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- PDB-7yg2: Cryo-EM structure of human IgM-Fc in complex with the J chain and... -

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Basic information

Entry
Database: PDB / ID: 7yg2
TitleCryo-EM structure of human IgM-Fc in complex with the J chain and the DBL domain of DBLMSP2
Components
  • DBLMSP2
  • Immunoglobulin J chain
  • Immunoglobulin heavy constant mu
KeywordsIMMUNE SYSTEM / malaria / immunoglobin
Function / homology
Function and homology information


hexameric IgM immunoglobulin complex / IgM B cell receptor complex / dimeric IgA immunoglobulin complex / secretory dimeric IgA immunoglobulin complex / pentameric IgM immunoglobulin complex / monomeric IgA immunoglobulin complex / secretory IgA immunoglobulin complex / IgA binding / pre-B cell allelic exclusion / IgM immunoglobulin complex ...hexameric IgM immunoglobulin complex / IgM B cell receptor complex / dimeric IgA immunoglobulin complex / secretory dimeric IgA immunoglobulin complex / pentameric IgM immunoglobulin complex / monomeric IgA immunoglobulin complex / secretory IgA immunoglobulin complex / IgA binding / pre-B cell allelic exclusion / IgM immunoglobulin complex / glomerular filtration / CD22 mediated BCR regulation / immunoglobulin receptor binding / immunoglobulin complex, circulating / positive regulation of respiratory burst / humoral immune response / Scavenging of heme from plasma / complement activation, classical pathway / antigen binding / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / Cell surface interactions at the vascular wall / B cell receptor signaling pathway / antibacterial humoral response / protein-macromolecule adaptor activity / protein-containing complex assembly / defense response to Gram-negative bacterium / blood microparticle / adaptive immune response / Potential therapeutics for SARS / host cell surface receptor binding / immune response / innate immune response / cell surface / protein homodimerization activity / extracellular space / extracellular exosome / extracellular region / membrane / plasma membrane
Similarity search - Function
Immunoglobulin J chain / Immunoglobulin J chain / Duffy-antigen binding / Duffy-antigen binding superfamily / Duffy binding domain / : / Immunoglobulin/major histocompatibility complex, conserved site / Immunoglobulins and major histocompatibility complex proteins signature. / Immunoglobulin C-Type / Immunoglobulin C1-set ...Immunoglobulin J chain / Immunoglobulin J chain / Duffy-antigen binding / Duffy-antigen binding superfamily / Duffy binding domain / : / Immunoglobulin/major histocompatibility complex, conserved site / Immunoglobulins and major histocompatibility complex proteins signature. / 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
DBLMSP2 / Immunoglobulin J chain / Immunoglobulin heavy constant mu
Similarity search - Component
Biological speciesPlasmodium falciparum (malaria parasite P. falciparum)
Homo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.32 Å
AuthorsShen, H. / Ji, C. / Xiao, J.
Funding support China, 1items
OrganizationGrant numberCountry
National Science Foundation (NSF, China) China
CitationJournal: Nat Commun / Year: 2023
Title: Plasmodium falciparum has evolved multiple mechanisms to hijack human immunoglobulin M.
Authors: Chenggong Ji / Hao Shen / Chen Su / Yaxin Li / Shihua Chen / Thomas H Sharp / Junyu Xiao /
Abstract: Plasmodium falciparum causes the most severe malaria in humans. Immunoglobulin M (IgM) serves as the first line of humoral defense against infection and potently activates the complement pathway to ...Plasmodium falciparum causes the most severe malaria in humans. Immunoglobulin M (IgM) serves as the first line of humoral defense against infection and potently activates the complement pathway to facilitate P. falciparum clearance. A number of P. falciparum proteins bind IgM, leading to immune evasion and severe disease. However, the underlying molecular mechanisms remain unknown. Here, using high-resolution cryo-electron microscopy, we delineate how P. falciparum proteins VAR2CSA, TM284VAR1, DBLMSP, and DBLMSP2 target IgM. Each protein binds IgM in a different manner, and together they present a variety of Duffy-binding-like domain-IgM interaction modes. We further show that these proteins interfere directly with IgM-mediated complement activation in vitro, with VAR2CSA exhibiting the most potent inhibitory effect. These results underscore the importance of IgM for human adaptation of P. falciparum and provide critical insights into its immune evasion mechanism.
History
DepositionJul 9, 2022Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Mar 29, 2023Provider: repository / Type: Initial release
Revision 1.1Oct 11, 2023Group: Data collection / Database references
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.pdbx_database_id_DOI / _citation.title / _citation.year
Revision 1.2May 8, 2024Group: Database references / Category: citation
Item: _citation.page_last / _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.3Oct 9, 2024Group: Data collection / Structure summary
Category: em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
M: DBLMSP2
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
K: Immunoglobulin heavy constant mu
L: Immunoglobulin heavy constant mu
J: Immunoglobulin J chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)473,18323
Polymers470,54712
Non-polymers2,63611
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein DBLMSP2


Mass: 36305.992 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Plasmodium falciparum (malaria parasite P. falciparum)
Gene: DBLMSP2 / Cell line (production host): HEK293 / Production host: Homo sapiens (human) / References: UniProt: A0A0A7MCY3
#2: 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: 41875.766 Da / Num. of mol.: 10
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: IGHM / Cell line (production host): HEK293 / Production host: Homo sapiens (human) / References: UniProt: P01871
#3: 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
#4: 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
#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.: 10 / Source method: obtained synthetically / 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
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
1Ternary complex of human IgM-Fc with the J chain and the DBL domain of DBLMSP2COMPLEX#1-#30RECOMBINANT
2Putative erythrocyte membrane proteinCOMPLEX#11RECOMBINANT
3Immunoglobulin heavy constant muCOMPLEX#21RECOMBINANT
4Immunoglobulin J chainCOMPLEX#31RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
21Plasmodium falciparum (malaria parasite P. falciparum)5833
32Homo sapiens (human)9606
43Homo sapiens (human)9606
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-ID
21Homo sapiens (human)9606
32Homo sapiens (human)9606
43Homo sapiens (human)9606
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: 1100 nm
Image recordingElectron dose: 60 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.19.2_4158: / Classification: refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.32 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 458396 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00321291
ELECTRON MICROSCOPYf_angle_d0.58429089
ELECTRON MICROSCOPYf_dihedral_angle_d6.6042895
ELECTRON MICROSCOPYf_chiral_restr0.0453415
ELECTRON MICROSCOPYf_plane_restr0.0063712

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