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- PDB-7ysg: Cryo-EM structure of human FcmR bound to sIgM -

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Basic information

Entry
Database: PDB / ID: 7ysg
TitleCryo-EM structure of human FcmR bound to sIgM
Components
  • (Immunoglobulin ...) x 2
  • Fas apoptotic inhibitory molecule 3
  • Secretory component
KeywordsIMMUNE SYSTEM / immunoglobin M
Function / homology
Function and homology information


high-affinity IgM receptor activity / immunoglobulin transcytosis in epithelial cells / IgM binding / hexameric IgM immunoglobulin complex / polymeric immunoglobulin receptor activity / immunoglobulin transcytosis in epithelial cells mediated by polymeric immunoglobulin receptor / regulation of B cell receptor signaling pathway / polymeric immunoglobulin binding / IgM B cell receptor complex / dimeric IgA immunoglobulin complex ...high-affinity IgM receptor activity / immunoglobulin transcytosis in epithelial cells / IgM binding / hexameric IgM immunoglobulin complex / polymeric immunoglobulin receptor activity / immunoglobulin transcytosis in epithelial cells mediated by polymeric immunoglobulin receptor / regulation of B cell receptor signaling pathway / polymeric immunoglobulin binding / IgM B cell receptor complex / dimeric IgA immunoglobulin complex / secretory dimeric IgA immunoglobulin complex / pentameric IgM immunoglobulin complex / monomeric IgA 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 / protein-macromolecule adaptor activity / defense response to Gram-negative bacterium / blood microparticle / 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 / Immunoglobulins / Immunoglobulin-like / Sandwich / Mainly Beta
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)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.18 Å
AuthorsLi, Y. / Shen, H. / Xiao, J.
Funding support China, 1items
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, 2022Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Feb 1, 2023Provider: repository / Type: Initial release
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Revision 1.3Nov 20, 2024Group: Data collection / Structure summary
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Immunoglobulin heavy constant mu
B: Immunoglobulin heavy constant mu
C: Immunoglobulin heavy constant mu
D: Immunoglobulin heavy constant mu
E: Immunoglobulin heavy constant mu
F: Immunoglobulin heavy constant mu
G: Immunoglobulin heavy constant mu
H: Immunoglobulin heavy constant mu
J: Immunoglobulin J chain
K: Immunoglobulin heavy constant mu
L: Immunoglobulin heavy constant mu
P: Secretory component
R: Fas apoptotic inhibitory molecule 3
S: Fas apoptotic inhibitory molecule 3
U: Fas apoptotic inhibitory molecule 3
V: Fas apoptotic inhibitory molecule 3
hetero molecules


Theoretical massNumber of molelcules
Total (without water)380,71427
Polymers378,07716
Non-polymers2,63611
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Immunoglobulin ... , 2 types, 11 molecules ABCDEFGHKLJ

#1: Protein
Immunoglobulin heavy constant mu / Ig mu chain C region / Ig mu chain C region BOT / Ig mu chain C region GAL / Ig mu chain C region OU


Mass: 25611.771 Da / Num. of mol.: 10
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Cell line (production host): HEK293 / Production host: Homo sapiens (human) / References: UniProt: P01871
#2: Protein Immunoglobulin J chain / Joining chain of multimeric IgA and IgM


Mass: 15483.329 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: JCHAIN, IGCJ, IGJ / Cell line (production host): HEK293 / Production host: Homo sapiens (human) / References: UniProt: P01591

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Protein , 2 types, 5 molecules PRSUV

#3: Protein Secretory component


Mass: 59581.910 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: PIGR / Cell line (production host): HEK293 / Production host: Homo sapiens (human) / References: UniProt: P01833
#4: Protein
Fas apoptotic inhibitory molecule 3 / IgM Fc fragment receptor / Regulator of Fas-induced apoptosis Toso


Mass: 11723.567 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: FCMR, FAIM3, TOSO / Production host: Trichoplusia ni (cabbage looper) / References: UniProt: O60667

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Sugars , 2 types, 11 molecules

#5: Polysaccharide 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}LINUCSPDB-CARE
#6: 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.: 10
Source method: isolated from a genetically manipulated source
Formula: C8H15NO6 / Feature type: SUBJECT OF INVESTIGATION
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

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Details

Has ligand of interestY
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

Component
IDNameTypeEntity IDParent-IDSource
1Cryo-EM structure of human FcmR bound to sIgMCOMPLEX#1-#40RECOMBINANT
2Immunoglobulin heavy constant muCOMPLEX#11RECOMBINANT
3Immunoglobulin J chainCOMPLEX#21RECOMBINANT
4Secretory componentCOMPLEX#31RECOMBINANT
5Fas apoptotic inhibitory molecule 3COMPLEX#41RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
21Homo sapiens (human)9606
32Homo sapiens (human)9606
43Homo sapiens (human)9606
54Homo sapiens (human)9606
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-IDCell
21Homo sapiens (human)9606HEK293
32Homo sapiens (human)9606HEK293
43Homo sapiens (human)9606HEK293
54Trichoplusia ni (cabbage looper)7111
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE / Humidity: 100 %

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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 defocus max: 1500 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.19.1_4122: / Classification: refinement
EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.18 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 297136 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00326284
ELECTRON MICROSCOPYf_angle_d0.62835857
ELECTRON MICROSCOPYf_dihedral_angle_d5.7523609
ELECTRON MICROSCOPYf_chiral_restr0.0464209
ELECTRON MICROSCOPYf_plane_restr0.0064578

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