3CHN

Solution structure of human secretory IgA1


Experimental Data Snapshot

  • Method: SOLUTION SCATTERING

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Location of secretory component on the Fc edge of dimeric IgA1 reveals insight into the role of secretory IgA1 in mucosal immunity.

Bonner, A.Almogren, A.Furtado, P.B.Kerr, M.A.Perkins, S.J.

(2009) Mucosal Immunol 2: 74-84

  • DOI: 10.1038/mi.2008.68

  • PubMed Abstract: 
  • Secretory immunoglobulin A (SIgA) is the most prevalent antibody in the human body and a first line of defense in mucosal immunity. We located secretory component (SC) relative to dimeric IgA1 (dIgA1) within the SIgA1 structure using the constrained ...

    Secretory immunoglobulin A (SIgA) is the most prevalent antibody in the human body and a first line of defense in mucosal immunity. We located secretory component (SC) relative to dimeric IgA1 (dIgA1) within the SIgA1 structure using the constrained modeling of solution scattering and analytical ultracentrifugation data. The extended solution structure of dIgA1 is largely preserved within SIgA1. From conformational searches of SC locations, the best-fit SC models within SIgA1 show that SC is extended along the outermost convex edge of the Fc dimer in dIgA1. The topology of our SIgA1 structure reveals that it is able to bind to one FcalphaRI receptor molecule. SC binding to the Fc dimer confers protection to SIgA1 by the masking of proteolytically susceptible surface sites from bacterial proteases in the harsh environment of the mucosa. The models support a "zipper-like" unfolding of SC upon dIgA1 in the formation and transportation of SIgA1 into the mucosa.


    Related Citations: 
    • Solution structure of human secretory component and implication for biological function
      Bonner, A.,Perrier, C.,Corthesy, B.,Perkins, S.J.
      (2007) J.Biol.Chem. 282: 16969
    • Implications of the near-planar solution structure of human myeloma dimeric IgA1 for mucosal immunity and IgA nephropathy
      Bonner, A.,Furtado, P.B.,Almogren, A.,Kerr, M.A.,Perkins, S.J.
      (2008) J. Immunol. 180: 1008
    • The Fab and Fc fragments of IgA1 exhibit a different arrangement from that in IgG: a study by X-ray and neutron solution scattering and homology modelling
      Boehm, M.K.,Woof, J.M.,Kerr, M.A.,Perkins, S.J.
      (1999) J.Mol.Biol. 286: 1421


    Organizational Affiliation

    Division of Biosciences, Institute of Structural and Molecular Biology, University College London, London, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Immunoglobulin kappa light chain
L, M, N, O
214N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Ig alpha-1 chain C region
A, B, D, C
475N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Secretory component
J
106Homo sapiensMutation(s): 0 
Gene Names: PIGR
Find proteins for P01833 (Homo sapiens)
Go to Gene View: PIGR
Go to UniProtKB:  P01833
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Secretory component
S
585Homo sapiensMutation(s): 0 
Gene Names: PIGR
Find proteins for P01833 (Homo sapiens)
Go to Gene View: PIGR
Go to UniProtKB:  P01833
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION SCATTERING
Software Package:
Software NamePurpose
SCTPL7model building
COLETTEdata scaling
GNOMphasing
Insight IImodel building
GNOMmodel building
SCTPL7phasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-12-30
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2011-07-27
    Type: Other
  • Version 1.3: 2017-10-25
    Type: Refinement description
  • Version 1.4: 2018-06-13
    Type: Data collection, Database references