-hydrolysis states using ADP-ribosylated eEF2 as a fiducial showed that GTP hydrolysis induces eEF2 conformational changes sufficient to uncouple the mRNA-tRNA complex from the decoding-center bases A1492/A1493, supporting a two-step model of ratcheting followed by hydrolysis-driven displacement [PMID:17446867]. eEF2 activity is gated principally by phosphorylation: the Ca2+/calmodulin-dependent eEF2 kinase phosphorylates eEF2 at Thr56, completely inactivating it and blocking the translocation step, with activity restored by phosphatase dephosphorylation [PMID:3386756, PMID:2753158]. This eEF2K-eEF2 axis integrates diverse upstream signals — CDK1-cyclin B and SAPK4/p38δ phosphorylation that inactivates eEF2K [PMID:11500363, PMID:18337751], CDK2-cyclin A phosphorylation of eEF2 itself at Ser595 that recruits eEF2K to promote Thr56 phosphorylation [PMID:23184662], and TGFβ-Erk1/2-p90Rsk signaling and contraction-induced Ca2+/calmodulin inputs that tune elongation rate during growth and muscle work [PMID:20837011, PMID:19188248]. eEF2 carries a unique diphthamide residue, the essential ADP-ribosylation target of diphtheria toxin and Pseudomonas exotoxin A, and a single substitution adjacent to it confers toxin resistance [PMID:2887567]; structural analysis of the exotoxin A-eEF2 complex shows the diphthamide spans the catalytic cleft to trigger NAD+ cleavage, with toxin recognition mimicking ribosomal nucleotide contacts [PMID:16107839], while diphthamide loss impairs translational fidelity and is required for normal vertebrate development [PMID:18765564, PMID:30335802]. Through phosphorylation-controlled elongation, eEF2 mediates translational reprogramming under ribosomal stress [PMID:25332393, PMID:34895463] and gates protein-synthesis-dependent synaptic plasticity, memory, and behavior in neurons [PMID:19823585, PMID:33662272, PMID:35993189]. eEF2 additionally serves as a regulatory hub bound by trans-acting factors — CPEB2 dampens its ribosomal GTP hydrolysis to repress HIF-1α mRNA elongation [PMID:22157746], PQBP1 binds non-phosphorylated eEF2 to block Thr56 phosphorylation [PMID:33662272], and LDHA sequesters eEF2 from ribosomes in an NADH-dependent manner [PMID:35176139].","teleology":[{"year":1989,"claim":"Established the precise elongation step eEF2 executes and how phosphorylation shuts it off, defining the molecular basis of elongation control.","evidence":"In vitro translation and puromycin-reactivity translocation assays with phosphatase reactivation in cell-free systems","pmids":["3386756","2753158"],"confidence":"High","gaps":["Did not resolve the structural transitions underlying translocation","The full upstream signaling that controls eEF2K was not yet mapped"]},{"year":1987,"claim":"Identified diphthamide as the essential ADP-ribosylation target on eEF2 exploited by bacterial toxins, linking a unique modified residue to toxin sensitivity.","evidence":"cDNA cloning of a toxin-resistant variant and transfection into mouse L cells with cell-free ADP-ribosylation assay","pmids":["2887567"],"confidence":"High","gaps":["The endogenous cellular function of diphthamide was not addressed","Structural basis of toxin recognition not yet known"]},{"year":2005,"claim":"Resolved how toxins recognize and chemically attack the diphthamide, explaining universal eEF2 targeting through ribosome mimicry.","evidence":"Four X-ray crystal structures of the Pseudomonas exotoxin A-eEF2 complex with a non-hydrolysable NAD+ analogue","pmids":["16107839"],"confidence":"High","gaps":["Did not address physiological diphthamide function","Translocation mechanism on the ribosome addressed by separate structures"]},{"year":2007,"claim":"Defined the conformational logic of translocation, showing GTP hydrolysis drives tRNA-mRNA displacement after eEF2 binding induces ribosomal ratcheting.","evidence":"Cryo-EM of 80S·eEF2 (sordarin-stalled) and of ADP-ribosylated eEF2 before/after GTP hydrolysis","pmids":["14976550","17446867"],"confidence":"High","gaps":["Atomic-resolution intermediate states not fully resolved","Coupling of phosphorylation to these conformational steps not structurally shown"]},{"year":2008,"claim":"Mapped the signaling network converging on eEF2K to set elongation rate, connecting cell-cycle and stress kinases to eEF2 phosphorylation.","evidence":"In vitro kinase assays plus cell-based epistasis (dominant-negative, mass-fingerprinting) for SAPK4/p38δ and CDK1-cyclin B on eEF2K Ser359","pmids":["11500363","18337751"],"confidence":"High","gaps":["Quantitative contribution of each kinase in vivo not resolved","Cross-talk among parallel inputs not defined"]},{"year":2012,"claim":"Showed eEF2 itself can be phosphorylated to recruit eEF2K, revealing a feed-forward layer where CDK2 priming promotes inhibitory Thr56 phosphorylation.","evidence":"In vitro CDK2-cyclin A kinase assay on eEF2 Ser595 with S595A mutagenesis and cell-cycle phospho-analysis","pmids":["23184662"],"confidence":"High","gaps":["Structural basis of eEF2K recruitment to phospho-Ser595 not defined","Physiological extent of cell-cycle elongation control not quantified"]},{"year":2010,"claim":"Extended eEF2K regulation to growth-factor and contractile signaling, showing TGFβ-Erk-p90Rsk and Ca2+/calmodulin inputs tune eEF2 activity in tissue contexts.","evidence":"Dominant-negative p90Rsk and kinase inhibitors in mesangial cells; eEF2K inhibition and kinase-dead AMPK in ex vivo muscle","pmids":["20837011","19188248"],"confidence":"Medium","gaps":["AMPK-independent contraction signaling only partially accounts for synthesis suppression","Single-lab tissue models"]},{"year":2011,"claim":"Placed eEF2 within the broader elongation machinery and as a target of trans-acting translational repressors, expanding its role beyond bulk translocation.","evidence":"Yeast genetic epistasis with eIF5A; Co-IP and in vitro GTP hydrolysis/transit-time assays for CPEB2 repression of HIF-1α mRNA","pmids":["21822730","22157746"],"confidence":"Medium","gaps":["Structural mode of CPEB2-eEF2 inhibition unknown","Generality of mRNA-selective elongation repression unclear"]},{"year":2014,"claim":"Defined two post-translational modification layers of eEF2 — Lys525 trimethylation by FAM86A and a Csk tyrosine phosphorylation that triggers nuclear translocation of a cleaved fragment — linking eEF2 modifications to fidelity and to non-translational nuclear effects.","evidence":"In vitro methyltransferase and kinase assays; yeast genetics (frameshifting, sordarin sensitivity); SUMO-dependent localization and fragment overexpression","pmids":["25231979","24648518"],"confidence":"Medium","gaps":["Functional reader/role of Lys525 methylation in mammals not established","Physiological significance of nuclear eEF2 fragments uncertain"]},{"year":2018,"claim":"Demonstrated eEF2 catalyzes reverse translocation requiring domain IV-ribosome contacts, and that diphthamide supports translocation fidelity, unifying the catalytic and modification roles.","evidence":"Reconstituted mammalian translation with ADP-ribosylation and GTP analogues; yeast dphΔ/eft2Δ epistasis with frameshifting and drug-sensitivity readouts","pmids":["29453282","30335802"],"confidence":"Medium","gaps":["Physiological occurrence of reverse translocation unclear","Identity of fidelity-critical transcripts requiring diphthamide unknown"]},{"year":2022,"claim":"Connected eEF2-controlled elongation to synaptic plasticity and behavior, and to translational reprogramming and tumor suppression under ribosomal stress.","evidence":"PQBP1- and Eef2-mutant mice with electrophysiology, SUnSET, polysome profiling, chemogenetic/pharmacological rescue; Rpl24-eEF2K double-mutant colorectal cancer model","pmids":["33662272","35993189","34895463","25332393"],"confidence":"High","gaps":["Transcript selectivity of stress-induced reprogramming not fully defined","Circuit-level mechanism linking elongation rate to behavior incomplete"]},{"year":2024,"claim":"Identified eEF2 as a reader of ac4C-modified mRNA and a target of metabolic sequestration, broadening its regulatory inputs to RNA modification and redox state.","evidence":"RIP/RNA pulldown/ribosome profiling for ac4C reading; Co-IP and Ldha knockout with NADH manipulation for LDHA sequestration","pmids":["39030964","35176139"],"confidence":"Medium","gaps":["Structural basis of eEF2 ac4C recognition unknown","Single-lab findings awaiting independent confirmation"]},{"year":null,"claim":"How the diverse upstream inputs (cell-cycle, growth-factor, stress, metabolic, RNA-modification) are integrated quantitatively to set elongation rate on specific transcripts in vivo remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified quantitative model of competing eEF2 regulatory inputs","Transcript-specific elongation control mechanisms not mapped","Atomic structures coupling phosphorylation state to translocation conformations lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003924","term_label":"GTPase activity","supporting_discovery_ids":[2,4,9,30]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[1,20]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[31]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[2,4,30]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[9,33]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[23,24]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1,20]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[9,31]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[3,5]}],"complexes":["80S ribosome elongation complex"],"partners":["EEF2K","CPEB2","PQBP1","LDHA","CDK2","NAT10"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P13639","full_name":"Elongation factor 2","aliases":[],"length_aa":858,"mass_kda":95.3,"function":"Catalyzes the GTP-dependent ribosomal translocation step during translation elongation (PubMed:26593721). During this step, the ribosome changes from the pre-translocational (PRE) to the post-translocational (POST) state as the newly formed A-site-bound peptidyl-tRNA and P-site-bound deacylated tRNA move to the P and E sites, respectively (PubMed:26593721). Catalyzes the coordinated movement of the two tRNA molecules, the mRNA and conformational changes in the ribosome (PubMed:26593721)","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/P13639/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/EEF2","classification":"Common Essential","n_dependent_lines":1207,"n_total_lines":1208,"dependency_fraction":0.9991721854304636},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"RPL4","stoichiometry":10.0},{"gene":"RACK1","stoichiometry":4.0},{"gene":"RBM8A","stoichiometry":4.0},{"gene":"CAPZB","stoichiometry":0.2},{"gene":"CTCF","stoichiometry":0.2},{"gene":"SEC61B","stoichiometry":0.2},{"gene":"SRP19","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/EEF2","total_profiled":1310},"omim":[{"mim_id":"620684","title":"HGH1 HOMOLOG; HGH1","url":"https://www.omim.org/entry/620684"},{"mim_id":"620062","title":"DEVELOPMENTAL DELAY WITH SHORT STATURE, DYSMORPHIC FACIAL FEATURES, AND SPARSE HAIR 2; DEDSSH2","url":"https://www.omim.org/entry/620062"},{"mim_id":"619034","title":"RNA-BINDING PROTEIN, mRNA-PROCESSING FACTOR, 2; RBPMS2","url":"https://www.omim.org/entry/619034"},{"mim_id":"618391","title":"DIPHTHAMIDE BIOSYNTHESIS PROTEIN 6; DPH6","url":"https://www.omim.org/entry/618391"},{"mim_id":"616901","title":"DEVELOPMENTAL DELAY WITH SHORT STATURE, DYSMORPHIC FACIAL FEATURES, AND SPARSE HAIR 1; DEDSSH1","url":"https://www.omim.org/entry/616901"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/EEF2"},"hgnc":{"alias_symbol":["EEF-2"],"prev_symbol":["EF2"]},"alphafold":{"accession":"P13639","domains":[{"cath_id":"3.40.50.300","chopping":"5-223_345-356","consensus_level":"high","plddt":86.8959,"start":5,"end":356},{"cath_id":"3.90.1430.10","chopping":"259-342","consensus_level":"high","plddt":91.129,"start":259,"end":342},{"cath_id":"2.40.30.10","chopping":"373-485","consensus_level":"high","plddt":92.1354,"start":373,"end":485},{"cath_id":"3.30.70.870","chopping":"504-577","consensus_level":"high","plddt":88.9265,"start":504,"end":577},{"cath_id":"3.30.230.10","chopping":"580-736_847-852","consensus_level":"medium","plddt":94.4828,"start":580,"end":852},{"cath_id":"3.30.70.240","chopping":"739-821","consensus_level":"medium","plddt":87.1501,"start":739,"end":821}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P13639","model_url":"https://alphafold.ebi.ac.uk/files/AF-P13639-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P13639-F1-predicted_aligned_error_v6.png","plddt_mean":89.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=EEF2","jax_strain_url":"https://www.jax.org/strain/search?query=EEF2"},"sequence":{"accession":"P13639","fasta_url":"https://rest.uniprot.org/uniprotkb/P13639.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P13639/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P13639"}},"corpus_meta":[{"pmid":"3386756","id":"PMC_3386756","title":"Phosphorylation of elongation factor 2 by EF-2 kinase affects rate of translation.","date":"1988","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/3386756","citation_count":401,"is_preprint":false},{"pmid":"23706743","id":"PMC_23706743","title":"The eEF2 kinase confers resistance to nutrient deprivation by blocking translation elongation.","date":"2013","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/23706743","citation_count":352,"is_preprint":false},{"pmid":"14976550","id":"PMC_14976550","title":"Domain movements of elongation factor eEF2 and the eukaryotic 80S ribosome facilitate tRNA translocation.","date":"2004","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/14976550","citation_count":322,"is_preprint":false},{"pmid":"16098202","id":"PMC_16098202","title":"Levels of mTOR and its downstream targets 4E-BP1, eEF2, and eEF2 kinase in relationships with tau in Alzheimer's disease brain.","date":"2005","source":"The FEBS journal","url":"https://pubmed.ncbi.nlm.nih.gov/16098202","citation_count":274,"is_preprint":false},{"pmid":"11500363","id":"PMC_11500363","title":"A novel method to identify protein kinase substrates: eEF2 kinase is phosphorylated and inhibited by SAPK4/p38delta.","date":"2001","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/11500363","citation_count":205,"is_preprint":false},{"pmid":"21394738","id":"PMC_21394738","title":"Eukaryotic elongation factor-2 (eEF2): its regulation and peptide chain elongation.","date":"2011","source":"Cell biochemistry and function","url":"https://pubmed.ncbi.nlm.nih.gov/21394738","citation_count":172,"is_preprint":false},{"pmid":"17446867","id":"PMC_17446867","title":"Structures of modified eEF2 80S ribosome complexes reveal the role of GTP hydrolysis in translocation.","date":"2007","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/17446867","citation_count":152,"is_preprint":false},{"pmid":"20427644","id":"PMC_20427644","title":"Synaptic activity controls dendritic spine morphology by modulating eEF2-dependent BDNF synthesis.","date":"2010","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/20427644","citation_count":134,"is_preprint":false},{"pmid":"2753158","id":"PMC_2753158","title":"Mechanism of elongation factor 2 (EF-2) inactivation upon phosphorylation. 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kinase completely inactivates it in poly(U)-directed translation; phosphorylated EF-2 inhibits non-phosphorylated EF-2, and dephosphorylation by phosphatase restores activity, establishing phosphorylation as a direct mechanism of translational elongation control.\",\n      \"method\": \"In vitro translation assay (poly(U)-directed polyphenylalanine synthesis), phosphatase treatment/reactivation\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstituted assay with phosphatase reversal; foundational result replicated across multiple subsequent studies\",\n      \"pmids\": [\"3386756\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"Phosphorylated eEF2 is unable to promote the shift of aminoacyl(peptidyl)-tRNA from the A site to the P site (translocation), establishing that phosphorylation specifically blocks the translocation step of elongation.\",\n      \"method\": \"Puromycin reactivity assay measuring A-to-P site tRNA translocation in cell-free system\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in vitro mechanistic assay defining the specific step blocked; consistent with and extending the 1988 Nature finding\",\n      \"pmids\": [\"2753158\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Cryo-EM structure of the yeast 80S·eEF2·sordarin complex at 11.7 Å revealed large conformational changes in eEF2 and the ribosome, including ratchet-like subunit rearrangement (RSR); sordarin positions domain III of eEF2 to interact with the sarcin-ricin loop of 25S rRNA and rpS23, stalling eEF2 in a GTPase activation-like state and suggesting the RSR is part of the tRNA translocation mechanism.\",\n      \"method\": \"Cryo-EM single-particle reconstruction; molecular interpretation of domain movements\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — near-atomic cryo-EM structure with molecular interpretation; replicated and extended by subsequent structural studies\",\n      \"pmids\": [\"14976550\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Crystal structures of a catalytically active complex between Pseudomonas exotoxin A (ETA) and eEF2 revealed that the diphthamide residue (modified His) of eEF2 spans a cleft and faces the two phosphates and a ribose of the NAD+ analogue, indicating diphthamide triggers NAD+ cleavage and interacts with the oxacarbenium intermediate; the toxin-bound phosphates mimic nucleotides in a 18S rRNA conformational switch, explaining ribosome mimicry for universal eEF2 recognition.\",\n      \"method\": \"X-ray crystallography (four structures of ETA–eEF2 complex with non-hydrolysable NAD+ analogue betaTAD)\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — four independent crystal structures with mechanistic interpretation; published in Nature\",\n      \"pmids\": [\"16107839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Cryo-EM reconstructions of eukaryotic ribosomes complexed with ADP-ribosylated eEF2 (ADPR-eEF2) before and after GTP hydrolysis showed that GTP hydrolysis induces conformational changes in eEF2 sufficient to uncouple the mRNA-tRNA complex from two conserved bases in the ribosomal decoding center (A1492/A1493), supporting a two-step translocation model in which eEF2 binding induces ratcheting and GTP hydrolysis drives tRNA-mRNA displacement.\",\n      \"method\": \"Cryo-EM reconstruction using ADP-ribosylated eEF2 as structural marker; comparison of pre- and post-GTP hydrolysis states\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — structural study with defined chemical states (pre/post GTP hydrolysis); uses ADP-ribosyl group as unambiguous fiducial marker\",\n      \"pmids\": [\"17446867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1987,\n      \"finding\": \"A single G-to-A transition at codon 717 (changing the residue adjacent to the diphthamide-modified His715) confers resistance to diphtheria toxin and Pseudomonas exotoxin A ADP-ribosylation; transfection of this cDNA into mouse L cells confirmed the mutation is sufficient for toxin resistance, establishing diphthamide as the essential ADP-ribosylation target on eEF2.\",\n      \"method\": \"cDNA cloning of toxin-resistant mutant; transfection into mouse L cells; cell-free ADP-ribosylation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — site-specific mutagenesis via natural variant confirmed by transfection and functional assay; replicated by multiple toxin-biology studies\",\n      \"pmids\": [\"2887567\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"SAPK4/p38δ phosphorylates eEF2 kinase (eEF2K) at Ser359 in vitro, causing eEF2K inactivation and consequent eEF2 dephosphorylation (activation); this phosphorylation is also induced in cells by anisomycin and IGF-1 and is blocked by a dominant-negative SAPK4/p38δ mutant, placing SAPK4/p38δ as an upstream inhibitor of eEF2K in the stress and growth-factor signaling pathway.\",\n      \"method\": \"In vitro kinase assay; substrate purification from skeletal muscle extract; cell-based phosphorylation with dominant-negative kinase overexpression\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro kinase assay identifying phosphorylation site plus cell-based epistasis with dominant-negative mutant; replicated in multiple signaling contexts\",\n      \"pmids\": [\"11500363\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Cdc2 (CDK1)-cyclin B phosphorylates eEF2K at Ser359 in vitro and in vivo; cdc2 activity against Ser359 peaks in mitosis coinciding with low eEF2 phosphorylation, indicating that CDK1-mediated inactivation of eEF2K keeps eEF2 active during mitosis to permit protein synthesis; amino-acid starvation decreases cdc2 activity against eEF2K while TSC2 loss (mTORC1 activation) increases it.\",\n      \"method\": \"Biochemical purification + tryptic mass fingerprinting; in vitro CDK1-cyclin B kinase assay; cell-cycle-stage-specific phosphorylation analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — kinase identified by purification and mass spectrometry, validated by in vitro assay, and placed in cell-cycle and nutrient-sensing context\",\n      \"pmids\": [\"18337751\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Cyclin A-CDK2 phosphorylates eEF2 at Ser595 in vitro and in vivo; S595 phosphorylation varies during the cell cycle, is required for efficient T56 phosphorylation by eEF2K in vivo, and directly stimulates eEF2 T56 phosphorylation by eEF2K in vitro, suggesting S595 recruits eEF2K to eEF2 — the first known eEF2 modification that regulates its own inhibition by eEF2K.\",\n      \"method\": \"In vitro CDK2-cyclin A kinase assay on eEF2; cell-cycle phosphorylation analysis; site-directed mutagenesis (S595A)\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of kinase reaction plus mutagenesis plus in-vivo cell-cycle validation; multiple orthogonal methods in one study\",\n      \"pmids\": [\"23184662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CPEB2 interacts with eEF2 to reduce eEF2/ribosome-triggered GTP hydrolysis in vitro and slows peptide elongation of CPEB2-bound RNA in vivo; under normoxia CPEB2-eEF2 interaction represses HIF-1α mRNA translation at the elongation step, and oxidative stress causes CPEB2 dissociation from HIF-1α mRNA, enabling rapid HIF-1α synthesis.\",\n      \"method\": \"Co-immunoprecipitation of CPEB2-eEF2; in vitro GTP hydrolysis assay; ribosome transit-time assay; RNA-binding and stress-response experiments\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro GTP hydrolysis assay plus Co-IP plus functional in-vivo elongation measurement; multiple orthogonal methods\",\n      \"pmids\": [\"22157746\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"FAM86A (eEF2-KMT) trimethylates eEF2 at Lys-525; the yeast orthologue Yjr129c (Efm3) methylates the equivalent Lys-509 in yeast eEF2 in vitro and in vivo; loss of this methylation causes increased -1 frameshifting and hypersensitivity to the eEF2-specific drug sordarin, establishing Lys methylation as a functionally important post-translational modification of eEF2.\",\n      \"method\": \"In vitro methyltransferase assay; yeast genetics (KO phenotype analysis); mass spectrometry to identify methylation site\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro enzyme assay plus in-vivo yeast mutant phenotypes (frameshifting, drug sensitivity); two organisms and multiple methods\",\n      \"pmids\": [\"25231979\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"HIV-1 Gag interacts with eEF2 via loops in the amino-terminal capsid domain to block stress granule (SG) assembly; cyclophilin A (CypA) stabilizes the Gag-eEF2 association; eEF2 depletion lifts the SG blockade but also impairs virus production and infectivity, and Gag recruits G3BP1 to disassemble preformed SGs by displacing eEF2.\",\n      \"method\": \"Co-immunoprecipitation; RNAi knockdown; stress granule assembly/disassembly imaging; viral infectivity assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP plus functional knockdown in multiple assays; single lab but orthogonal methods\",\n      \"pmids\": [\"25229650\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"p53 forms a salt-stable cytoplasmic complex with eEF2, confirmed by co-immunoprecipitation, anti-eEF2 antiserum recognition, diphtheria toxin ADP-ribosylation, and GTP photolabeling; the p53-eEF2 complex is found in both polyribosomal and subribosomal fractions; nuclear translocation of p53 decreases eEF2 binding; ts-p53 renaturation selectively alters p53 mRNA (not bulk mRNA) sensitivity to the elongation inhibitor cycloheximide.\",\n      \"method\": \"Co-immunoprecipitation; sucrose gradient sedimentation; ADP-ribosylation by diphtheria toxin; GTP photolabeling; ts-p53 renaturation experiment\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — multiple biochemical methods confirming complex; functional translation experiment linking p53 to elongation; single lab\",\n      \"pmids\": [\"12891704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Crystals of Saccharomyces cerevisiae eEF2 in complex with GDP were obtained and diffract to 2.85 Å, establishing the first purification and crystallization protocol for eukaryotic eEF2 and enabling subsequent structural studies.\",\n      \"method\": \"Protein purification from industrial yeast; vapor-diffusion crystallization; X-ray diffraction\",\n      \"journal\": \"Acta crystallographica. Section D, Biological crystallography\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — structural result (crystal obtained) but paper reports crystallization only, not a solved structure with functional interpretation\",\n      \"pmids\": [\"11914505\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Oxidation of Trp221 in eEF-2 (but not Trp343) by N-bromosuccinimide inactivates its ribosome-dependent GTPase and polyphenylalanine synthesis activities without preventing GTP binding or ribosome·eEF-2·GMPPNP complex formation; oxidized eEF-2 fails to protect ribosomes against ricin inactivation, suggesting Trp221 or its surrounding sequence contacts the GAGA loop of 28S rRNA at the sarcin-ricin site.\",\n      \"method\": \"Chemical modification (N-bromosuccinimide); GTPase and polyphenylalanine synthesis assays; ricin protection assay; ribosome complex formation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — chemical mutagenesis with multiple functional readouts defining a specific residue-rRNA interaction; single lab\",\n      \"pmids\": [\"8253723\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The U5 snRNP 116-kDa protein, a homologue of ribosomal elongation factor EF-2, forms a stable RNA-free complex with the U5-200kDa RNA unwindase, U5-220kDa (hPrp8), and U5-40kDa (a novel WD-40 protein) as shown by sedimentation analysis of dissociated U5 snRNP; hPrp8 binds simultaneously to the 40-kDa and 116-kDa proteins, positioning the EF-2 homologue within the spliceosomal architecture.\",\n      \"method\": \"Sedimentation analysis of chaotrope-dissociated U5 snRNP; cDNA cloning; biochemical co-fractionation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — this involves the EF-2 homologue within U5 snRNP (116kD protein), not canonical eEF2 itself; single sedimentation method; included for completeness as a binding-partner finding\",\n      \"pmids\": [\"9774689\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"eEF2 kinase is bound to Hsp90 as demonstrated by co-adsorption with anti-Hsp90 immunoadsorbents from partly purified kinase preparations and crude reticulocyte lysates, establishing Hsp90 as a chaperone partner of the eEF2K-eEF2 regulatory complex.\",\n      \"method\": \"Immunoadsorption (anti-Hsp90 monoclonal antibody); co-purification from reticulocyte lysate\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single immunoadsorption method; finding pertains directly to eEF2K but contextualizes eEF2 regulation; single lab, single method\",\n      \"pmids\": [\"8050573\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Geldanamycin (GA) disrupts the EF-2 kinase/Hsp90 protein complex as measured by co-immunoprecipitation, leading to decreased eEF2K protein in cell lysates; overexpression of eEF2K abrogates GA-mediated glioma cell killing, demonstrating that destruction of eEF2K downstream of Hsp90 disruption is a cytotoxic mechanism of GA in glioma.\",\n      \"method\": \"Co-immunoprecipitation; eEF2K overexpression rescue; clonogenic survival assay; xenograft model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — co-IP plus overexpression rescue plus in vivo model; establishes Hsp90-eEF2K complex and its functional importance for eEF2 regulation\",\n      \"pmids\": [\"11358819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Post-training dephosphorylation of eEF2 (activation) occurs within 0.5–2 h in hippocampus and amygdala after fear conditioning; blockade of NMDA receptors impedes this dephosphorylation and memory retention; hippocampus-specific overexpression of eEF2K inhibits protein synthesis and impairs late-phase LTP and long-term hippocampus-dependent memory without affecting short-term memory.\",\n      \"method\": \"Western blot of phospho-eEF2 post-training; NMDA receptor antagonist (MK-801); transgenic overexpression of eEF2K in hippocampus; LTP electrophysiology; behavioral memory tests\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean transgenic loss-of-function with defined synaptic and behavioral phenotypes; NMDA-receptor dependence established pharmacologically; single lab\",\n      \"pmids\": [\"19823585\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Diphthamide modification of eEF2 requires the J-domain protein Dph4; cells from Dph4 mutant mouse embryos lack diphthamide on eEF2 and are resistant to diphtheria toxin killing; Dph4-null mice show growth retardation, embryonic lethality, and preaxial polydactyly identical to Dph1 mutants, establishing that diphthamide is required for normal vertebrate development, likely through translational fidelity of specific proteins.\",\n      \"method\": \"Mouse genetics (ENU mutant); diphtheria toxin resistance assay; immunolocalization of Dph4; phenotypic analysis of homozygous mutants\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function with biochemical and developmental phenotype readouts; single lab but multiple assays\",\n      \"pmids\": [\"18765564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"eEF2 catalyzes ribosomal reverse translocation (backward by one mRNA triplet) in a reconstituted mammalian translation system; this requires a cognate tRNA in the E-site and cannot occur spontaneously; efficiency increases with eEF2 concentration and non-hydrolyzable GTP analogues; ADP-ribosylation of eEF2 domain IV blocks reverse translocation, establishing domain IV-ribosome interaction as critical for catalysis in both directions.\",\n      \"method\": \"Reconstituted in vitro mammalian translation system; ADP-ribosylation of eEF2 (diphtheria toxin); non-hydrolyzable GTP analogues; measurement of ribosomal reverse translocation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstituted system with defined biochemical perturbations (ADP-ribosylation, GTP analogues, E-site tRNA requirement); single lab but multiple orthogonal manipulations\",\n      \"pmids\": [\"29453282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Ribosomal stress activates the eEF2K-eEF2 pathway, inhibiting translation elongation; this leads to translational reprogramming in which TOP mRNAs (encoding ribosomal proteins and translation factors) are paradoxically recruited onto polysomes, increasing their relative translation while global protein synthesis decreases.\",\n      \"method\": \"Ribosome biogenesis defect models; phospho-eEF2 Western blot; polysome profiling; TOP mRNA-specific translation analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — polysome profiling plus phospho-Western in defined stress model; single lab but multiple readouts\",\n      \"pmids\": [\"25332393\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PQBP1 binds specifically to non-phosphorylated eEF2 and suppresses eEF2K-mediated phosphorylation at Thr56; PQBP1 loss reduces general protein synthesis by suppressing translational elongation and impairs hippocampal mGluR-LTD and associated behaviors.\",\n      \"method\": \"Co-immunoprecipitation; phospho-eEF2 Western blot; polysome profiling; SUnSET protein synthesis assay; hippocampal LTD electrophysiology; behavioral assays in PQBP1-KO mice\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, genetic KO with defined synaptic and behavioral phenotypes, multiple orthogonal methods in one study\",\n      \"pmids\": [\"33662272\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"C-terminal Src kinase (Csk) phosphorylates eEF2 on a tyrosine residue; this phosphorylation does not affect cytoplasmic translation but promotes proteolytic cleavage of eEF2 and SUMOylation-dependent nuclear translocation of the cleaved fragment; nuclear eEF2 fragments induce nuclear morphological changes and aneuploidy.\",\n      \"method\": \"In vitro kinase assay (Csk on eEF2); co-immunoprecipitation; immunofluorescence nuclear localization; SUMO pathway manipulation; overexpression of eEF2 fragments\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — in vitro kinase assay plus cell-based localization and functional assays; single lab\",\n      \"pmids\": [\"24648518\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"During myocardial ischemia-reperfusion, phosphorylated eEF2 is SUMOylated and translocates to the nucleus of cardiomyocytes; eEF2 overexpression upregulates Bcl-2 to reduce apoptosis, while the N-terminal fragment of eEF2 promotes apoptosis, indicating a bidirectional role of eEF2 in cardiomyocyte apoptosis during ischemia-reperfusion.\",\n      \"method\": \"In vivo rat ischemia-reperfusion model; immunocytochemistry; immunofluorescence; Western blot; flow cytometry apoptosis assay; eEF2 fragment transfection\",\n      \"journal\": \"Journal of cardiology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, descriptive nuclear translocation without direct mechanistic dissection of SUMOylation writer/reader\",\n      \"pmids\": [\"27401398\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TGFβ activates eEF2 (decreases Thr56 phosphorylation) via an Erk1/2-dependent activation of p90Rsk, which phosphorylates and inactivates eEF2K; dominant-negative p90Rsk reverses TGFβ-induced eEF2 dephosphorylation and eEF2K inhibition, and attenuates TGFβ-induced protein synthesis and mesangial cell hypertrophy.\",\n      \"method\": \"Kinase inhibitors (Erk1/2); dominant-negative p90Rsk; phospho-Western blot; protein synthesis measurement; cell hypertrophy assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dominant-negative epistasis plus inhibitor confirmation; single lab, two orthogonal approaches\",\n      \"pmids\": [\"20837011\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In yeast, loss of diphthamide modification on eEF2 (dphΔ) combined with reduced eEF2 availability (eft2Δ) causes synthetic growth defects, increased -1 ribosomal frameshifting, and hypersensitivity to translation-perturbing drugs (hygromycin, anisomycin), demonstrating that diphthamide on eEF2 is important for translational fidelity of the EF2 translocation function.\",\n      \"method\": \"Yeast genetic analysis (SGA interactions, double mutants); frameshifting reporter assay; drug sensitivity assays; competitive fitness assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis analysis with multiple functional readouts in defined yeast mutants; single lab\",\n      \"pmids\": [\"30335802\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Genetic reduction of eEF2 in excitatory neurons of the mouse medial prefrontal cortex (mPFC) reduces protein synthesis, lowers dendritic spine density, reduces excitability, and diminishes AMPAR-mediated synaptic transmission, resulting in defective social novelty behavior and elevated anxiety; chemogenetic activation of mPFC excitatory neurons or AMPAR potentiation rescues the social novelty deficit.\",\n      \"method\": \"Eef2 heterozygous mouse; region-specific viral knockdown; electrophysiology; SUnSET protein synthesis; DREADD chemogenetics; AMPAR potentiator pharmacology; behavioral assays\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic model with region-specific KD and multiple orthogonal rescue strategies; single lab\",\n      \"pmids\": [\"35993189\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"eIF5A genetically interacts with eEF2 during translation elongation in yeast: the eIF5A(K56A) hypusine-deficient mutant is synthetically sick with the dominant-negative eEF2(H699K) mutant; high-copy eEF2 suppresses growth, cell-size, protein synthesis, and polysome profile defects of eIF5A(K56A), placing eIF5A and eEF2 in the same elongation pathway.\",\n      \"method\": \"Yeast genetic epistasis (synthetic sickness, high-copy suppression); polysome profiling; protein synthesis measurement; hygromycin B sensitivity assay\",\n      \"journal\": \"Amino acids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with multiple phenotypic readouts; single lab\",\n      \"pmids\": [\"21822730\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In fast-twitch skeletal muscle, inhibition of eEF2K completely blunts the contraction-induced increase in eEF2 phosphorylation and partially (30–40%) blunts the suppression of protein synthesis; the eEF2K activation is downstream of Ca2+/calmodulin but independent of AMPK, as demonstrated by intact protein synthesis suppression in muscles overexpressing kinase-dead AMPK.\",\n      \"method\": \"Ex vivo muscle contraction; eEF2K inhibitor; kinase-dead AMPK overexpression; protein synthesis (ribosome transit time); Ca2+ manipulation\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibition plus dominant-negative transgenic model; single lab, two orthogonal approaches\",\n      \"pmids\": [\"19188248\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Stm1 (yeast stress protein) stabilizes eEF2 on the 80S ribosome in the GTP-bound form independently of eEF2's diphthamide modification; Stm1 does not inhibit eEF2 GTPase activity during the first GTP hydrolysis round; the core region of Stm1 (aa 47–143) is required for ribosome binding and eEF2 stabilization.\",\n      \"method\": \"Reconstituted yeast cell-free translation system; biochemical analysis of eEF2-ribosome binding in presence of Stm1; Stm1 truncation mutant analysis; GTPase assay\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro reconstituted system with defined mutants; single lab\",\n      \"pmids\": [\"29069440\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NAT10-mediated ac4C modification within the coding sequence of HMGB2 mRNA facilitates eEF2 binding to the ac4C sites, enhancing HMGB2 mRNA translation; eEF2 is identified as a reader of ac4C mRNA modifications that promotes translation of ac4C-modified transcripts.\",\n      \"method\": \"RNA immunoprecipitation (RIP); RNA pulldown; mass spectrometry; ribosome profiling; site-specific ac4C mutation; nascent protein synthesis assay\",\n      \"journal\": \"Cancer communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA pulldown plus RIP plus ribosome profiling plus site-specific mutation; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"39030964\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Rpl24 (ribosomal protein) mutation suppresses translation elongation through phosphorylation of eEF2 (reducing protein synthesis by ~40% in tumour cells), and genetic inactivation of eEF2K in Rpl24 mutant mice completely restores elongation rates and protein synthesis, as well as abolishing tumour suppression in a colorectal cancer model.\",\n      \"method\": \"Rpl24 mutant mouse; eEF2K genetic ablation rescue; polysome profiling; SUnSET protein synthesis assay; colorectal cancer mouse model tumorigenesis assay\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis (double mutant complete rescue), quantitative protein synthesis measurement, and in vivo tumor model; multiple orthogonal methods\",\n      \"pmids\": [\"34895463\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LDHA interacts with eEF2 in the cytoplasm in an NADH-dependent manner, sequestering eEF2 away from the ribosome; LDHA knockout or NADH-competitive LDHA inhibitors release eEF2, upregulate translation, and enhance megakaryocyte (MK) maturation and platelet production both in vitro and in vivo.\",\n      \"method\": \"Co-immunoprecipitation; MK/platelet-specific Ldha knockout mouse; NADH manipulation; LDHA inhibitor treatment; in vitro MK maturation assay; in vivo platelet count\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP establishing interaction, genetic KO with functional rescue, in vivo model; single lab\",\n      \"pmids\": [\"35176139\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"eEF2 is a GTPase that catalyzes GTP-dependent translocation of mRNA-tRNA complexes from the ribosomal A site to the P site (and, in vitro, in reverse); its activity is primarily regulated by phosphorylation at Thr56 by the Ca2+/calmodulin-dependent eEF2 kinase (eEF2K), which completely inhibits translocation, while additional regulatory inputs include CDK1-cyclin B and CDK2-cyclin A phosphorylation of eEF2K (Ser359) or eEF2 itself (Ser595), SAPK4/p38δ-mediated eEF2K Ser359 phosphorylation, p90Rsk-mediated eEF2K inhibition downstream of TGFβ-Erk1/2, AMPK-dependent eEF2K activation under nutrient stress, PP2A-mediated eEF2 dephosphorylation, and trimethylation at Lys525 by FAM86A; eEF2 is also ADP-ribosylated at its unique diphthamide residue (modified His) by bacterial toxins (diphtheria toxin, Pseudomonas exotoxin A, Cholix), which irreversibly blocks translocation, and structurally, cryo-EM and crystal structures of eEF2-ribosome and eEF2-toxin complexes have revealed the conformational rearrangements and domain IV-rRNA contacts that drive tRNA movement and explain toxin recognition.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"eEF2 is the translocase GTPase of eukaryotic translation elongation, catalyzing the GTP-dependent shift of the mRNA-tRNA complex from the ribosomal A site to the P site [#1]; in reconstituted mammalian systems it also drives reverse translocation, and in both directions catalysis depends on domain IV-ribosome contacts [#20]. Structural work has resolved how these movements occur: cryo-EM of the 80S\\u00b7eEF2 complex revealed large ratchet-like subunit rearrangements coupled to domain III contacts with the sarcin-ricin loop [#2], and comparison of pre- and post-GTP-hydrolysis states using ADP-ribosylated eEF2 as a fiducial showed that GTP hydrolysis induces eEF2 conformational changes sufficient to uncouple the mRNA-tRNA complex from the decoding-center bases A1492/A1493, supporting a two-step model of ratcheting followed by hydrolysis-driven displacement [#4]. eEF2 activity is gated principally by phosphorylation: the Ca2+/calmodulin-dependent eEF2 kinase phosphorylates eEF2 at Thr56, completely inactivating it and blocking the translocation step, with activity restored by phosphatase dephosphorylation [#0, #1]. This eEF2K-eEF2 axis integrates diverse upstream signals \\u2014 CDK1-cyclin B and SAPK4/p38\\u03b4 phosphorylation that inactivates eEF2K [#6, #7], CDK2-cyclin A phosphorylation of eEF2 itself at Ser595 that recruits eEF2K to promote Thr56 phosphorylation [#8], and TGF\\u03b2-Erk1/2-p90Rsk signaling and contraction-induced Ca2+/calmodulin inputs that tune elongation rate during growth and muscle work [#25, #29]. eEF2 carries a unique diphthamide residue, the essential ADP-ribosylation target of diphtheria toxin and Pseudomonas exotoxin A, and a single substitution adjacent to it confers toxin resistance [#5]; structural analysis of the exotoxin A-eEF2 complex shows the diphthamide spans the catalytic cleft to trigger NAD+ cleavage, with toxin recognition mimicking ribosomal nucleotide contacts [#3], while diphthamide loss impairs translational fidelity and is required for normal vertebrate development [#19, #26]. Through phosphorylation-controlled elongation, eEF2 mediates translational reprogramming under ribosomal stress [#21, #32] and gates protein-synthesis-dependent synaptic plasticity, memory, and behavior in neurons [#18, #22, #27]. eEF2 additionally serves as a regulatory hub bound by trans-acting factors \\u2014 CPEB2 dampens its ribosomal GTP hydrolysis to repress HIF-1\\u03b1 mRNA elongation [#9], PQBP1 binds non-phosphorylated eEF2 to block Thr56 phosphorylation [#22], and LDHA sequesters eEF2 from ribosomes in an NADH-dependent manner [#33].\",\n  \"teleology\": [\n    {\n      \"year\": 1989,\n      \"claim\": \"Established the precise elongation step eEF2 executes and how phosphorylation shuts it off, defining the molecular basis of elongation control.\",\n      \"evidence\": \"In vitro translation and puromycin-reactivity translocation assays with phosphatase reactivation in cell-free systems\",\n      \"pmids\": [\"3386756\", \"2753158\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the structural transitions underlying translocation\", \"The full upstream signaling that controls eEF2K was not yet mapped\"]\n    },\n    {\n      \"year\": 1987,\n      \"claim\": \"Identified diphthamide as the essential ADP-ribosylation target on eEF2 exploited by bacterial toxins, linking a unique modified residue to toxin sensitivity.\",\n      \"evidence\": \"cDNA cloning of a toxin-resistant variant and transfection into mouse L cells with cell-free ADP-ribosylation assay\",\n      \"pmids\": [\"2887567\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The endogenous cellular function of diphthamide was not addressed\", \"Structural basis of toxin recognition not yet known\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Resolved how toxins recognize and chemically attack the diphthamide, explaining universal eEF2 targeting through ribosome mimicry.\",\n      \"evidence\": \"Four X-ray crystal structures of the Pseudomonas exotoxin A-eEF2 complex with a non-hydrolysable NAD+ analogue\",\n      \"pmids\": [\"16107839\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address physiological diphthamide function\", \"Translocation mechanism on the ribosome addressed by separate structures\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined the conformational logic of translocation, showing GTP hydrolysis drives tRNA-mRNA displacement after eEF2 binding induces ribosomal ratcheting.\",\n      \"evidence\": \"Cryo-EM of 80S\\u00b7eEF2 (sordarin-stalled) and of ADP-ribosylated eEF2 before/after GTP hydrolysis\",\n      \"pmids\": [\"14976550\", \"17446867\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic-resolution intermediate states not fully resolved\", \"Coupling of phosphorylation to these conformational steps not structurally shown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Mapped the signaling network converging on eEF2K to set elongation rate, connecting cell-cycle and stress kinases to eEF2 phosphorylation.\",\n      \"evidence\": \"In vitro kinase assays plus cell-based epistasis (dominant-negative, mass-fingerprinting) for SAPK4/p38\\u03b4 and CDK1-cyclin B on eEF2K Ser359\",\n      \"pmids\": [\"11500363\", \"18337751\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution of each kinase in vivo not resolved\", \"Cross-talk among parallel inputs not defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed eEF2 itself can be phosphorylated to recruit eEF2K, revealing a feed-forward layer where CDK2 priming promotes inhibitory Thr56 phosphorylation.\",\n      \"evidence\": \"In vitro CDK2-cyclin A kinase assay on eEF2 Ser595 with S595A mutagenesis and cell-cycle phospho-analysis\",\n      \"pmids\": [\"23184662\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of eEF2K recruitment to phospho-Ser595 not defined\", \"Physiological extent of cell-cycle elongation control not quantified\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Extended eEF2K regulation to growth-factor and contractile signaling, showing TGF\\u03b2-Erk-p90Rsk and Ca2+/calmodulin inputs tune eEF2 activity in tissue contexts.\",\n      \"evidence\": \"Dominant-negative p90Rsk and kinase inhibitors in mesangial cells; eEF2K inhibition and kinase-dead AMPK in ex vivo muscle\",\n      \"pmids\": [\"20837011\", \"19188248\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"AMPK-independent contraction signaling only partially accounts for synthesis suppression\", \"Single-lab tissue models\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Placed eEF2 within the broader elongation machinery and as a target of trans-acting translational repressors, expanding its role beyond bulk translocation.\",\n      \"evidence\": \"Yeast genetic epistasis with eIF5A; Co-IP and in vitro GTP hydrolysis/transit-time assays for CPEB2 repression of HIF-1\\u03b1 mRNA\",\n      \"pmids\": [\"21822730\", \"22157746\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural mode of CPEB2-eEF2 inhibition unknown\", \"Generality of mRNA-selective elongation repression unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined two post-translational modification layers of eEF2 \\u2014 Lys525 trimethylation by FAM86A and a Csk tyrosine phosphorylation that triggers nuclear translocation of a cleaved fragment \\u2014 linking eEF2 modifications to fidelity and to non-translational nuclear effects.\",\n      \"evidence\": \"In vitro methyltransferase and kinase assays; yeast genetics (frameshifting, sordarin sensitivity); SUMO-dependent localization and fragment overexpression\",\n      \"pmids\": [\"25231979\", \"24648518\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional reader/role of Lys525 methylation in mammals not established\", \"Physiological significance of nuclear eEF2 fragments uncertain\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrated eEF2 catalyzes reverse translocation requiring domain IV-ribosome contacts, and that diphthamide supports translocation fidelity, unifying the catalytic and modification roles.\",\n      \"evidence\": \"Reconstituted mammalian translation with ADP-ribosylation and GTP analogues; yeast dph\\u0394/eft2\\u0394 epistasis with frameshifting and drug-sensitivity readouts\",\n      \"pmids\": [\"29453282\", \"30335802\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological occurrence of reverse translocation unclear\", \"Identity of fidelity-critical transcripts requiring diphthamide unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Connected eEF2-controlled elongation to synaptic plasticity and behavior, and to translational reprogramming and tumor suppression under ribosomal stress.\",\n      \"evidence\": \"PQBP1- and Eef2-mutant mice with electrophysiology, SUnSET, polysome profiling, chemogenetic/pharmacological rescue; Rpl24-eEF2K double-mutant colorectal cancer model\",\n      \"pmids\": [\"33662272\", \"35993189\", \"34895463\", \"25332393\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transcript selectivity of stress-induced reprogramming not fully defined\", \"Circuit-level mechanism linking elongation rate to behavior incomplete\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified eEF2 as a reader of ac4C-modified mRNA and a target of metabolic sequestration, broadening its regulatory inputs to RNA modification and redox state.\",\n      \"evidence\": \"RIP/RNA pulldown/ribosome profiling for ac4C reading; Co-IP and Ldha knockout with NADH manipulation for LDHA sequestration\",\n      \"pmids\": [\"39030964\", \"35176139\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of eEF2 ac4C recognition unknown\", \"Single-lab findings awaiting independent confirmation\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the diverse upstream inputs (cell-cycle, growth-factor, stress, metabolic, RNA-modification) are integrated quantitatively to set elongation rate on specific transcripts in vivo remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified quantitative model of competing eEF2 regulatory inputs\", \"Transcript-specific elongation control mechanisms not mapped\", \"Atomic structures coupling phosphorylation state to translocation conformations lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003924\", \"supporting_discovery_ids\": [2, 4, 9, 30]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [1, 20]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [31]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [2, 4, 30]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [9, 33]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [23, 24]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-72766\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 20]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [9, 31]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [3, 5]}\n    ],\n    \"complexes\": [\"80S ribosome elongation complex\"],\n    \"partners\": [\"EEF2K\", \"CPEB2\", \"PQBP1\", \"LDHA\", \"CDK2\", \"NAT10\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":4,"faith_total":4,"faith_pct":100.0}}