id: Q8N766
gene_symbol: EMC1
product_type: PROTEIN
status: COMPLETE
taxon:
  id: NCBITaxon:9606
  label: Homo sapiens
description: EMC1 (ER membrane protein complex subunit 1) is the large lumenal scaffold subunit of the endoplasmic reticulum membrane protein complex (EMC), a conserved nine- to ten-subunit transmembrane-domain insertase and chaperone of the ER. The 993-residue protein has a cleaved N-terminal signal peptide, an extensive lumenal region (~residues 23-962) that folds into a GOLD-like/WD40-YVTN beta-propeller, a single C-terminal transmembrane helix, and a short cytoplasmic tail, making it a single-pass type I membrane protein. As part of the EMC it enables the energy-independent insertion of newly synthesized membrane proteins into the ER membrane, with a preference for transmembrane domains that are weakly hydrophobic or carry destabilizing charged or aromatic residues. The complex inserts tail-anchored proteins post-translationally and inserts the first transmembrane domains of multipass proteins such as G protein-coupled receptors co-translationally, setting their N-exo topology in cooperation with the Sec61 translocon. The catalytic insertion vestibule of the complex is formed by the EMC3 and EMC6 subunits; EMC1 itself is non-catalytic and serves as a lumenal structural scaffold and assembly platform. EMC1 is broadly expressed and resides in the ER membrane, and biallelic or monoallelic variants cause CAVIPMR (cerebellar atrophy, visual impairment, and psychomotor retardation), an autosomal recessive neurodegenerative disorder.
alternative_products:
- name: '1'
  id: Q8N766-1
- name: '2'
  id: Q8N766-2
  sequence_note: VSP_020328
- name: '3'
  id: Q8N766-3
  sequence_note: VSP_020329
- name: '4'
  id: Q8N766-4
  sequence_note: VSP_020327
existing_annotations:
- term:
    id: GO:0072546
    label: EMC complex
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  qualifier: part_of
  review:
    summary: EMC1 is a constitutive subunit of the ER membrane protein complex (EMC); the phylogenetic (IBA) assignment of EMC complex membership matches the experimentally demonstrated composition and is a core localization/complex annotation.
    action: ACCEPT
    reason: Core complex membership; EMC1 is the large lumenal scaffold subunit of the EMC, supported experimentally and conserved across the EMC1 family.
    supported_by:
    - reference_id: file:human/EMC1/EMC1-uniprot.txt
      supporting_text: Component of the ER membrane protein complex (EMC).
- term:
    id: GO:0005789
    label: endoplasmic reticulum membrane
  evidence_type: IEA
  original_reference_id: GO_REF:0000044
  qualifier: located_in
  review:
    summary: Electronic transfer of the UniProt subcellular location to ER membrane, consistent with direct experimental localization evidence.
    action: ACCEPT
    reason: Correct compartment; EMC1 is an ER membrane protein, redundant with IDA evidence.
    supported_by:
    - reference_id: file:human/EMC1/EMC1-uniprot.txt
      supporting_text: 'SUBCELLULAR LOCATION: Endoplasmic reticulum membrane'
- term:
    id: GO:0072546
    label: EMC complex
  evidence_type: IEA
  original_reference_id: GO_REF:0000002
  qualifier: part_of
  review:
    summary: InterPro-based electronic assignment of EMC complex membership, consistent with the experimental IDA/IBA annotations.
    action: ACCEPT
    reason: Correct; EMC1 is a defining EMC subunit, redundant with stronger evidence.
    supported_by:
    - reference_id: file:human/EMC1/EMC1-uniprot.txt
      supporting_text: Component of the ER membrane protein complex (EMC).
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:32353859
  qualifier: enables
  review:
    summary: High-throughput SARS-CoV-2 affinity-purification interactome capturing an interaction between EMC1 and the viral ORF8 protein (P0DTC8). The bare protein binding term is uninformative and the partner is a viral xenobiotic protein, not a core EMC functional interaction.
    action: KEEP_AS_NON_CORE
    reason: Records a real virus-host interactome capture (EMC1 with SARS-CoV-2 ORF8) but bare protein binding is uninformative and the partner does not reflect EMC1's core ER-insertase scaffolding role; not elevated to core.
    supported_by:
    - reference_id: file:human/EMC1/EMC1-uniprot.txt
      supporting_text: 'Q8N766; P0DTC8: 8; Xeno; NbExp=3; IntAct=EBI-1044442, EBI-25475900;'
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:33060197
  qualifier: enables
  review:
    summary: Comparative coronavirus host-interactome screen capturing the EMC1-SARS-CoV-2 ORF8 (P0DTC8) interaction. Bare protein binding is uninformative and the partner is a viral protein unrelated to EMC1's core function.
    action: KEEP_AS_NON_CORE
    reason: Real virus-host interactome capture but bare protein binding is uninformative; the viral partner does not inform EMC1's core ER membrane-insertase scaffolding role.
    supported_by:
    - reference_id: file:human/EMC1/EMC1-uniprot.txt
      supporting_text: 'Q8N766; P0DTC8: 8; Xeno; NbExp=3; IntAct=EBI-1044442, EBI-25475900;'
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:36217030
  qualifier: enables
  review:
    summary: Comprehensive SARS-CoV-2-human protein-protein interactome capturing the EMC1-ORF8 (P0DTC8) interaction. Bare protein binding is uninformative and the partner is a viral protein.
    action: KEEP_AS_NON_CORE
    reason: Real virus-host interactome capture; bare protein binding is uninformative and the viral partner is not part of EMC1's core insertase scaffolding function.
    supported_by:
    - reference_id: file:human/EMC1/EMC1-uniprot.txt
      supporting_text: 'Q8N766; P0DTC8: 8; Xeno; NbExp=3; IntAct=EBI-1044442, EBI-25475900;'
- term:
    id: GO:0005783
    label: endoplasmic reticulum
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  qualifier: located_in
  review:
    summary: Electronic assignment of the parent endoplasmic reticulum compartment, consistent with the more specific ER membrane localization that is experimentally supported.
    action: ACCEPT
    reason: Correct compartment; EMC1 is an ER membrane protein, so the parent ER term is accurate, though GO:0005789 (ER membrane) is more informative.
    supported_by:
    - reference_id: file:human/EMC1/EMC1-uniprot.txt
      supporting_text: 'SUBCELLULAR LOCATION: Endoplasmic reticulum membrane'
- term:
    id: GO:0005789
    label: endoplasmic reticulum membrane
  evidence_type: NAS
  original_reference_id: PMID:29242231
  qualifier: located_in
  review:
    summary: ComplexPortal NAS annotation of EMC1 ER membrane localization, consistent with the direct experimental (IDA) evidence and the UniProt subcellular location.
    action: ACCEPT
    reason: Correct compartment; EMC1 resides in the ER membrane as part of the EMC, redundant with IDA evidence.
    supported_by:
    - reference_id: file:human/EMC1/EMC1-uniprot.txt
      supporting_text: 'SUBCELLULAR LOCATION: Endoplasmic reticulum membrane'
- term:
    id: GO:0045050
    label: protein insertion into ER membrane by stop-transfer membrane-anchor sequence
  evidence_type: IDA
  original_reference_id: PMID:29242231
  qualifier: involved_in
  review:
    summary: As a subunit of the EMC, EMC1 participates in the insertion of transmembrane segments (including stop-transfer/membrane-anchor sequences) into the ER membrane. This is a complex-level contribution reflecting EMC1's membership in the insertase complex.
    action: ACCEPT
    reason: Correct complex-level process annotation (involved_in); the EMC is a demonstrated transmembrane-domain insertase and EMC1 is a constitutive subunit. EMC1 itself is the non-catalytic lumenal scaffold but the process is correctly attributed to the complex.
    supported_by:
    - reference_id: PMID:29242231
      supporting_text: EMC is a transmembrane domain insertase
    - reference_id: file:human/EMC1/EMC1-uniprot.txt
      supporting_text: stop-transfer membrane-anchor sequences become ER membrane spanning
- term:
    id: GO:0071816
    label: tail-anchored membrane protein insertion into ER membrane
  evidence_type: IDA
  original_reference_id: PMID:29242231
  qualifier: involved_in
  review:
    summary: As a constitutive EMC subunit, EMC1 participates in the post-translational insertion of tail-anchored proteins into the ER membrane, a directly demonstrated EMC activity. This is a core complex-level process annotation; EMC1 itself is the non-catalytic lumenal scaffold.
    action: ACCEPT
    reason: Core EMC-mediated process; the EMC is a demonstrated transmembrane-domain insertase that inserts tail-anchored proteins, and EMC1 is a defining subunit.
    supported_by:
    - reference_id: PMID:29242231
      supporting_text: EMC is a transmembrane domain insertase
    - reference_id: file:human/EMC1/EMC1-uniprot.txt
      supporting_text: post-translational insertion of tail-anchored/TA proteins in
- term:
    id: GO:0072546
    label: EMC complex
  evidence_type: IPI
  original_reference_id: PMID:32439656
  qualifier: part_of
  review:
    summary: ComplexPortal IPI assignment of EMC complex membership based on the cryo-EM structure of the human EMC. Core structural identity of EMC1 as the large lumenal scaffold subunit.
    action: ACCEPT
    reason: Structurally demonstrated core EMC membership.
    supported_by:
    - reference_id: file:human/EMC1/EMC1-uniprot.txt
      supporting_text: Component of the ER membrane protein complex (EMC).
- term:
    id: GO:0032977
    label: membrane insertase activity
  evidence_type: IMP
  original_reference_id: PMID:29809151
  qualifier: contributes_to
  review:
    summary: IMP evidence (cotranslational multipass biogenesis study) that the EMC has membrane insertase activity, to which EMC1 contributes as a subunit. The contributes_to qualifier is appropriate because the catalytic insertion vestibule is formed by EMC3 and EMC6, while EMC1 is the non-catalytic lumenal scaffold that supports complex function.
    action: ACCEPT
    reason: Correct complex-level MF with contributes_to qualifier; EMC1 supports the insertase activity of the whole complex though it is not itself catalytic.
    supported_by:
    - reference_id: PMID:32439656
      supporting_text: occurs via an enclosed hydrophilic
    - reference_id: file:human/EMC1/EMC1-uniprot.txt
      supporting_text: enables the energy-independent insertion into endoplasmic
- term:
    id: GO:0032977
    label: membrane insertase activity
  evidence_type: IMP
  original_reference_id: PMID:30415835
  qualifier: contributes_to
  review:
    summary: IMP evidence (topogenesis study) supporting the EMC's membrane insertase activity, to which EMC1 contributes as the lumenal scaffold subunit. The contributes_to qualifier correctly reflects that EMC1 is non-catalytic while the complex performs the insertion.
    action: ACCEPT
    reason: Correct complex-level MF with contributes_to qualifier; EMC1 supports the insertase activity of the EMC.
    supported_by:
    - reference_id: file:human/EMC1/EMC1-uniprot.txt
      supporting_text: enables the energy-independent insertion into endoplasmic
- term:
    id: GO:0045050
    label: protein insertion into ER membrane by stop-transfer membrane-anchor sequence
  evidence_type: IMP
  original_reference_id: PMID:29809151
  qualifier: involved_in
  review:
    summary: The EMC is required for cotranslational insertion of multipass membrane proteins in which stop-transfer membrane-anchor sequences become ER membrane-spanning helices; EMC1 is a constitutive subunit of this insertase. Core EMC process.
    action: ACCEPT
    reason: Core EMC-mediated process; supported by IMP of EMC subunits in the cotranslational multipass biogenesis study.
    supported_by:
    - reference_id: file:human/EMC1/EMC1-uniprot.txt
      supporting_text: stop-transfer membrane-anchor sequences become ER membrane spanning
- term:
    id: GO:0005789
    label: endoplasmic reticulum membrane
  evidence_type: IDA
  original_reference_id: PMID:22119785
  qualifier: located_in
  review:
    summary: Direct experimental ER membrane localization from the foundational ERAD-network mapping study that first identified the EMC. Core compartment for EMC1.
    action: ACCEPT
    reason: Experimentally supported core location.
    supported_by:
    - reference_id: file:human/EMC1/EMC1-uniprot.txt
      supporting_text: 'SUBCELLULAR LOCATION: Endoplasmic reticulum membrane'
- term:
    id: GO:0005789
    label: endoplasmic reticulum membrane
  evidence_type: IDA
  original_reference_id: PMID:32439656
  qualifier: located_in
  review:
    summary: Direct (cryo-EM structural) evidence placing EMC1 in the ER membrane as a single-pass type I membrane subunit of the EMC. Core compartment.
    action: ACCEPT
    reason: Experimentally supported core location.
    supported_by:
    - reference_id: file:human/EMC1/EMC1-uniprot.txt
      supporting_text: 'SUBCELLULAR LOCATION: Endoplasmic reticulum membrane'
- term:
    id: GO:0045050
    label: protein insertion into ER membrane by stop-transfer membrane-anchor sequence
  evidence_type: IMP
  original_reference_id: PMID:30415835
  qualifier: involved_in
  review:
    summary: IMP evidence (topogenesis study) that the EMC inserts stop-transfer membrane-anchor sequences and sets the N-exo topology of multipass clients such as GPCRs; EMC1 is part of the insertase. Core EMC process.
    action: ACCEPT
    reason: Core EMC-mediated process.
    supported_by:
    - reference_id: file:human/EMC1/EMC1-uniprot.txt
      supporting_text: stop-transfer membrane-anchor sequences become ER membrane spanning
- term:
    id: GO:0032991
    label: protein-containing complex
  evidence_type: IDA
  original_reference_id: PMID:28246125
  qualifier: part_of
  review:
    summary: MGI IDA assignment of generic protein-containing complex membership, derived from the ZMPSTE24/IFITM antiviral study in which EMC1 appears as a co-purifying complex component. This is a generic parent of the specific EMC complex term and is uninformative on its own.
    action: KEEP_AS_NON_CORE
    reason: Correct but generic (a parent of GO:0072546 EMC complex); the EMC complex term captures the informative complex membership. Per guidelines an experimental IDA is retained, not removed.
    supported_by:
    - reference_id: file:human/EMC1/EMC1-uniprot.txt
      supporting_text: Component of the ER membrane protein complex (EMC).
- term:
    id: GO:0016020
    label: membrane
  evidence_type: IDA
  original_reference_id: PMID:22119785
  qualifier: located_in
  review:
    summary: Direct generic membrane localization from the EMC-discovery study; a parent of the specific ER membrane term.
    action: KEEP_AS_NON_CORE
    reason: Correct but generic; the ER membrane term captures the informative localization.
    supported_by:
    - reference_id: file:human/EMC1/EMC1-uniprot.txt
      supporting_text: 'SUBCELLULAR LOCATION: Endoplasmic reticulum membrane'
- term:
    id: GO:0072546
    label: EMC complex
  evidence_type: IDA
  original_reference_id: PMID:22119785
  qualifier: part_of
  review:
    summary: Direct experimental identification of EMC1 in the EMC by the foundational ERAD-network mapping study. Core structural identity of EMC1 as the large lumenal scaffold subunit.
    action: ACCEPT
    reason: Core EMC membership; directly demonstrated.
    supported_by:
    - reference_id: file:human/EMC1/EMC1-uniprot.txt
      supporting_text: Component of the ER membrane protein complex (EMC).
core_functions:
- description: Constitutive large lumenal scaffold subunit of the ER membrane protein complex (EMC); EMC1 contributes to the complex's energy-independent membrane insertase activity that inserts transmembrane domains into the ER membrane, though the catalytic vestibule is formed by EMC3 and EMC6.
  molecular_function:
    id: GO:0032977
    label: membrane insertase activity
  in_complex:
    id: GO:0072546
    label: EMC complex
  locations:
  - id: GO:0005789
    label: endoplasmic reticulum membrane
  supported_by:
  - reference_id: file:human/EMC1/EMC1-uniprot.txt
    supporting_text: enables the energy-independent insertion into endoplasmic
  - reference_id: PMID:32439656
    supporting_text: occurs via an enclosed hydrophilic
- description: As part of the EMC, contributes to post-translational insertion of tail-anchored proteins and cotranslational insertion and N-exo topogenesis of multipass membrane proteins (including GPCRs) at the ER membrane.
  molecular_function:
    id: GO:0032977
    label: membrane insertase activity
  locations:
  - id: GO:0005789
    label: endoplasmic reticulum membrane
  supported_by:
  - reference_id: file:human/EMC1/EMC1-uniprot.txt
    supporting_text: post-translational insertion of tail-anchored/TA proteins in
  directly_involved_in:
  - id: GO:0071816
    label: tail-anchored membrane protein insertion into ER membrane
  - id: GO:0045050
    label: protein insertion into ER membrane by stop-transfer membrane-anchor sequence
- description: Within the EMC, EMC1 engages client transmembrane domains in a chaperone/holdase mode that is distinct from the EMC3/EMC6 insertase vestibule; EMC1 modulates client TMD orientation in the bilayer and stabilizes partially assembled membrane-protein complexes (e.g. CaV channel assembly intermediates).
  molecular_function:
    id: GO:0051082
    label: unfolded protein binding
  locations:
  - id: GO:0005789
    label: endoplasmic reticulum membrane
  supported_by:
  - reference_id: PMID:40753078
    supporting_text: the EMC engages TMDs via its EMC1 subunit and modulates their orientation within the lipid bilayer
  - reference_id: PMID:37196677
    supporting_text: EMC functions as a channel holdase that facilitates channel assembly
proposed_new_terms: []
suggested_questions:
- question: How do CAVIPMR-causing variants in the EMC1 lumenal beta-propeller (e.g. T82M, G868R) impair EMC assembly or client insertion, and why is the nervous system particularly vulnerable?
- question: Does the EMC1 lumenal scaffold confer client selectivity, or does it act purely structurally to position the EMC3/EMC6 catalytic core?
suggested_experiments:
- description: Reconstitute the human EMC lacking EMC1 (or carrying CAVIPMR variants) in proteoliposomes and measure insertion of tail-anchored and multipass substrates to define EMC1's structural contribution to insertase activity.
- description: Perform quantitative membrane proteomics in EMC1-knockout versus rescued neuronal cells to identify the EMC1-dependent client repertoire underlying CAVIPMR neurodegeneration.
references:
- id: PMID:32459176
  title: The architecture of EMC reveals a path for membrane protein insertion.
  reference_review:
    relevance: HIGH
    correctness: VERIFIED
    review_notes: 'O''Donnell et al. 2020 (eLife). Cryo-EM architecture of the human EMC,
      establishing the overall complex organization and subunit topology relevant to
      EMC1 as a constitutive EMC subunit.'
- id: GO_REF:0000002
  title: Gene Ontology annotation through association of InterPro records with GO
    terms
  findings: []
- id: GO_REF:0000033
  title: Annotation inferences using phylogenetic trees
  findings: []
- id: GO_REF:0000044
  title: Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular Location
    vocabulary mapping, accompanied by conservative changes to GO terms applied by
    UniProt
  findings: []
- id: GO_REF:0000120
  title: Combined Automated Annotation using Multiple IEA Methods
  findings: []
- id: PMID:22119785
  title: Defining human ERAD networks through an integrative mapping strategy.
  findings:
  - statement: Affinity-MS ERAD-network mapping that first identified the EMC (including EMC1) in human cells and localized it to the ER membrane.
    reference_section_type: ABSTRACT
  reference_review:
    relevance: HIGH
    correctness: VERIFIED
    review_notes: Foundational identification of the human EMC; source of EMC complex membership and ER membrane localization for EMC1.
- id: PMID:28246125
  title: ZMPSTE24 defends against influenza and other pathogenic viruses.
  findings:
  - statement: Antiviral study of ZMPSTE24/IFITM; EMC1 appears only as a co-purifying generic protein-containing complex component (MGI IDA), not as a functional subject.
    reference_section_type: RESULTS
  reference_review:
    relevance: LOW
    correctness: VERIFIED
    review_notes: Paper is about ZMPSTE24 antiviral defense; the EMC1 GO:0032991 annotation is an incidental generic complex co-purification, a parent of the EMC complex term.
- id: PMID:29242231
  title: The ER membrane protein complex is a transmembrane domain insertase.
  findings:
  - statement: The EMC is a transmembrane domain insertase that post-translationally inserts tail-anchored membrane proteins; reconstituted in liposomes.
    reference_section_type: ABSTRACT
  reference_review:
    relevance: HIGH
    correctness: VERIFIED
    review_notes: Establishes the insertase function of the EMC; basis for the insertion BP/MF annotations.
- id: PMID:29809151
  title: The ER membrane protein complex interacts cotranslationally to enable biogenesis
    of multipass membrane proteins.
  findings:
  - statement: The EMC engages multipass membrane protein clients cotranslationally to enable their biogenesis.
    reference_section_type: ABSTRACT
  reference_review:
    relevance: HIGH
    correctness: VERIFIED
    review_notes: Cotranslational multipass biogenesis role of the EMC.
- id: PMID:30415835
  title: EMC Is Required to Initiate Accurate Membrane Protein Topogenesis.
  findings:
  - statement: The EMC sets the N-exo topology of the first TMD of GPCRs and other multipass proteins, cooperating with Sec61.
    reference_section_type: ABSTRACT
  reference_review:
    relevance: HIGH
    correctness: VERIFIED
    review_notes: Topogenesis/orientation role of the EMC; GPCR clients.
- id: PMID:32353859
  title: A SARS-CoV-2 protein interaction map reveals targets for drug repurposing.
  findings: []
  reference_review:
    relevance: LOW
    correctness: VERIFIED
    review_notes: High-throughput virus-host interactome; source of an IPI protein-binding annotation (viral ORF8/P0DTC8).
- id: PMID:32439656
  title: Structural basis for membrane insertion by the human ER membrane protein
    complex.
  findings:
  - statement: Cryo-EM structure of the human EMC; substrate insertion occurs via an enclosed hydrophilic vestibule formed by EMC3 and EMC6, while EMC1 is the large lumenal scaffold subunit.
    reference_section_type: ABSTRACT
  reference_review:
    relevance: HIGH
    correctness: VERIFIED
    review_notes: Structural basis for the EMC; confirms EMC1 is the non-catalytic lumenal scaffold. Abstract-only in cache.
- id: PMID:33060197
  title: Comparative host-coronavirus protein interaction networks reveal pan-viral
    disease mechanisms.
  findings: []
  reference_review:
    relevance: LOW
    correctness: VERIFIED
    review_notes: Comparative coronavirus interactome; source of an IPI protein-binding annotation (viral ORF8/P0DTC8).
- id: PMID:36217030
  title: A comprehensive SARS-CoV-2-human protein-protein interactome reveals COVID-19
    pathobiology and potential host therapeutic targets.
  findings: []
  reference_review:
    relevance: LOW
    correctness: VERIFIED
    review_notes: Comprehensive SARS-CoV-2-human interactome; source of an IPI protein-binding annotation (viral ORF8/P0DTC8).
- id: PMID:37196677
  title: "EMC chaperone-Ca(V) structure reveals an ion channel assembly intermediate."
  findings:
  - statement: Cryo-EM structures of human EMC bound to a CaV1.2-CaVbeta3 assembly intermediate define EMC client-binding sites (transmembrane and cytoplasmic docks), with EMC1 contributing to the TM dock that engages the channel; EMC acts as a holdase/chaperone whose binding is mutually exclusive with CaValpha2delta, indicating an ordered hand-off during channel assembly.
    reference_section_type: ABSTRACT
  reference_review:
    relevance: HIGH
    correctness: VERIFIED
    review_notes: PubMed-verified (Nature 2023, 619:410-419). First mammalian EMC-client structure; directly implicates the EMC1 lumenal/TM region in client docking and establishes the EMC holdase/chaperone mode beyond simple insertion. Supports EMC1's client-engagement scaffold role.
- id: PMID:37199759
  title: A selectivity filter in the ER membrane protein complex limits protein misinsertion
    at the ER.
  findings:
  - statement: Mapping of a tail-anchored substrate's path through the EMC reveals cytosolic capture by methionine-rich loops and insertion through a hydrophilic vestibule whose positively charged entrance acts as a charge-repulsion selectivity filter that rejects mitochondrial TA proteins and enforces the positive-inside topology rule.
    reference_section_type: ABSTRACT
  reference_review:
    relevance: MEDIUM
    correctness: VERIFIED
    review_notes: PubMed-verified (J Cell Biol 2023, 222:e202212007). Refines the EMC insertion/topogenesis mechanism (selectivity filter) underlying the EMC1-containing complex; complex-level rather than EMC1-specific.
- id: PMID:38517390
  title: Structural insights into human EMC and its interaction with VDAC.
  findings:
  - statement: Cryo-EM structures of human EMC in apo and VDAC-bound states (3.47 A and 3.32 A) identify a gating plug within the hydrophilic vestibule and a conserved EMC-VDAC interaction at mitochondria-ER contact sites; the VDAC-bound state appears not to be insertion-competent, supporting EMC multifunctionality.
    reference_section_type: ABSTRACT
  reference_review:
    relevance: MEDIUM
    correctness: VERIFIED
    review_notes: PubMed-verified (Aging (Albany NY) 2024, 16:5501-5525). Human EMC structures (EMC1 is the large lumenal subunit) and a new ER-mitochondria contact-site interaction with VDAC; complex-level structural context for EMC1.
- id: PMID:38784058
  title: Tribal Founder EMC1 Variant in 5 Kuwaiti Families Expands Phenotypic Spectrum
    of EMC1-Related Disorder.
  findings:
  - statement: Eight individuals from 5 Kuwaiti families homozygous for the EMC1 c.245C>T (p.Thr82Met) variant present with CAVIPMR (OMIM #616875); shared features include global developmental delay (8/8), microcephaly (8/8), truncal hypotonia (8/8), visual impairment (7/7), and failure to thrive (7/7), with chorea newly added to the phenotypic spectrum.
    reference_section_type: ABSTRACT
  reference_review:
    relevance: HIGH
    correctness: VERIFIED
    review_notes: PubMed-verified (Neurol Genet 2024, 10:e200156). EMC1-specific human genetics; expands the CAVIPMR phenotype and confirms p.Thr82Met pathogenicity, directly supporting EMC1's essential neurodevelopmental role.
- id: PMID:40753078
  title: The EMC acts as a chaperone for membrane proteins.
  findings:
  - statement: Interactomics and model-protein studies define an EMC chaperone function distinct from its insertase activity; the EMC engages client transmembrane domains via its EMC1 subunit and modulates their orientation in the lipid bilayer, with productive assembly reducing binding to the EMC chaperone site.
    reference_section_type: ABSTRACT
  reference_review:
    relevance: HIGH
    correctness: VERIFIED
    review_notes: PubMed-verified (Nat Commun 2025, 16:7097). Directly implicates EMC1 as the subunit engaging client TMDs in the EMC chaperone mode, strengthening EMC1's specific client-engagement role beyond a purely structural lumenal scaffold.