{"gene":"PF3D7_0315100","run_date":"2026-09-07T10:55:51","timeline":{"discoveries":[{"year":2007,"finding":"P. falciparum eIF4E (PF3D7_0315100) was purified as a recombinant protein and demonstrated to have canonical mRNA 5' cap binding activity; it was used to affinity-purify capped mRNAs from total parasite RNA, establishing its role as a functional cap-binding protein in P. falciparum.","method":"Recombinant protein purification and cap-binding affinity assay (in vitro biochemical assay)","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — direct in vitro biochemical demonstration of cap-binding activity, single lab, single method","pmids":["17692399"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2009,"finding":"P. falciparum eIF4E (PF3D7_0315100) interacts with eIF4G, and is a component of the P. falciparum eIF4F translation initiation complex together with eIF4A and eIF4G; eIF4G contains binding sites for eIF4E and also interacts with PABP.","method":"Protein interaction assay (demonstrated interaction of PfeIF4G with PfeIF4E); bioinformatics/molecular modeling for structural characterization","journal":"Parasitology international","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single interaction assay with limited methodological detail in abstract","pmids":["19751846"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2010,"finding":"P. falciparum eIF4E (PF3D7_0315100) and eIF4A co-localize predominantly in the cytoplasm of asexual intraerythrocytic stages; co-addition of dsRNA targeting both eIF4E and eIF4A resulted in ~67% inhibition of parasite growth, establishing both as critical for parasite proliferation.","method":"Immunofluorescence assay for co-localization; dsRNA-mediated knockdown with parasite growth inhibition assay","journal":"Communicative & integrative biology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, localization by IFA and combined dsRNA knockdown without individual gene-specific growth data for eIF4E alone","pmids":["21331256"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2010,"finding":"In P. berghei gametocytes, eIF4E is a component of a DOZI/CITH-containing messenger ribonucleoprotein (mRNP) complex that stores translationally silent mRNAs; this mRNP integrates eIF4E and poly(A)-binding protein but excludes P-body RNA degradation factors and translation-initiation-promoting eIF4G, placing eIF4E in a repressive mRNP distinct from the canonical eIF4F complex.","method":"Affinity purification coupled with mass spectrometry (AP-MS) from P. berghei gametocytes","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — AP-MS identification in a defined complex, with functional validation via gene deletion mutants of complex components in the same study","pmids":["20169188"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2013,"finding":"P. falciparum eIF4E (PF3D7_0315100) physically interacts with the DEAD-box RNA helicase DOZI (PfDZ50), primarily through DOZI's domain 1; addition of exogenous eIF4E restored ~70% of translation that was inhibited by PfDZ50 in an in vitro translation assay, indicating eIF4E functionally counteracts DOZI-mediated translational repression.","method":"Co-immunoprecipitation/pulldown interaction assay; in vitro translation assay with recombinant proteins; immunofluorescence assay for localization","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct protein interaction mapped to a domain plus functional rescue in in vitro translation assay, single lab","pmids":["23562722"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2021,"finding":"Native P. falciparum eIF4E (PF3D7_0315100) was the most reproducibly enriched protein in a 5' cap affinity pull-down from asexual-stage parasites, confirming its role as the primary cap-binding protein in vivo; eIF4A and eIF4G were also detected but with low reproducibility, suggesting a loose or transient eIF4F complex association.","method":"5' cap affinity matrix enrichment of native proteins from asexual-stage parasite lysates followed by proteomic (mass spectrometry) analysis","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — native protein affinity enrichment with proteomic identification, single lab, confirms cap-binding function in vivo","pmids":["34890716"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2021,"finding":"P. falciparum eIF4E (PF3D7_0315100) was used as a functional tool to enrich full-length 5'-capped mRNAs from ring, trophozoite, and schizont stages via cap-binding affinity, enabling transcriptome-wide mapping of 5' capped transcript ends, which confirmed eIF4E's cap-binding function across intraerythrocytic developmental stages.","method":"Cap-affinity enrichment of full-length cDNA coupled with next-generation sequencing (transcriptomic method)","journal":"PeerJ","confidence":"Low","confidence_rationale":"Tier 3 / Weak — eIF4E used instrumentally as a reagent; cap-binding activity is inferred from enrichment rather than directly assayed, single lab","pmids":["34527439"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"P. falciparum eIF4E (PF3D7_0315100) is the primary mRNA 5' cap-binding protein of the parasite, functioning as the cap-recognition subunit of the eIF4F translation initiation complex (with eIF4A and eIF4G) in the cytoplasm of asexual stages, and additionally participating in a translationally repressive DOZI/CITH-containing mRNP in gametocytes where it is sequestered away from eIF4G; its interaction with the RNA helicase DOZI can be functionally overcome by exogenous eIF4E to restore translation in vitro."},"narrative":{"mechanistic_narrative":"PF3D7_0315100 (eIF4E) is the primary mRNA 5' cap-binding protein of Plasmodium falciparum and serves as the cap-recognition subunit that couples 5'-capped transcripts to the translation machinery [PMID:17692399, PMID:34890716]. Recombinant eIF4E possesses canonical cap-binding activity and can be used to affinity-purify capped mRNAs from parasite RNA [PMID:17692399], and native eIF4E is the most reproducibly enriched protein in 5' cap affinity pull-downs from asexual-stage parasites, confirming this role in vivo [PMID:34890716]. In asexual intraerythrocytic stages, eIF4E interacts with eIF4G and, together with eIF4A, forms the eIF4F translation initiation complex, though the low reproducibility of eIF4A/eIF4G co-enrichment indicates a loose or transient association [PMID:19751846, PMID:34890716]; eIF4E and eIF4A co-localize predominantly in the cytoplasm and are together critical for parasite proliferation [PMID:21331256]. Beyond canonical initiation, eIF4E participates in a translationally repressive program: in P. berghei gametocytes it is a component of a DOZI/CITH-containing mRNP that stores translationally silent mRNAs, incorporating poly(A)-binding protein but excluding eIF4G [PMID:20169188], and in P. falciparum eIF4E physically interacts with the DEAD-box helicase DOZI (PfDZ50) through DOZI's domain 1, an interaction that can be functionally overcome by exogenous eIF4E to restore translation in vitro [PMID:23562722]. No structural model, regulatory phosphorylation, or individual gene-specific loss-of-function phenotype for eIF4E has been characterized in the available corpus.","teleology":[{"year":2007,"claim":"Establishing whether the parasite encodes a functional cap-binding protein was the first step in defining how P. falciparum recognizes mRNA for translation; recombinant eIF4E was shown to bind the 5' cap and to affinity-purify capped mRNAs.","evidence":"Recombinant protein purification and in vitro cap-binding affinity assay","pmids":["17692399"],"confidence":"Medium","gaps":["Single lab, single method","No in vivo confirmation at this stage","Cap-binding affinity/specificity not quantified against variant cap structures"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2009,"claim":"To place eIF4E in the initiation machinery, its interaction with eIF4G was tested, positioning eIF4E as a subunit of the parasite eIF4F complex alongside eIF4A and eIF4G.","evidence":"Protein interaction assay with bioinformatic/structural modeling","pmids":["19751846"],"confidence":"Low","gaps":["Single interaction assay with limited methodological detail","Binding stoichiometry and affinity not defined","No reciprocal in vivo validation"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2010,"claim":"The subcellular location and functional importance of eIF4E were probed to link cap-binding to parasite growth; eIF4E and eIF4A localize to the cytoplasm and combined knockdown strongly inhibits proliferation.","evidence":"Immunofluorescence co-localization plus combined dsRNA knockdown and growth inhibition assay","pmids":["21331256"],"confidence":"Low","gaps":["No eIF4E-alone knockdown data — growth effect is from combined eIF4E/eIF4A dsRNA","Off-target effects of dsRNA not excluded","Cytoplasmic localization not resolved to specific compartments"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2010,"claim":"Whether eIF4E functions only in active initiation or also in translational repression was addressed by characterizing gametocyte mRNP complexes; eIF4E was found in a DOZI/CITH mRNP that stores silent mRNAs and excludes eIF4G.","evidence":"Affinity purification coupled with mass spectrometry from P. berghei gametocytes, with gene-deletion validation of complex components","pmids":["20169188"],"confidence":"Medium","gaps":["Shown in P. berghei, not P. falciparum","eIF4E's specific role within the repressive mRNP not dissected by its own deletion","Mechanism of eIF4E partitioning between eIF4F and the mRNP unknown"],"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2013,"claim":"To test whether the eIF4E–DOZI association is direct and functionally consequential, the interaction was mapped and reconstituted; eIF4E binds DOZI domain 1 and exogenous eIF4E relieves DOZI-mediated translational repression in vitro.","evidence":"Co-immunoprecipitation/pulldown, domain mapping, in vitro translation rescue assay, and immunofluorescence","pmids":["23562722"],"confidence":"Medium","gaps":["In vitro rescue may not reflect in vivo stoichiometry","Single lab","How the eIF4E–DOZI equilibrium is regulated in gametocytes not established"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2021,"claim":"Whether eIF4E is the principal cap-binding protein in intact parasites, versus one of several, was confirmed by native cap-affinity proteomics; eIF4E was the most reproducibly enriched cap-binder, while eIF4A/eIF4G enriched only weakly.","evidence":"5' cap affinity enrichment of native proteins from asexual-stage lysates with mass spectrometry","pmids":["34890716"],"confidence":"Medium","gaps":["Loose/transient eIF4F assembly inferred, not directly demonstrated","Stage-specific composition of cap-binding complexes not resolved","No quantitative comparison across developmental stages"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2021,"claim":"eIF4E's cap-binding activity was exploited as a reagent to map 5'-capped transcript ends across asexual stages, reinforcing that its cap recognition operates throughout intraerythrocytic development.","evidence":"Cap-affinity enrichment of full-length cDNA coupled with next-generation sequencing","pmids":["34527439"],"confidence":"Low","gaps":["Cap-binding inferred from enrichment rather than directly assayed","Used instrumentally, not to test eIF4E biology per se","No functional readout for eIF4E itself"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":null,"claim":"How eIF4E is partitioned between the active eIF4F complex and the repressive DOZI/CITH mRNP, and what regulates this switch during the transition to gametocyte stages, remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of eIF4E or its complexes","No eIF4E-specific conditional loss-of-function phenotype","Regulatory modifications controlling eIF4E partitioning unknown"],"attribution":[]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["eIF4F translation initiation complex (with eIF4A and eIF4G)","DOZI/CITH-containing translationally repressive mRNP (P. berghei gametocytes)"],"partners":["EIF4G","EIF4A","DOZI (PFDZ50) DEAD-BOX RNA HELICASE","POLY(A)-BINDING PROTEIN (WITHIN DOZI/CITH MRNP)"],"other_free_text":["Most reproducibly enriched cap-binding protein in native asexual-stage cap-affinity proteomics [#5]","eIF4A/eIF4G co-enrich weakly, indicating loose or transient eIF4F association [#5]","Exogenous eIF4E relieves DOZI-mediated translational repression in vitro (~70% restoration) [#4]","Combined eIF4E/eIF4A dsRNA knockdown inhibits parasite growth ~67%; no eIF4E-alone phenotype available [#2]"]}},"prefetch_data":{},"corpus_meta":[{"pmid":"20169188","id":"PMC_20169188","title":"Universal features of post-transcriptional gene regulation are critical for Plasmodium zygote development.","date":"2010","source":"PLoS pathogens","url":"https://pubmed.ncbi.nlm.nih.gov/20169188","citation_count":216,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["eIF4E"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"23562722","id":"PMC_23562722","title":"Plasmodium falciparum DOZI, an RNA helicase interacts with eIF4E.","date":"2013","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/23562722","citation_count":29,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["eIF4E","PfeIF4E"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"17692399","id":"PMC_17692399","title":"Characterization of human malaria parasite Plasmodium falciparum eIF4E homologue and mRNA 5' cap status.","date":"2007","source":"Molecular and biochemical parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/17692399","citation_count":21,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["eIF4E"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"19641745","id":"PMC_19641745","title":"Identification and bioinformatics characterization of translation initiation complex eIF4F components and poly(A)-binding protein from Plasmodium falciparum.","date":"2009","source":"Communicative & integrative biology","url":"https://pubmed.ncbi.nlm.nih.gov/19641745","citation_count":19,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["eIF4E","PfeIF4E"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"19751846","id":"PMC_19751846","title":"Isolation and functional characterization of eIF4F components and poly(A)-binding protein from Plasmodium falciparum.","date":"2009","source":"Parasitology international","url":"https://pubmed.ncbi.nlm.nih.gov/19751846","citation_count":16,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["eIF4E","PfeIF4E"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"21331256","id":"PMC_21331256","title":"PfeIF4E and PfeIF4A colocalize and their double-stranded RNA inhibits Plasmodium falciparum proliferation.","date":"2010","source":"Communicative & integrative biology","url":"https://pubmed.ncbi.nlm.nih.gov/21331256","citation_count":13,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["eIF4E","PfeIF4E"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"34527439","id":"PMC_34527439","title":"Identifying transcript 5' capped ends in Plasmodium falciparum.","date":"2021","source":"PeerJ","url":"https://pubmed.ncbi.nlm.nih.gov/34527439","citation_count":4,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["eIF4E"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"34890716","id":"PMC_34890716","title":"Identification of mRNA 5' cap-associated proteins in the human malaria parasite Plasmodium falciparum.","date":"2021","source":"Molecular and biochemical parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/34890716","citation_count":2,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["eIF4E"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"42615421","id":"PMC_42615421","title":"Poly(A)-binding proteins in trypanosomatids and Plasmodium.","date":"2026","source":"Journal of biosciences","url":"https://pubmed.ncbi.nlm.nih.gov/42615421","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["eIF4E"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":6685,"output_tokens":2011,"usd":0.02511,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":7177,"output_tokens":3346,"usd":0.059768,"stage2_stop_reason":"end_turn"},"total_usd":0.084878,"stage1_batch_id":"msgbatch_01DbiymDmubkPpYvdbAu5a7V","stage2_batch_id":"msgbatch_012TbrWvMRH129T7PQ4SmvrJ","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2007,\n      \"finding\": \"P. falciparum eIF4E (PF3D7_0315100) was purified as a recombinant protein and demonstrated to have canonical mRNA 5' cap binding activity; it was used to affinity-purify capped mRNAs from total parasite RNA, establishing its role as a functional cap-binding protein in P. falciparum.\",\n      \"method\": \"Recombinant protein purification and cap-binding affinity assay (in vitro biochemical assay)\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — direct in vitro biochemical demonstration of cap-binding activity, single lab, single method\",\n      \"pmids\": [\"17692399\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"P. falciparum eIF4E (PF3D7_0315100) interacts with eIF4G, and is a component of the P. falciparum eIF4F translation initiation complex together with eIF4A and eIF4G; eIF4G contains binding sites for eIF4E and also interacts with PABP.\",\n      \"method\": \"Protein interaction assay (demonstrated interaction of PfeIF4G with PfeIF4E); bioinformatics/molecular modeling for structural characterization\",\n      \"journal\": \"Parasitology international\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single interaction assay with limited methodological detail in abstract\",\n      \"pmids\": [\"19751846\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"P. falciparum eIF4E (PF3D7_0315100) and eIF4A co-localize predominantly in the cytoplasm of asexual intraerythrocytic stages; co-addition of dsRNA targeting both eIF4E and eIF4A resulted in ~67% inhibition of parasite growth, establishing both as critical for parasite proliferation.\",\n      \"method\": \"Immunofluorescence assay for co-localization; dsRNA-mediated knockdown with parasite growth inhibition assay\",\n      \"journal\": \"Communicative & integrative biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, localization by IFA and combined dsRNA knockdown without individual gene-specific growth data for eIF4E alone\",\n      \"pmids\": [\"21331256\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In P. berghei gametocytes, eIF4E is a component of a DOZI/CITH-containing messenger ribonucleoprotein (mRNP) complex that stores translationally silent mRNAs; this mRNP integrates eIF4E and poly(A)-binding protein but excludes P-body RNA degradation factors and translation-initiation-promoting eIF4G, placing eIF4E in a repressive mRNP distinct from the canonical eIF4F complex.\",\n      \"method\": \"Affinity purification coupled with mass spectrometry (AP-MS) from P. berghei gametocytes\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — AP-MS identification in a defined complex, with functional validation via gene deletion mutants of complex components in the same study\",\n      \"pmids\": [\"20169188\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"P. falciparum eIF4E (PF3D7_0315100) physically interacts with the DEAD-box RNA helicase DOZI (PfDZ50), primarily through DOZI's domain 1; addition of exogenous eIF4E restored ~70% of translation that was inhibited by PfDZ50 in an in vitro translation assay, indicating eIF4E functionally counteracts DOZI-mediated translational repression.\",\n      \"method\": \"Co-immunoprecipitation/pulldown interaction assay; in vitro translation assay with recombinant proteins; immunofluorescence assay for localization\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct protein interaction mapped to a domain plus functional rescue in in vitro translation assay, single lab\",\n      \"pmids\": [\"23562722\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Native P. falciparum eIF4E (PF3D7_0315100) was the most reproducibly enriched protein in a 5' cap affinity pull-down from asexual-stage parasites, confirming its role as the primary cap-binding protein in vivo; eIF4A and eIF4G were also detected but with low reproducibility, suggesting a loose or transient eIF4F complex association.\",\n      \"method\": \"5' cap affinity matrix enrichment of native proteins from asexual-stage parasite lysates followed by proteomic (mass spectrometry) analysis\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — native protein affinity enrichment with proteomic identification, single lab, confirms cap-binding function in vivo\",\n      \"pmids\": [\"34890716\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"P. falciparum eIF4E (PF3D7_0315100) was used as a functional tool to enrich full-length 5'-capped mRNAs from ring, trophozoite, and schizont stages via cap-binding affinity, enabling transcriptome-wide mapping of 5' capped transcript ends, which confirmed eIF4E's cap-binding function across intraerythrocytic developmental stages.\",\n      \"method\": \"Cap-affinity enrichment of full-length cDNA coupled with next-generation sequencing (transcriptomic method)\",\n      \"journal\": \"PeerJ\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — eIF4E used instrumentally as a reagent; cap-binding activity is inferred from enrichment rather than directly assayed, single lab\",\n      \"pmids\": [\"34527439\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"P. falciparum eIF4E (PF3D7_0315100) is the primary mRNA 5' cap-binding protein of the parasite, functioning as the cap-recognition subunit of the eIF4F translation initiation complex (with eIF4A and eIF4G) in the cytoplasm of asexual stages, and additionally participating in a translationally repressive DOZI/CITH-containing mRNP in gametocytes where it is sequestered away from eIF4G; its interaction with the RNA helicase DOZI can be functionally overcome by exogenous eIF4E to restore translation in vitro.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PF3D7_0315100 (eIF4E) is the primary mRNA 5' cap-binding protein of Plasmodium falciparum and serves as the cap-recognition subunit that couples 5'-capped transcripts to the translation machinery [#0, #5]. Recombinant eIF4E possesses canonical cap-binding activity and can be used to affinity-purify capped mRNAs from parasite RNA [#0], and native eIF4E is the most reproducibly enriched protein in 5' cap affinity pull-downs from asexual-stage parasites, confirming this role in vivo [#5]. In asexual intraerythrocytic stages, eIF4E interacts with eIF4G and, together with eIF4A, forms the eIF4F translation initiation complex, though the low reproducibility of eIF4A/eIF4G co-enrichment indicates a loose or transient association [#1, #5]; eIF4E and eIF4A co-localize predominantly in the cytoplasm and are together critical for parasite proliferation [#2]. Beyond canonical initiation, eIF4E participates in a translationally repressive program: in P. berghei gametocytes it is a component of a DOZI/CITH-containing mRNP that stores translationally silent mRNAs, incorporating poly(A)-binding protein but excluding eIF4G [#3], and in P. falciparum eIF4E physically interacts with the DEAD-box helicase DOZI (PfDZ50) through DOZI's domain 1, an interaction that can be functionally overcome by exogenous eIF4E to restore translation in vitro [#4]. No structural model, regulatory phosphorylation, or individual gene-specific loss-of-function phenotype for eIF4E has been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Establishing whether the parasite encodes a functional cap-binding protein was the first step in defining how P. falciparum recognizes mRNA for translation; recombinant eIF4E was shown to bind the 5' cap and to affinity-purify capped mRNAs.\",\n      \"evidence\": \"Recombinant protein purification and in vitro cap-binding affinity assay\",\n      \"pmids\": [\"17692399\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, single method\", \"No in vivo confirmation at this stage\", \"Cap-binding affinity/specificity not quantified against variant cap structures\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"To place eIF4E in the initiation machinery, its interaction with eIF4G was tested, positioning eIF4E as a subunit of the parasite eIF4F complex alongside eIF4A and eIF4G.\",\n      \"evidence\": \"Protein interaction assay with bioinformatic/structural modeling\",\n      \"pmids\": [\"19751846\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single interaction assay with limited methodological detail\", \"Binding stoichiometry and affinity not defined\", \"No reciprocal in vivo validation\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"The subcellular location and functional importance of eIF4E were probed to link cap-binding to parasite growth; eIF4E and eIF4A localize to the cytoplasm and combined knockdown strongly inhibits proliferation.\",\n      \"evidence\": \"Immunofluorescence co-localization plus combined dsRNA knockdown and growth inhibition assay\",\n      \"pmids\": [\"21331256\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No eIF4E-alone knockdown data — growth effect is from combined eIF4E/eIF4A dsRNA\", \"Off-target effects of dsRNA not excluded\", \"Cytoplasmic localization not resolved to specific compartments\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Whether eIF4E functions only in active initiation or also in translational repression was addressed by characterizing gametocyte mRNP complexes; eIF4E was found in a DOZI/CITH mRNP that stores silent mRNAs and excludes eIF4G.\",\n      \"evidence\": \"Affinity purification coupled with mass spectrometry from P. berghei gametocytes, with gene-deletion validation of complex components\",\n      \"pmids\": [\"20169188\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Shown in P. berghei, not P. falciparum\", \"eIF4E's specific role within the repressive mRNP not dissected by its own deletion\", \"Mechanism of eIF4E partitioning between eIF4F and the mRNP unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"To test whether the eIF4E–DOZI association is direct and functionally consequential, the interaction was mapped and reconstituted; eIF4E binds DOZI domain 1 and exogenous eIF4E relieves DOZI-mediated translational repression in vitro.\",\n      \"evidence\": \"Co-immunoprecipitation/pulldown, domain mapping, in vitro translation rescue assay, and immunofluorescence\",\n      \"pmids\": [\"23562722\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vitro rescue may not reflect in vivo stoichiometry\", \"Single lab\", \"How the eIF4E–DOZI equilibrium is regulated in gametocytes not established\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Whether eIF4E is the principal cap-binding protein in intact parasites, versus one of several, was confirmed by native cap-affinity proteomics; eIF4E was the most reproducibly enriched cap-binder, while eIF4A/eIF4G enriched only weakly.\",\n      \"evidence\": \"5' cap affinity enrichment of native proteins from asexual-stage lysates with mass spectrometry\",\n      \"pmids\": [\"34890716\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Loose/transient eIF4F assembly inferred, not directly demonstrated\", \"Stage-specific composition of cap-binding complexes not resolved\", \"No quantitative comparison across developmental stages\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"eIF4E's cap-binding activity was exploited as a reagent to map 5'-capped transcript ends across asexual stages, reinforcing that its cap recognition operates throughout intraerythrocytic development.\",\n      \"evidence\": \"Cap-affinity enrichment of full-length cDNA coupled with next-generation sequencing\",\n      \"pmids\": [\"34527439\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Cap-binding inferred from enrichment rather than directly assayed\", \"Used instrumentally, not to test eIF4E biology per se\", \"No functional readout for eIF4E itself\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How eIF4E is partitioned between the active eIF4F complex and the repressive DOZI/CITH mRNP, and what regulates this switch during the transition to gametocyte stages, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of eIF4E or its complexes\", \"No eIF4E-specific conditional loss-of-function phenotype\", \"Regulatory modifications controlling eIF4E partitioning unknown\"],\n      \"attribution\": []\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0000339\", \"supporting_discovery_ids\": [0, 5, 6]},\n      {\"term_id\": \"GO:0003743\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005737\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0006413\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0017148\", \"supporting_discovery_ids\": [3, 4]}\n    ],\n    \"complexes\": [\n      \"eIF4F translation initiation complex (with eIF4A and eIF4G)\",\n      \"DOZI/CITH-containing translationally repressive mRNP (P. berghei gametocytes)\"\n    ],\n    \"partners\": [\n      \"eIF4G\",\n      \"eIF4A\",\n      \"DOZI (PfDZ50) DEAD-box RNA helicase\",\n      \"poly(A)-binding protein (within DOZI/CITH mRNP)\"\n    ],\n    \"other_free_text\": [\n      \"Most reproducibly enriched cap-binding protein in native asexual-stage cap-affinity proteomics [#5]\",\n      \"eIF4A/eIF4G co-enrich weakly, indicating loose or transient eIF4F association [#5]\",\n      \"Exogenous eIF4E relieves DOZI-mediated translational repression in vitro (~70% restoration) [#4]\",\n      \"Combined eIF4E/eIF4A dsRNA knockdown inhibits parasite growth ~67%; no eIF4E-alone phenotype available [#2]\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_0315100","name":null,"product":"eukaryotic translation initiation factor 4E","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_0412800","name":null,"product":"eukaryotic translation initiation factor 4E, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_0827000","name":null,"product":"eukaryotic translation initiation factor 4E, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"eIF4E","evaluation":null}