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- EMDB-33542: Cryo-EM structure of human IgM-Fc in complex with the J chain and... -
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Open data
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Basic information
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Title | Cryo-EM structure of human IgM-Fc in complex with the J chain and the P. falciparum VAR2CSA FCR3 | |||||||||
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![]() | Complex / antibody / IMMUNE SYSTEM | |||||||||
Function / homology | ![]() hexameric IgM immunoglobulin complex / dimeric IgA immunoglobulin complex / IgM B cell receptor complex / secretory dimeric IgA immunoglobulin complex / pentameric IgM immunoglobulin complex / monomeric IgA immunoglobulin complex / secretory IgA immunoglobulin complex / IgA binding / glomerular filtration / pre-B cell allelic exclusion ...hexameric IgM immunoglobulin complex / dimeric IgA immunoglobulin complex / IgM B cell receptor complex / secretory dimeric IgA immunoglobulin complex / pentameric IgM immunoglobulin complex / monomeric IgA immunoglobulin complex / secretory IgA immunoglobulin complex / IgA binding / glomerular filtration / pre-B cell allelic exclusion / IgM immunoglobulin complex / CD22 mediated BCR regulation / positive regulation of respiratory burst / humoral immune response / Scavenging of heme from plasma / immunoglobulin complex, circulating / immunoglobulin receptor binding / complement activation, classical pathway / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / antigen binding / Cell surface interactions at the vascular wall / B cell receptor signaling pathway / protein-macromolecule adaptor activity / antibacterial humoral response / protein-containing complex assembly / defense response to Gram-negative bacterium / adaptive immune response / Potential therapeutics for SARS / blood microparticle / 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 | |||||||||
Biological species | ![]() ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.56 Å | |||||||||
![]() | Ji C / Xiao J | |||||||||
Funding support | ![]()
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![]() | ![]() 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 |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 118.1 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 19.5 KB 19.5 KB | Display Display | ![]() |
Images | ![]() | 41.9 KB | ||
Filedesc metadata | ![]() | 7.6 KB | ||
Others | ![]() ![]() | 115.2 MB 115.2 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7y0hMC ![]() 7y09C ![]() 7y0jC ![]() 7yg2C M: atomic model generated by this map C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Voxel size | X=Y=Z: 1.07 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Half map: #2
File | emd_33542_half_map_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Half map: #1
File | emd_33542_half_map_2.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
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Sample components
-Entire : Ternary complex of human IgM-Fc in complex with the J chain and t...
Entire | Name: Ternary complex of human IgM-Fc in complex with the J chain and the P. falciparum VAR2CSA FCR3 |
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Components |
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-Supramolecule #1: Ternary complex of human IgM-Fc in complex with the J chain and t...
Supramolecule | Name: Ternary complex of human IgM-Fc in complex with the J chain and the P. falciparum VAR2CSA FCR3 type: complex / ID: 1 / Parent: 0 / Macromolecule list: #3, #1-#2 |
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Source (natural) | Organism: ![]() ![]() |
-Supramolecule #2: P. falciparum VAR2CSA FCR3
Supramolecule | Name: P. falciparum VAR2CSA FCR3 / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #3 |
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Source (natural) | Organism: ![]() |
-Supramolecule #3: human IgM-Fc
Supramolecule | Name: human IgM-Fc / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #1-#2 |
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-Macromolecule #1: Immunoglobulin heavy constant mu
Macromolecule | Name: Immunoglobulin heavy constant mu / type: protein_or_peptide / ID: 1 / Number of copies: 10 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 41.875766 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: ASAWSHPQFE KGGGSGGGSG GSAWSHPQFE KIDTTIAELP PKVSVFVPPR DGFFGNPRKS KLICQATGFS PRQIQVSWLR EGKQVGSGV TTDQVQAEAK ESGPTTYKVT STLTIKESDW LGQSMFTCRV DHRGLTFQQN ASSMCVPDQD TAIRVFAIPP S FASIFLTK ...String: ASAWSHPQFE KGGGSGGGSG GSAWSHPQFE KIDTTIAELP PKVSVFVPPR DGFFGNPRKS KLICQATGFS PRQIQVSWLR EGKQVGSGV TTDQVQAEAK ESGPTTYKVT STLTIKESDW LGQSMFTCRV DHRGLTFQQN ASSMCVPDQD TAIRVFAIPP S FASIFLTK STKLTCLVTD LTTYDSVTIS WTRQNGEAVK THTNISESHP NATFSAVGEA SICEDDWNSG ERFTCTVTHT DL PSPLKQT ISRPKGVALH RPDVYLLPPA REQLNLRESA TITCLVTGFS PADVFVQWMQ RGQPLSPEKY VTSAPMPEPQ APG RYFAHS ILTVSEEEWN TGETYTCVVA HEALPNRVTE RTVDKSTGKP TLYNVSLVMS DTAGTCY UniProtKB: Immunoglobulin heavy constant mu |
-Macromolecule #2: Immunoglobulin J chain
Macromolecule | Name: Immunoglobulin J chain / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 15.483329 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: EDERIVLVDN KCKCARITSR IIRSSEDPNE DIVERNIRII VPLNNRENIS DPTSPLRTRF VYHLSDLCKK CDPTEVELDN QIVTATQSN ICDEDSATET CYTYDRNKCY TAVVPLVYGG ETKMVETALT PDACYPD UniProtKB: Immunoglobulin J chain |
-Macromolecule #3: Erythrocyte membrane protein 1
Macromolecule | Name: Erythrocyte membrane protein 1 / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 306.371406 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: MDSTSTIANK IEEYLGAKSD DSKIDELLKA DPSEVEYYRS GGDGDYLKNN ICKITVNHSD SGKYDPCEKK LPPYDDNDQW KCQQNSSDG SGKPENICVP PRRERLCTYN LENLKFDKIR DNNAFLADVL LTARNEGEKI VQNHPDTNSS NVCNALERSF A DLADIIRG ...String: MDSTSTIANK IEEYLGAKSD DSKIDELLKA DPSEVEYYRS GGDGDYLKNN ICKITVNHSD SGKYDPCEKK LPPYDDNDQW KCQQNSSDG SGKPENICVP PRRERLCTYN LENLKFDKIR DNNAFLADVL LTARNEGEKI VQNHPDTNSS NVCNALERSF A DLADIIRG TDQWKGTNSN LEKNLKQMFA KIRENDKVLQ DKYPKDQKYT KLREAWWNAN RQKVWEVITC GARSNDLLIK RG WRTSGKS DRKKNFELCR KCGHYEKEVP TKLDYVPQFL RWLTEWIEDF YREKQNLIDD MERHREECTR EDHKSKEGTS YCS TCKDKC KKYCECVKKW KTEWENQENK YKDLYEQNKN KTSQKNTSRY DDYVKDFFEK LEANYSSLEN YIKGDPYFAE YATK LSFIL NPSDANNPSG ETANHNDEAC NCNESGISSV GQAQTSGPSS NKTCITHSSI KTNKKKECKD VKLGVRENDK DLKIC VIED TSLSGVDNCC CQDLLGILQE NCSDNKRGSS SNDSCDNKNQ DECQKKLEKV FASLTNGYKC DKCKSGTSRS KKKWIW KKS SGNEEGLQEE YANTIGLPPR TQSLYLGNLP KLENVCEDVK DINFDTKEKF LAGCLIVSFH EGKNLKKRYP QNKNSGN KE NLCKALEYSF ADYGDLIKGT SIWDNEYTKD LELNLQNNFG KLFGKYIKKN NTAEQDTSYS SLDELRESWW NTNKKYIW T AMKHGAEMNI TTCNADGSVT GSGSSCDDIP TIDLIPQYLR FLQEWVENFC EQRQAKVKDV ITNCKSCKES GNKCKTECK TKCKDECEKY KKFIEACGTA GGGIGTAGSP WSKRWDQIYK RYSKHIEDAK RNRKAGTKNC GTSSTTNAAA STDENKCVQS DIDSFFKHL IDIGLTTPSS YLSNVLDDNI CGADKAPWTT YTTYTTTEKC NKERDKSKSQ SSDTLVVVNV PSPLGNTPYR Y KYACQCKI PTNEETCDDR KEYMNQWSCG SARTMKRGYK NDNYELCKYN GVDVKPTTVR SNSSKLDGND VTFFNLFEQW NK EIQYQIE QYMTNANISC IDEKEVLDSV SDEGTPKVRG GYEDGRNNNT DQGTNCKEKC KCYKLWIEKI NDQWGKQKDN YNK FRSKQI YDANKGSQNK KVVSLSNFLF FSCWEEYIQK YFNGDWSKIK NIGSDTFEFL IKKCGNNSAH GEEIFNEKLK NAEK KCKEN ESTDTNINKS ETSCDLNATN YIRGCQSKTY DGKIFPGKGG EKQWICKDTI IHGDTNGACI PPRTQNLCVG ELWDK SYGG RSNIKNDTKE LLKEKIKNAI HKETELLYEY HDTGTAIISK NDKKGQKGKN DPNGLPKGFC HAVQRSFIDY KNMILG TSV NIYEHIGKLQ EDIKKIIEKG TPQQKDKIGG VGSSTENVNA WWKGIEREMW DAVRCAITKI NKKNNNSIFN GDECGVS PP TGNDEDQSVS WFKEWGEQFC IERLRYEQNI REACTINGKN EKKCINSKSG QGDKIQGACK RKCEKYKKYI SEKKQEWD K QKTKYENKYV GKSASDLLKE NYPECISANF DFIFNDNIEY KTYYPYGDYS SICSCEQVKY YKYNNAEKKN NKSLCYEKD NDMTWSKKYI KKLENGRSLE GVYVPPRRQQ LCLYELFPII IKNEEGMEKA KEELLETLQI VAEREAYYLW KQYNPTGKGI DDANKKACC AIRGSFYDLE DIIKGNDLVH DEYTKYIDSK LNEIFGSSDT NDIDTKRART DWWENETITN GTDRKTIRQL V WDAMQSGV RYAVEEKNEN FPLCMGVEHI GIAKPQFIRW LEEWTNEFCE KYTKYFEDMK SKCDPPKRAD TCGDNSNIEC KK ACANYTN WLNPKRIEWN GMSNYYNKIY RKSNKESEGG KDYSMIMAPT VIDYLNKRCH GEINGNYICC SCKNIGAYNT TSG TVNKKL QKKETECEEE KGPLDLMNEV LNKMDKKYSA HKMKCTEVYL EHVEEQLNEI DNAIKDYKLY PLDRCFDDQT KMKV CDLIA DAIGCKDKTK LDELDEWNDM DLRGTYNKHK GVLIPPRRRQ LCFSRIVRGP ANLRSLNEFK EEILKGAQSE GKFLG NYYK EHKDKEKALE AMKNSFYDYE DIIKGTDMLT NIEFKDIKIK LDRLLEKETN NTKKAEDWWK TNKKSIWNAM LCGYKK SGN KIIDPSWCTI PTTETPPQFL RWIKEWGTNV CIQKQEHKEY VKSKCSNVTN LGAQASESNN CTSEIKKYQE WSRKRSI RW ETISKRYKKY KRMDILKDVK EPDANTYLRE HCSKCPCGFN DMEEMNNNED NEKEAFKQIK EQVKIPAELE DVIYRIKH H EYDKGNDYIC NKYKNIHDRM KKNNGNFVTD NFVKKSWEIS NGVLIPPRRK NLFLYIDPSK ICEYKKDPKL FKDFIYWSA FTEVERLKKA YGGARAKVVH AMKYSFTDIG SIIKGDDMME KNSSDKIGKI LGDTDGQNEK RKKWWDMNKY HIWESMLCGY REAEGDTET NENCRFPDIE SVPQFLRWFQ EWSENFCDRR QKLYDKLNSE CISAECTNGS VDNSKCTHAC VNYKNYILTK K TEYEIQTN KYDNEFKNKN SNDKDAPDYL KEKCNDNKCE CLNKHIDDKN KTWKNPYETL EDTFKSKCDC HHHHHHHH UniProtKB: Erythrocyte membrane protein 1 |
-Macromolecule #5: 2-acetamido-2-deoxy-beta-D-glucopyranose
Macromolecule | Name: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 5 / Number of copies: 10 / Formula: NAG |
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Molecular weight | Theoretical: 221.208 Da |
Chemical component information | ![]() ChemComp-NAG: |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.4 |
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Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K3 (6k x 4k) / Average electron dose: 60.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.0 µm |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
Startup model | Type of model: OTHER |
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Final reconstruction | Applied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.56 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 690345 |
Initial angle assignment | Type: PROJECTION MATCHING |
Final angle assignment | Type: PROJECTION MATCHING |