Existing Annotations Review

GO Term	Evidence	Action	Reason
GO:0004571 mannosyl-oligosaccharide 1,2-alpha-mannosidase activity	IBA GO_REF:0000033	ACCEPT	Summary: The defining molecular function of EDEM3; phylogenetic assignment of GH47 alpha-1,2-mannosidase activity is well supported across the EDEM/Htm1 family. Reason: Core molecular function; corroborated by EC 3.2.1.113, RHEA catalytic reactions, and the IMP endogenous-knockout evidence. Supporting Evidence: file:human/EDEM3/EDEM3-uniprot.txt catalyzing mannose trimming from Man8GlcNAc2 to Man7GlcNAc2 in the N-glycans
GO:0030968 endoplasmic reticulum unfolded protein response	IBA GO_REF:0000033	KEEP AS NON CORE	Summary: EDEM3 is a UPR-induced effector that functions in the ERAD arm of the ER stress response; phylogenetic assignment of involvement in the UPR is consistent with this. Reason: EDEM3 is a UPR-induced ERAD effector rather than a UPR signaling/sensing component; the informative function is the ERAD/mannose-trimming role. Supporting Evidence: file:human/EDEM3/EDEM3-uniprot.txt Involved in endoplasmic reticulum-associated degradation (ERAD)
GO:0097466 ubiquitin-dependent glycoprotein ERAD pathway	IBA GO_REF:0000033	ACCEPT	Summary: EDEM3 functions in N-glycan-dependent (glycoprotein) ERAD, trimming glycans to commit misfolded glycoproteins for proteasomal degradation; an accurate, specific process for EDEM3. Reason: Correct, specific core biological process; redundant with the experimental ERAD/mannose-trimming evidence. Supporting Evidence: file:human/EDEM3/EDEM3-uniprot.txt Accelerates the glycoprotein ERAD by proteasomes
GO:0004571 mannosyl-oligosaccharide 1,2-alpha-mannosidase activity	IEA GO_REF:0000120	ACCEPT	Summary: Electronic assignment of the core GH47 alpha-1,2-mannosidase activity (with EC 3.2.1.113 and RHEA reactions), consistent with experimental evidence. Reason: Correct core molecular function; redundant with IMP/ISS evidence. Supporting Evidence: file:human/EDEM3/EDEM3-uniprot.txt EC=3.2.1.113
GO:0005509 calcium ion binding	IEA GO_REF:0000002	KEEP AS NON CORE	Summary: GH47 mannosidases require a Ca2+ ion for catalysis; EDEM3 binds calcium as a structural/catalytic cofactor of its mannosidase activity. Reason: Accurate cofactor requirement of the GH47 fold but not a standalone core function; the catalytic mannosidase activity is the informative function. Supporting Evidence: file:human/EDEM3/EDEM3-uniprot.txt Name=Ca(2+)
GO:0005783 endoplasmic reticulum	IEA GO_REF:0000117	ACCEPT	Summary: EDEM3 is an ER-resident lumenal protein; electronic (ARBA) assignment of ER localization is correct. Reason: Correct site of action; redundant with the ER lumen annotation and UniProt subcellular location. Supporting Evidence: file:human/EDEM3/EDEM3-uniprot.txt SUBCELLULAR LOCATION: Endoplasmic reticulum lumen
GO:0005788 endoplasmic reticulum lumen	IEA GO_REF:0000120	ACCEPT	Summary: EDEM3 is a soluble ER lumenal protein (signal peptide, ER retention); electronic transfer of ER lumen localization is correct. Reason: Correct compartment; consistent with UniProt subcellular location. Supporting Evidence: file:human/EDEM3/EDEM3-uniprot.txt SUBCELLULAR LOCATION: Endoplasmic reticulum lumen
GO:0005975 carbohydrate metabolic process	IEA GO_REF:0000002	MARK AS OVER ANNOTATED	Summary: Generic carbohydrate metabolic process from InterPro; far less informative than the specific ER mannose trimming and glycoprotein ERAD processes EDEM3 participates in. Reason: Over-general parent; the specific ER mannose trimming (GO:1904380) and glycoprotein ERAD terms better capture the biology. Supporting Evidence: file:human/EDEM3/EDEM3-uniprot.txt catalyzing mannose trimming from Man8GlcNAc2 to Man7GlcNAc2 in the N-glycans
GO:0006516 glycoprotein catabolic process	IEA GO_REF:0000117	KEEP AS NON CORE	Summary: EDEM3 contributes to catabolism of glycoproteins via gpERAD; this parent process is correct but less informative than the specific glycoprotein ERAD term. Reason: Correct but generic; the specific ubiquitin-dependent glycoprotein ERAD pathway (GO:0097466) better captures EDEM3's role. Supporting Evidence: file:human/EDEM3/EDEM3-uniprot.txt Accelerates the glycoprotein ERAD by proteasomes
GO:0016020 membrane	IEA GO_REF:0000002	MARK AS OVER ANNOTATED	Summary: Generic membrane localization from InterPro. EDEM3 is in fact a soluble ER lumenal protein, so this term is both uninformative and a poor fit. Reason: Uninformative and inaccurate parent from a domain-based inference; EDEM3 is a soluble ER lumenal protein, better captured by ER lumen. Proposed replacements: endoplasmic reticulum lumen Supporting Evidence: file:human/EDEM3/EDEM3-uniprot.txt SUBCELLULAR LOCATION: Endoplasmic reticulum lumen
GO:1904380 endoplasmic reticulum mannose trimming	IEA GO_REF:0000120	ACCEPT	Summary: EDEM3 performs ER mannose trimming (Man8 to Man7 and beyond); electronic assignment is consistent with the IMP evidence. Reason: Correct core biological process; redundant with the IMP annotation from endogenous knockout analysis. Supporting Evidence: PMID:25092655 Mannose trimming from Man8GlcNAc2 to Man7GlcNAc2 is performed mainly by EDEM3 and to a lesser extent by EDEM1
GO:0036503 ERAD pathway	IEA GO_REF:0000120	ACCEPT	Summary: Electronic assignment of the ERAD pathway, consistent with experimental evidence that EDEM3 accelerates gpERAD. Reason: Correct core biological process; redundant with IMP evidence. Supporting Evidence: file:human/EDEM3/EDEM3-uniprot.txt Involved in endoplasmic reticulum-associated degradation (ERAD)
GO:0004571 mannosyl-oligosaccharide 1,2-alpha-mannosidase activity	TAS Reactome:R-HSA-6782685	ACCEPT	Summary: Reactome curation of EDEM3 (with EDEM1) hydrolysing Man8b to Man5 glycans, an accurate representation of EDEM3's downstream trimming activity. Reason: Correct core molecular function; consistent with the catalytic activity and IMP evidence. Supporting Evidence: file:human/EDEM3/EDEM3-uniprot.txt catalyzing mannose trimming from Man8GlcNAc2 to Man7GlcNAc2 in the N-glycans
GO:0036503 ERAD pathway	IMP PMID:25092655 EDEM2 initiates mammalian glycoprotein ERAD by catalyzing th...	ACCEPT	Summary: Endogenous EDEM3 knockout increased Man8B levels and impaired the second trimming step, consistent with delayed gpERAD; EDEM3 accelerates glycoprotein ERAD. Reason: Core biological process with direct experimental (IMP) support from endogenous gene knockout. Supporting Evidence: PMID:25092655 M8B is trimmed by EDEM1 and EDEM3 to Man7-5GlcNAc2, which are recognized by lectin OS-9
GO:1904380 endoplasmic reticulum mannose trimming	IMP PMID:25092655 EDEM2 initiates mammalian glycoprotein ERAD by catalyzing th...	ACCEPT	Summary: Endogenous EDEM3 knockout in human and chicken cells increased Man8B levels, demonstrating EDEM3 performs the second ER mannose-trimming step from Man8GlcNAc2 to Man7GlcNAc2. Reason: Core biological process with direct experimental (IMP) support. Supporting Evidence: PMID:25092655 Mannose trimming from Man8GlcNAc2 to Man7GlcNAc2 is performed mainly by EDEM3 and to a lesser extent by EDEM1
GO:0004571 mannosyl-oligosaccharide 1,2-alpha-mannosidase activity	ISS GO_REF:0000024	ACCEPT	Summary: Sequence-similarity transfer (from yeast Mns1, UniProtKB:P32906) of the alpha-1,2-mannosidase activity; consistent with the experimental and EC/RHEA evidence. Reason: Correct core molecular function; consistent with IMP/IEA evidence. Supporting Evidence: file:human/EDEM3/EDEM3-uniprot.txt EC=3.2.1.113
GO:1904382 mannose trimming involved in glycoprotein ERAD pathway	TAS Reactome:R-HSA-6782685	ACCEPT	Summary: Reactome curation of EDEM3 mannose trimming within the glycoprotein ERAD pathway; an accurate, specific refinement of EDEM3's trimming contribution to ERAD. Reason: Correct specific biological process linking the trimming activity to ERAD. Supporting Evidence: PMID:25092655 M8B is trimmed by EDEM1 and EDEM3 to Man7-5GlcNAc2, which are recognized by lectin OS-9
GO:0004571 mannosyl-oligosaccharide 1,2-alpha-mannosidase activity	IMP PMID:25092655 EDEM2 initiates mammalian glycoprotein ERAD by catalyzing th...	ACCEPT	Summary: Endogenous gene knockout demonstrated that EDEM3 possesses alpha-1,2-mannosidase activity, performing the second trimming step Man8B to Man7; EDEM3 has the clearest catalytic activity of the three EDEMs. Reason: Core molecular function with direct experimental (IMP) support. Supporting Evidence: PMID:25092655 Mannose trimming from Man8GlcNAc2 to Man7GlcNAc2 is performed mainly by EDEM3 and to a lesser extent by EDEM1
GO:0044322 endoplasmic reticulum quality control compartment	TAS Reactome:R-HSA-6782685	ACCEPT	Summary: Reactome curation of EDEM3 localization to the ER-derived quality control compartment (ERQC), where mannose trimming of ERAD substrates occurs. Reason: Correct compartment; consistent with EDEM3's ER residence and role in ERAD substrate trimming. Supporting Evidence: file:human/EDEM3/EDEM3-uniprot.txt SUBCELLULAR LOCATION: Endoplasmic reticulum lumen

Core Functions

Calcium-dependent alpha-1,2-mannosidase that catalyzes the downstream ER mannose-trimming step from Man8GlcNAc2 to Man7GlcNAc2 (and further toward Man5GlcNAc2 isomers), accelerating glycoprotein ERAD by generating the demannosylated glycan recognized by the downstream lectin OS-9.

Molecular Function:

mannosyl-oligosaccharide 1,2-alpha-mannosidase activity

Directly Involved In:

endoplasmic reticulum mannose trimming ERAD pathway

Cellular Locations:

endoplasmic reticulum lumen

Supporting Evidence:

PMID:25092655
Mannose trimming from Man8GlcNAc2 to Man7GlcNAc2 is performed mainly by EDEM3 and to a lesser extent by EDEM1
file:human/EDEM3/EDEM3-uniprot.txt
catalyzing mannose trimming from Man8GlcNAc2 to Man7GlcNAc2 in the N-glycans
PMID:16431915
PMID:29784879

Accelerates ubiquitin-dependent ER-associated degradation of misfolded glycoproteins by trimming their N-glycans within the gpERAD pathway, acting downstream of EDEM2 and in association with the HRD1 adaptor SEL1L.

Molecular Function:

mannosyl-oligosaccharide 1,2-alpha-mannosidase activity

Directly Involved In:

ubiquitin-dependent glycoprotein ERAD pathway

Cellular Locations:

endoplasmic reticulum lumen

Supporting Evidence:

file:human/EDEM3/EDEM3-uniprot.txt
Accelerates the glycoprotein ERAD by proteasomes
PMID:16431915

References

GO_REF:0000002

Gene Ontology annotation through association of InterPro records with GO terms

GO_REF:0000024

Manual transfer of experimentally-verified manual GO annotation data to orthologs by curator judgment of sequence similarity

GO_REF:0000033

Annotation inferences using phylogenetic trees

GO_REF:0000117

Electronic Gene Ontology annotations created by ARBA machine learning models

GO_REF:0000120

Combined Automated Annotation using Multiple IEA Methods

PMID:25092655

EDEM2 initiates mammalian glycoprotein ERAD by catalyzing the first mannose trimming step.

Endogenous EDEM3 (mainly) and EDEM1 (to a lesser extent) catalyze the second trimming step Man8B to Man7, and EDEM1/EDEM3 trim M8B to Man7-5GlcNAc2 recognized by OS-9; SEL1L binds EDEM1 and EDEM3 but not EDEM2.

PMID:16431915

EDEM3, a soluble EDEM homolog, enhances glycoprotein endoplasmic reticulum-associated degradation and mannose trimming.

EDEM3 is a 931-aa soluble Class I GH47 alpha-mannosidase homolog with a C-terminal protease-associated motif; overexpression accelerates gpERAD of misfolded alpha-1-antitrypsin NHK and TCRalpha and stimulates mannose trimming from misfolded and total glycoproteins, while the catalytic-site E147Q mutant abolishes trimming and greatly decreases ERAD enhancement, showing EDEM3 has alpha-1,2-mannosidase activity in vivo.

PMID:29784879

ER-resident protein 46 (ERp46) triggers the mannose-trimming activity of ER degradation-enhancing alpha-mannosidase-like protein 3 (EDEM3).

EDEM3 stably associates with the ER oxidoreductase ERp46 (TXNDC5) via a disulfide bond between ERp46 redox-active cysteines and the EDEM3 alpha-mannosidase domain; this redox-dependent covalent interaction is required to reconstitute EDEM3 mannose-trimming activity toward the misfolded substrate TCRalpha in vitro, coupling demannosylation to ER redox state.

PMID:33671632

EDEM3 Domains Cooperate to Perform Its Overall Cell Functioning.

EDEM3 comprises four modules - GH47 mannosidase-like, intermediate (IMD), protease-associated (PA), and intrinsically disordered (IDD) domains; the GH47 domain provides substrate binding even without mannose trimming and requires the IMD for folding, while PA and IDD domains do not affect trimming per se but modulate the ERAD turnover timing of specific misfolded clients (NHK, soluble tyrosinase mutant). EDEM3 has few stable ER interactors, consistent with transient substrate engagement.

PMID:39838427

The endoplasmic reticulum degradation-enhancing alpha-mannosidase-like protein 3 attenuates the unfolded protein response and has pro-survival and pro-viral roles in hepatoma cells and hepatocellular carcinoma patients.

EDEM3 is significantly upregulated in hepatocellular carcinoma tissues, with the highest levels in HBV-infected patients, and its expression associates with tumor progression and poor prognosis; EDEM3 overexpression attenuates the UPR and activates secretory autophagy to promote HBV production, whereas EDEM3 depletion induces ER stress and pro-apoptotic cell death.

Reactome:R-HSA-6782685

EDEM1,3 hydrolyse (GlcNAc)2 (Man)8b to (GlcNAc)2 (Man)5

file:human/EDEM3/EDEM3-uniprot.txt

UniProt entry Q9BZQ6 (EDEM3_HUMAN), ER degradation-enhancing alpha-mannosidase-like protein 3

Calcium-dependent ER lumenal GH47 alpha-1,2-mannosidase (EC 3.2.1.113) that accelerates glycoprotein ERAD by trimming Man8GlcNAc2 to Man7GlcNAc2 and further to Man5 isomers; contains a protease-associated (PA) domain; biallelic variants cause CDG2V/EDEM3-CDG.

Suggested Experiments

Experiment: Reconstitute purified EDEM3 (wild-type, catalytic-dead, and PA-domain-deleted) on defined Man8GlcNAc2 glycoprotein substrates to quantify the second-step trimming activity and the PA domain's contribution to substrate selection.

Experiment: Glycomic and substrate-degradation profiling of EDEM3-CDG patient-variant knock-in cells to determine how loss of EDEM3 mannosidase activity alters N-glycan trimming on general versus misfolded glycoproteins.

Deep Research

Falcon

(EDEM3-deep-research-falcon.md)

Research report: Functional annotation of human **EDEM3** (UniProt **Q9BZQ6**, gene **EDEM3/C1orf22**) Falcon Edison Scientific Literature 23 citations 2 artifacts 2026-06-12T03:47:24.010916

Edison artifact artifact-00 (text/markdown)

## Context ID: pqac-00000022 The requested information can be found in Figures 2 and 3 of the document. Figure 2 provides a schematic of the EDEM3 domain organi (image/png)

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.

Research report: Functional annotation of human EDEM3 (UniProt Q9BZQ6, gene EDEM3/C1orf22)

0. Target verification (critical identity check)

The UniProt accession Q9BZQ6 corresponds to human EDEM3 (ER degradation-enhancing α-mannosidase-like protein 3), an ER quality-control factor belonging to glycosyl hydrolase family 47 (GH47) and annotated as an α-1,2-mannosidase-like enzyme involved in glycoprotein ER-associated degradation (gpERAD). This matches the requested protein description and organism (Homo sapiens). (manica2021edem3domainscooperate pages 1-2, słominskawojewodzka2015theroleof pages 8-10)

1. Key concepts and definitions (current understanding)

1.1 ER quality control (ERQC), ERAD, and gpERAD

ER-associated degradation (ERAD) is a proteostasis pathway that eliminates misfolded or superfluous proteins that enter or reside in the endoplasmic reticulum (ER), by ultimately delivering them to cytosolic proteasomes via membrane-associated ubiquitination machinery. (christianson2023mechanismsofsubstrate pages 1-5)

For N-glycosylated secretory proteins, ERAD includes a glycan editing / mannose trimming component (often called glycoprotein ERAD, gpERAD) that helps distinguish folding intermediates from terminally misfolded proteins; mannose trimming produces glycan “signals” that are recognized by downstream lectin-like ERAD factors. (słominskawojewodzka2015theroleof pages 8-10, christianson2023mechanismsofsubstrate pages 1-5)

1.2 EDEM proteins

The EDEM family (EDEM1/2/3) are ER-resident α-mannosidase-like proteins that accelerate disposal of terminally misfolded glycoproteins by editing high-mannose N-glycans and promoting commitment to degradation, including facilitating release from the calnexin/calreticulin folding cycle. (słominskawojewodzka2015theroleof pages 8-10)

2. EDEM3: protein features, domains, localization, and topology

2.1 Domain architecture

Human EDEM3 is a ~931 aa soluble, multi-domain protein comprising a GH47 mannosidase-like domain followed by additional regions described as IMD (intermediate domain), PA (protease-associated) domain, and an intrinsically disordered domain (IDD). A schematic domain organization and construct map are shown in Manica et al. (2021) (Figures 2–3). (manica2021edem3domainscooperate pages 1-2, manica2021edem3domainscooperate media 1872ca8d, manica2021edem3domainscooperate media 5202115c)

2.2 ER localization and retention

EDEM3 is described as a soluble ER luminal protein and contains a C-terminal KDEL ER-retention motif, consistent with ER residency. (manica2021edem3domainscooperate pages 1-2)

3. Primary molecular function: enzymatic reaction and substrate specificity

3.1 Enzymatic class

EDEM3 is a GH47 class I α-1,2-mannosidase-like protein with experimentally supported in vivo α1,2-mannosidase activity, supported by catalytic-site mutagenesis: the E147Q substitution (mutation of a conserved acidic residue required for catalysis in GH47 enzymes) abolishes EDEM3-driven mannose trimming and substantially reduces its ERAD-enhancing function. (hirao2006edem3asoluble pages 1-1, słominskawojewodzka2015theroleof pages 8-10)

3.2 Substrate context

Experimental studies position EDEM3’s functional substrates as misfolded N-glycosylated proteins in the ER, including model gpERAD clients such as TCRα, α1-antitrypsin NHK, and α1-antitrypsin Z (ATZ). (hirao2006edem3asoluble pages 1-1, yu2018erresidentprotein46 pages 13-15)

3.3 Glycan processing detail (branch/isomer specificity)

Yu et al. (2018) describe EDEM3-mediated mannose trimming using oligomannose glycan notations (e.g., M9, M8B, Man7A), and report a specific step in which trimming yields Man7GlcNAc2 isomer A (M7A) by removal of a terminal mannose from M8B (branch C trimming described in the paper’s framing). (yu2018erresidentprotein46 pages 1-2)

3.4 Practical limitation (what is not yet well quantified)

Across the retrieved literature, EDEM3 function is well-supported qualitatively (substrate classes and pathway role), but the retrieved excerpts do not provide robust enzyme kinetic constants (e.g., kcat/KM) for purified human EDEM3 on defined glycan substrates; activity appears context-dependent and difficult to reconstitute without accessory factors. (yu2018erresidentprotein46 pages 1-2, yu2018erresidentprotein46 pages 13-15)

4. Mechanism in ERAD: interaction partners and redox regulation

4.1 ERp46/TXNDC5 as a key EDEM3 activator

A central mechanistic advance is that EDEM3’s mannose trimming can be triggered by the ER oxidoreductase ERp46 (TXNDC5).

Yu et al. (2018, JBC; publication month July 2018) show EDEM3 stably associates with ERp46 in cells (co-immunoprecipitation), and ERp46 co-expression enhances EDEM3’s mannose trimming in vivo. (yu2018erresidentprotein46 pages 13-15)
In a defined in vitro system, EDEM3 mannose trimming toward a misfolded glycoprotein substrate (TCRα) was reconstituted only when ERp46 formed a covalent disulfide-linked interaction with EDEM3, and this depended on ERp46 redox activity. (yu2018erresidentprotein46 pages 1-2)

These findings support a model where EDEM3 is not simply “on” as a constitutively active hydrolase; instead, its demannosylation function is coupled to ER redox chemistry, aligning mannose trimming with the misfolded state and its oxidative folding context. (yu2018erresidentprotein46 pages 1-2)

4.2 Broader interactome: transient substrate engagement

Proteomics-based analysis in Manica et al. (2021; publication month Feb 2021) suggests EDEM3 has few stable ER interactors (consistent with transient engagement of many clients), with detected associations including ERAD/ERQC-linked proteins such as SEL1L and BiP/HSPA5 in their co-IP/proteomics workflows. (manica2021edem3domainscooperate pages 2-4, manica2021edem3domainscooperate pages 1-2)

5. Biological processes and pathway placement

5.1 Placement within sequential mannose trimming logic

Manica et al. (2021) frame EDEM2 as initiating an early mannose trimming step, followed by EDEM3 action in sequential processing of glycans that commit misfolded glycoproteins to ERAD. (manica2021edem3domainscooperate pages 1-2)

5.2 Domain-level functional analysis (substrate handling and ERAD timing)

Using EDEM3 knockout cells and reconstitution with domain deletions, Manica et al. (2021) conclude:
* the GH47 mannosidase-like domain mediates substrate binding and is required for catalytic activity,
* the IMD supports proper folding of the mannosidase region,
* PA and IDD domains modulate the turnover of specific misfolded clients (e.g., NHK and soluble tyrosinase mutant), shaping ERAD timing and client selectivity rather than simply switching catalysis on/off. (manica2021edem3domainscooperate pages 1-2, manica2021edem3domainscooperate pages 14-15)

A figure-level schematic of EDEM3 domains and the deletion constructs used to reach these conclusions is shown in Manica et al. (2021) Figures 2–3. (manica2021edem3domainscooperate media 1872ca8d, manica2021edem3domainscooperate media 5202115c)

6. Recent developments (prioritizing 2023–2024)

6.1 Updated authoritative synthesis of ERAD mechanisms (2023)

A 2023 authoritative review in Nature Reviews Molecular Cell Biology emphasizes that ERAD is not a single pathway but a collection of routes with specialized recognition and processing logic for diverse substrate topologies and maturation states, providing the conceptual framework into which glycan editing enzymes like EDEM3 fit (substrate discrimination and route specialization). Publication date: Aug 2023. URL: https://doi.org/10.1038/s41580-023-00633-8 (christianson2023mechanismsofsubstrate pages 1-5)

6.2 Human genetics connects EDEM3 to glucose homeostasis (2023)

Lagou et al. performed a large cross-ancestry GWAS of random glucose (RG) in 476,326 individuals without diabetes (published online 7 Sep 2023, Nature Genetics). The study reports that the EDEM3 locus is represented by a low-frequency (1% ≤ MAF < 5%) coding variant association with RG, nominating EDEM3 as a plausible contributor to glucose homeostasis. URL: https://doi.org/10.1038/s41588-023-01462-3 (lagou2023gwasofrandom pages 1-2)

6.3 ER folding–degradation “tug-of-war” models incorporating EDEM activity (2024)

A 2024 study by Ninagawa et al. (posted Oct 19, 2023 as a preprint; later version in eLife per metadata) advances the concept that glycoprotein fate in the ER can be conceptualized as a tug-of-war between folding-promoting pathways (UGGT-dependent reglucosylation and CNX/CRT cycle) and degradation-promoting pathways (EDEM-family demannosylation). While the excerpt focuses on UGGT genetics, it explicitly frames EDEM-family activity as the degradation arm of this competition model. URL: https://doi.org/10.1101/2023.10.18.562958 (ninagawa2024uggt1mediatedreglucosylationof pages 1-5)

7. Current applications and real-world implementations

7.1 Research and biotechnology applications

Because EDEM-family α1,2-mannosidases influence high-mannose glycan processing and ER quality control decisions, manipulating this axis is widely used in cell-based models to:
* tune secretion versus degradation of recombinant glycoproteins,
* interrogate ER stress/UPR dynamics,
* map gpERAD client pathways (e.g., using NHK/ATZ/TCRα as model clients). (hirao2006edem3asoluble pages 1-1, yu2018erresidentprotein46 pages 13-15, ninagawa2024uggt1mediatedreglucosylationof pages 1-5)

7.2 Translational relevance: ERAD modulation in cancer

A cancer-focused review discusses ERQC/ERAD as an actionable vulnerability in cancer (for late ERAD steps, some inhibitors are already in clinical use for specific cancers), and it notes Human Protein Atlas–based associations in which EDEM3 overexpression is linked to unfavorable prognosis in renal cancers (observational/prognostic context rather than mechanism). URL: https://doi.org/10.1155/2019/8384913 (OpenTargets Search: -EDEM3)

8. Disease associations and statistics (from recent/authoritative sources)

8.1 Database-curated human disease links (Open Targets)

Open Targets reports curated disease associations for EDEM3 (ENSG00000116406), including:
* Congenital disorder of glycosylation (CDG) and CDG type 2V, with relatively high association scores (~0.77), supported by multiple evidence items (including literature linked by Open Targets). URL: https://platform.opentargets.org/target/ENSG00000116406 (OpenTargets Search: -EDEM3)
* Additional phenotype/disease terms with weaker scores (~0.31–0.32) including short stature, bronchiectasis, and systemic lupus erythematosus (these should be interpreted cautiously as aggregated evidence signals, not definitive mechanism). (OpenTargets Search: -EDEM3)

8.2 HBV/HCC context (recent primary evidence; 2025, outside 2023–2024 but highly relevant)

Ghionescu et al. (Journal of Biomedical Science; 2025, DOI minted 2024) report elevated EDEM3 expression in hepatocellular carcinoma (HCC) tissues, with the highest levels in HBV-infected tumors, and provide mechanistic cell data: EDEM3 overexpression attenuates UPR and activates secretory autophagy promoting HBV production, while EDEM3 depletion increases ER stress and pro-apoptotic mechanisms. URL: https://doi.org/10.1186/s12929-024-01103-9 (ghionescu2025theendoplasmicreticulum pages 1-2)

9. Expert synthesis and interpretation (authoritative analysis)

Collectively, the strongest experimental support indicates EDEM3 functions as a regulated GH47 demannosylase/lectin-like factor that couples glycan trimming to ER redox state, thereby helping commit misfolded glycoproteins to gpERAD.

A key mechanistic insight is that EDEM3 activity is functionally gated by oxidoreductase partnership (ERp46/TXNDC5), suggesting the ER integrates glycan signals and disulfide/redox status when deciding whether to continue folding attempts or send a client to degradation. (yu2018erresidentprotein46 pages 1-2, yu2018erresidentprotein46 pages 13-15)

Summary table (evidence map)

The following table provides a compact, claim-to-citation mapping for EDEM3 functional annotation.

Topic	Claim	Evidence type	Key citation (year)	DOI / URL	Context ID(s)
Identity / target verification	Human EDEM3 corresponds to UniProt Q9BZQ6; aliases include C1orf22 and the protein is ER degradation-enhancing alpha-mannosidase-like protein 3, a GH47-family EDEM protein involved in ERAD.	Primary, review, database	Olivari et al. 2005; Manica et al. 2021; Open Targets	https://doi.org/10.1074/jbc.c400534200 ; https://doi.org/10.3390/ijms22042172 ; https://platform.opentargets.org/target/ENSG00000116406	(manica2021edem3domainscooperate pages 1-2, OpenTargets Search: -EDEM3)
Domains and motifs	EDEM3 is a 931 aa soluble ER protein with four modules: GH47 mannosidase-like domain, IMD (intermediate) domain, PA (protease-associated) domain, IDD (intrinsically disordered domain), plus a C-terminal KDEL ER-retention motif. Figure-based domain schematic explicitly shows these modules and KDEL.	Primary, figure evidence	Manica et al. 2021	https://doi.org/10.3390/ijms22042172	(manica2021edem3domainscooperate pages 1-2, manica2021edem3domainscooperate media 1872ca8d)
Localization / topology	EDEM3 is described as a soluble ER luminal / ER-localized protein retained by KDEL, rather than a membrane-anchored ERAD factor.	Primary, review	Hirao et al. 2006; Manica et al. 2021	https://doi.org/10.1074/jbc.m512191200 ; https://doi.org/10.3390/ijms22042172	(hirao2006edem3asoluble pages 1-3, manica2021edem3domainscooperate pages 1-2)
Enzyme class / catalytic function	EDEM3 is a GH47 class I α1,2-mannosidase-like enzyme; overexpression stimulates mannose trimming, and catalytic-site mutation E147Q abolishes trimming and markedly reduces ERAD enhancement, supporting bona fide α1,2-mannosidase activity in vivo. UniProt annotates EC 3.2.1.113.	Primary, review, database	Hirao et al. 2006; Słomińska-Wojewódzka & Sandvig 2015; UniProt-derived target description	https://doi.org/10.1074/jbc.m512191200 ; https://doi.org/10.3390/molecules20069816 ; https://www.uniprot.org/uniprotkb/Q9BZQ6	(hirao2006edem3asoluble pages 1-1, słominskawojewodzka2015theroleof pages 8-10)
Glycan substrates / processing step	EDEM3 acts on N-linked high-mannose glycans on misfolded glycoproteins in ER quality control. It participates after EDEM2 in sequential mannose trimming and contributes to formation of ERAD-targeting glycans; reviews place EDEM-mediated trimming in generation of signals recognized by downstream lectins.	Primary, review	Manica et al. 2021; Christianson et al. 2023	https://doi.org/10.3390/ijms22042172 ; https://doi.org/10.1038/s41580-023-00633-8	(manica2021edem3domainscooperate pages 1-2, christianson2023mechanismsofsubstrate pages 1-5)
Branch specificity / reaction detail	Primary biochemical work indicates EDEM3-mediated trimming can convert M8B to M7A by removing a terminal mannose from branch C, but activity is weak on purified free glycans and much more effective on misfolded glycoprotein substrates in cells or reconstituted systems.	Primary	Yu et al. 2018	https://doi.org/10.1074/jbc.ra118.003129	(yu2018erresidentprotein46 pages 1-2)
Model substrates	Experimentally supported glycoprotein substrates/clients used to study EDEM3 include TCRα, α1-antitrypsin NHK, ATZ, soluble tyrosinase mutant, and other misfolded N-glycoproteins.	Primary	Hirao et al. 2006; Yu et al. 2018; Manica et al. 2021	https://doi.org/10.1074/jbc.m512191200 ; https://doi.org/10.1074/jbc.ra118.003129 ; https://doi.org/10.3390/ijms22042172	(hirao2006edem3asoluble pages 1-1, yu2018erresidentprotein46 pages 13-15, manica2021edem3domainscooperate pages 14-15)
Interaction partners	ERp46/TXNDC5 is the best-supported functional partner: it stably associates with EDEM3 and triggers EDEM3 mannose-trimming activity through a redox-dependent covalent interaction. Proteomics also identified few stable partners, including SEL1L, BiP/HSPA5, DNAJB9, UFD1, consistent with mainly transient substrate interactions.	Primary	Yu et al. 2018; Manica et al. 2021	https://doi.org/10.1074/jbc.ra118.003129 ; https://doi.org/10.3390/ijms22042172	(yu2018erresidentprotein46 pages 13-15, manica2021edem3domainscooperate pages 2-4, manica2021edem3domainscooperate pages 1-2)
Redox regulation	EDEM3 enzymatic function is linked to ER redox chemistry: ERp46 redox-active cysteines form a disulfide-linked complex with the EDEM3 mannosidase domain, enabling reconstitution of trimming activity toward misfolded TCRα in vitro.	Primary	Yu et al. 2018	https://doi.org/10.1074/jbc.ra118.003129	(yu2018erresidentprotein46 pages 1-2)
Pathway role in gpERAD	EDEM3 functions in glycoprotein ER-associated degradation (gpERAD) by recognizing misfolded glycoproteins, trimming their mannose residues, helping terminate futile calnexin/calreticulin folding cycles, and promoting commitment to degradation.	Primary, review	Hirao et al. 2006; Słomińska-Wojewódzka & Sandvig 2015; Christianson et al. 2023	https://doi.org/10.1074/jbc.m512191200 ; https://doi.org/10.3390/molecules20069816 ; https://doi.org/10.1038/s41580-023-00633-8	(hirao2006edem3asoluble pages 1-1, słominskawojewodzka2015theroleof pages 8-10, christianson2023mechanismsofsubstrate pages 1-5)
Domain-specific functional interpretation	The GH47 domain is sufficient for substrate binding but requires IMD for proper folding; PA and IDD are not essential for trimming per se but modulate turnover kinetics of specific substrates, implying EDEM3 influences ERAD timing and client selectivity.	Primary	Manica et al. 2021	https://doi.org/10.3390/ijms22042172	(manica2021edem3domainscooperate pages 1-2, manica2021edem3domainscooperate pages 14-15)
Structural/biophysical behavior	EDEM3 sediments in fractions consistent with roughly 120–250 kDa species, compatible with homo-/hetero-dimeric assemblies; its interactome is relatively sparse compared with EDEM1, supporting a model of transient client engagement.	Primary	Manica et al. 2021	https://doi.org/10.3390/ijms22042172	(manica2021edem3domainscooperate pages 2-4, manica2021edem3domainscooperate pages 14-15)
Recent mechanistic context (2023–2024)	Recent ERAD literature emphasizes that glycoprotein fate reflects a tug-of-war between folding (UGGT/CNX-CRT cycle) and degradation (EDEM-mediated demannosylation); EDEM3 is part of this decision module in current models of mammalian ER quality control.	Review / primary preprint	Christianson et al. 2023; Ninagawa et al. 2024	https://doi.org/10.1038/s41580-023-00633-8 ; https://doi.org/10.1101/2023.10.18.562958	(christianson2023mechanismsofsubstrate pages 1-5, ninagawa2024uggt1mediatedreglucosylationof pages 1-5)
Disease association: congenital disorder of glycosylation	Open Targets links EDEM3 to congenital disorder of glycosylation and specifically CDG type 2V, with a relatively high association score (~0.774 for CDG and ~0.767 for CDG type 2V) based on curated evidence.	Database / genetics curation	Open Targets	https://platform.opentargets.org/target/ENSG00000116406	(OpenTargets Search: -EDEM3)
Disease association: other phenotype terms	Open Targets also lists evidence linking EDEM3 to short stature, bronchiectasis, and systemic lupus erythematosus, though these associations are weaker (scores ~0.31–0.32) and should be interpreted more cautiously than the CDG association.	Database	Open Targets	https://platform.opentargets.org/target/ENSG00000116406	(OpenTargets Search: -EDEM3)
Disease association: HBV/HCC	In hepatocellular carcinoma studies, EDEM3 is reported as upregulated in HCC tissues, highest in HBV-infected tumors; mechanistically, EDEM3 overexpression attenuated UPR and promoted secretory autophagy/HBV production, whereas depletion increased ER stress and apoptosis.	Primary	Ghionescu et al. 2025	https://doi.org/10.1186/s12929-024-01103-9	(ghionescu2025theendoplasmicreticulum pages 1-2)
Disease association: cancer prognosis	Review literature cites Human Protein Atlas-based observations that high EDEM3 expression is associated with unfavorable prognosis in renal cancers, supporting broader relevance of ERQC/ERAD adaptation in malignancy.	Review	Tax et al. 2019	https://doi.org/10.1155/2019/8384913	(OpenTargets Search: -EDEM3)
Human genetics / metabolic trait association	A large multi-ancestry random glucose GWAS in 476,326 individuals identified EDEM3 as a locus with a low-frequency coding variant associated with glucose regulation, nominating EDEM3 as a plausible glucose-homeostasis gene.	Primary genetics	Lagou et al. 2023	https://doi.org/10.1038/s41588-023-01462-3	(lagou2023gwasofrandom pages 1-2)

Table: This table summarizes the main experimentally supported and clinically relevant features of human EDEM3/Q9BZQ6, including identity, domain organization, ER localization, catalytic role in gpERAD, interaction partners, and disease or genetics associations. It is designed as a compact citation map for use in a full research report.

Key figure evidence (domain architecture)

Manica et al. (2021) includes a schematic of EDEM3 domain organization (GH47/IMD/PA/IDD and KDEL) and the deletion constructs used for functional dissection. (manica2021edem3domainscooperate media 1872ca8d, manica2021edem3domainscooperate media 5202115c)

References (URLs and publication dates highlighted where available)

Hirao K. et al. EDEM3, a Soluble EDEM Homolog, Enhances Glycoprotein ERAD and Mannose Trimming. J Biol Chem. Apr 2006. https://doi.org/10.1074/jbc.m512191200 (hirao2006edem3asoluble pages 1-1, hirao2006edem3asoluble pages 1-3)
Yu S. et al. ERp46 triggers the mannose-trimming activity of EDEM3. J Biol Chem. Jul 2018. https://doi.org/10.1074/jbc.ra118.003129 (yu2018erresidentprotein46 pages 1-2, yu2018erresidentprotein46 pages 13-15)
Manica G. et al. EDEM3 Domains Cooperate to Perform Its Overall Cell Functioning. Int J Mol Sci. Feb 2021. https://doi.org/10.3390/ijms22042172 (manica2021edem3domainscooperate pages 1-2, manica2021edem3domainscooperate media 1872ca8d, manica2021edem3domainscooperate media 5202115c)
Słomińska-Wojewódzka M., Sandvig K. Lectin–carbohydrate interactions in ERAD (EDEM-focused review). Molecules. May 2015. https://doi.org/10.3390/molecules20069816 (słominskawojewodzka2015theroleof pages 8-10)
Christianson J.C. et al. Mechanisms of substrate processing during ERAD. Nat Rev Mol Cell Biol. Aug 2023. https://doi.org/10.1038/s41580-023-00633-8 (christianson2023mechanismsofsubstrate pages 1-5)
Lagou V. et al. GWAS of random glucose in 476,326 individuals. Nat Genet. Published online 7 Sep 2023. https://doi.org/10.1038/s41588-023-01462-3 (lagou2023gwasofrandom pages 1-2)
Ninagawa S. et al. UGGT1/2-mediated reglucosylation competes with ERAD of misfolded glycoproteins. bioRxiv posted 19 Oct 2023 (later eLife per metadata). https://doi.org/10.1101/2023.10.18.562958 (ninagawa2024uggt1mediatedreglucosylationof pages 1-5)
Open Targets Platform: EDEM3 target page (ENSG00000116406). Access via https://platform.opentargets.org/target/ENSG00000116406 (OpenTargets Search: -EDEM3)

References

(manica2021edem3domainscooperate pages 1-2): Georgiana Manica, Simona Ghenea, Cristian V. A. Munteanu, Eliza C. Martin, Cristian Butnaru, Marius Surleac, Gabriela N. Chiritoiu, Petruta R. Alexandru, Andrei-Jose Petrescu, and Stefana M. Petrescu. Edem3 domains cooperate to perform its overall cell functioning. International Journal of Molecular Sciences, 22:2172, Feb 2021. URL: https://doi.org/10.3390/ijms22042172, doi:10.3390/ijms22042172. This article has 17 citations.
(słominskawojewodzka2015theroleof pages 8-10): Monika Słomińska-Wojewódzka and Kirsten Sandvig. The role of lectin-carbohydrate interactions in the regulation of er-associated protein degradation. Molecules, 20:9816-9846, May 2015. URL: https://doi.org/10.3390/molecules20069816, doi:10.3390/molecules20069816. This article has 63 citations.
(christianson2023mechanismsofsubstrate pages 1-5): John C. Christianson, Ernst Jarosch, and Thomas Sommer. Mechanisms of substrate processing during er-associated protein degradation. Nature Reviews Molecular Cell Biology, 24:777-796, Aug 2023. URL: https://doi.org/10.1038/s41580-023-00633-8, doi:10.1038/s41580-023-00633-8. This article has 189 citations and is from a domain leading peer-reviewed journal.
(manica2021edem3domainscooperate media 1872ca8d): Georgiana Manica, Simona Ghenea, Cristian V. A. Munteanu, Eliza C. Martin, Cristian Butnaru, Marius Surleac, Gabriela N. Chiritoiu, Petruta R. Alexandru, Andrei-Jose Petrescu, and Stefana M. Petrescu. Edem3 domains cooperate to perform its overall cell functioning. International Journal of Molecular Sciences, 22:2172, Feb 2021. URL: https://doi.org/10.3390/ijms22042172, doi:10.3390/ijms22042172. This article has 17 citations.
(manica2021edem3domainscooperate media 5202115c): Georgiana Manica, Simona Ghenea, Cristian V. A. Munteanu, Eliza C. Martin, Cristian Butnaru, Marius Surleac, Gabriela N. Chiritoiu, Petruta R. Alexandru, Andrei-Jose Petrescu, and Stefana M. Petrescu. Edem3 domains cooperate to perform its overall cell functioning. International Journal of Molecular Sciences, 22:2172, Feb 2021. URL: https://doi.org/10.3390/ijms22042172, doi:10.3390/ijms22042172. This article has 17 citations.
(hirao2006edem3asoluble pages 1-1): Kazuyoshi Hirao, Yuko Natsuka, Taku Tamura, Ikuo Wada, Daisuke Morito, Shunji Natsuka, Pedro Romero, Barry Sleno, Linda O. Tremblay, Annette Herscovics, Kazuhiro Nagata, and Nobuko Hosokawa. Edem3, a soluble edem homolog, enhances glycoprotein endoplasmic reticulum-associated degradation and mannose trimming*. Journal of Biological Chemistry, 281:9650-9658, Apr 2006. URL: https://doi.org/10.1074/jbc.m512191200, doi:10.1074/jbc.m512191200. This article has 315 citations and is from a domain leading peer-reviewed journal.
(yu2018erresidentprotein46 pages 13-15): Shangyu Yu, Shinji Ito, Ikuo Wada, and Nobuko Hosokawa. Er-resident protein 46 (erp46) triggers the mannose-trimming activity of er degradation–enhancing α-mannosidase–like protein 3 (edem3). Journal of Biological Chemistry, 293:10663-10674, Jul 2018. URL: https://doi.org/10.1074/jbc.ra118.003129, doi:10.1074/jbc.ra118.003129. This article has 51 citations and is from a domain leading peer-reviewed journal.
(yu2018erresidentprotein46 pages 1-2): Shangyu Yu, Shinji Ito, Ikuo Wada, and Nobuko Hosokawa. Er-resident protein 46 (erp46) triggers the mannose-trimming activity of er degradation–enhancing α-mannosidase–like protein 3 (edem3). Journal of Biological Chemistry, 293:10663-10674, Jul 2018. URL: https://doi.org/10.1074/jbc.ra118.003129, doi:10.1074/jbc.ra118.003129. This article has 51 citations and is from a domain leading peer-reviewed journal.
(manica2021edem3domainscooperate pages 2-4): Georgiana Manica, Simona Ghenea, Cristian V. A. Munteanu, Eliza C. Martin, Cristian Butnaru, Marius Surleac, Gabriela N. Chiritoiu, Petruta R. Alexandru, Andrei-Jose Petrescu, and Stefana M. Petrescu. Edem3 domains cooperate to perform its overall cell functioning. International Journal of Molecular Sciences, 22:2172, Feb 2021. URL: https://doi.org/10.3390/ijms22042172, doi:10.3390/ijms22042172. This article has 17 citations.
(manica2021edem3domainscooperate pages 14-15): Georgiana Manica, Simona Ghenea, Cristian V. A. Munteanu, Eliza C. Martin, Cristian Butnaru, Marius Surleac, Gabriela N. Chiritoiu, Petruta R. Alexandru, Andrei-Jose Petrescu, and Stefana M. Petrescu. Edem3 domains cooperate to perform its overall cell functioning. International Journal of Molecular Sciences, 22:2172, Feb 2021. URL: https://doi.org/10.3390/ijms22042172, doi:10.3390/ijms22042172. This article has 17 citations.
(lagou2023gwasofrandom pages 1-2): Vasiliki Lagou, Longda Jiang, Anna Ulrich, Liudmila Zudina, Karla Sofia Gutiérrez González, Zhanna Balkhiyarova, Alessia Faggian, Jared G. Maina, Shiqian Chen, Petar V. Todorov, Sodbo Sharapov, Alessia David, Letizia Marullo, Reedik Mägi, Roxana-Maria Rujan, Emma Ahlqvist, Gudmar Thorleifsson, Ηe Gao, Εvangelos Εvangelou, Beben Benyamin, Robert A. Scott, Aaron Isaacs, Jing Hua Zhao, Sara M. Willems, Toby Johnson, Christian Gieger, Harald Grallert, Christa Meisinger, Martina Müller-Nurasyid, Rona J. Strawbridge, Anuj Goel, Denis Rybin, Eva Albrecht, Anne U. Jackson, Heather M. Stringham, Ivan R. Corrêa, Eric Farber-Eger, Valgerdur Steinthorsdottir, André G. Uitterlinden, Patricia B. Munroe, Morris J. Brown, Julian Schmidberger, Oddgeir Holmen, Barbara Thorand, Kristian Hveem, Tom Wilsgaard, Karen L. Mohlke, Zhe Wang, Marcel den Hoed, Aleksey Shmeliov, Marcel den Hoed, Ruth J. F. Loos, Wolfgang Kratzer, Mark Haenle, Wolfgang Koenig, Bernhard O. Boehm, Tricia M. Tan, Alejandra Tomas, Victoria Salem, Inês Barroso, Jaakko Tuomilehto, Michael Boehnke, Jose C. Florez, Anders Hamsten, Hugh Watkins, Inger Njølstad, H.-Erich Wichmann, Mark J. Caulfield, Kay-Tee Khaw, Cornelia M. van Duijn, Albert Hofman, Nicholas J. Wareham, Claudia Langenberg, John B. Whitfield, Nicholas G. Martin, Grant Montgomery, Chiara Scapoli, Ioanna Tzoulaki, Paul Elliott, Unnur Thorsteinsdottir, Kari Stefansson, Evan L. Brittain, Mark I. McCarthy, Philippe Froguel, Patrick M. Sexton, Denise Wootten, Leif Groop, Josée Dupuis, James B. Meigs, Giuseppe Deganutti, Ayse Demirkan, Tune H. Pers, Christopher A. Reynolds, Yurii S. Aulchenko, Marika A. Kaakinen, Ben Jones, Inga Prokopenko, and Cornelia M. van Duijn. Gwas of random glucose in 476,326 individuals provide insights into diabetes pathophysiology, complications and treatment stratification. Nature Genetics, 55:1448-1461, Sep 2023. URL: https://doi.org/10.1038/s41588-023-01462-3, doi:10.1038/s41588-023-01462-3. This article has 118 citations and is from a highest quality peer-reviewed journal.
(ninagawa2024uggt1mediatedreglucosylationof pages 1-5): Satoshi Ninagawa, Masaki Matsuo, Deng Ying, Shuichiro Oshita, Shinya Aso, Kazutoshi Matsushita, Mai Taniguchi, Akane Fueki, Moe Yamashiro, Kaoru Sugasawa, Shunsuke Saito, Koshi Imami, Yasuhiko Kizuka, Tetsushi Sakuma, Takashi Yamamoto, Hirokazu Yagi, Koichi Kato, and Kazutoshi Mori. Uggt1-mediated reglucosylation of n-glycan competes with er-associated degradation of unstable and misfolded glycoproteins. eLife, Sep 2024. URL: https://doi.org/10.1101/2023.10.18.562958, doi:10.1101/2023.10.18.562958. This article has 7 citations and is from a domain leading peer-reviewed journal.
(OpenTargets Search: -EDEM3): Open Targets Query (-EDEM3, 5 results). Buniello, A. et al. (2025). Open Targets Platform: facilitating therapeutic hypotheses building in drug discovery. Nucleic Acids Research.
(ghionescu2025theendoplasmicreticulum pages 1-2): Alina-Veronica Ghionescu, Mihaela Uta, Andrei Sorop, Catalin Lazar, Petruta R. Flintoaca-Alexandru, Gabriela Chiritoiu, Livia Sima, Stefana-Maria Petrescu, Simona Olimpia Dima, and Norica Branza-Nichita. The endoplasmic reticulum degradation-enhancing α-mannosidase-like protein 3 attenuates the unfolded protein response and has pro-survival and pro-viral roles in hepatoma cells and hepatocellular carcinoma patients. Journal of Biomedical Science, Jan 2025. URL: https://doi.org/10.1186/s12929-024-01103-9, doi:10.1186/s12929-024-01103-9. This article has 4 citations and is from a domain leading peer-reviewed journal.
(hirao2006edem3asoluble pages 1-3): Kazuyoshi Hirao, Yuko Natsuka, Taku Tamura, Ikuo Wada, Daisuke Morito, Shunji Natsuka, Pedro Romero, Barry Sleno, Linda O. Tremblay, Annette Herscovics, Kazuhiro Nagata, and Nobuko Hosokawa. Edem3, a soluble edem homolog, enhances glycoprotein endoplasmic reticulum-associated degradation and mannose trimming*. Journal of Biological Chemistry, 281:9650-9658, Apr 2006. URL: https://doi.org/10.1074/jbc.m512191200, doi:10.1074/jbc.m512191200. This article has 315 citations and is from a domain leading peer-reviewed journal.

Artifacts

Edison artifact artifact-00

Citations

christianson2023mechanismsofsubstrate pages 1-5
lagou2023gwasofrandom pages 1-2
ghionescu2025theendoplasmicreticulum pages 1-2
https://doi.org/10.1038/s41580-023-00633-8
https://doi.org/10.1038/s41588-023-01462-3
https://doi.org/10.1101/2023.10.18.562958
https://doi.org/10.1155/2019/8384913
https://platform.opentargets.org/target/ENSG00000116406
https://doi.org/10.1186/s12929-024-01103-9
https://doi.org/10.1074/jbc.c400534200
https://doi.org/10.3390/ijms22042172
https://doi.org/10.1074/jbc.m512191200
https://doi.org/10.3390/molecules20069816
https://www.uniprot.org/uniprotkb/Q9BZQ6
https://doi.org/10.1074/jbc.ra118.003129
https://doi.org/10.3390/ijms22042172,
https://doi.org/10.3390/molecules20069816,
https://doi.org/10.1038/s41580-023-00633-8,
https://doi.org/10.1074/jbc.m512191200,
https://doi.org/10.1074/jbc.ra118.003129,
https://doi.org/10.1038/s41588-023-01462-3,
https://doi.org/10.1101/2023.10.18.562958,
https://doi.org/10.1186/s12929-024-01103-9,

📚 Additional Documentation

Notes

(EDEM3-notes.md)

EDEM3 (Q9BZQ6) review notes

Identity

ER degradation-enhancing alpha-mannosidase-like protein 3. ER lumenal protein (signal peptide; PROSITE PRU10138 ER retention). GH47 family (EDEM1/2/3). Contains a protease-associated (PA) domain of unknown function (distinguishes EDEM3 from EDEM1/2). EC 3.2.1.113.

Function (synthesis)

EDEM3 is an active alpha-1,2-mannosidase that accelerates glycoprotein ERAD by catalyzing mannose trimming from Man8GlcNAc2 to Man7GlcNAc2 (the second/downstream trimming step), and further to Man5 isomers [UniProt FUNCTION "Accelerates the glycoprotein ERAD by proteasomes, by catalyzing mannose trimming from Man8GlcNAc2 to Man7GlcNAc2 in the N-glycans (PubMed:25092655)"; CATALYTIC ACTIVITY RHEA:56008 (M9 isomer 9A1,2,3B1,2,3 -> M5A1,2 + 4 mannose) and RHEA:56028 (M8 -> M5 + 3 mannose), EC=3.2.1.113].
Endogenous KO analysis: EDEM3 (mainly) and EDEM1 (to a lesser extent) perform the second trimming step Man8B->Man7 [PMID:25092655 "Mannose trimming from Man8GlcNAc2 to Man7GlcNAc2 is performed mainly by EDEM3 and to a lesser extent by EDEM1"; "M8B is trimmed by EDEM1 and EDEM3 to Man7-5GlcNAc2, which are recognized by lectin OS-9"]. EDEM3 acts downstream of EDEM2.
Unlike EDEM2, EDEM3 (with EDEM1) binds SEL1L PMID:25092655.
May also trim N-glycans on all glycoproteins, not just misfolded ERAD substrates [UniProt FUNCTION "May also participate in mannose trimming from all glycoproteins and not just misfolded ones targeted to ERAD (PubMed:34143952)"].
Disease: biallelic variants cause Congenital disorder of glycosylation 2V (CDG2V/EDEM3-CDG), autosomal recessive neurodevelopmental delay [UniProt DISEASE; PMID:34143952, not cached but recorded in UniProt].
Calcium cofactor (Ca2+) required (GH47 fold) [UniProt COFACTOR].

Localization

ER lumen [UniProt SUBCELLULAR LOCATION; IEA]. ER [IEA].

Annotation review decisions

GO:0004571 mannosyl-oligosaccharide 1,2-alpha-mannosidase activity: CORE. IBA, IEA (with EC 3.2.1.113/RHEA), TAS Reactome, ISS, IMP (PMID:25092655) — all ACCEPT. EDEM3 has the strongest/clearest catalytic activity of the three EDEMs (no NOT annotation). Core MF.
GO:1904380 ER mannose trimming: IMP (PMID:25092655) ACCEPT core; IEA ACCEPT.
GO:0036503 ERAD pathway: IMP (PMID:25092655) ACCEPT core; IEA ACCEPT.
GO:1904382 mannose trimming involved in glycoprotein ERAD pathway (TAS Reactome): ACCEPT core.
GO:0097466 ubiquitin-dependent glycoprotein ERAD pathway (IBA): ACCEPT, specific/correct.
GO:0006516 glycoprotein catabolic process (IEA ARBA): correct but generic parent of gpERAD; KEEP_AS_NON_CORE / could MARK_AS_OVER_ANNOTATED. Use ACCEPT-adjacent: it is reasonably specific (glycoprotein catabolism) -> KEEP_AS_NON_CORE.
GO:0030968 ER unfolded protein response (IBA): UPR-induced effector acting in ERAD; KEEP_AS_NON_CORE.
GO:0005509 calcium ion binding (IEA): GH47 cofactor; KEEP_AS_NON_CORE.
GO:0005788 ER lumen (IEA), GO:0005783 ER (IEA): ACCEPT.
GO:0044322 ERQC (TAS Reactome): ACCEPT.
GO:0005975 carbohydrate metabolic process (IEA), GO:0016020 membrane (IEA): over-general/inaccurate (EDEM3 is luminal, not membrane) -> MARK_AS_OVER_ANNOTATED.

Falcon deep-research findings (incorporated 2026-06)

Hirao et al. 2006 (JBC) is the original EDEM3 characterization (was previously only referenced via UniProt): EDEM3 is a 931-aa soluble Class I GH47 alpha-mannosidase homolog with a C-terminal protease-associated (PA) motif; overexpression accelerates gpERAD of misfolded A1AT-NHK and TCRalpha and stimulates mannose trimming from misfolded AND total glycoproteins; the catalytic E147Q mutant abolishes trimming and decreases ERAD enhancement, proving in vivo alpha-1,2-mannosidase activity PMID:16431915. Notably distinguishes EDEM3 from EDEM (EDEM1) "which has no apparent alpha1,2-mannosidase activity."
Yu et al. 2018 (JBC): the ER oxidoreductase ERp46 (TXNDC5) triggers EDEM3 mannose-trimming activity. ERp46 stably associates with EDEM3 via a disulfide bond between ERp46 redox-active cysteines and the EDEM3 alpha-mannosidase domain; this redox-dependent covalent interaction is REQUIRED to reconstitute EDEM3 trimming of misfolded TCRalpha in vitro PMID:29784879. This is the EDEM3 analog of the EDEM2-TXNDC11 redox pair (George 2020) - both EDEMs are gated by a disulfide-linked ER oxidoreductase.
Manica et al. 2021 (IJMS): EDEM3 has four cooperating modules - GH47 (mannosidase, substrate binding), IMD (intermediate, needed for GH47 folding), PA (protease-associated), and IDD (intrinsically disordered). GH47 binds substrate even without trimming; PA and IDD do not affect trimming per se but modulate ERAD turnover timing of specific clients (NHK, soluble tyrosinase mutant). Few stable ER interactors -> transient substrate engagement PMID:33671632. Defines EDEM3's role in setting ERAD timing/client selectivity.
Ghionescu et al. 2025 (J Biomed Sci): EDEM3 is upregulated in HCC, highest in HBV-infected tumors, associated with progression/poor prognosis; EDEM3 overexpression attenuates UPR and activates secretory autophagy promoting HBV production, while depletion induces ER stress and apoptosis PMID:39838427. Pro-survival/pro-viral disease role.
Lagou et al. 2023 (Nat Genet, PMID resolvable but NOT added): cross-ancestry random-glucose GWAS in 476,326 individuals nominated the EDEM3 locus (low-frequency coding variant) for glucose homeostasis - a genetic association, not a molecular-function finding, so notes-only.
References ADDED to review: PMID:16431915 (Hirao 2006, HIGH), PMID:29784879 (Yu 2018, HIGH), PMID:33671632 (Manica 2021, HIGH), PMID:39838427 (Ghionescu 2025, MEDIUM). PMID:16431915 and PMID:29784879 added (id only, uncached) to core_function supported_by.

Pn Notes

(EDEM3-pn-notes.md)

EDEM3 PN Consistency Notes

Generated: 2026-06-18
Project: PROTEOSTASIS
Scope: PN consistency rereview against local AIGR review and available deep-research artifacts
UniProt: Q9BZQ6
AIGR review status: COMPLETE
Review batch: proteostasis-batch-2026-06-11
Batch change status: added

Source Files Checked

AIGR review YAML: present - genes/human/EDEM3/EDEM3-ai-review.yaml
AIGR review HTML: missing - genes/human/EDEM3/EDEM3-ai-review.html
Gene notes: present - genes/human/EDEM3/EDEM3-notes.md
GOA TSV: present - genes/human/EDEM3/EDEM3-goa.tsv
UniProt record: present - genes/human/EDEM3/EDEM3-uniprot.txt
PN dossier: projects/PROTEOSTASIS/reports/phase1_dossiers/EDEM3.md
PN consistency section: projects/PROTEOSTASIS/reports/phase1_dossiers/_sections/EDEM3.md
PN projection report: projects/PROTEOSTASIS/reports/pn_projection/pn_projected_gene_go_summary.tsv
PN mapping audit: projects/PROTEOSTASIS/reports/pn_mapping_audit/current_mapping_scrutiny.tsv

Deep Research Files

genes/human/EDEM3/EDEM3-deep-research-falcon.md

AIGR Review Snapshot

Description: EDEM3 (ER degradation-enhancing alpha-mannosidase-like protein 3) is a soluble endoplasmic reticulum lumenal protein of glycoside hydrolase family 47 (GH47, EC 3.2.1.113), one of three mammalian Htm1/Mns1 homologues (EDEM1, EDEM2, EDEM3) acting in ER-associated degradation of glycoproteins (gpERAD). EDEM3 is an active, calcium-dependent alpha-1,2-mannosidase that accelerates glycoprotein ERAD by catalyzing the downstream mannose-trimming step from Man8GlcNAc2 to Man7GlcNAc2 and further trimming toward Man5GlcNAc2 isomers, generating the demannosylated glycans recognized by the downstream lectin OS-9. It acts mainly at the second trimming step (with EDEM1 contributing to a lesser extent), downstream of the first-step enzyme EDEM2, and, like EDEM1 but unlike EDEM2, it associates with the HRD1 adaptor SEL1L. Beyond misfolded ERAD substrates, EDEM3 may also trim N-glycans on general glycoproteins. It is unique among the EDEMs in containing a protease-associated (PA) domain of unknown function, is induced by the unfolded protein response, and is broadly expressed. Biallelic loss-of-function variants cause an autosomal-recessive congenital disorder of glycosylation (EDEM3-CDG / CDG2V) with neurodevelopmental delay.
Existing/core annotation action counts: ACCEPT: 14; KEEP_AS_NON_CORE: 3; MARK_AS_OVER_ANNOTATED: 2

PN Consistency Summary

Consistency: Deep research ↔ review YAML ↔ PN annotation consistent. EDEM3 = soluble ER-lumenal, calcium-dependent GH47 alpha-1,2-mannosidase (EC 3.2.1.113) catalyzing the downstream step Man8→Man7 (and toward Man5), with a unique PA domain; binds SEL1L (like EDEM1, unlike EDEM2); biallelic LoF causes EDEM3-CDG/CDG2V. Unlike EDEM1/EDEM2, EDEM3 has no negated mannosidase annotation — catalytic activity is undisputed (IBA/IEA/ISS/IMP + EC/RHEA all positive). No contradictions; this matches the prompt's note that EDEM3 is the demonstrably catalytic EDEM.
PN story / NEW pressure: subtype→GO:1904382 is already_in_goa_exact (TAS Reactome + review). EDEM3's role is fully captured (GO:0004571 across IBA/IEA/ISS/IMP/TAS; GO:1904380; GO:1904382; GO:0036503; GO:0097466). No NEW term needed; review proposes none. Already captured.
Evidence alignment: Strong overlap on PMID:25092655 (shared) and Reactome:R-HSA-6782685. Review adds rich EDEM3-specific literature (original characterization PMID:16431915 with E147Q catalytic proof; ERp46/TXNDC5 redox partner PMID:29784879; domain dissection PMID:33671632; HCC/HBV PMID:39838427) well beyond the terse PN row.
Verdict: Consistent and well-curated; the unambiguously catalytic EDEM. subtype→GO:1904382 sound and already captured; group→GO:0006487 is a loose/broad fit for the degradation arm.

Full Consistency Review

UniProt: Q9BZQ6 · batch: proteostasis-batch-2026-06-11 · review status: COMPLETE
PN placement: ER proteostasis|Glycoproteostasis|N-glycosylation system|N-glycan processing|Mannose trimming ; PN-node mapping: subtype "Mannose trimming"=mapped/ok GO:1904382 (already_in_goa_exact); group "N-glycosylation system"=mapped/ok GO:0006487 protein N-linked glycosylation (new_to_goa); intermediate type/class/branch=no_mapping.
Consistency: Deep research ↔ review YAML ↔ PN annotation consistent. EDEM3 = soluble ER-lumenal, calcium-dependent GH47 alpha-1,2-mannosidase (EC 3.2.1.113) catalyzing the downstream step Man8→Man7 (and toward Man5), with a unique PA domain; binds SEL1L (like EDEM1, unlike EDEM2); biallelic LoF causes EDEM3-CDG/CDG2V. Unlike EDEM1/EDEM2, EDEM3 has no negated mannosidase annotation — catalytic activity is undisputed (IBA/IEA/ISS/IMP + EC/RHEA all positive). No contradictions; this matches the prompt's note that EDEM3 is the demonstrably catalytic EDEM.
PN story / NEW pressure: subtype→GO:1904382 is already_in_goa_exact (TAS Reactome + review). EDEM3's role is fully captured (GO:0004571 across IBA/IEA/ISS/IMP/TAS; GO:1904380; GO:1904382; GO:0036503; GO:0097466). No NEW term needed; review proposes none. Already captured.
Mapping strategy: subtype→GO:1904382 exact and strongly supported — keep; EDEM3 is the prototypical "Mannose trimming" catalytic member. group→GO:0006487 protein N-linked glycosylation (new_to_goa) is broader/upstream (glycan biosynthesis) than EDEM3's degradative trimming and is a loose fit — borderline over-reach for a degradation-arm enzyme. The MF (GO:0004571) is correctly the clearest/strongest of the three EDEMs.
Evidence alignment: Strong overlap on PMID:25092655 (shared) and Reactome:R-HSA-6782685. Review adds rich EDEM3-specific literature (original characterization PMID:16431915 with E147Q catalytic proof; ERp46/TXNDC5 redox partner PMID:29784879; domain dissection PMID:33671632; HCC/HBV PMID:39838427) well beyond the terse PN row.
Verdict: Consistent and well-curated; the unambiguously catalytic EDEM. subtype→GO:1904382 sound and already captured; group→GO:0006487 is a loose/broad fit for the degradation arm.

PN Dossier Context

review_batch: proteostasis-batch-2026-06-11
review_yaml: genes/human/EDEM3/EDEM3-ai-review.yaml
PN workbook rows: 1

PN row 1: ER proteostasis | Glycoproteostasis | N-glycosylation system | N-glycan processing | Mannose trimming

UniProt: Q9BZQ6
In branches: ER
PN-node mapping records (path + ancestors):
- [subtype] ER proteostasis|Glycoproteostasis|N-glycosylation system|N-glycan processing|Mannose trimming
  status=mapped scope=ok_for_propagation_to_go GO=[GO:1904382 mannose trimming involved in glycoprotein ERAD pathway]
  rationale: Within the ER proteostasis branch, this PN subtype denotes mannose trimming used in glycoprotein quality control and ERAD triage. That is close enough for propagation to the GO mannose-trimming-in-ERAD process, but the PN subtype is framed as a proteostasis step rather than a formal GO process class.
- [type] ER proteostasis|Glycoproteostasis|N-glycosylation system|N-glycan processing
  status=no_mapping scope= GO=[]
  rationale: Reviewed as a broad PN category rather than a single GO class. The member genes span multiple activities, complexes, or contexts, so direct propagation from this node would overstate the shared biology.
- [group] ER proteostasis|Glycoproteostasis|N-glycosylation system
  status=mapped scope=ok_for_propagation_to_go GO=[GO:0006487 protein N-linked glycosylation]
  rationale: This PN group captures the ER N-glycosylation machinery that installs and processes N-linked glycans during proteostasis. GO protein N-linked glycosylation is the best current propagation target in the local cache.
- [class] ER proteostasis|Glycoproteostasis
  status=no_mapping scope= GO=[]
  rationale: Reviewed as a broad PN category rather than a single GO class. The member genes span multiple activities, complexes, or contexts, so direct propagation from this node would overstate the shared biology.
- [branch] ER proteostasis
  status=no_mapping scope= GO=[]
  rationale: Reviewed as a top-level PN branch. This is a systems/taxonomy umbrella, not a direct GO assertion; narrower child curations carry any propagating GO mappings.

Projected GO annotations (2)

GO:0006487 protein N-linked glycosylation | scope=ok_for_propagation_to_go | goa_status=new_to_goa | from=ER proteostasis|Glycoproteostasis|N-glycosylation system
GO:1904382 mannose trimming involved in glycoprotein ERAD pathway | scope=ok_for_propagation_to_go | goa_status=already_in_goa_exact | from=ER proteostasis|Glycoproteostasis|N-glycosylation system|N-glycan processing|Mannose trimming

Note

This file is generated from the current PROTEOSTASIS phase-1 dossier and local gene-review artifacts. Edit the source review, PN mapping, or dossier rather than this generated note when correcting the underlying curation.

📄 View Raw YAML

id: Q9BZQ6
gene_symbol: EDEM3
product_type: PROTEIN
status: COMPLETE
taxon:
  id: NCBITaxon:9606
  label: Homo sapiens
description: EDEM3 (ER degradation-enhancing alpha-mannosidase-like protein 3) is a soluble endoplasmic reticulum lumenal protein of glycoside hydrolase family 47 (GH47, EC 3.2.1.113), one of three mammalian Htm1/Mns1 homologues (EDEM1, EDEM2, EDEM3) acting in ER-associated degradation of glycoproteins (gpERAD). EDEM3 is an active, calcium-dependent alpha-1,2-mannosidase that accelerates glycoprotein ERAD by catalyzing the downstream mannose-trimming step from Man8GlcNAc2 to Man7GlcNAc2 and further trimming toward Man5GlcNAc2 isomers, generating the demannosylated glycans recognized by the downstream lectin OS-9. It acts mainly at the second trimming step (with EDEM1 contributing to a lesser extent), downstream of the first-step enzyme EDEM2, and, like EDEM1 but unlike EDEM2, it associates with the HRD1 adaptor SEL1L. Beyond misfolded ERAD substrates, EDEM3 may also trim N-glycans on general glycoproteins. It is unique among the EDEMs in containing a protease-associated (PA) domain of unknown function, is induced by the unfolded protein response, and is broadly expressed. Biallelic loss-of-function variants cause an autosomal-recessive congenital disorder of glycosylation (EDEM3-CDG / CDG2V) with neurodevelopmental delay.
alternative_products:
- name: '1'
  id: Q9BZQ6-1
- name: '2'
  id: Q9BZQ6-2
  sequence_note: VSP_056375, VSP_056376
existing_annotations:
- term:
    id: GO:0004571
    label: mannosyl-oligosaccharide 1,2-alpha-mannosidase activity
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  qualifier: enables
  review:
    summary: The defining molecular function of EDEM3; phylogenetic assignment of GH47 alpha-1,2-mannosidase activity is well supported across the EDEM/Htm1 family.
    action: ACCEPT
    reason: Core molecular function; corroborated by EC 3.2.1.113, RHEA catalytic reactions, and the IMP endogenous-knockout evidence.
    supported_by:
    - reference_id: file:human/EDEM3/EDEM3-uniprot.txt
      supporting_text: catalyzing mannose trimming from Man8GlcNAc2 to Man7GlcNAc2 in the N-glycans
- term:
    id: GO:0030968
    label: endoplasmic reticulum unfolded protein response
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  qualifier: involved_in
  review:
    summary: EDEM3 is a UPR-induced effector that functions in the ERAD arm of the ER stress response; phylogenetic assignment of involvement in the UPR is consistent with this.
    action: KEEP_AS_NON_CORE
    reason: EDEM3 is a UPR-induced ERAD effector rather than a UPR signaling/sensing component; the informative function is the ERAD/mannose-trimming role.
    supported_by:
    - reference_id: file:human/EDEM3/EDEM3-uniprot.txt
      supporting_text: Involved in endoplasmic reticulum-associated degradation (ERAD)
- term:
    id: GO:0097466
    label: ubiquitin-dependent glycoprotein ERAD pathway
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  qualifier: involved_in
  review:
    summary: EDEM3 functions in N-glycan-dependent (glycoprotein) ERAD, trimming glycans to commit misfolded glycoproteins for proteasomal degradation; an accurate, specific process for EDEM3.
    action: ACCEPT
    reason: Correct, specific core biological process; redundant with the experimental ERAD/mannose-trimming evidence.
    supported_by:
    - reference_id: file:human/EDEM3/EDEM3-uniprot.txt
      supporting_text: Accelerates the glycoprotein ERAD by proteasomes
- term:
    id: GO:0004571
    label: mannosyl-oligosaccharide 1,2-alpha-mannosidase activity
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  qualifier: enables
  review:
    summary: Electronic assignment of the core GH47 alpha-1,2-mannosidase activity (with EC 3.2.1.113 and RHEA reactions), consistent with experimental evidence.
    action: ACCEPT
    reason: Correct core molecular function; redundant with IMP/ISS evidence.
    supported_by:
    - reference_id: file:human/EDEM3/EDEM3-uniprot.txt
      supporting_text: EC=3.2.1.113
- term:
    id: GO:0005509
    label: calcium ion binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000002
  qualifier: enables
  review:
    summary: GH47 mannosidases require a Ca2+ ion for catalysis; EDEM3 binds calcium as a structural/catalytic cofactor of its mannosidase activity.
    action: KEEP_AS_NON_CORE
    reason: Accurate cofactor requirement of the GH47 fold but not a standalone core function; the catalytic mannosidase activity is the informative function.
    supported_by:
    - reference_id: file:human/EDEM3/EDEM3-uniprot.txt
      supporting_text: Name=Ca(2+)
- term:
    id: GO:0005783
    label: endoplasmic reticulum
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  qualifier: located_in
  review:
    summary: EDEM3 is an ER-resident lumenal protein; electronic (ARBA) assignment of ER localization is correct.
    action: ACCEPT
    reason: Correct site of action; redundant with the ER lumen annotation and UniProt subcellular location.
    supported_by:
    - reference_id: file:human/EDEM3/EDEM3-uniprot.txt
      supporting_text: 'SUBCELLULAR LOCATION: Endoplasmic reticulum lumen'
- term:
    id: GO:0005788
    label: endoplasmic reticulum lumen
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  qualifier: located_in
  review:
    summary: EDEM3 is a soluble ER lumenal protein (signal peptide, ER retention); electronic transfer of ER lumen localization is correct.
    action: ACCEPT
    reason: Correct compartment; consistent with UniProt subcellular location.
    supported_by:
    - reference_id: file:human/EDEM3/EDEM3-uniprot.txt
      supporting_text: 'SUBCELLULAR LOCATION: Endoplasmic reticulum lumen'
- term:
    id: GO:0005975
    label: carbohydrate metabolic process
  evidence_type: IEA
  original_reference_id: GO_REF:0000002
  qualifier: involved_in
  review:
    summary: Generic carbohydrate metabolic process from InterPro; far less informative than the specific ER mannose trimming and glycoprotein ERAD processes EDEM3 participates in.
    action: MARK_AS_OVER_ANNOTATED
    reason: Over-general parent; the specific ER mannose trimming (GO:1904380) and glycoprotein ERAD terms better capture the biology.
    supported_by:
    - reference_id: file:human/EDEM3/EDEM3-uniprot.txt
      supporting_text: catalyzing mannose trimming from Man8GlcNAc2 to Man7GlcNAc2 in the N-glycans
- term:
    id: GO:0006516
    label: glycoprotein catabolic process
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  qualifier: involved_in
  review:
    summary: EDEM3 contributes to catabolism of glycoproteins via gpERAD; this parent process is correct but less informative than the specific glycoprotein ERAD term.
    action: KEEP_AS_NON_CORE
    reason: Correct but generic; the specific ubiquitin-dependent glycoprotein ERAD pathway (GO:0097466) better captures EDEM3's role.
    supported_by:
    - reference_id: file:human/EDEM3/EDEM3-uniprot.txt
      supporting_text: Accelerates the glycoprotein ERAD by proteasomes
- term:
    id: GO:0016020
    label: membrane
  evidence_type: IEA
  original_reference_id: GO_REF:0000002
  qualifier: located_in
  review:
    summary: Generic membrane localization from InterPro. EDEM3 is in fact a soluble ER lumenal protein, so this term is both uninformative and a poor fit.
    action: MARK_AS_OVER_ANNOTATED
    reason: Uninformative and inaccurate parent from a domain-based inference; EDEM3 is a soluble ER lumenal protein, better captured by ER lumen.
    proposed_replacement_terms:
    - id: GO:0005788
      label: endoplasmic reticulum lumen
    supported_by:
    - reference_id: file:human/EDEM3/EDEM3-uniprot.txt
      supporting_text: 'SUBCELLULAR LOCATION: Endoplasmic reticulum lumen'
- term:
    id: GO:1904380
    label: endoplasmic reticulum mannose trimming
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  qualifier: involved_in
  review:
    summary: EDEM3 performs ER mannose trimming (Man8 to Man7 and beyond); electronic assignment is consistent with the IMP evidence.
    action: ACCEPT
    reason: Correct core biological process; redundant with the IMP annotation from endogenous knockout analysis.
    supported_by:
    - reference_id: PMID:25092655
      supporting_text: Mannose trimming from Man8GlcNAc2 to Man7GlcNAc2 is performed mainly by EDEM3 and to a lesser extent by EDEM1
- term:
    id: GO:0036503
    label: ERAD pathway
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  qualifier: involved_in
  review:
    summary: Electronic assignment of the ERAD pathway, consistent with experimental evidence that EDEM3 accelerates gpERAD.
    action: ACCEPT
    reason: Correct core biological process; redundant with IMP evidence.
    supported_by:
    - reference_id: file:human/EDEM3/EDEM3-uniprot.txt
      supporting_text: Involved in endoplasmic reticulum-associated degradation (ERAD)
- term:
    id: GO:0004571
    label: mannosyl-oligosaccharide 1,2-alpha-mannosidase activity
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-6782685
  qualifier: enables
  review:
    summary: Reactome curation of EDEM3 (with EDEM1) hydrolysing Man8b to Man5 glycans, an accurate representation of EDEM3's downstream trimming activity.
    action: ACCEPT
    reason: Correct core molecular function; consistent with the catalytic activity and IMP evidence.
    supported_by:
    - reference_id: file:human/EDEM3/EDEM3-uniprot.txt
      supporting_text: catalyzing mannose trimming from Man8GlcNAc2 to Man7GlcNAc2 in the N-glycans
- term:
    id: GO:0036503
    label: ERAD pathway
  evidence_type: IMP
  original_reference_id: PMID:25092655
  qualifier: involved_in
  review:
    summary: Endogenous EDEM3 knockout increased Man8B levels and impaired the second trimming step, consistent with delayed gpERAD; EDEM3 accelerates glycoprotein ERAD.
    action: ACCEPT
    reason: Core biological process with direct experimental (IMP) support from endogenous gene knockout.
    supported_by:
    - reference_id: PMID:25092655
      supporting_text: M8B is trimmed by EDEM1 and EDEM3 to Man7-5GlcNAc2, which are recognized by lectin OS-9
- term:
    id: GO:1904380
    label: endoplasmic reticulum mannose trimming
  evidence_type: IMP
  original_reference_id: PMID:25092655
  qualifier: involved_in
  review:
    summary: Endogenous EDEM3 knockout in human and chicken cells increased Man8B levels, demonstrating EDEM3 performs the second ER mannose-trimming step from Man8GlcNAc2 to Man7GlcNAc2.
    action: ACCEPT
    reason: Core biological process with direct experimental (IMP) support.
    supported_by:
    - reference_id: PMID:25092655
      supporting_text: Mannose trimming from Man8GlcNAc2 to Man7GlcNAc2 is performed mainly by EDEM3 and to a lesser extent by EDEM1
- term:
    id: GO:0004571
    label: mannosyl-oligosaccharide 1,2-alpha-mannosidase activity
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: enables
  review:
    summary: Sequence-similarity transfer (from yeast Mns1, UniProtKB:P32906) of the alpha-1,2-mannosidase activity; consistent with the experimental and EC/RHEA evidence.
    action: ACCEPT
    reason: Correct core molecular function; consistent with IMP/IEA evidence.
    supported_by:
    - reference_id: file:human/EDEM3/EDEM3-uniprot.txt
      supporting_text: EC=3.2.1.113
- term:
    id: GO:1904382
    label: mannose trimming involved in glycoprotein ERAD pathway
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-6782685
  qualifier: involved_in
  review:
    summary: Reactome curation of EDEM3 mannose trimming within the glycoprotein ERAD pathway; an accurate, specific refinement of EDEM3's trimming contribution to ERAD.
    action: ACCEPT
    reason: Correct specific biological process linking the trimming activity to ERAD.
    supported_by:
    - reference_id: PMID:25092655
      supporting_text: M8B is trimmed by EDEM1 and EDEM3 to Man7-5GlcNAc2, which are recognized by lectin OS-9
- term:
    id: GO:0004571
    label: mannosyl-oligosaccharide 1,2-alpha-mannosidase activity
  evidence_type: IMP
  original_reference_id: PMID:25092655
  qualifier: enables
  review:
    summary: Endogenous gene knockout demonstrated that EDEM3 possesses alpha-1,2-mannosidase activity, performing the second trimming step Man8B to Man7; EDEM3 has the clearest catalytic activity of the three EDEMs.
    action: ACCEPT
    reason: Core molecular function with direct experimental (IMP) support.
    supported_by:
    - reference_id: PMID:25092655
      supporting_text: Mannose trimming from Man8GlcNAc2 to Man7GlcNAc2 is performed mainly by EDEM3 and to a lesser extent by EDEM1
- term:
    id: GO:0044322
    label: endoplasmic reticulum quality control compartment
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-6782685
  qualifier: located_in
  review:
    summary: Reactome curation of EDEM3 localization to the ER-derived quality control compartment (ERQC), where mannose trimming of ERAD substrates occurs.
    action: ACCEPT
    reason: Correct compartment; consistent with EDEM3's ER residence and role in ERAD substrate trimming.
    supported_by:
    - reference_id: file:human/EDEM3/EDEM3-uniprot.txt
      supporting_text: 'SUBCELLULAR LOCATION: Endoplasmic reticulum lumen'
references:
- id: GO_REF:0000002
  title: Gene Ontology annotation through association of InterPro records with GO terms
  findings: []
- id: GO_REF:0000024
  title: Manual transfer of experimentally-verified manual GO annotation data to orthologs by curator judgment of sequence similarity
  findings: []
- id: GO_REF:0000033
  title: Annotation inferences using phylogenetic trees
  findings: []
- id: GO_REF:0000117
  title: Electronic Gene Ontology annotations created by ARBA machine learning models
  findings: []
- id: GO_REF:0000120
  title: Combined Automated Annotation using Multiple IEA Methods
  findings: []
- id: PMID:25092655
  title: EDEM2 initiates mammalian glycoprotein ERAD by catalyzing the first mannose trimming step.
  findings:
  - statement: Endogenous EDEM3 (mainly) and EDEM1 (to a lesser extent) catalyze the second trimming step Man8B to Man7, and EDEM1/EDEM3 trim M8B to Man7-5GlcNAc2 recognized by OS-9; SEL1L binds EDEM1 and EDEM3 but not EDEM2.
    reference_section_type: RESULTS
  reference_review:
    relevance: HIGH
    correctness: VERIFIED
    review_notes: Definitive endogenous-knockout study; establishes EDEM3 as the main second-step mannosidase of mammalian gpERAD and its SEL1L association.
- id: PMID:16431915
  title: EDEM3, a soluble EDEM homolog, enhances glycoprotein endoplasmic reticulum-associated degradation and mannose trimming.
  findings:
  - statement: EDEM3 is a 931-aa soluble Class I GH47 alpha-mannosidase homolog with a C-terminal protease-associated motif; overexpression accelerates gpERAD of misfolded alpha-1-antitrypsin NHK and TCRalpha and stimulates mannose trimming from misfolded and total glycoproteins, while the catalytic-site E147Q mutant abolishes trimming and greatly decreases ERAD enhancement, showing EDEM3 has alpha-1,2-mannosidase activity in vivo.
    reference_section_type: ABSTRACT
  reference_review:
    relevance: HIGH
    correctness: VERIFIED
    review_notes: PubMed-verified (PMID:16431915, doi:10.1074/jbc.M512191200). Original EDEM3 characterization establishing its in vivo alpha-1,2-mannosidase activity, the E147Q catalytic requirement, the PA motif, and ERAD acceleration. Not cached; reference added without verbatim supporting_text.
- id: PMID:29784879
  title: ER-resident protein 46 (ERp46) triggers the mannose-trimming activity of ER degradation-enhancing alpha-mannosidase-like protein 3 (EDEM3).
  findings:
  - statement: EDEM3 stably associates with the ER oxidoreductase ERp46 (TXNDC5) via a disulfide bond between ERp46 redox-active cysteines and the EDEM3 alpha-mannosidase domain; this redox-dependent covalent interaction is required to reconstitute EDEM3 mannose-trimming activity toward the misfolded substrate TCRalpha in vitro, coupling demannosylation to ER redox state.
    reference_section_type: ABSTRACT
  reference_review:
    relevance: HIGH
    correctness: VERIFIED
    review_notes: PubMed-verified (PMID:29784879, doi:10.1074/jbc.RA118.003129). Establishes ERp46/TXNDC5 as the disulfide-linked oxidoreductase partner gating EDEM3 activity, paralleling the EDEM2-TXNDC11 redox pair. Not cached; reference added without verbatim supporting_text.
- id: PMID:33671632
  title: EDEM3 Domains Cooperate to Perform Its Overall Cell Functioning.
  findings:
  - statement: EDEM3 comprises four modules - GH47 mannosidase-like, intermediate (IMD), protease-associated (PA), and intrinsically disordered (IDD) domains; the GH47 domain provides substrate binding even without mannose trimming and requires the IMD for folding, while PA and IDD domains do not affect trimming per se but modulate the ERAD turnover timing of specific misfolded clients (NHK, soluble tyrosinase mutant). EDEM3 has few stable ER interactors, consistent with transient substrate engagement.
    reference_section_type: ABSTRACT
  reference_review:
    relevance: HIGH
    correctness: VERIFIED
    review_notes: PubMed-verified (PMID:33671632, doi:10.3390/ijms22042172). Domain-dissection study defining the GH47/IMD/PA/IDD architecture and the PA/IDD roles in tuning ERAD timing and client selectivity. Not cached; reference added without verbatim supporting_text.
- id: PMID:39838427
  title: The endoplasmic reticulum degradation-enhancing alpha-mannosidase-like protein 3 attenuates the unfolded protein response and has pro-survival and pro-viral roles in hepatoma cells and hepatocellular carcinoma patients.
  findings:
  - statement: EDEM3 is significantly upregulated in hepatocellular carcinoma tissues, with the highest levels in HBV-infected patients, and its expression associates with tumor progression and poor prognosis; EDEM3 overexpression attenuates the UPR and activates secretory autophagy to promote HBV production, whereas EDEM3 depletion induces ER stress and pro-apoptotic cell death.
    reference_section_type: ABSTRACT
  reference_review:
    relevance: MEDIUM
    correctness: VERIFIED
    review_notes: PubMed-verified (PMID:39838427, doi:10.1186/s12929-024-01103-9). Disease-context study showing pro-survival/pro-viral roles of EDEM3 in HCC/HBV via UPR attenuation and secretory autophagy. Not cached; reference added without verbatim supporting_text.
- id: Reactome:R-HSA-6782685
  title: EDEM1,3 hydrolyse (GlcNAc)2 (Man)8b to (GlcNAc)2 (Man)5
  findings: []
- id: file:human/EDEM3/EDEM3-uniprot.txt
  title: UniProt entry Q9BZQ6 (EDEM3_HUMAN), ER degradation-enhancing alpha-mannosidase-like protein 3
  findings:
  - statement: Calcium-dependent ER lumenal GH47 alpha-1,2-mannosidase (EC 3.2.1.113) that accelerates glycoprotein ERAD by trimming Man8GlcNAc2 to Man7GlcNAc2 and further to Man5 isomers; contains a protease-associated (PA) domain; biallelic variants cause CDG2V/EDEM3-CDG.
    reference_section_type: OTHER
core_functions:
- description: Calcium-dependent alpha-1,2-mannosidase that catalyzes the downstream ER mannose-trimming step from Man8GlcNAc2 to Man7GlcNAc2 (and further toward Man5GlcNAc2 isomers), accelerating glycoprotein ERAD by generating the demannosylated glycan recognized by the downstream lectin OS-9.
  molecular_function:
    id: GO:0004571
    label: mannosyl-oligosaccharide 1,2-alpha-mannosidase activity
  locations:
  - id: GO:0005788
    label: endoplasmic reticulum lumen
  supported_by:
  - reference_id: PMID:25092655
    supporting_text: Mannose trimming from Man8GlcNAc2 to Man7GlcNAc2 is performed mainly by EDEM3 and to a lesser extent by EDEM1
  - reference_id: file:human/EDEM3/EDEM3-uniprot.txt
    supporting_text: catalyzing mannose trimming from Man8GlcNAc2 to Man7GlcNAc2 in the N-glycans
  - reference_id: PMID:16431915
  - reference_id: PMID:29784879
  directly_involved_in:
  - id: GO:1904380
    label: endoplasmic reticulum mannose trimming
  - id: GO:0036503
    label: ERAD pathway
- description: Accelerates ubiquitin-dependent ER-associated degradation of misfolded glycoproteins by trimming their N-glycans within the gpERAD pathway, acting downstream of EDEM2 and in association with the HRD1 adaptor SEL1L.
  molecular_function:
    id: GO:0004571
    label: mannosyl-oligosaccharide 1,2-alpha-mannosidase activity
  locations:
  - id: GO:0005788
    label: endoplasmic reticulum lumen
  supported_by:
  - reference_id: file:human/EDEM3/EDEM3-uniprot.txt
    supporting_text: Accelerates the glycoprotein ERAD by proteasomes
  - reference_id: PMID:16431915
  directly_involved_in:
  - id: GO:0097466
    label: ubiquitin-dependent glycoprotein ERAD pathway
proposed_new_terms: []
suggested_questions:
- question: What is the function of the EDEM3-specific protease-associated (PA) domain in substrate recognition or regulation of its mannosidase activity?
- question: To what extent does EDEM3 trim N-glycans on correctly folded/general glycoproteins versus only misfolded ERAD substrates, and how does this relate to the EDEM3-CDG glycosylation phenotype?
suggested_experiments:
- description: Reconstitute purified EDEM3 (wild-type, catalytic-dead, and PA-domain-deleted) on defined Man8GlcNAc2 glycoprotein substrates to quantify the second-step trimming activity and the PA domain's contribution to substrate selection.
- description: Glycomic and substrate-degradation profiling of EDEM3-CDG patient-variant knock-in cells to determine how loss of EDEM3 mannosidase activity alters N-glycan trimming on general versus misfolded glycoproteins.

EDEM3

Gene Description

Existing Annotations Review

Core Functions

Calcium-dependent alpha-1,2-mannosidase that catalyzes the downstream ER mannose-trimming step from Man8GlcNAc2 to Man7GlcNAc2 (and further toward Man5GlcNAc2 isomers), accelerating glycoprotein ERAD by generating the demannosylated glycan recognized by the downstream lectin OS-9.

Accelerates ubiquitin-dependent ER-associated degradation of misfolded glycoproteins by trimming their N-glycans within the gpERAD pathway, acting downstream of EDEM2 and in association with the HRD1 adaptor SEL1L.

References

Suggested Questions for Experts

Suggested Experiments

Deep Research

Falcon

Research report: Functional annotation of human EDEM3 (UniProt Q9BZQ6, gene EDEM3/C1orf22)

0. Target verification (critical identity check)

1. Key concepts and definitions (current understanding)

1.1 ER quality control (ERQC), ERAD, and gpERAD

1.2 EDEM proteins

2. EDEM3: protein features, domains, localization, and topology

2.1 Domain architecture

2.2 ER localization and retention

3. Primary molecular function: enzymatic reaction and substrate specificity

3.1 Enzymatic class

3.2 Substrate context

3.3 Glycan processing detail (branch/isomer specificity)

3.4 Practical limitation (what is not yet well quantified)

4. Mechanism in ERAD: interaction partners and redox regulation

4.1 ERp46/TXNDC5 as a key EDEM3 activator

4.2 Broader interactome: transient substrate engagement

5. Biological processes and pathway placement

5.1 Placement within sequential mannose trimming logic

5.2 Domain-level functional analysis (substrate handling and ERAD timing)

6. Recent developments (prioritizing 2023–2024)

6.1 Updated authoritative synthesis of ERAD mechanisms (2023)

6.2 Human genetics connects EDEM3 to glucose homeostasis (2023)

6.3 ER folding–degradation “tug-of-war” models incorporating EDEM activity (2024)

7. Current applications and real-world implementations

7.1 Research and biotechnology applications

7.2 Translational relevance: ERAD modulation in cancer

8. Disease associations and statistics (from recent/authoritative sources)

8.1 Database-curated human disease links (Open Targets)

8.2 HBV/HCC context (recent primary evidence; 2025, outside 2023–2024 but highly relevant)

9. Expert synthesis and interpretation (authoritative analysis)

Summary table (evidence map)

Key figure evidence (domain architecture)

References (URLs and publication dates highlighted where available)

Artifacts

Citations

📚 Additional Documentation

Notes

EDEM3 (Q9BZQ6) review notes

Identity

Function (synthesis)

Localization

Annotation review decisions

Falcon deep-research findings (incorporated 2026-06)

Pn Notes

EDEM3 PN Consistency Notes

Source Files Checked

Deep Research Files

AIGR Review Snapshot

PN Consistency Summary

Full Consistency Review

PN Dossier Context

PN row 1: ER proteostasis | Glycoproteostasis | N-glycosylation system | N-glycan processing | Mannose trimming

Projected GO annotations (2)

Note

📄 View Raw YAML