Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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Global Symmetry: Cyclic - C3  (3D View)
Global Stoichiometry: Hetero 12-mer - A3B3C3D3 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 104290.07 
• Atom Count: 7248 
• Residue Count: 930 
• Unique protein chains: 4

1EO8

INFLUENZA VIRUS HEMAGGLUTININ COMPLEXED WITH A NEUTRALIZING ANTIBODY

• DOI: 10.2210/pdb1EO8/pdb

• Classification: Viral protein/Immune system
• Organism(s): Influenza A virus (strain A/Aichi/2/1968 H3N2)


• Deposited: 2000-03-22 Released: 2000-04-12 
• Deposition Author(s): Fleury, D., Gigant, B., Daniels, R.S., Skehel, J.J., Knossow, M., Bizebard, T.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.8 Å
• R-Value Free: 0.298 
• R-Value Work: 0.196 

Literature

Structural evidence for recognition of a single epitope by two distinct antibodies.

Fleury, D., Daniels, R.S., Skehel, J.J., Knossow, M., Bizebard, T.

(2000) Proteins 40: 572-578

• PubMed: 10899782 


• PubMed Abstract: 
  

The structure of a complex between the hemagglutinin of influenza virus and the Fab of a neutralizing antibody was determined by X-ray crystallography at 2.8 A resolution. This antibody and another which has only 56% sequence identity bind to the same epitope with very similar affinities and in the same orientation. One third of the interactions is conserved in the two complexes; a significant proportion of the interactions that differ are established by residues of the H3 complementarity-determining regions (CDR) which adopt distinct conformations in the two antibodies. This demonstrates that there is a definite flexibility in the selection of antibodies that bind to a given epitope, despite the high affinity of their complexes. This flexibility allows the humoral immune response to be redundant, a feature that may be useful in achieving longer lasting protection against evolving viral pathogens.

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Related Citations: 

• Crystallization and Preliminary X-Ray Diffraction Studies of Complexes between an Influenza Hemagglutinin and Fab Fragments of Two Different Monoclonal Antibodies
  Gigant, B.,Fleury, D.,Bizebard, T.,Skehel, J.J.,Knossow, M.
  (1995) Proteins 23: 115
• Structure of the Haemagglutinin Membrane Glycoprotein of Influenza Virus at 3 A Resolution
  Wilson, I.A.,Skehel, J.J.,Wiley, D.C.
  (1981) Nature 289: 366




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Organizational Affiliation: 

Laboratoire d'Enzymologie et Biochimie Structurales, CNRS, France.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
HEMAGGLUTININ (HA1 CHAIN)	A	328	Influenza A virus (strain A/Aichi/2/1968 H3N2)	Mutation(s): 0  Gene Names: HA
Find proteins for P03437 (Influenza A virus (strain A/Aichi/2/1968 H3N2)) Go to UniProtKB:  P03437

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
HEMAGGLUTININ (HA2 CHAIN)	B	175	Influenza A virus (strain A/Aichi/2/1968 H3N2)	Mutation(s): 0  Gene Names: HA
Find proteins for P03437 (Influenza A virus (strain A/Aichi/2/1968 H3N2)) Go to UniProtKB:  P03437

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details
ANTIBODY (LIGHT CHAIN)	L	210	N/A	Mutation(s): 0
Protein Feature View is not available: No corresponding UniProt sequence found.

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details
ANTIBODY (HEAVY CHAIN)	H	217	N/A	Mutation(s): 0
Protein Feature View is not available: No corresponding UniProt sequence found.

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
MAN	A	ALPHA-D-MANNOSE C6 H12 O6 WQZGKKKJIJFFOK-PQMKYFCFSA-N
NAG	A, B	N-ACETYL-D-GLUCOSAMINE C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.8 Å
• R-Value Free: 0.298 
• R-Value Work: 0.196 
• Space Group: P 3 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 138.150	α = 90.00
b = 138.150	β = 90.00
c = 129.500	γ = 120.00

Software Package:

Software Name	Purpose
SCALEPACK	data scaling
X-PLOR	refinement
AMoRE	phasing
DENZO	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-03-22 
• Released Date: 2000-04-12 
• Deposition Author(s): Fleury, D., Gigant, B., Daniels, R.S., Skehel, J.J., Knossow, M., Bizebard, T.

Revision History 

• Version 1.0: 2000-04-12
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Non-polymer description, Version format compliance
• Version 1.3: 2017-10-04
  Type: Refinement description