Existing Annotations Review

Core Functions

EDF1 is an evolutionarily conserved transcriptional coactivator that bridges gene-specific transcription factors (nuclear receptors NR5A1, NR1H3, PPARg; bZIP factors ATF1, ATF2, CREB1) to the TATA-binding protein (TBP) component of the general transcription machinery [PMID:10567391, PMID:12040021].

Molecular Function:

transcription coactivator activity

EDF1 contains an IQ motif that mediates calcium- and phosphorylation-dependent binding to calmodulin. This regulates eNOS activity in endothelial cells by sequestering calmodulin in the cytoplasm [PMID:10816571, PMID:15112053].

Molecular Function:

calmodulin binding

Direct binding to TBP and the TFIID complex is central to EDF1's bridging function between activators and the basal transcription machinery [PMID:10567391, PMID:12040021].

Molecular Function:

TFIID-class transcription factor complex binding

EDF1 was identified as an mRNA-binding protein in two independent proteomics studies [PMID:22658674, PMID:22681889]. This is consistent with its role at collided ribosomes where structural studies show it contacts mRNA.

Molecular Function:

RNA binding

References

GO_REF:0000033

Annotation inferences using phylogenetic trees

GO_REF:0000043

Gene Ontology annotation based on UniProtKB/Swiss-Prot keyword mapping

GO_REF:0000044

Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular Location vocabulary mapping

GO_REF:0000052

Gene Ontology annotation based on curation of immunofluorescence data

GO_REF:0000120

Combined Automated Annotation using Multiple IEA Methods

PMID:10567391

The role of human MBF1 as a transcriptional coactivator.

PMID:12040021

Multiprotein bridging factor-1 (MBF-1) is a cofactor for nuclear receptors that regulate lipid metabolism.

PMID:21217774

RAC3 is a pro-migratory co-activator of ERα.

PMID:22658674

Insights into RNA biology from an atlas of mammalian mRNA-binding proteins.

PMID:22681889

The mRNA-bound proteome and its global occupancy profile on protein-coding transcripts.

PMID:24008843

Structure homology and interaction redundancy for discovering virus-host protein interactions.

PMID:25416956

A proteome-scale map of the human interactome network.

PMID:31527615

The RNA-mediated estrogen receptor α interactome of hormone-dependent human breast cancer cell nuclei.

PMID:32814053

Interactome Mapping Provides a Network of Neurodegenerative Disease Proteins and Uncovers Widespread Protein Aggregation in Affected Brains.

PMID:35156780

CFTR interactome mapping using the mammalian membrane two-hybrid high-throughput screening system.

PMID:36012204

Differential CFTR-Interactome Proximity Labeling Procedures Identify Enrichment in Multiple SLC Transporters.

PMID:8164657

Mediators of activation of fushi tarazu gene transcription by BmFTZ-F1.

file:human/EDF1/EDF1-deep-research-openai.md

Deep research on EDF1 function

📚 Additional Documentation

Deep Research Openai

(EDF1-deep-research-openai.md)

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gene_id: EDF1
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gene_info: Name=EDF1;
organism_full: Homo sapiens (Human).
protein_family: Not specified in UniProt
protein_domains: Cro/C1-type_HTH. (IPR001387); Lambda_DNA-bd_dom_sf. (IPR010982);
MBF1_N. (IPR013729); HTH_3 (PF01381); MBF1 (PF08523)
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Question

Gene Research for Functional Annotation

⚠️ CRITICAL: Gene/Protein Identification Context

BEFORE YOU BEGIN RESEARCH: You MUST verify you are researching the CORRECT gene/protein. Gene symbols can be ambiguous, especially for less well-characterized genes from non-model organisms.

Target Gene/Protein Identity (from UniProt):

UniProt Accession: O60869
Protein Description: RecName: Full=Endothelial differentiation-related factor 1; Short=EDF-1; AltName: Full=Multiprotein-bridging factor 1; Short=MBF1;
Gene Information: Name=EDF1;
Organism (full): Homo sapiens (Human).
Protein Family: Not specified in UniProt
Key Domains: Cro/C1-type_HTH. (IPR001387); Lambda_DNA-bd_dom_sf. (IPR010982); MBF1_N. (IPR013729); HTH_3 (PF01381); MBF1 (PF08523)

MANDATORY VERIFICATION STEPS:

Check if the gene symbol "EDF1" matches the protein description above
Verify the organism is correct: Homo sapiens (Human).
Check if protein family/domains align with what you find in literature
If you find literature for a DIFFERENT gene with the same or similar symbol, STOP

If Gene Symbol is Ambiguous or You Cannot Find Relevant Literature:

DO NOT PROCEED WITH RESEARCH ON A DIFFERENT GENE. Instead:
- State clearly: "The gene symbol 'EDF1' is ambiguous or literature is limited for this specific protein"
- Explain what you found (e.g., "Found extensive literature on a different gene with the same symbol in a different organism")
- Describe the protein based ONLY on the UniProt information provided above
- Suggest that the protein function can be inferred from domain/family information

Research Target:

Please provide a comprehensive research report on the gene EDF1 (gene ID: EDF1, UniProt: O60869) in human.

The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.

You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.

We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.

We are interested in where in or outside the cell the gene product carries out its function.

We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.

Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.

Output

Gene Identity and Conservation

Endothelial differentiation-related factor 1 (EDF1), also known as Multiprotein Bridging Factor-1 (MBF1), is a small (~16 kDa) protein encoded by the human EDF1 gene (UniProt O60869). It was initially identified in the context of endothelial cell differentiation and is highly conserved across species (pmc.ncbi.nlm.nih.gov). The amino acid sequence of EDF1/MBF1 shows substantial conservation from yeast to humans (e.g. ~62% identity between human and silkworm MBF1) (pmc.ncbi.nlm.nih.gov), reflecting a fundamental role in cell physiology. EDF1 is classified as a transcriptional co-factor: its defining feature is the ability to form a bridge between gene-specific transcription factors and the basal transcription machinery (pmc.ncbi.nlm.nih.gov). This bridging activity is the basis for its alternate name “multiprotein bridging factor”, emphasizing its role in connecting multiple protein partners in gene regulation. EDF1 is also sometimes designated CFAP280 (cilia/flagella-associated protein 280) in databases, though its primary known functions are not cilia-specific. Its conservation and ubiquitous presence suggest an essential regulatory function maintained throughout eukaryotic evolution (pmc.ncbi.nlm.nih.gov).

Protein Structure and Domains

EDF1 is a relatively small protein composed largely of alpha-helical domains. It contains an N-terminal MBF1 domain and a C-terminal helix-turn-helix (HTH) motif characteristic of Cro/C1-type DNA-binding domains (IPR001387). Notably, EDF1 harbors an IQ motif (a short calmodulin-binding sequence), which overlaps with part of the MBF1 domain (www.abcam.com). This IQ motif allows EDF1 to bind the calcium sensor protein calmodulin (CaM). The C-terminal HTH domain (IPR013729, PF01381) is conserved in MBF1 proteins and enables DNA or nucleic acid binding in some contexts (elifesciences.org) (elifesciences.org). Indeed, structural analyses indicate that EDF1’s HTH and adjacent helices form a bundle that can interact with RNA and ribosomal components (as discussed below) (elifesciences.org) (elifesciences.org). In summary, EDF1’s domain architecture equips it with a bifunctional capacity: an N-terminal region for protein–protein interactions (with transcription factors and CaM) and a C-terminal HTH for nucleic acid or protein binding in larger complexes.

Expression and Subcellular Localization

The EDF1 gene is widely expressed in human tissues. RNA profiling data show ubiquitous expression, with especially high levels in the digestive tract (e.g. duodenum and small intestine) and consistent expression in many other tissues (www.ncbi.nlm.nih.gov). At the cellular level, EDF1 is found in both the cytoplasm and the nucleus. Under basal conditions, a significant fraction of EDF1 resides in the cytosol, often bound to calmodulin. However, upon certain stimuli EDF1 relocalizes to the nucleus (www.genecards.org). Notably, protein kinase A (PKA) activation (e.g. via forskolin treatment, which raises cAMP) causes EDF1 to be phosphorylated and accumulate in the nucleus (pubmed.ncbi.nlm.nih.gov). Phorbol ester (TPA) treatment has a similar effect, as does the binding of EDF1 to some of its partner transcription factors like NR5A1 (steroidogenic factor-1) that localize to the nucleus (www.genecards.org). In contrast, in quiescent cells EDF1 can be largely cytosolic. This dynamic localization indicates regulated shuttling: EDF1 acts as a cytosolic sensor and sequestering protein under some conditions, and as a nuclear coactivator under others. Phosphorylation by PKA modulates this balance – unphosphorylated EDF1 tends to stay in the cytoplasm bound to CaM, whereas phosphorylated EDF1 releases CaM and enters the nucleus to engage in transcriptional regulation (pubmed.ncbi.nlm.nih.gov).

Role as a Transcriptional Coactivator

In the nucleus, EDF1/MBF1 serves as a transcriptional coactivator, bridging between sequence-specific transcription activators and the general transcription machinery. It was first described in Drosophila as a cofactor for the FTZ-F1 transcription factor (an orphan nuclear receptor), facilitating FTZ-F1’s activation of target genes (academic.oup.com). This bridging function is conserved in humans: EDF1 has been shown to interact with the TATA-box binding protein (TBP), a core component of the pre-initiation complex, while simultaneously binding gene-specific activators (www.ncbi.nlm.nih.gov). By physically linking activator and TBP, EDF1 helps recruit or stabilize the transcriptional machinery at target promoters. Several studies have identified specific factors enhanced by EDF1. For example, EDF1 augments the DNA-binding and transactivation activity of certain bZIP family transcription factors like ATF1, ATF2, and CREB1 (www.genecards.org). It also acts as a coactivator for nuclear receptors: it was shown to stimulate the transcriptional activity of steroidogenic factor-1 (NR5A1) and the ligand-dependent receptors LXRα (NR1H3) and PPARγ (NR1C3) (pharos.nih.gov). These nuclear receptors regulate genes in steroid hormone biosynthesis and lipid metabolism; accordingly, an early study demonstrated that MBF1 enhances the activity of multiple lipid-metabolism regulators in this class (pubmed.ncbi.nlm.nih.gov) (pharos.nih.gov). Unlike classical coactivators such as p300/CBP, EDF1 does not have enzymatic histone acetyltransferase activity, but instead acts as an architectural tether – an adapter that brings together activator, TBP, and possibly other components. This function is essential for certain genes: for instance, in vitro experiments showed that without MBF1, an activator’s ability to stimulate a reporter gene via TBP was severely impaired (www.microbiologyresearch.org) (pmc.ncbi.nlm.nih.gov). In summary, EDF1’s primary function in the nucleus is to facilitate transcription initiation by bridging specific transcription factors to the general machinery, thereby boosting target gene expression.

Calmodulin Binding and Endothelial Cell Function

One distinctive feature of EDF1 is its interaction with calmodulin (CaM), a calcium-binding messenger protein. EDF1’s IQ motif allows it to bind CaM in a calcium-dependent manner, effectively sequestering CaM when EDF1 is in the cytoplasm (pubmed.ncbi.nlm.nih.gov). This has direct implications for endothelial cell function. In vascular endothelial cells, CaM is a crucial cofactor for endothelial nitric oxide synthase (eNOS), the enzyme that produces nitric oxide (NO). EDF1 can negatively regulate eNOS activity by competing for CaM. Under resting conditions, EDF1-bound calmodulin is not available to fully activate eNOS, thereby keeping NO release in check (pubmed.ncbi.nlm.nih.gov). Experimental studies support this model: silencing EDF1 in human endothelial cells leads to increased free CaM and enhanced NO production (pubmed.ncbi.nlm.nih.gov). Bolognese et al. (2010) reported that endothelial cells with shRNA-mediated EDF1 knockdown showed significantly higher NO output, which could be reversed by a CaM inhibitor, indicating that the effect was indeed through freed calmodulin activating eNOS (pubmed.ncbi.nlm.nih.gov). Interestingly, the loss of EDF1 in these cells also accelerated their organization into capillary-like networks (a sign of differentiation) and slowed their proliferation (pubmed.ncbi.nlm.nih.gov). Consistent with this, EDF1 levels are lower in quiescent or senescent endothelial cells and highest in actively proliferating endothelial cells (pubmed.ncbi.nlm.nih.gov). Thus, EDF1 appears to restrain full endothelial differentiation while promoting proliferation, in part by limiting NO signaling. Upon pro-angiogenic stimulation, this restraint is relieved: for example, vascular endothelial growth factor (VEGF) triggers a rise in endothelial Ca²⁺ that causes CaM to dissociate from EDF1 (pubmed.ncbi.nlm.nih.gov). VEGF treatment does not change total EDF1 levels, but it causes EDF1 to release CaM, which then binds to eNOS, coinciding with a burst of NO production (pubmed.ncbi.nlm.nih.gov). In parallel, as CaM is released and calcium levels rise, EDF1 can translocate to the nucleus (especially if PKA or other pathways phosphorylate it) (pubmed.ncbi.nlm.nih.gov). In the nucleus, it may then coactivate transcription of genes involved in angiogenesis or cell growth. In summary, EDF1 serves a dual role in endothelial cells: in the cytosol it is a CaM-binding protein that tonically represses NO synthesis and differentiation, and in the nucleus it can act as a coactivator for genes that promote endothelial cell proliferation and angiogenic responses (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov).

Involvement in Cardiomyocyte Hypertrophy

Beyond the endothelium, EDF1/MBF1 plays a role in the heart, particularly in the context of cardiac hypertrophy. Cardiac (ventricular) hypertrophy is an adaptive response to stress (e.g. hypertension or hormonal stimulation) characterized by enlarged cardiomyocyte size and reactivation of fetal cardiac genes. A study by Franco et al. found that MBF1 expression is upregulated during cardiomyocyte hypertrophy in vitro and in animal models (pubmed.ncbi.nlm.nih.gov). Cultured heart cells stimulated with phenylephrine (a hypertrophic agonist) showed increased MBF1 levels, and similarly, mice subjected to hypertrophic stimuli (angiotensin II infusion or pressure overload by aortic banding) had elevated cardiac MBF1 protein (pubmed.ncbi.nlm.nih.gov). Functionally, MBF1 is required for the hypertrophic gene program: using antisense oligonucleotides to knock down MBF1 markedly blocked the hypertrophic growth of cardiomyocytes in response to phenylephrine (pubmed.ncbi.nlm.nih.gov). Conversely, overexpression of MBF1 enhanced the activation of hypertrophy-associated genes such as atrial natriuretic peptide (ANP) under hormonal stimulation (pubmed.ncbi.nlm.nih.gov). Mechanistically, MBF1 was found to cooperate with the AP-1 transcription factor c-Jun in this process (pubmed.ncbi.nlm.nih.gov). c-Jun (part of the AP-1 complex) is known to drive expression of genes during hypertrophy; MBF1 likely bridges c-Jun to the basal machinery, boosting transcription of genes like ANP. These findings indicate that EDF1/MBF1 is a key co-factor in hormone-induced cardiomyocyte hypertrophy, linking neurohumoral signals to the genomic response in heart muscle. This aligns with its general role as a coactivator: in cardiomyocytes, it amplifies the effect of pro-hypertrophic transcription factors. Its inducibility and necessity in hypertrophy suggest that EDF1 could be a potential mediator of pathological cardiac remodeling. Indeed, one could speculate that targeting EDF1-MBF1 interactions might modulate the hypertrophic response, although no direct therapies exist yet.

Interaction with Metabolic Regulators

EDF1’s coactivator function also extends to metabolic regulation. As noted above, it can bind and stimulate nuclear receptors such as PPARγ and LXRα (pharos.nih.gov), which are master regulators of lipid metabolism and storage. A 2002 study in Molecular Endocrinology demonstrated that human MBF1 enhances the transcriptional activity of several non-steroid nuclear receptors involved in cholesterol and fatty acid metabolism (pubmed.ncbi.nlm.nih.gov). For instance, LXRα controls genes in cholesterol efflux and transport, while PPARγ activates adipogenic genes; MBF1’s presence boosts the expression of their target genes. In practical terms, EDF1 might influence processes like adipocyte differentiation or liver lipid homeostasis via these pathways. Additionally, EDF1 was shown to enhance the activity of SF-1 (NR5A1) (pharos.nih.gov), a nuclear receptor that regulates steroid hormone biosynthesis and certain aspects of lipid metabolism in endocrine tissues. Thus, EDF1 serves as a common co-factor linking diverse metabolic transcription factors to effective transcription. However, the physiological impact of EDF1 on metabolism in vivo remains to be fully elucidated. Given its ubiquitous expression, any metabolic phenotype of EDF1 dysfunction might be subtle or context-dependent. Some large-scale studies have annotated EDF1 with Gene Ontology terms like “lipid metabolism,” but direct experimental evidence (such as metabolic profiling of an EDF1 knockout) has not been widely reported. Nonetheless, the molecular interactions suggest that EDF1 could modulate metabolic gene networks in tissues like adipose, liver, and steroidogenic organs, by ensuring robust transcriptional activation by key metabolic regulators (pharos.nih.gov).

Role in Ribosome Quality Control and Stress Response

One of the most exciting recent developments (2020 onwards) in understanding EDF1 is the discovery of its role in ribosome-associated quality control and the integrated stress response. While historically known as a transcription factor coactivator, EDF1 has now been implicated in managing stalled ribosomes and maintaining translational fidelity. Studies in yeast and human cells found that EDF1 (and its yeast homolog Mbf1) is recruited to collided ribosomes – situations where multiple ribosomes jam on an mRNA due to a translational stall (elifesciences.org). Cryo-electron microscopy mapping shows EDF1/Mbf1 binding at the interface of two collided ribosomes, near the mRNA entry channel of the 40S subunit (elifesciences.org) (elifesciences.org). In this position, EDF1 acts as a sensor and mediator of the collision response. Sinha et al. (2020) showed that EDF1 recruits the translational repressors GIGYF2 and eIF4E2 (also known as the 4EHP–GIGYF2 complex) to the stalled ribosome complex (elifesciences.org). By bringing in this complex, EDF1 helps initiate a negative-feedback mechanism that prevents new ribosomes from loading onto the defective mRNA (elifesciences.org). In other words, EDF1 helps shut down translation initiation on messages that are broken or stalled, which is part of a process called No-Go Decay/Ribosome Quality Control (RQC). Consistently, cells lacking EDF1/Mbf1 show aberrant translation re-initiation and frameshifting on problematic mRNAs (elifesciences.org) (elifesciences.org), indicating that EDF1 normally prevents such errors by stabilizing the stalled ribosome in a conformation that halts translation and signals for rescue. Indeed, EDF1/Mbf1 binding to collided ribosomes was found to physically block the mRNA path and displace certain ribosomal proteins, thereby acting as a “clamp” to stop ribosomes from proceeding on a damaged template (elifesciences.org) (elifesciences.org).

Beyond halting local translation, EDF1 activates cellular stress responses stemming from ribosome collisions. Recent work has shown that Mbf1 is required to fully activate the Integrated Stress Response (ISR) in yeast and mammals (www.sciencedirect.com). The ISR is a conserved pathway where the kinase GCN2 (in yeast) or analogous eIF2α kinases in mammals detect translation stress and phosphorylate eIF2α, attenuating global protein synthesis and inducing stress-responsive genes. In yeast, deletion of MBF1 leads to blunted activation of GCN2: cells lacking Mbf1 have significantly lower eIF2α phosphorylation under stress despite the presence of collided ribosomes (www.sciencedirect.com) (www.sciencedirect.com). Without Mbf1, the downstream induction of GCN4 (a transcription factor produced upon eIF2α phosphorylation) is impaired, and the entire GCN4-dependent gene regulon is under-expressed during stress (www.sciencedirect.com) (www.sciencedirect.com). These defects resemble the phenotype of a GCN2 knockout, suggesting Mbf1 is an upstream activator of GCN2. Mechanistically, Mbf1 appears to cooperate with the known ribosome collision sensor GCN1 to stimulate GCN2 when collisions occur (www.sciencedirect.com) (www.sciencedirect.com). In fact, Wang et al. (2018) and Tesina et al. (2020) earlier reported that Mbf1 and the ribosomal protein Asc1/RACK1 act together to prevent +1 frameshifting and to promote appropriate stalling signals for GCN2 (elifesciences.org) (elifesciences.org). Building on that, a 2024 study in Molecular Cell concluded that Mbf1/EDF1 is a “core” factor for collision-induced stress signaling: it links the mechanical event of ribosome stalling to the biochemical activation of the ISR kinase (www.sciencedirect.com). Notably, that study found Mbf1’s traditional transcription coactivator role is not required for the stress response – when GCN4 was expressed constitutively (bypassing the need for translation control), Mbf1 deletion no longer affected stress gene induction (www.sciencedirect.com). Instead, Mbf1’s critical function is at the ribosome: facilitating robust GCN2 activation and subsequent eIF2α phosphorylation during stress (www.sciencedirect.com) (www.sciencedirect.com). Structurally, the N-terminal region of EDF1/Mbf1 that binds the collided ribosome was shown to be essential for this signaling, as mutations that disrupt ribosome binding also compromise GCN2 activation (www.sciencedirect.com). Thus, EDF1 serves as a molecular linchpin in the ribosome surveillance pathway – it not only halts aberrant protein synthesis but also triggers cellular stress remediation programs (both translational arrest via eIF2α phosphorylation and an “immediate early” transcriptional response to stress) (elifesciences.org). This dual action ensures proteostasis is maintained when cells encounter translation errors or damage.

Biological and Clinical Significance

Through its multiple roles, EDF1 integrates into several critical biological pathways. In the nucleus it participates in gene expression programs for development, metabolism, and stress, while in the cytosol it modulates signaling pathways like Ca²⁺/calmodulin–NO signaling and ribosome-associated stress signaling. The pleiotropic effects of EDF1 are increasingly being understood in specific physiological contexts:

Vascular function: By regulating nitric oxide production in endothelial cells, EDF1 can influence blood vessel dilation, angiogenesis, and vascular remodeling. Knockdown experiments suggest that lowering EDF1 raises NO levels and promotes endothelial differentiation, which could be beneficial for repairing blood vessels (pubmed.ncbi.nlm.nih.gov). On the other hand, excessive NO can be deleterious; thus, EDF1 may act as a brake to prevent unwarranted NO release. Its expression is required for proper endothelial proliferation and organization (pubmed.ncbi.nlm.nih.gov), implicating EDF1 in maintaining vascular integrity. These findings hint that EDF1 could play a role in cardiovascular diseases: for instance, in atherosclerosis or thrombosis, where endothelial dysfunction is key, the balance of EDF1 and NO might be a factor (though direct clinical correlations remain to be investigated).
Cardiac hypertrophy: EDF1 (MBF1) is clearly induced in hypertrophic hearts (pubmed.ncbi.nlm.nih.gov), and it appears necessary for the full hypertrophic gene expression response to neurohormonal stimuli (pubmed.ncbi.nlm.nih.gov). This makes it a potential marker or mediator in cardiac stress. Some have proposed it as part of the network controlling fetal gene reactivation in heart failure. While not yet a clinical target, EDF1’s cooperation with c-Jun/AP-1 in cardiomyocytes links it to pathways (like MAPK and adrenergic signaling) known to drive heart disease (pubmed.ncbi.nlm.nih.gov).
Metabolism: Through nuclear receptors like PPARγ and LXRα, EDF1 could influence metabolic syndrome components. For example, PPARγ is a drug target in type 2 diabetes (thiazolidinediones activate PPARγ); if EDF1 amplifies PPARγ activity, variations in EDF1 levels might affect adipogenesis or insulin sensitivity. Similarly, LXRα helps clear cholesterol; EDF1 might enhance LXR-driven anti-atherogenic genes (ABCA1, etc.). More research is needed to connect EDF1 with metabolic phenotypes, but its coactivator role places it at key nodes of metabolic regulation (pharos.nih.gov).
Protein homeostasis and neurodegeneration: The newly discovered role of EDF1 in ribosomal quality control may have implications for diseases caused by protein misfolding or translational stress. For instance, neurodegenerative diseases often involve stress granule formation and ISR activation. Indeed, mutations in tRNA or ribosome recycling factors that elevate ribosome collisions can lead to neurological disorders (www.sciencedirect.com). EDF1’s action in preventing frameshifts and activating rescue pathways suggests it might be protective in such settings. There is emerging evidence that if this system fails (e.g., in EDF1/MBF1 loss-of-function conditions), cells are less able to handle proteotoxic stress (www.sciencedirect.com) (www.sciencedirect.com). While no human diseases have yet been directly linked to mutations in EDF1, its categorization as “core ISR factor” (www.sciencedirect.com) raises the possibility that it could be a vulnerability factor in conditions from viral infection (where ISR is triggered) to cancer (tumors experience translation stress) – or conversely, a target to modulate these responses.
Viral interactions: Interestingly, one report indicates that HIV-1 Tat protein can downregulate EDF1 expression in endothelial cells (www.ncbi.nlm.nih.gov). Tat is known to cause vascular dysfunction in HIV patients; by suppressing EDF1, Tat might lead to excess NO release or aberrant endothelial behavior, contributing to HIV-related vascular pathology. This is a specific example of how pathogens might exploit EDF1’s pathway.

In summary, EDF1 is a multifaceted regulatory protein that links several major cellular processes – transcription, signal transduction, and translation surveillance. Its ability to interface with different partners (TBP at gene promoters, CaM and eNOS in the cytosol, ribosomes and GCN2 in the cytoplasm) is unique and underscores a unifying theme: EDF1 is a bridge between molecular systems. As one group of experts described, EDF1 “plays a central role in facilitating multiple steps” of cellular stress responses, acting upstream of key stress sensors and downstream of collision signals (elifesciences.org) (www.sciencedirect.com). Likewise, decades earlier it was recognized as an evolutionarily conserved coactivator essential for bridging certain activators to TBP (pmc.ncbi.nlm.nih.gov). These expert analyses convey that the current understanding of EDF1 is as a versatile adapter protein – one that cells utilize in different contexts to ensure proper communication between signaling pathways and gene expression outcomes. Ongoing research (particularly recent work in 2023–2024) is expanding our appreciation of EDF1, from a TBP tether to a guardian of the genome’s translational output (www.sciencedirect.com). This breadth of function makes EDF1 an intriguing subject for further study, as well as a potential node for therapeutic intervention in diseases where these pathways go awry.

References: Publications and data supporting this overview include: Takemaru et al., 1997 (PNAS) (pmc.ncbi.nlm.nih.gov); Bolognese et al., 2004 (J. Biol. Chem.) (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov); Bolognese et al., 2010 (Cardiovasc. Res.) (pubmed.ncbi.nlm.nih.gov) (pubmed.ncbi.nlm.nih.gov); Franco et al., 2003 (J. Biol. Chem.) (pubmed.ncbi.nlm.nih.gov); Liu et al., 2002 (Mol. Endocrinol.) (pubmed.ncbi.nlm.nih.gov); Sinha et al., 2020 (eLife) (elifesciences.org); and Efremov et al., 2024 (Molecular Cell) (www.sciencedirect.com) (www.sciencedirect.com), among others. These sources provide detailed experimental evidence for EDF1’s functions, interactions, and regulatory importance as discussed above.

Citations

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AnnotationURLCitation(end_index=826, start_index=702, title='Multiprotein bridging factor 1 (MBF1) is an evolutionarily conserved transcriptional coactivator that connects a regulatory factor and TATA element-binding\u2009protein - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC23807/#:~:text=showed%20that%20the%20MBF1%20sequence,mays')
AnnotationURLCitation(end_index=1226, start_index=1068, title='The plant MBF1 protein family: a bridge between stress and transcription - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC7094072/#:~:text=MBF1%20proteins%20and%20stress%20responses,MBF1%20belong%20to%20the%20bZIP')
AnnotationURLCitation(end_index=1812, start_index=1688, title='Multiprotein bridging factor 1 (MBF1) is an evolutionarily conserved transcriptional coactivator that connects a regulatory factor and TATA element-binding\u2009protein - PMC', type='url_citation', url='https://pmc.ncbi.nlm.nih.gov/articles/PMC23807/#:~:text=showed%20that%20the%20MBF1%20sequence,mays')
AnnotationURLCitation(end_index=2364, start_index=2204, title='EDF1 | Abcam', type='url_citation', url='https://www.abcam.com/en-us/targets/edf1/19619#:~:text=JavaScript%20is%20disabled%20in%20your,calmodulin%20binding%2C%20overlaps%20with%20the')
AnnotationURLCitation(end_index=2706, start_index=2579, title='EDF1 coordinates cellular responses to ribosome collisions | eLife', type='url_citation', url='https://elifesciences.org/articles/58828#:~:text=In%20these%20structures%2C%20the%20C,domain%20of%20both')
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AnnotationURLCitation(end_index=34650, start_index=34510, title='The effects of silencing EDF-1 in human endothelial cells - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/20185128/#:~:text=synthase,ultimately%20activates%20endothelial%20NO%20synthase')
AnnotationURLCitation(end_index=34808, start_index=34651, title='The effects of silencing EDF-1 in human endothelial cells - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/20185128/#:~:text=Conclusions%3A%20Since%20EDF,and%2C%20therefore%2C%20to%20vascular%20integrity')
AnnotationURLCitation(end_index=34976, start_index=34849, title='Multiprotein bridging factor 1 cooperates with c-Jun and is necessary for cardiac hypertrophy in vitro - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/12729799/#:~:text=angiotensin%20II%20treatment%20and%20aortic,MBF1')
AnnotationURLCitation(end_index=35170, start_index=35016, title='Multiprotein bridging factor-1 (MBF-1) is a cofactor for nuclear receptors that regulate lipid metabolism - PubMed', type='url_citation', url='https://pubmed.ncbi.nlm.nih.gov/12040021/#:~:text=Multiprotein%20bridging%20factor,are%20implicated%20in%20lipid%20metabolism')
AnnotationURLCitation(end_index=35308, start_index=35201, title='EDF1 coordinates cellular responses to ribosome collisions | eLife', type='url_citation', url='https://elifesciences.org/articles/58828#:~:text=collision%20interface,Our%20results')
AnnotationURLCitation(end_index=35528, start_index=35354, title='Multiprotein bridging factor 1 is required for robust activation of the integrated stress response on collided ribosomes - ScienceDirect', type='url_citation', url='https://www.sciencedirect.com/science/article/pii/S1097276524008694#:~:text=ribosomes%2C%20a%20known%20activator%20of,by%20acting%20as%20a%20direct')
AnnotationURLCitation(end_index=35720, start_index=35529, title='Multiprotein bridging factor 1 is required for robust activation of the integrated stress response on collided ribosomes - ScienceDirect', type='url_citation', url='https://www.sciencedirect.com/science/article/pii/S1097276524008694#:~:text=required%20for%20robust%20Gcn2%20activation,recruitment%20to%20collided%20ribosomes%20is')

📄 View Raw YAML

id: O60869
gene_symbol: EDF1
product_type: PROTEIN
taxon:
  id: NCBITaxon:9606
  label: Homo sapiens
description: 'EDF1 (Endothelial Differentiation-related Factor 1), also known as Multiprotein
  Bridging Factor 1 (MBF1), is a small (~16 kDa) evolutionarily conserved transcriptional
  coactivator. The protein acts as a molecular bridge between gene-specific transcription
  factors (including nuclear receptors NR5A1, NR1H3/LXRa, PPARg, and bZIP factors
  ATF1, ATF2, CREB1) and the TATA-binding protein (TBP) component of the general transcription
  machinery. EDF1 contains an N-terminal MBF1 domain with an IQ motif for calmodulin
  binding and a C-terminal helix-turn-helix (HTH) DNA-binding domain. Recent work
  has revealed a second major function: EDF1 is recruited to collided ribosomes where
  it coordinates ribosome-associated quality control (RQC) by recruiting the GIGYF2-eIF4E2
  translational repressor complex, and it is required for robust activation of the
  GCN2-mediated integrated stress response (ISR). In endothelial cells, cytoplasmic
  EDF1 sequesters calmodulin to regulate nitric oxide synthase activity. Subcellular
  localization is dynamic, with phosphorylation by PKA promoting nuclear accumulation.

  '
existing_annotations:
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: 'EDF1 localizes to both cytoplasm and nucleus, with nuclear localization
        enhanced by PKA-mediated phosphorylation or by co-expression with nuclear
        receptors like NR5A1 [PMID:10567391, PMID:15112053]. The IBA annotation is
        phylogenetically well-supported and consistent with experimental evidence.

        '
      action: ACCEPT
      reason: 'Nuclear localization is experimentally validated. Studies show that
        "coexpression of the nuclear protein Ad4BP/SF-1 with hMBF1 induced accumulation
        of hMBF1 in the nucleus" [PMID:10567391] and PKA activation promotes nuclear
        accumulation [PMID:15112053].

        '
      supported_by:
        - reference_id: PMID:10567391
          supporting_text: The role of human MBF1 as a transcriptional 
            coactivator.
        - reference_id: file:human/EDF1/EDF1-deep-research-openai.md
  - term:
      id: GO:0003677
      label: DNA binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: 'EDF1 contains a C-terminal Cro/C1-type helix-turn-helix domain (IPR001387),
        a known DNA-binding motif. However, experimental studies show that MBF1 does
        not directly bind DNA [PMID:8164657]. The HTH domain appears to function in
        ribosome binding rather than DNA binding.

        '
      action: MODIFY
      reason: 'The original MBF1 characterization paper explicitly states "Neither
        MBF1, MBF2, nor a combination of them binds to DNA" [PMID:8164657]. Although
        EDF1 has a DNA-binding domain fold, it functions as a bridging factor rather
        than a direct DNA binder. The HTH domain functions in ribosome binding during
        collision response.

        '
      proposed_replacement_terms:
        - id: GO:0000978
          label: RNA polymerase II cis-regulatory region sequence-specific DNA 
            binding transcription factor activity
      supported_by:
        - reference_id: PMID:8164657
          supporting_text: Mediators of activation of fushi tarazu gene 
            transcription by BmFTZ-F1.
  - term:
      id: GO:0005516
      label: calmodulin binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: 'EDF1 contains an IQ motif and experimentally binds calmodulin in a
        calcium- and phosphorylation- regulated manner [PMID:10816571, PMID:15112053].
        This is a well-established core function.

        '
      action: ACCEPT
      reason: 'Calmodulin binding is experimentally demonstrated. UniProt records
        that "Binding to calmodulin is regulated by calcium and phosphorylation of
        the IQ motif" based on PMID:10816571 and PMID:15112053. Multiple mutagenesis
        studies confirm specific residues involved in CALM binding.

        '
      supported_by:
        - reference_id: PMID:10816571
        - reference_id: PMID:15112053
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: 'Duplicate of IBA annotation. IEA mapping from UniProt subcellular
        location vocabulary. Nuclear localization is well supported experimentally.

        '
      action: ACCEPT
      reason: 'Nuclear localization is confirmed by multiple experimental studies
        showing EDF1 localizes to the nucleus upon activation by PKA or binding to
        nuclear receptors.

        '
      supported_by:
        - reference_id: PMID:10567391
          supporting_text: The role of human MBF1 as a transcriptional 
            coactivator.
  - term:
      id: GO:0005737
      label: cytoplasm
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: 'EDF1 localizes to cytoplasm where it sequesters calmodulin. IEA from
        UniProt subcellular location vocabulary, supported by experimental evidence.

        '
      action: ACCEPT
      reason: 'Cytoplasmic localization is experimentally validated, particularly
        in resting cells where EDF1 binds calmodulin. "While hMBF1 was detected in
        the cytoplasm by immunostaining" [PMID:10567391].

        '
      supported_by:
        - reference_id: PMID:10567391
          supporting_text: The role of human MBF1 as a transcriptional 
            coactivator.
  - term:
      id: GO:0030154
      label: cell differentiation
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: 'While EDF1 was named for its role in endothelial differentiation and
        affects differentiation phenotypes when knocked down, this term is very broad.
        The protein is involved in transcriptional regulation that affects differentiation
        rather than being a core differentiation factor.

        '
      action: KEEP_AS_NON_CORE
      reason: 'EDF1 silencing affects endothelial cell organization into capillary
        networks (differentiation) [PMID:20185128], but this is a downstream consequence
        of its calmodulin-sequestering and transcriptional coactivator functions rather
        than a direct role in differentiation machinery.

        '
      supported_by:
        - reference_id: PMID:20185128
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:12040021
    review:
      summary: 'This IPI evidence from PMID:12040021 documents binding to nuclear
        receptors (NR5A2, NR1H3, PPARg) and the TFIID complex. The term "protein binding"
        is too generic; more specific terms exist for these interactions.

        '
      action: MODIFY
      reason: '"protein binding" is uninformative for annotation purposes. The specific
        interactions documented are with nuclear receptors and transcription factor
        complexes, which have more specific GO terms. The coactivator function is
        already captured by GO:0003713.

        '
      proposed_replacement_terms:
        - id: GO:0001094
          label: TFIID-class transcription factor complex binding
        - id: GO:0035257
          label: nuclear hormone receptor binding
      supported_by:
        - reference_id: PMID:12040021
          supporting_text: Multiprotein bridging factor-1 (MBF-1) is a cofactor 
            for nuclear receptors that regulate lipid metabolism.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:21217774
    review:
      summary: 'PMID:21217774 is about RAC3 as an ERalpha coactivator. EDF1 appears
        in the phage display screen as an interactor (Supplemental Table 1), but this
        is a high-throughput study and EDF1 was not further characterized.

        '
      action: REMOVE
      reason: 'This paper focuses on RAC3, not EDF1. EDF1 was identified in a phage
        display screen but not validated or characterized. The "protein binding" term
        provides no functional insight.

        '
      supported_by:
        - reference_id: PMID:21217774
          supporting_text: RAC3 is a pro-migratory co-activator of ERα.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:24008843
    review:
      summary: 'PMID:24008843 describes computational prediction of virus-host interactions
        using structure homology. This is a high-throughput computational study, not
        experimental characterization of EDF1 interactions.

        '
      action: REMOVE
      reason: 'This paper describes computational predictions of virus-host interactions,
        not experimental evidence for EDF1 protein binding. The "protein binding"
        annotation provides no biological insight about EDF1 function.

        '
      supported_by:
        - reference_id: PMID:24008843
          supporting_text: Structure homology and interaction redundancy for 
            discovering virus-host protein interactions.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:25416956
    review:
      summary: 'PMID:25416956 is the HI-III human interactome map - a large-scale
        Y2H study. EDF1 interactions were identified in this systematic screen but
        the term "protein binding" is uninformative.

        '
      action: REMOVE
      reason: 'Large-scale interactome study providing no functional insight about
        specific EDF1 interactions. "protein binding" annotation without specifying
        binding partners is not informative for gene function annotation.

        '
      supported_by:
        - reference_id: PMID:25416956
          supporting_text: A proteome-scale map of the human interactome 
            network.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:31527615
    review:
      summary: 'PMID:31527615 examines the RNA-mediated estrogen receptor alpha interactome.
        EDF1 was identified in this proteomics study but the generic "protein binding"
        term provides no functional insight.

        '
      action: REMOVE
      reason: 'High-throughput proteomics study. Generic "protein binding" annotation
        is uninformative. If EDF1 specifically interacts with ESR1 in transcriptional
        regulation, more specific terms should be used.

        '
      supported_by:
        - reference_id: PMID:31527615
          supporting_text: The RNA-mediated estrogen receptor α interactome of 
            hormone-dependent human breast cancer cell nuclei.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:32814053
    review:
      summary: 'PMID:32814053 maps interactomes of neurodegenerative disease proteins
        including Huntingtin. EDF1 was identified as an HTT interactor in this proteomics
        study.

        '
      action: REMOVE
      reason: 'High-throughput interactome study. While EDF1-HTT interaction is documented,
        the generic "protein binding" term is uninformative. The biological relevance
        of this interaction is not characterized.

        '
      supported_by:
        - reference_id: PMID:32814053
          supporting_text: Interactome Mapping Provides a Network of 
            Neurodegenerative Disease Proteins and Uncovers Widespread Protein 
            Aggregation in Affected Brains.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:35156780
    review:
      summary: 'PMID:35156780 studies CFTR interactome using membrane two-hybrid screening.
        EDF1 was identified as a CFTR interactor.

        '
      action: REMOVE
      reason: 'High-throughput CFTR interactome study. The relevance of EDF1-CFTR
        interaction is unclear and not characterized. Generic "protein binding" is
        uninformative.

        '
      supported_by:
        - reference_id: PMID:35156780
          supporting_text: CFTR interactome mapping using the mammalian membrane
            two-hybrid high-throughput screening system.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:36012204
    review:
      summary: 'PMID:36012204 uses proximity labeling to identify CFTR interactors.
        EDF1 was enriched in this proteomics study.

        '
      action: REMOVE
      reason: 'High-throughput proximity labeling study for CFTR. Generic "protein
        binding" annotation is uninformative. The biological significance of EDF1
        in CFTR interactome is not established.

        '
      supported_by:
        - reference_id: PMID:36012204
          supporting_text: Differential CFTR-Interactome Proximity Labeling 
            Procedures Identify Enrichment in Multiple SLC Transporters.
  - term:
      id: GO:0005654
      label: nucleoplasm
    evidence_type: IDA
    original_reference_id: GO_REF:0000052
    review:
      summary: 'Nucleoplasm localization based on immunofluorescence data from Human
        Protein Atlas. Consistent with known nuclear localization of EDF1 when functioning
        as transcriptional coactivator.

        '
      action: ACCEPT
      reason: 'EDF1 functions as a transcriptional coactivator in the nucleus, consistent
        with nucleoplasm localization. IDA evidence from immunofluorescence is appropriate.

        '
      supported_by:
        - reference_id: PMID:10567391
          supporting_text: The role of human MBF1 as a transcriptional 
            coactivator.
  - term:
      id: GO:0005829
      label: cytosol
    evidence_type: IDA
    original_reference_id: GO_REF:0000052
    review:
      summary: 'Cytosol localization from Human Protein Atlas immunofluorescence.
        Consistent with EDF1''s cytosolic role in calmodulin sequestration and ribosome
        quality control.

        '
      action: ACCEPT
      reason: 'EDF1 has well-documented cytosolic functions including calmodulin binding
        and ribosome collision response. Cytosol localization is experimentally validated.

        '
      supported_by:
        - reference_id: PMID:10567391
          supporting_text: The role of human MBF1 as a transcriptional 
            coactivator.
  - term:
      id: GO:0001094
      label: TFIID-class transcription factor complex binding
    evidence_type: IDA
    original_reference_id: PMID:12040021
    review:
      summary: 'EDF1 directly binds TBP (a core TFIID component) and the TFIID complex
        to mediate transcriptional coactivation. This is a core molecular function
        of MBF1 proteins.

        '
      action: ACCEPT
      reason: 'Direct binding to TFIID complex is central to EDF1''s coactivator function.
        "MBF-1 interacts in vitro with the transcription factor IID complex" and "MBF-1
        seems therefore to act as a bridging factor enabling interactions of nuclear
        receptors with the transcription machinery" [PMID:12040021].

        '
      supported_by:
        - reference_id: PMID:12040021
          supporting_text: Multiprotein bridging factor-1 (MBF-1) is a cofactor 
            for nuclear receptors that regulate lipid metabolism.
        - reference_id: PMID:10567391
          supporting_text: The role of human MBF1 as a transcriptional 
            coactivator.
  - term:
      id: GO:0003723
      label: RNA binding
    evidence_type: HDA
    original_reference_id: PMID:22658674
    review:
      summary: 'PMID:22658674 is the Castello et al. mRNA interactome capture study
        that identified ~860 RNA-binding proteins in HeLa cells. EDF1 was identified
        as an RNA-binding protein. This is consistent with EDF1''s role in ribosome
        collision response where it interacts with mRNA and ribosomes.

        '
      action: ACCEPT
      reason: 'RNA binding is consistent with EDF1''s established role at collided
        ribosomes where it interacts with mRNA at the ribosome collision interface.
        Recent cryo-EM structures show EDF1 occupying the mRNA entry channel of the
        40S subunit.

        '
      additional_reference_ids:
        - eLife:58828
      supported_by:
        - reference_id: PMID:22658674
          supporting_text: May 31. Insights into RNA biology from an atlas of 
            mammalian mRNA-binding proteins.
  - term:
      id: GO:0003723
      label: RNA binding
    evidence_type: HDA
    original_reference_id: PMID:22681889
    review:
      summary: 'PMID:22681889 (Baltz et al.) is another mRNA-bound proteome study
        identifying ~800 mRNA-binding proteins. EDF1 was identified in this independent
        screen, corroborating RNA binding function.

        '
      action: ACCEPT
      reason: 'Independent confirmation of RNA binding from proteome-wide mRNA-bound
        protein identification. Consistent with EDF1''s ribosome-associated functions.

        '
      supported_by:
        - reference_id: PMID:22681889
          supporting_text: The mRNA-bound proteome and its global occupancy 
            profile on protein-coding transcripts.
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: NAS
    original_reference_id: PMID:8164657
    review:
      summary: 'PMID:8164657 is the original MBF1 characterization in silkworm. While
        this paper establishes MBF1 function, it does not directly demonstrate human
        EDF1 nuclear localization. Other references provide direct evidence.

        '
      action: ACCEPT
      reason: 'Although PMID:8164657 is about silkworm MBF1, nuclear localization
        of human EDF1 is well established by other studies. The NAS evidence code
        indicates the reviewer traced evidence to this paper describing the conserved
        bridging function.

        '
      supported_by:
        - reference_id: PMID:8164657
          supporting_text: Mediators of activation of fushi tarazu gene 
            transcription by BmFTZ-F1.
  - term:
      id: GO:0006355
      label: regulation of DNA-templated transcription
    evidence_type: TAS
    original_reference_id: PMID:8164657
    review:
      summary: 'MBF1/EDF1 regulates transcription by bridging transcription factors
        to TBP. This is the core function established in the original characterization
        paper.

        '
      action: ACCEPT
      reason: 'Transcriptional regulation is the defining function of MBF1 proteins.
        "MBF1 and MBF2 form a bridge between BmFTZ-F1 and TBP and mediate transactivation"
        [PMID:8164657]. This function is conserved in human EDF1.

        '
      supported_by:
        - reference_id: PMID:8164657
          supporting_text: Mediators of activation of fushi tarazu gene 
            transcription by BmFTZ-F1.
  - term:
      id: GO:0045893
      label: positive regulation of DNA-templated transcription
    evidence_type: TAS
    original_reference_id: PMID:8164657
    review:
      summary: 'EDF1/MBF1 functions as a transcriptional coactivator, positively regulating
        transcription of target genes. This is more specific than generic regulation.

        '
      action: ACCEPT
      reason: 'MBF1 proteins mediate transcriptional activation, not repression. "MBF1
        and MBF2 mediate activation of in vitro transcription from the fushi tarazu
        promoter by BmFTZ-F1" [PMID:8164657].

        '
      supported_by:
        - reference_id: PMID:8164657
          supporting_text: Mediators of activation of fushi tarazu gene 
            transcription by BmFTZ-F1.
  - term:
      id: GO:0043388
      label: positive regulation of DNA binding
    evidence_type: IDA
    original_reference_id: PMID:10567391
    review:
      summary: 'EDF1 enhances DNA-binding activity of transcription factors like ATF1
        and NR5A1. This is consistent with its coactivator function.

        '
      action: ACCEPT
      reason: '"hMBF1 enhanced the DNA-binding activity of Ad4BP/SF-1" and similar
        effects on ATF family transcription factors are documented in PMID:10567391.

        '
      supported_by:
        - reference_id: PMID:10567391
          supporting_text: The role of human MBF1 as a transcriptional 
            coactivator.
  - term:
      id: GO:0003713
      label: transcription coactivator activity
    evidence_type: IMP
    original_reference_id: PMID:10567391
    review:
      summary: 'Transcription coactivator activity is the defining molecular function
        of EDF1. Demonstrated through multiple reporter assays showing enhancement
        of transcription factor activity.

        '
      action: ACCEPT
      reason: 'Core molecular function. "hMBF1 mediated Ad4BP/SF-1-dependent transcriptional
        activation" and "hMBF1 also bound to ATF1, a member of the basic leucine zipper
        protein family, and mediated its activity as a transcriptional activator"
        [PMID:10567391].

        '
      supported_by:
        - reference_id: PMID:10567391
          supporting_text: The role of human MBF1 as a transcriptional 
            coactivator.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:10567391
    review:
      summary: 'PMID:10567391 documents binding to TBP, NR5A1, FOS, JUN, and ATF1.
        These are characterized interactions central to EDF1 function, but "protein
        binding" is too generic.

        '
      action: MODIFY
      reason: 'The specific interactions documented (TBP, nuclear receptors, bZIP
        transcription factors) have more informative GO terms. Generic "protein binding"
        should be replaced with specific molecular function terms.

        '
      proposed_replacement_terms:
        - id: GO:0001094
          label: TFIID-class transcription factor complex binding
        - id: GO:0035257
          label: nuclear hormone receptor binding
        - id: GO:0070064
          label: proline-rich region binding
      supported_by:
        - reference_id: PMID:10567391
          supporting_text: The role of human MBF1 as a transcriptional 
            coactivator.
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: IDA
    original_reference_id: PMID:10567391
    review:
      summary: 'IDA evidence for nuclear localization from PMID:10567391, showing
        nuclear accumulation upon coexpression with NR5A1.

        '
      action: ACCEPT
      reason: 'Direct experimental demonstration of nuclear localization under activating
        conditions.

        '
      supported_by:
        - reference_id: PMID:10567391
          supporting_text: The role of human MBF1 as a transcriptional 
            coactivator.
  - term:
      id: GO:0005737
      label: cytoplasm
    evidence_type: IDA
    original_reference_id: PMID:10567391
    review:
      summary: 'IDA evidence for cytoplasmic localization from immunostaining in PMID:10567391.

        '
      action: ACCEPT
      reason: 'Direct experimental demonstration of cytoplasmic localization.

        '
      supported_by:
        - reference_id: PMID:10567391
          supporting_text: The role of human MBF1 as a transcriptional 
            coactivator.
  - term:
      id: GO:0003713
      label: transcription coactivator activity
    evidence_type: IMP
    original_reference_id: PMID:12040021
    review:
      summary: 'Transcription coactivator activity demonstrated for nuclear receptors
        involved in lipid metabolism (NR1H3/LXRa, PPARg, NR5A2/LRH-1).

        '
      action: ACCEPT
      reason: 'Core molecular function. "MBF-1 enhances the transcriptional activity
        of several nonsteroid nuclear receptors that are implicated in lipid metabolism"
        [PMID:12040021].

        '
      supported_by:
        - reference_id: PMID:12040021
          supporting_text: Multiprotein bridging factor-1 (MBF-1) is a cofactor 
            for nuclear receptors that regulate lipid metabolism.
  - term:
      id: GO:0006355
      label: regulation of DNA-templated transcription
    evidence_type: TAS
    original_reference_id: PMID:12040021
    review:
      summary: 'General transcriptional regulation term appropriate for EDF1''s coactivator
        function.

        '
      action: ACCEPT
      reason: 'EDF1 regulates transcription by nuclear receptors including NR1H3,
        PPARg, NR5A2.

        '
      supported_by:
        - reference_id: PMID:12040021
          supporting_text: Multiprotein bridging factor-1 (MBF-1) is a cofactor 
            for nuclear receptors that regulate lipid metabolism.
  - term:
      id: GO:0019216
      label: regulation of lipid metabolic process
    evidence_type: TAS
    original_reference_id: PMID:12040021
    review:
      summary: 'EDF1 coactivates nuclear receptors (NR1H3/LXRa, PPARg) that regulate
        lipid metabolism genes. This is a downstream consequence of its coactivator
        function rather than a direct role in lipid metabolism.

        '
      action: KEEP_AS_NON_CORE
      reason: 'While EDF1 enhances transcription by lipid metabolism-regulating nuclear
        receptors, this is an indirect effect through its coactivator function. It
        is not a lipid metabolism enzyme or direct regulator.

        '
      supported_by:
        - reference_id: PMID:12040021
          supporting_text: Multiprotein bridging factor-1 (MBF-1) is a cofactor 
            for nuclear receptors that regulate lipid metabolism.
  - term:
      id: GO:0045446
      label: endothelial cell differentiation
    evidence_type: TAS
    original_reference_id: PMID:12040021
    review:
      summary: 'EDF1 was named for its original identification in the context of endothelial
        differentiation. Its knockdown affects endothelial cell organization into
        capillary-like networks.

        '
      action: KEEP_AS_NON_CORE
      reason: 'While EDF1 affects endothelial differentiation phenotypes, this is
        a downstream consequence of its calmodulin-sequestering and transcriptional
        coactivator functions rather than a direct role in differentiation machinery.
        The deep research notes "EDF1 appears to restrain full endothelial differentiation."

        '
      supported_by:
        - reference_id: PMID:12040021
          supporting_text: Multiprotein bridging factor-1 (MBF-1) is a cofactor 
            for nuclear receptors that regulate lipid metabolism.
references:
  - id: GO_REF:0000033
    title: Annotation inferences using phylogenetic trees
    findings:
      - {}
  - id: GO_REF:0000043
    title: Gene Ontology annotation based on UniProtKB/Swiss-Prot keyword 
      mapping
    findings: []
  - id: GO_REF:0000044
    title: Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular 
      Location vocabulary mapping
    findings: []
  - id: GO_REF:0000052
    title: Gene Ontology annotation based on curation of immunofluorescence data
    findings:
      - {}
  - id: GO_REF:0000120
    title: Combined Automated Annotation using Multiple IEA Methods
    findings: []
  - id: PMID:10567391
    title: The role of human MBF1 as a transcriptional coactivator.
    findings:
      - {}
      - {}
      - {}
      - {}
      - {}
  - id: PMID:12040021
    title: Multiprotein bridging factor-1 (MBF-1) is a cofactor for nuclear 
      receptors that regulate lipid metabolism.
    findings:
      - {}
      - {}
      - {}
      - {}
  - id: PMID:21217774
    title: RAC3 is a pro-migratory co-activator of ERα.
    findings:
      - {}
  - id: PMID:22658674
    title: Insights into RNA biology from an atlas of mammalian mRNA-binding 
      proteins.
    findings:
      - {}
  - id: PMID:22681889
    title: The mRNA-bound proteome and its global occupancy profile on 
      protein-coding transcripts.
    findings:
      - {}
  - id: PMID:24008843
    title: Structure homology and interaction redundancy for discovering 
      virus-host protein interactions.
    findings: []
  - id: PMID:25416956
    title: A proteome-scale map of the human interactome network.
    findings:
      - {}
  - id: PMID:31527615
    title: The RNA-mediated estrogen receptor α interactome of hormone-dependent
      human breast cancer cell nuclei.
    findings: []
  - id: PMID:32814053
    title: Interactome Mapping Provides a Network of Neurodegenerative Disease 
      Proteins and Uncovers Widespread Protein Aggregation in Affected Brains.
    findings: []
  - id: PMID:35156780
    title: CFTR interactome mapping using the mammalian membrane two-hybrid 
      high-throughput screening system.
    findings: []
  - id: PMID:36012204
    title: Differential CFTR-Interactome Proximity Labeling Procedures Identify 
      Enrichment in Multiple SLC Transporters.
    findings: []
  - id: PMID:8164657
    title: Mediators of activation of fushi tarazu gene transcription by 
      BmFTZ-F1.
    findings:
      - {}
      - {}
      - {}
  - id: file:human/EDF1/EDF1-deep-research-openai.md
    title: Deep research on EDF1 function
    findings: []
core_functions:
  - molecular_function:
      id: GO:0003713
      label: transcription coactivator activity
    description: EDF1 is an evolutionarily conserved transcriptional coactivator
      that bridges gene-specific transcription factors (nuclear receptors NR5A1,
      NR1H3, PPARg; bZIP factors ATF1, ATF2, CREB1) to the TATA-binding protein 
      (TBP) component of the general transcription machinery [PMID:10567391, 
      PMID:12040021].
  - molecular_function:
      id: GO:0005516
      label: calmodulin binding
    description: EDF1 contains an IQ motif that mediates calcium- and 
      phosphorylation-dependent binding to calmodulin. This regulates eNOS 
      activity in endothelial cells by sequestering calmodulin in the cytoplasm 
      [PMID:10816571, PMID:15112053].
  - molecular_function:
      id: GO:0001094
      label: TFIID-class transcription factor complex binding
    description: Direct binding to TBP and the TFIID complex is central to 
      EDF1's bridging function between activators and the basal transcription 
      machinery [PMID:10567391, PMID:12040021].
  - molecular_function:
      id: GO:0003723
      label: RNA binding
    description: EDF1 was identified as an mRNA-binding protein in two 
      independent proteomics studies [PMID:22658674, PMID:22681889]. This is 
      consistent with its role at collided ribosomes where structural studies 
      show it contacts mRNA.
status: COMPLETE

GO Term	Evidence	Action	Reason
GO:0005634 nucleus	IBA GO_REF:0000033	ACCEPT	Summary: EDF1 localizes to both cytoplasm and nucleus, with nuclear localization enhanced by PKA-mediated phosphorylation or by co-expression with nuclear receptors like NR5A1 [PMID:10567391, PMID:15112053]. The IBA annotation is phylogenetically well-supported and consistent with experimental evidence. Reason: Nuclear localization is experimentally validated. Studies show that "coexpression of the nuclear protein Ad4BP/SF-1 with hMBF1 induced accumulation of hMBF1 in the nucleus" [PMID:10567391] and PKA activation promotes nuclear accumulation [PMID:15112053]. Supporting Evidence: PMID:10567391 The role of human MBF1 as a transcriptional coactivator. file:human/EDF1/EDF1-deep-research-openai.md
GO:0003677 DNA binding	IEA GO_REF:0000120	MODIFY	Summary: EDF1 contains a C-terminal Cro/C1-type helix-turn-helix domain (IPR001387), a known DNA-binding motif. However, experimental studies show that MBF1 does not directly bind DNA [PMID:8164657]. The HTH domain appears to function in ribosome binding rather than DNA binding. Reason: The original MBF1 characterization paper explicitly states "Neither MBF1, MBF2, nor a combination of them binds to DNA" [PMID:8164657]. Although EDF1 has a DNA-binding domain fold, it functions as a bridging factor rather than a direct DNA binder. The HTH domain functions in ribosome binding during collision response. Proposed replacements: RNA polymerase II cis-regulatory region sequence-specific DNA binding transcription factor activity Supporting Evidence: PMID:8164657 Mediators of activation of fushi tarazu gene transcription by BmFTZ-F1.
GO:0005516 calmodulin binding	IEA GO_REF:0000043	ACCEPT	Summary: EDF1 contains an IQ motif and experimentally binds calmodulin in a calcium- and phosphorylation- regulated manner [PMID:10816571, PMID:15112053]. This is a well-established core function. Reason: Calmodulin binding is experimentally demonstrated. UniProt records that "Binding to calmodulin is regulated by calcium and phosphorylation of the IQ motif" based on PMID:10816571 and PMID:15112053. Multiple mutagenesis studies confirm specific residues involved in CALM binding. Supporting Evidence: PMID:10816571 PMID:15112053
GO:0005634 nucleus	IEA GO_REF:0000044	ACCEPT	Summary: Duplicate of IBA annotation. IEA mapping from UniProt subcellular location vocabulary. Nuclear localization is well supported experimentally. Reason: Nuclear localization is confirmed by multiple experimental studies showing EDF1 localizes to the nucleus upon activation by PKA or binding to nuclear receptors. Supporting Evidence: PMID:10567391 The role of human MBF1 as a transcriptional coactivator.
GO:0005737 cytoplasm	IEA GO_REF:0000044	ACCEPT	Summary: EDF1 localizes to cytoplasm where it sequesters calmodulin. IEA from UniProt subcellular location vocabulary, supported by experimental evidence. Reason: Cytoplasmic localization is experimentally validated, particularly in resting cells where EDF1 binds calmodulin. "While hMBF1 was detected in the cytoplasm by immunostaining" [PMID:10567391]. Supporting Evidence: PMID:10567391 The role of human MBF1 as a transcriptional coactivator.
GO:0030154 cell differentiation	IEA GO_REF:0000043	KEEP AS NON CORE	Summary: While EDF1 was named for its role in endothelial differentiation and affects differentiation phenotypes when knocked down, this term is very broad. The protein is involved in transcriptional regulation that affects differentiation rather than being a core differentiation factor. Reason: EDF1 silencing affects endothelial cell organization into capillary networks (differentiation) [PMID:20185128], but this is a downstream consequence of its calmodulin-sequestering and transcriptional coactivator functions rather than a direct role in differentiation machinery. Supporting Evidence: PMID:20185128
GO:0005515 protein binding	IPI PMID:12040021 Multiprotein bridging factor-1 (MBF-1) is a cofactor for nuc...	MODIFY	Summary: This IPI evidence from PMID:12040021 documents binding to nuclear receptors (NR5A2, NR1H3, PPARg) and the TFIID complex. The term "protein binding" is too generic; more specific terms exist for these interactions. Reason: "protein binding" is uninformative for annotation purposes. The specific interactions documented are with nuclear receptors and transcription factor complexes, which have more specific GO terms. The coactivator function is already captured by GO:0003713. Proposed replacements: TFIID-class transcription factor complex binding nuclear hormone receptor binding Supporting Evidence: PMID:12040021 Multiprotein bridging factor-1 (MBF-1) is a cofactor for nuclear receptors that regulate lipid metabolism.
GO:0005515 protein binding	IPI PMID:21217774 RAC3 is a pro-migratory co-activator of ERα.	REMOVE	Summary: PMID:21217774 is about RAC3 as an ERalpha coactivator. EDF1 appears in the phage display screen as an interactor (Supplemental Table 1), but this is a high-throughput study and EDF1 was not further characterized. Reason: This paper focuses on RAC3, not EDF1. EDF1 was identified in a phage display screen but not validated or characterized. The "protein binding" term provides no functional insight. Supporting Evidence: PMID:21217774 RAC3 is a pro-migratory co-activator of ERα.
GO:0005515 protein binding	IPI PMID:24008843 Structure homology and interaction redundancy for discoverin...	REMOVE	Summary: PMID:24008843 describes computational prediction of virus-host interactions using structure homology. This is a high-throughput computational study, not experimental characterization of EDF1 interactions. Reason: This paper describes computational predictions of virus-host interactions, not experimental evidence for EDF1 protein binding. The "protein binding" annotation provides no biological insight about EDF1 function. Supporting Evidence: PMID:24008843 Structure homology and interaction redundancy for discovering virus-host protein interactions.
GO:0005515 protein binding	IPI PMID:25416956 A proteome-scale map of the human interactome network.	REMOVE	Summary: PMID:25416956 is the HI-III human interactome map - a large-scale Y2H study. EDF1 interactions were identified in this systematic screen but the term "protein binding" is uninformative. Reason: Large-scale interactome study providing no functional insight about specific EDF1 interactions. "protein binding" annotation without specifying binding partners is not informative for gene function annotation. Supporting Evidence: PMID:25416956 A proteome-scale map of the human interactome network.
GO:0005515 protein binding	IPI PMID:31527615 The RNA-mediated estrogen receptor α interactome of hormone-...	REMOVE	Summary: PMID:31527615 examines the RNA-mediated estrogen receptor alpha interactome. EDF1 was identified in this proteomics study but the generic "protein binding" term provides no functional insight. Reason: High-throughput proteomics study. Generic "protein binding" annotation is uninformative. If EDF1 specifically interacts with ESR1 in transcriptional regulation, more specific terms should be used. Supporting Evidence: PMID:31527615 The RNA-mediated estrogen receptor α interactome of hormone-dependent human breast cancer cell nuclei.
GO:0005515 protein binding	IPI PMID:32814053 Interactome Mapping Provides a Network of Neurodegenerative ...	REMOVE	Summary: PMID:32814053 maps interactomes of neurodegenerative disease proteins including Huntingtin. EDF1 was identified as an HTT interactor in this proteomics study. Reason: High-throughput interactome study. While EDF1-HTT interaction is documented, the generic "protein binding" term is uninformative. The biological relevance of this interaction is not characterized. Supporting Evidence: PMID:32814053 Interactome Mapping Provides a Network of Neurodegenerative Disease Proteins and Uncovers Widespread Protein Aggregation in Affected Brains.
GO:0005515 protein binding	IPI PMID:35156780 CFTR interactome mapping using the mammalian membrane two-hy...	REMOVE	Summary: PMID:35156780 studies CFTR interactome using membrane two-hybrid screening. EDF1 was identified as a CFTR interactor. Reason: High-throughput CFTR interactome study. The relevance of EDF1-CFTR interaction is unclear and not characterized. Generic "protein binding" is uninformative. Supporting Evidence: PMID:35156780 CFTR interactome mapping using the mammalian membrane two-hybrid high-throughput screening system.
GO:0005515 protein binding	IPI PMID:36012204 Differential CFTR-Interactome Proximity Labeling Procedures ...	REMOVE	Summary: PMID:36012204 uses proximity labeling to identify CFTR interactors. EDF1 was enriched in this proteomics study. Reason: High-throughput proximity labeling study for CFTR. Generic "protein binding" annotation is uninformative. The biological significance of EDF1 in CFTR interactome is not established. Supporting Evidence: PMID:36012204 Differential CFTR-Interactome Proximity Labeling Procedures Identify Enrichment in Multiple SLC Transporters.
GO:0005654 nucleoplasm	IDA GO_REF:0000052	ACCEPT	Summary: Nucleoplasm localization based on immunofluorescence data from Human Protein Atlas. Consistent with known nuclear localization of EDF1 when functioning as transcriptional coactivator. Reason: EDF1 functions as a transcriptional coactivator in the nucleus, consistent with nucleoplasm localization. IDA evidence from immunofluorescence is appropriate. Supporting Evidence: PMID:10567391 The role of human MBF1 as a transcriptional coactivator.
GO:0005829 cytosol	IDA GO_REF:0000052	ACCEPT	Summary: Cytosol localization from Human Protein Atlas immunofluorescence. Consistent with EDF1's cytosolic role in calmodulin sequestration and ribosome quality control. Reason: EDF1 has well-documented cytosolic functions including calmodulin binding and ribosome collision response. Cytosol localization is experimentally validated. Supporting Evidence: PMID:10567391 The role of human MBF1 as a transcriptional coactivator.
GO:0001094 TFIID-class transcription factor complex binding	IDA PMID:12040021 Multiprotein bridging factor-1 (MBF-1) is a cofactor for nuc...	ACCEPT	Summary: EDF1 directly binds TBP (a core TFIID component) and the TFIID complex to mediate transcriptional coactivation. This is a core molecular function of MBF1 proteins. Reason: Direct binding to TFIID complex is central to EDF1's coactivator function. "MBF-1 interacts in vitro with the transcription factor IID complex" and "MBF-1 seems therefore to act as a bridging factor enabling interactions of nuclear receptors with the transcription machinery" [PMID:12040021]. Supporting Evidence: PMID:12040021 Multiprotein bridging factor-1 (MBF-1) is a cofactor for nuclear receptors that regulate lipid metabolism. PMID:10567391 The role of human MBF1 as a transcriptional coactivator.
GO:0003723 RNA binding	HDA PMID:22658674 Insights into RNA biology from an atlas of mammalian mRNA-bi...	ACCEPT	Summary: PMID:22658674 is the Castello et al. mRNA interactome capture study that identified ~860 RNA-binding proteins in HeLa cells. EDF1 was identified as an RNA-binding protein. This is consistent with EDF1's role in ribosome collision response where it interacts with mRNA and ribosomes. Reason: RNA binding is consistent with EDF1's established role at collided ribosomes where it interacts with mRNA at the ribosome collision interface. Recent cryo-EM structures show EDF1 occupying the mRNA entry channel of the 40S subunit. Supporting Evidence: PMID:22658674 May 31. Insights into RNA biology from an atlas of mammalian mRNA-binding proteins.
GO:0003723 RNA binding	HDA PMID:22681889 The mRNA-bound proteome and its global occupancy profile on ...	ACCEPT	Summary: PMID:22681889 (Baltz et al.) is another mRNA-bound proteome study identifying ~800 mRNA-binding proteins. EDF1 was identified in this independent screen, corroborating RNA binding function. Reason: Independent confirmation of RNA binding from proteome-wide mRNA-bound protein identification. Consistent with EDF1's ribosome-associated functions. Supporting Evidence: PMID:22681889 The mRNA-bound proteome and its global occupancy profile on protein-coding transcripts.
GO:0005634 nucleus	NAS PMID:8164657 Mediators of activation of fushi tarazu gene transcription b...	ACCEPT	Summary: PMID:8164657 is the original MBF1 characterization in silkworm. While this paper establishes MBF1 function, it does not directly demonstrate human EDF1 nuclear localization. Other references provide direct evidence. Reason: Although PMID:8164657 is about silkworm MBF1, nuclear localization of human EDF1 is well established by other studies. The NAS evidence code indicates the reviewer traced evidence to this paper describing the conserved bridging function. Supporting Evidence: PMID:8164657 Mediators of activation of fushi tarazu gene transcription by BmFTZ-F1.
GO:0006355 regulation of DNA-templated transcription	TAS PMID:8164657 Mediators of activation of fushi tarazu gene transcription b...	ACCEPT	Summary: MBF1/EDF1 regulates transcription by bridging transcription factors to TBP. This is the core function established in the original characterization paper. Reason: Transcriptional regulation is the defining function of MBF1 proteins. "MBF1 and MBF2 form a bridge between BmFTZ-F1 and TBP and mediate transactivation" [PMID:8164657]. This function is conserved in human EDF1. Supporting Evidence: PMID:8164657 Mediators of activation of fushi tarazu gene transcription by BmFTZ-F1.
GO:0045893 positive regulation of DNA-templated transcription	TAS PMID:8164657 Mediators of activation of fushi tarazu gene transcription b...	ACCEPT	Summary: EDF1/MBF1 functions as a transcriptional coactivator, positively regulating transcription of target genes. This is more specific than generic regulation. Reason: MBF1 proteins mediate transcriptional activation, not repression. "MBF1 and MBF2 mediate activation of in vitro transcription from the fushi tarazu promoter by BmFTZ-F1" [PMID:8164657]. Supporting Evidence: PMID:8164657 Mediators of activation of fushi tarazu gene transcription by BmFTZ-F1.
GO:0043388 positive regulation of DNA binding	IDA PMID:10567391 The role of human MBF1 as a transcriptional coactivator.	ACCEPT	Summary: EDF1 enhances DNA-binding activity of transcription factors like ATF1 and NR5A1. This is consistent with its coactivator function. Reason: "hMBF1 enhanced the DNA-binding activity of Ad4BP/SF-1" and similar effects on ATF family transcription factors are documented in PMID:10567391. Supporting Evidence: PMID:10567391 The role of human MBF1 as a transcriptional coactivator.
GO:0003713 transcription coactivator activity	IMP PMID:10567391 The role of human MBF1 as a transcriptional coactivator.	ACCEPT	Summary: Transcription coactivator activity is the defining molecular function of EDF1. Demonstrated through multiple reporter assays showing enhancement of transcription factor activity. Reason: Core molecular function. "hMBF1 mediated Ad4BP/SF-1-dependent transcriptional activation" and "hMBF1 also bound to ATF1, a member of the basic leucine zipper protein family, and mediated its activity as a transcriptional activator" [PMID:10567391]. Supporting Evidence: PMID:10567391 The role of human MBF1 as a transcriptional coactivator.
GO:0005515 protein binding	IPI PMID:10567391 The role of human MBF1 as a transcriptional coactivator.	MODIFY	Summary: PMID:10567391 documents binding to TBP, NR5A1, FOS, JUN, and ATF1. These are characterized interactions central to EDF1 function, but "protein binding" is too generic. Reason: The specific interactions documented (TBP, nuclear receptors, bZIP transcription factors) have more informative GO terms. Generic "protein binding" should be replaced with specific molecular function terms. Proposed replacements: TFIID-class transcription factor complex binding nuclear hormone receptor binding proline-rich region binding Supporting Evidence: PMID:10567391 The role of human MBF1 as a transcriptional coactivator.
GO:0005634 nucleus	IDA PMID:10567391 The role of human MBF1 as a transcriptional coactivator.	ACCEPT	Summary: IDA evidence for nuclear localization from PMID:10567391, showing nuclear accumulation upon coexpression with NR5A1. Reason: Direct experimental demonstration of nuclear localization under activating conditions. Supporting Evidence: PMID:10567391 The role of human MBF1 as a transcriptional coactivator.
GO:0005737 cytoplasm	IDA PMID:10567391 The role of human MBF1 as a transcriptional coactivator.	ACCEPT	Summary: IDA evidence for cytoplasmic localization from immunostaining in PMID:10567391. Reason: Direct experimental demonstration of cytoplasmic localization. Supporting Evidence: PMID:10567391 The role of human MBF1 as a transcriptional coactivator.
GO:0003713 transcription coactivator activity	IMP PMID:12040021 Multiprotein bridging factor-1 (MBF-1) is a cofactor for nuc...	ACCEPT	Summary: Transcription coactivator activity demonstrated for nuclear receptors involved in lipid metabolism (NR1H3/LXRa, PPARg, NR5A2/LRH-1). Reason: Core molecular function. "MBF-1 enhances the transcriptional activity of several nonsteroid nuclear receptors that are implicated in lipid metabolism" [PMID:12040021]. Supporting Evidence: PMID:12040021 Multiprotein bridging factor-1 (MBF-1) is a cofactor for nuclear receptors that regulate lipid metabolism.
GO:0006355 regulation of DNA-templated transcription	TAS PMID:12040021 Multiprotein bridging factor-1 (MBF-1) is a cofactor for nuc...	ACCEPT	Summary: General transcriptional regulation term appropriate for EDF1's coactivator function. Reason: EDF1 regulates transcription by nuclear receptors including NR1H3, PPARg, NR5A2. Supporting Evidence: PMID:12040021 Multiprotein bridging factor-1 (MBF-1) is a cofactor for nuclear receptors that regulate lipid metabolism.
GO:0019216 regulation of lipid metabolic process	TAS PMID:12040021 Multiprotein bridging factor-1 (MBF-1) is a cofactor for nuc...	KEEP AS NON CORE	Summary: EDF1 coactivates nuclear receptors (NR1H3/LXRa, PPARg) that regulate lipid metabolism genes. This is a downstream consequence of its coactivator function rather than a direct role in lipid metabolism. Reason: While EDF1 enhances transcription by lipid metabolism-regulating nuclear receptors, this is an indirect effect through its coactivator function. It is not a lipid metabolism enzyme or direct regulator. Supporting Evidence: PMID:12040021 Multiprotein bridging factor-1 (MBF-1) is a cofactor for nuclear receptors that regulate lipid metabolism.
GO:0045446 endothelial cell differentiation	TAS PMID:12040021 Multiprotein bridging factor-1 (MBF-1) is a cofactor for nuc...	KEEP AS NON CORE	Summary: EDF1 was named for its original identification in the context of endothelial differentiation. Its knockdown affects endothelial cell organization into capillary-like networks. Reason: While EDF1 affects endothelial differentiation phenotypes, this is a downstream consequence of its calmodulin-sequestering and transcriptional coactivator functions rather than a direct role in differentiation machinery. The deep research notes "EDF1 appears to restrain full endothelial differentiation." Supporting Evidence: PMID:12040021 Multiprotein bridging factor-1 (MBF-1) is a cofactor for nuclear receptors that regulate lipid metabolism.

EDF1

Gene Description

Existing Annotations Review

Core Functions

EDF1 is an evolutionarily conserved transcriptional coactivator that bridges gene-specific transcription factors (nuclear receptors NR5A1, NR1H3, PPARg; bZIP factors ATF1, ATF2, CREB1) to the TATA-binding protein (TBP) component of the general transcription machinery [PMID:10567391, PMID:12040021].

EDF1 contains an IQ motif that mediates calcium- and phosphorylation-dependent binding to calmodulin. This regulates eNOS activity in endothelial cells by sequestering calmodulin in the cytoplasm [PMID:10816571, PMID:15112053].

Direct binding to TBP and the TFIID complex is central to EDF1's bridging function between activators and the basal transcription machinery [PMID:10567391, PMID:12040021].

EDF1 was identified as an mRNA-binding protein in two independent proteomics studies [PMID:22658674, PMID:22681889]. This is consistent with its role at collided ribosomes where structural studies show it contacts mRNA.

References

📚 Additional Documentation

Deep Research Openai

Question

Gene Research for Functional Annotation

⚠️ CRITICAL: Gene/Protein Identification Context

Target Gene/Protein Identity (from UniProt):

MANDATORY VERIFICATION STEPS:

If Gene Symbol is Ambiguous or You Cannot Find Relevant Literature:

Research Target:

Output

Functional Annotation of Human Endothelial Differentiation-Related Factor 1 (EDF1)

Gene Identity and Conservation

Protein Structure and Domains

Expression and Subcellular Localization

Role as a Transcriptional Coactivator

Calmodulin Binding and Endothelial Cell Function

Involvement in Cardiomyocyte Hypertrophy

Interaction with Metabolic Regulators

Role in Ribosome Quality Control and Stress Response

Biological and Clinical Significance

Citations

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