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- EMDB-34074: Cryo-EM structure of human FcmR bound to sIgM -

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Basic information

Entry
Database: EMDB / ID: EMD-34074
TitleCryo-EM structure of human FcmR bound to sIgM
Map data
Sample
  • Complex: Cryo-EM structure of human FcmR bound to sIgM
    • Complex: Immunoglobulin heavy constant mu
      • Protein or peptide: Immunoglobulin heavy constant mu
    • Complex: Immunoglobulin J chain
      • Protein or peptide: Immunoglobulin J chain
    • Complex: Secretory component
      • Protein or peptide: Secretory component
    • Complex: Fas apoptotic inhibitory molecule 3
      • Protein or peptide: Fas apoptotic inhibitory molecule 3
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
Keywordsimmunoglobin M / IMMUNE SYSTEM
Function / homology
Function and homology information


high-affinity IgM receptor activity / immunoglobulin transcytosis in epithelial cells / IgM binding / polymeric immunoglobulin receptor activity / immunoglobulin transcytosis in epithelial cells mediated by polymeric immunoglobulin receptor / hexameric IgM immunoglobulin complex / polymeric immunoglobulin binding / regulation of B cell receptor signaling pathway / dimeric IgA immunoglobulin complex / IgM B cell receptor complex ...high-affinity IgM receptor activity / immunoglobulin transcytosis in epithelial cells / IgM binding / polymeric immunoglobulin receptor activity / immunoglobulin transcytosis in epithelial cells mediated by polymeric immunoglobulin receptor / hexameric IgM immunoglobulin complex / polymeric immunoglobulin binding / regulation of B cell receptor signaling pathway / dimeric IgA immunoglobulin complex / IgM B cell receptor complex / secretory dimeric IgA immunoglobulin complex / monomeric IgA immunoglobulin complex / pentameric IgM immunoglobulin complex / Fc receptor-mediated immune complex endocytosis / secretory IgA immunoglobulin complex / Fc receptor signaling pathway / IgA binding / pre-B cell allelic exclusion / IgM immunoglobulin complex / glomerular filtration / detection of chemical stimulus involved in sensory perception of bitter taste / humoral immune response mediated by circulating immunoglobulin / CD22 mediated BCR regulation / immunoglobulin receptor binding / azurophil granule membrane / receptor clustering / positive regulation of respiratory burst / humoral immune response / cellular defense response / Scavenging of heme from plasma / antigen binding / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / trans-Golgi network membrane / Cell surface interactions at the vascular wall / B cell receptor signaling pathway / epidermal growth factor receptor signaling pathway / transmembrane signaling receptor activity / antibacterial humoral response / protein-containing complex assembly / early endosome membrane / blood microparticle / protein-macromolecule adaptor activity / defense response to Gram-negative bacterium / Potential therapeutics for SARS / adaptive immune response / receptor complex / immune response / innate immune response / lysosomal membrane / Neutrophil degranulation / centrosome / negative regulation of apoptotic process / cell surface / Golgi apparatus / signal transduction / protein homodimerization activity / extracellular space / extracellular exosome / extracellular region / nucleoplasm / plasma membrane
Similarity search - Function
Immunoglobulin J chain / Immunoglobulin J chain / : / : / Immunoglobulin V-Type / Immunoglobulin V-set domain / Immunoglobulin V-set domain / Immunoglobulin/major histocompatibility complex, conserved site / Immunoglobulins and major histocompatibility complex proteins signature. / Immunoglobulin subtype ...Immunoglobulin J chain / Immunoglobulin J chain / : / : / Immunoglobulin V-Type / Immunoglobulin V-set domain / Immunoglobulin V-set domain / 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
Similarity search - Domain/homology
Immunoglobulin mu Fc receptor / Immunoglobulin J chain / Polymeric immunoglobulin receptor / Immunoglobulin heavy constant mu
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.18 Å
AuthorsLi Y / Shen H / Xiao J
Funding support China, 1 items
OrganizationGrant numberCountry
National Science Foundation (NSF, China) China
CitationJournal: Nature / Year: 2023
Title: Immunoglobulin M perception by FcμR.
Authors: Yaxin Li / Hao Shen / Ruixue Zhang / Chenggong Ji / Yuxin Wang / Chen Su / Junyu Xiao /
Abstract: Immunoglobulin M (IgM) is the first antibody to emerge during embryonic development and the humoral immune response. IgM can exist in several distinct forms, including monomeric, membrane-bound IgM ...Immunoglobulin M (IgM) is the first antibody to emerge during embryonic development and the humoral immune response. IgM can exist in several distinct forms, including monomeric, membrane-bound IgM within the B cell receptor (BCR) complex, pentameric and hexameric IgM in serum and secretory IgM on the mucosal surface. FcμR, the only IgM-specific receptor in mammals, recognizes different forms of IgM to regulate diverse immune responses. However, the underlying molecular mechanisms remain unknown. Here we delineate the structural basis of the FcμR-IgM interaction by crystallography and cryo-electron microscopy. We show that two FcμR molecules interact with a Fcμ-Cμ4 dimer, suggesting that FcμR can bind to membrane-bound IgM with a 2:1 stoichiometry. Further analyses reveal that FcμR-binding sites are accessible in the context of IgM BCR. By contrast, pentameric IgM can recruit four FcμR molecules to bind on the same side and thereby facilitate the formation of an FcμR oligomer. One of these FcμR molecules occupies the binding site of the secretory component. Nevertheless, four FcμR molecules bind to the other side of secretory component-containing secretory IgM, consistent with the function of FcμR in the retrotransport of secretory IgM. These results reveal intricate mechanisms of IgM perception by FcμR.
History
DepositionAug 12, 2022-
Header (metadata) releaseFeb 1, 2023-
Map releaseFeb 1, 2023-
UpdateJul 2, 2025-
Current statusJul 2, 2025Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_34074.png

Downloads & links

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Map

FileDownload / File: emd_34074.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.08 Å/pix.
x 320 pix.
= 345.6 Å		1.08 Å/pix.
x 320 pix.
= 345.6 Å		1.08 Å/pix.
x 320 pix.
= 345.6 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.08 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.27
Minimum - Maximum-1.2079669 - 2.3084886
Average (Standard dev.)0.00030271284 (±0.04766456)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 345.6 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_34074_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_34074_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Cryo-EM structure of human FcmR bound to sIgM

EntireName: Cryo-EM structure of human FcmR bound to sIgM
Components
  • Complex: Cryo-EM structure of human FcmR bound to sIgM
    • Complex: Immunoglobulin heavy constant mu
      • Protein or peptide: Immunoglobulin heavy constant mu
    • Complex: Immunoglobulin J chain
      • Protein or peptide: Immunoglobulin J chain
    • Complex: Secretory component
      • Protein or peptide: Secretory component
    • Complex: Fas apoptotic inhibitory molecule 3
      • Protein or peptide: Fas apoptotic inhibitory molecule 3
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose

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Supramolecule #1: Cryo-EM structure of human FcmR bound to sIgM

SupramoleculeName: Cryo-EM structure of human FcmR bound to sIgM / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #2: Immunoglobulin heavy constant mu

SupramoleculeName: Immunoglobulin heavy constant mu / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #3: Immunoglobulin J chain

SupramoleculeName: Immunoglobulin J chain / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #2
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #4: Secretory component

SupramoleculeName: Secretory component / type: complex / ID: 4 / Parent: 1 / Macromolecule list: #3
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #5: Fas apoptotic inhibitory molecule 3

SupramoleculeName: Fas apoptotic inhibitory molecule 3 / type: complex / ID: 5 / Parent: 1 / Macromolecule list: #4

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Macromolecule #1: Immunoglobulin heavy constant mu

MacromoleculeName: Immunoglobulin heavy constant mu / type: protein_or_peptide / ID: 1 / Number of copies: 10 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 25.611771 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: IRVFAIPPSF ASIFLTKSTK LTCLVTDLTT YDSVTISWTR QNGEAVKTHT NISESHPNAT FSAVGEASIC EDDWNSGERF TCTVTHTDL PSPLKQTISR PKGVALHRPD VYLLPPAREQ LNLRESATIT CLVTGFSPAD VFVQWMQRGQ PLSPEKYVTS A PMPEPQAP ...String:
IRVFAIPPSF ASIFLTKSTK LTCLVTDLTT YDSVTISWTR QNGEAVKTHT NISESHPNAT FSAVGEASIC EDDWNSGERF TCTVTHTDL PSPLKQTISR PKGVALHRPD VYLLPPAREQ LNLRESATIT CLVTGFSPAD VFVQWMQRGQ PLSPEKYVTS A PMPEPQAP GRYFAHSILT VSEEEWNTGE TYTCVVAHEA LPNRVTERTV DKSTGKPTLY NVSLVMSDTA GTCY

UniProtKB: Immunoglobulin heavy constant mu

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Macromolecule #2: Immunoglobulin J chain

MacromoleculeName: Immunoglobulin J chain / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 15.483329 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString:
EDERIVLVDN KCKCARITSR IIRSSEDPNE DIVERNIRII VPLNNRENIS DPTSPLRTRF VYHLSDLCKK CDPTEVELDN QIVTATQSN ICDEDSATET CYTYDRNKCY TAVVPLVYGG ETKMVETALT PDACYPD

UniProtKB: Immunoglobulin J chain

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Macromolecule #3: Secretory component

MacromoleculeName: Secretory component / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 59.58191 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: KSPIFGPEEV NSVEGNSVSI TCYYPPTSVN RHTRKYWCRQ GARGGCITLI SSEGYVSSKY AGRANLTNFP ENGTFVVNIA QLSQDDSGR YKCGLGINSR GLSFDVSLEV SQGPGLLNDT KVYTVDLGRT VTINCPFKTE NAQKRKSLYK QIGLYPVLVI D SSGYVNPN ...String:
KSPIFGPEEV NSVEGNSVSI TCYYPPTSVN RHTRKYWCRQ GARGGCITLI SSEGYVSSKY AGRANLTNFP ENGTFVVNIA QLSQDDSGR YKCGLGINSR GLSFDVSLEV SQGPGLLNDT KVYTVDLGRT VTINCPFKTE NAQKRKSLYK QIGLYPVLVI D SSGYVNPN YTGRIRLDIQ GTGQLLFSVV INQLRLSDAG QYLCQAGDDS NSNKKNADLQ VLKPEPELVY EDLRGSVTFH CA LGPEVAN VAKFLCRQSS GENCDVVVNT LGKRAPAFEG RILLNPQDKD GSFSVVITGL RKEDAGRYLC GAHSDGQLQE GSP IQAWQL FVNEESTIPR SPTVVKGVAG GSVAVLCPYN RKESKSIKYW CLWEGAQNGR CPLLVDSEGW VKAQYEGRLS LLEE PGNGT FTVILNQLTS RDAGFYWCLT NGDTLWRTTV EIKIIEGEPN LKVPGNVTAV LGETLKVPCH FPCKFSSYEK YWCKW NNTG CQALPSQDEG PSKAFVNCDE NSRLVSLTLN LVTRADEGWY WCGVKQGHFY GETAAVY

UniProtKB: Polymeric immunoglobulin receptor

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Macromolecule #4: Fas apoptotic inhibitory molecule 3

MacromoleculeName: Fas apoptotic inhibitory molecule 3 / type: protein_or_peptide / ID: 4 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 11.723567 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString:
RILPEVKVEG ELGGSVTIKC PLPEMHVRIY LCREMAGSGT CGTVVSTTNF IKAEYKGRVT LKQYPRKNLF LVEVTQLTES DSGVYACGA GMNTDRGKTQ KVTLNVHS

UniProtKB: Immunoglobulin mu Fc receptor

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Macromolecule #6: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 6 / Number of copies: 10 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.4
VitrificationCryogen name: ETHANE / Chamber humidity: 100 %

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.5 µm / Nominal defocus min: 1.0 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

6kxs

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.18 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 297136
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION

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