7K0C

Structure of Secretory IgM Core


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure of the human secretory immunoglobulin M core.

Kumar, N.Arthur, C.P.Ciferri, C.Matsumoto, M.L.

(2021) Structure 29: 564-571.e3

  • DOI: 10.1016/j.str.2021.01.002
  • Primary Citation of Related Structures:  
    7K0C

  • PubMed Abstract: 
  • Immunoglobulins (Ig) A and M are the only human antibodies that form oligomers and undergo transcytosis to mucosal secretions via the polymeric Ig receptor (pIgR). When complexed with the J-chain (JC) and the secretory component (SC) of pIgR, secretory IgA and IgM (sIgA and sIgM) play critical roles in host-pathogen defense ...

    Immunoglobulins (Ig) A and M are the only human antibodies that form oligomers and undergo transcytosis to mucosal secretions via the polymeric Ig receptor (pIgR). When complexed with the J-chain (JC) and the secretory component (SC) of pIgR, secretory IgA and IgM (sIgA and sIgM) play critical roles in host-pathogen defense. Recently, we determined the structure of sIgA-Fc which elucidated the mechanism of polymeric IgA assembly and revealed an extensive binding interface between IgA-Fc, JC, and SC. Despite low sequence identity shared with IgA-Fc, IgM-Fc also undergoes JC-mediated assembly and binds pIgR. Here, we report the structure of sIgM-Fc and carryout a systematic comparison to sIgA-Fc. Our structural analysis reveals a remarkably conserved mechanism of JC-templated oligomerization and SC recognition of both IgM and IgA through a highly conserved network of interactions. These studies reveal the structurally conserved features of sIgM and sIgA required for function in mucosal immunity.


    Organizational Affiliation

    Department of Structural Biology, Genentech, 1 DNA Way, South San Francisco, CA 94080, USA. Electronic address: matsumoto.marissa@gene.com.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Polymeric immunoglobulin receptorA [auth C]591Homo sapiensMutation(s): 0 
Gene Names: PIGR
UniProt & NIH Common Fund Data Resources
Find proteins for P01833 (Homo sapiens)
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Go to UniProtKB:  P01833
PHAROS:  P01833
GTEx:  ENSG00000162896 
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UniProt GroupP01833
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Immunoglobulin heavy constant mu369Homo sapiensMutation(s): 0 
Gene Names: IGHM
UniProt & NIH Common Fund Data Resources
Find proteins for P01871 (Homo sapiens)
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PHAROS:  P01871
GTEx:  ENSG00000211899 
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UniProt GroupP01871
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Immunoglobulin J chainJ [auth D]137Homo sapiensMutation(s): 0 
Gene Names: JCHAINIGCJIGJ
UniProt & NIH Common Fund Data Resources
Find proteins for P01591 (Homo sapiens)
Explore P01591 
Go to UniProtKB:  P01591
PHAROS:  P01591
GTEx:  ENSG00000132465 
Entity Groups  
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UniProt GroupP01591
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  • Reference Sequence
Oligosaccharides

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Entity ID: 4
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseM 2N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2021-01-20
    Type: Initial release
  • Version 1.1: 2021-02-10
    Changes: Database references
  • Version 1.2: 2021-06-16
    Changes: Database references