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- PDB-8j0n: cryo-EM structure of human EMC -

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Basic information

Entry
Database: PDB / ID: 8j0n
Titlecryo-EM structure of human EMC
Components(ER membrane protein complex subunit ...Endoplasmic reticulum) x 9
KeywordsMEMBRANE PROTEIN / ER membrane protein complex
Function / homology
Function and homology information


inorganic cation transmembrane transporter activity / extrinsic component of endoplasmic reticulum membrane / EMC complex / omegasome membrane / protein insertion into ER membrane by stop-transfer membrane-anchor sequence / magnesium ion transport / cobalt ion transmembrane transporter activity / tail-anchored membrane protein insertion into ER membrane / Miscellaneous transport and binding events / magnesium ion transmembrane transporter activity ...inorganic cation transmembrane transporter activity / extrinsic component of endoplasmic reticulum membrane / EMC complex / omegasome membrane / protein insertion into ER membrane by stop-transfer membrane-anchor sequence / magnesium ion transport / cobalt ion transmembrane transporter activity / tail-anchored membrane protein insertion into ER membrane / Miscellaneous transport and binding events / magnesium ion transmembrane transporter activity / ferrous iron transmembrane transporter activity / copper ion transport / autophagosome assembly / RHOA GTPase cycle / positive regulation of endothelial cell proliferation / positive regulation of endothelial cell migration / positive regulation of angiogenesis / early endosome membrane / carbohydrate binding / angiogenesis / early endosome / Golgi membrane / apoptotic process / endoplasmic reticulum membrane / Golgi apparatus / endoplasmic reticulum / protein-containing complex / extracellular region / membrane / plasma membrane / cytoplasm
Similarity search - Function
ER membrane protein complex subunit 8/9 / Uncharacterised protein family (UPF0172) / TMEM85/ER membrane protein complex subunit 4 / Protein of unknown function (DUF1077) / ER membrane protein complex subunit 7, beta-sandwich domain / ER membrane protein complex subunit 7 / ER membrane protein complex subunit 7, beta-sandwich domain / ER membrane protein complex subunit 6 / ER membrane protein complex subunit 3 / ER membrane protein complex subunit 1, C-terminal ...ER membrane protein complex subunit 8/9 / Uncharacterised protein family (UPF0172) / TMEM85/ER membrane protein complex subunit 4 / Protein of unknown function (DUF1077) / ER membrane protein complex subunit 7, beta-sandwich domain / ER membrane protein complex subunit 7 / ER membrane protein complex subunit 7, beta-sandwich domain / ER membrane protein complex subunit 6 / ER membrane protein complex subunit 3 / ER membrane protein complex subunit 1, C-terminal / Membrane magnesium transporter / ER membrane protein complex subunit 1 / ER membrane protein complex subunit 6-like / EMC6 / ER membrane protein complex subunit 1, C-terminal / Membrane magnesium transporter / ER membrane protein complex subunit 10 / ER membrane protein complex subunit 2-like / Integral membrane protein EMC3/TMCO1-like / Integral membrane protein EMC3/TMCO1-like / Integral membrane protein DUF106 / Pyrrolo-quinoline quinone repeat / PQQ-like domain / Carbohydrate-binding-like fold / Tetratricopeptide repeat / Quinoprotein alcohol dehydrogenase-like superfamily / TPR repeat region circular profile. / TPR repeat profile. / MPN domain / MPN domain profile. / Tetratricopeptide repeats / Tetratricopeptide repeat / Tetratricopeptide-like helical domain superfamily / WD40/YVTN repeat-like-containing domain superfamily
Similarity search - Domain/homology
ER membrane protein complex subunit 8 / ER membrane protein complex subunit 2 / ER membrane protein complex subunit 4 / ER membrane protein complex subunit 10 / ER membrane protein complex subunit 5 / ER membrane protein complex subunit 1 / ER membrane protein complex subunit 6 / Endoplasmic reticulum membrane protein complex subunit 7 / ER membrane protein complex subunit 3
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.47 Å
AuthorsLi, M. / Zhang, C. / Wu, J. / Lei, M.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)31930063 China
CitationJournal: Aging (Albany NY) / Year: 2024
Title: Structural insights into human EMC and its interaction with VDAC.
Authors: Mingyue Li / Chunli Zhang / Yuntao Xu / Shaobai Li / Chenhui Huang / Jian Wu / Ming Lei /
Abstract: The endoplasmic reticulum (ER) membrane protein complex (EMC) is a conserved, multi-subunit complex acting as an insertase at the ER membrane. Growing evidence shows that the EMC is also involved in ...The endoplasmic reticulum (ER) membrane protein complex (EMC) is a conserved, multi-subunit complex acting as an insertase at the ER membrane. Growing evidence shows that the EMC is also involved in stabilizing and trafficking membrane proteins. However, the structural basis and regulation of its multifunctionality remain elusive. Here, we report cryo-electron microscopy structures of human EMC in apo- and voltage-dependent anion channel (VDAC)-bound states at resolutions of 3.47 Å and 3.32 Å, respectively. We discovered a specific interaction between VDAC proteins and the EMC at mitochondria-ER contact sites, which is conserved from yeast to humans. Moreover, we identified a gating plug located inside the EMC hydrophilic vestibule, the substrate-binding pocket for client insertion. Conformation changes of this gating plug during the apo-to-VDAC-bound transition reveal that the EMC unlikely acts as an insertase in the VDAC1-bound state. Based on the data analysis, the gating plug may regulate EMC functions by modifying the hydrophilic vestibule in different states. Our discovery offers valuable insights into the structural basis of EMC's multifunctionality.
History
DepositionApr 11, 2023Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Apr 3, 2024Provider: repository / Type: Initial release
Revision 1.1Apr 17, 2024Group: Database references / Category: citation / Item: _citation.page_first / _citation.page_last

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: ER membrane protein complex subunit 1
B: ER membrane protein complex subunit 2
C: ER membrane protein complex subunit 3
D: ER membrane protein complex subunit 4
E: ER membrane protein complex subunit 5
F: ER membrane protein complex subunit 6
G: ER membrane protein complex subunit 7
H: ER membrane protein complex subunit 8
J: ER membrane protein complex subunit 10
hetero molecules


Theoretical massNumber of molelcules
Total (without water)297,44112
Polymers295,6819
Non-polymers1,7603
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: mass spectrometry
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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ER membrane protein complex subunit ... , 9 types, 9 molecules ABCDEFGHJ

#1: Protein ER membrane protein complex subunit 1 / Endoplasmic reticulum


Mass: 111886.141 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q8N766
#2: Protein ER membrane protein complex subunit 2 / Endoplasmic reticulum / Tetratricopeptide repeat protein 35 / TPR repeat protein 35


Mass: 34882.531 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q15006
#3: Protein ER membrane protein complex subunit 3 / Endoplasmic reticulum / Transmembrane protein 111


Mass: 29981.924 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q9P0I2
#4: Protein ER membrane protein complex subunit 4 / Endoplasmic reticulum / Cell proliferation-inducing gene 17 protein / Transmembrane protein 85


Mass: 20104.572 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q5J8M3
#5: Protein ER membrane protein complex subunit 5 / Endoplasmic reticulum / Membrane magnesium transporter 1 / Transmembrane protein 32


Mass: 14706.786 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q8N4V1
#6: Protein ER membrane protein complex subunit 6 / Endoplasmic reticulum / Transmembrane protein 93


Mass: 12029.248 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q9BV81
#7: Protein ER membrane protein complex subunit 7 / Endoplasmic reticulum


Mass: 26501.586 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q9NPA0
#8: Protein ER membrane protein complex subunit 8 / Endoplasmic reticulum / Neighbor of COX4 / Protein FAM158B


Mass: 23807.076 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: O43402
#9: Protein ER membrane protein complex subunit 10 / Endoplasmic reticulum / Hematopoietic signal peptide-containing membrane domain-containing protein 1


Mass: 21781.484 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q5UCC4

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Sugars , 1 types, 3 molecules

#10: Polysaccharide beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta- ...beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 586.542 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/2,3,2/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5]/1-1-2/a4-b1_b4-c1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{}}}LINUCSPDB-CARE

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Details

Has ligand of interestN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: EMC / Type: COMPLEX / Entity ID: #1-#9 / Source: NATURAL
Source (natural)Organism: Homo sapiens (human)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2500 nm / Nominal defocus min: 1200 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.20.1_4487: / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.47 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 693381 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0118890
ELECTRON MICROSCOPYf_angle_d0.88625591
ELECTRON MICROSCOPYf_dihedral_angle_d3.8132567
ELECTRON MICROSCOPYf_chiral_restr0.0432889
ELECTRON MICROSCOPYf_plane_restr0.0063236

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