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- PDB-8c1b: Focused map for structure of IgE bound to the ectodomain of FceRIa -

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Basic information

Entry
Database: PDB / ID: 8c1b
TitleFocused map for structure of IgE bound to the ectodomain of FceRIa
Components
  • High affinity immunoglobulin epsilon receptor subunit alpha
  • Immunoglobulin heavy constant epsilon
KeywordsIMMUNE SYSTEM / adaptive immune system / IgE / Fc receptor / allergy
Function / homology
Function and homology information


high-affinity IgE receptor activity / adaptive immune memory response / primary adaptive immune response / IgE B cell receptor complex / B cell antigen processing and presentation / type I hypersensitivity / Fc receptor-mediated immune complex endocytosis / eosinophil degranulation / IgE immunoglobulin complex / macrophage activation ...high-affinity IgE receptor activity / adaptive immune memory response / primary adaptive immune response / IgE B cell receptor complex / B cell antigen processing and presentation / type I hypersensitivity / Fc receptor-mediated immune complex endocytosis / eosinophil degranulation / IgE immunoglobulin complex / macrophage activation / IgE binding / Fc epsilon receptor (FCERI) signaling / antibody-dependent cellular cytotoxicity / type 2 immune response / immunoglobulin receptor binding / immunoglobulin complex, circulating / mast cell degranulation / immunoglobulin mediated immune response / B cell proliferation / macrophage differentiation / Role of LAT2/NTAL/LAB on calcium mobilization / complement activation, classical pathway / antigen binding / FCERI mediated Ca+2 mobilization / B cell receptor signaling pathway / FCERI mediated MAPK activation / FCERI mediated NF-kB activation / antibacterial humoral response / Interleukin-4 and Interleukin-13 signaling / adaptive immune response / cell surface receptor signaling pathway / immune response / inflammatory response / external side of plasma membrane / cell surface / extracellular space / extracellular region / plasma membrane
Similarity search - Function
: / Immunoglobulin domain / Immunoglobulin domain / : / Immunoglobulin subtype 2 / Immunoglobulin C-2 Type / Immunoglobulin/major histocompatibility complex, conserved site / Immunoglobulins and major histocompatibility complex proteins signature. / Immunoglobulin subtype / Immunoglobulin ...: / Immunoglobulin domain / Immunoglobulin domain / : / Immunoglobulin subtype 2 / Immunoglobulin C-2 Type / Immunoglobulin/major histocompatibility complex, conserved site / Immunoglobulins and major histocompatibility complex proteins signature. / Immunoglobulin subtype / Immunoglobulin / Immunoglobulin C-Type / Immunoglobulin C1-set / Immunoglobulin C1-set domain / Ig-like domain profile. / Immunoglobulin-like domain / Immunoglobulin-like domain superfamily / Immunoglobulin-like fold / Immunoglobulins / Immunoglobulin-like / Sandwich / Mainly Beta
Similarity search - Domain/homology
Immunoglobulin heavy constant epsilon / High affinity immunoglobulin epsilon receptor subunit alpha
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.8 Å
AuthorsAndersen, G.R. / Jensen, R.K.
Funding support Denmark, 3items
OrganizationGrant numberCountry
Novo Nordisk FoundationNNF18OC0052105 Denmark
LundbeckfondenR155-2015-2666 Denmark
Danish Council for Independent Research0135-00061B Denmark
CitationJournal: To Be Published
Title: Structure of IgE bound to the ectodomain of FceRIa
Authors: Andersen, G.R. / Jensen, R.K.
History
DepositionDec 20, 2022Deposition site: PDBE / Processing site: PDBE
Revision 1.0Mar 29, 2023Provider: repository / Type: Initial release
Revision 1.0Mar 29, 2023Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Mar 29, 2023Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Mar 29, 2023Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Mar 29, 2023Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Mar 29, 2023Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.0Mar 29, 2023Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Mar 29, 2023Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Mar 29, 2023Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Mar 29, 2023Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.1Nov 6, 2024Group: Data collection / Structure summary
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification
Revision 1.2Jul 9, 2025Group: Data collection / Category: em_admin / em_software / Item: _em_admin.last_update / _em_software.name
Revision 1.1Jul 9, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
H: Immunoglobulin heavy constant epsilon
R: High affinity immunoglobulin epsilon receptor subunit alpha
X: Immunoglobulin heavy constant epsilon
hetero molecules


Theoretical massNumber of molelcules
Total (without water)93,5879
Polymers90,5153
Non-polymers3,0726
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: SAXS
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area11620 Å2
ΔGint27 kcal/mol
Surface area41700 Å2
MethodPISA

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Components

#1: Protein Immunoglobulin heavy constant epsilon / Ig epsilon chain C region / Ig epsilon chain C region ND


Mass: 35444.715 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: IGHE / Cell line (production host): HEK293 / Production host: Homo sapiens (human) / References: UniProt: P01854
#2: Protein High affinity immunoglobulin epsilon receptor subunit alpha / Fc-epsilon RI-alpha / FcERI / IgE Fc receptor subunit alpha


Mass: 19625.762 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: FCER1A, FCE1A / Cell line (production host): HEK293 / Production host: Homo sapiens (human) / References: UniProt: P12319
#3: Polysaccharide alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2- ...alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 910.823 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-3[DManpa1-6]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/3,5,4/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3-3/a4-b1_b4-c1_c3-d1_c6-e1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{}[(6+1)][a-D-Manp]{}}}}}LINUCSPDB-CARE
#4: Polysaccharide alpha-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta- ...alpha-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.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-4DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/2,3,2/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1a_1-5]/1-1-2/a4-b1_b4-c1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][a-D-Manp]{}}}}LINUCSPDB-CARE
#5: Sugar ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0
Has ligand of interestN
Has protein modificationY

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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: IgE-FceRIa complex / Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Molecular weightValue: 0.22 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.5
SpecimenConc.: 3.1 mg/ml / Embedding 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 FIELD / Nominal magnification: 105000 X / Nominal defocus max: 1800 nm / Nominal defocus min: 500 nm / Cs: 2.7 mm / C2 aperture diameter: 70 µm
Image recordingElectron dose: 59.16 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.20.1_4487: / Classification: refinement
EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 573328 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0076731
ELECTRON MICROSCOPYf_angle_d1.2479174
ELECTRON MICROSCOPYf_dihedral_angle_d6.423995
ELECTRON MICROSCOPYf_chiral_restr0.0661073
ELECTRON MICROSCOPYf_plane_restr0.0091160

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