6N5D

Broadly protective antibodies directed to a subdominant influenza hemagglutinin epitope


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.228 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Influenza Antigen Engineering Focuses Immune Responses to a Subdominant but Broadly Protective Viral Epitope.

Bajic, G.Maron, M.J.Adachi, Y.Onodera, T.McCarthy, K.R.McGee, C.E.Sempowski, G.D.Takahashi, Y.Kelsoe, G.Kuraoka, M.Schmidt, A.G.

(2019) Cell Host Microbe 25: 827

  • DOI: 10.1016/j.chom.2019.04.003
  • Primary Citation of Related Structures:  
    6N5B, 6N5D, 6N5E

  • PubMed Abstract: 
  • Viral glycoproteins are under constant immune surveillance by a host's adaptive immune responses. Antigenic variation including glycan introduction or removal is among the mechanisms viruses have evolved to escape host immunity. Understanding how glycosylation affects immunodominance on complex protein antigens may help decipher underlying B cell biology ...

    Viral glycoproteins are under constant immune surveillance by a host's adaptive immune responses. Antigenic variation including glycan introduction or removal is among the mechanisms viruses have evolved to escape host immunity. Understanding how glycosylation affects immunodominance on complex protein antigens may help decipher underlying B cell biology. To determine how B cell responses can be altered by such modifications, we engineered glycans onto the influenza virus hemagglutinin (HA) and characterized the molecular features of the elicited humoral immunity in mice. We found that glycan addition changed the initially diverse antibody repertoire into an epitope-focused, genetically restricted response. Structural analyses showed that one antibody gene family targeted a previously subdominant, occluded epitope at the head interface. Passive transfer of this antibody conferred Fc-dependent protection to influenza virus-challenged mice. These results have potential implications for next-generation viral vaccines aimed at directing B cell responses to preferred epitope(s).


    Organizational Affiliation

    Ragon Institute of MGH, MIT and Harvard, Cambridge, MA 02139, USA; Department of Microbiology, Harvard Medical School, Boston, MA 02115, USA. Electronic address: aschmidt@crystal.harvard.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HemagglutininA, C [auth B], E [auth K]282Influenza A virusMutation(s): 0 
Gene Names: HA
UniProt
Find proteins for P03437 (Influenza A virus (strain A/Aichi/2/1968 H3N2))
Explore P03437 
Go to UniProtKB:  P03437
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
antibody heavy chainB [auth C], D [auth E], F [auth L]235Mus musculusMutation(s): 0 
Gene Names: HC
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
antibody light chainI [auth D], H [auth F], G [auth N]217Mus musculusMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.228 
  • Space Group: P 31
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 153.19α = 90
b = 153.19β = 90
c = 94.16γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
XSCALEdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction
PHASERphasing

Structure Validation

View Full Validation Report




Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesP01 AI089618

Revision History  (Full details and data files)

  • Version 1.0: 2019-06-05
    Type: Initial release
  • Version 1.1: 2019-06-26
    Changes: Data collection, Database references
  • Version 1.2: 2019-12-18
    Changes: Author supporting evidence