Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C3  (3D View)
Global Stoichiometry: Hetero 6-mer - A3B3 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 59.01 kDa 
• Atom Count: 4384 
• Residue Count: 493 
• Unique protein chains: 2

4WE5

The crystal structure of hemagglutinin from A/Port Chalmers/1/1973 influenza virus

• DOI: 10.2210/pdb4WE5/pdb

• Classification: VIRAL PROTEIN
• Organism(s): Influenza A virus (A/Port Chalmers/1/1973(H3N2))
• Expression System: Trichoplusia ni
• Mutation(s): No 


• Deposited: 2014-09-09 Released: 2015-02-11 
• Deposition Author(s): Yang, H., Carney, P.J., Chang, J.C., Guo, Z., Villanueva, J.M., Stevens, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Free: 0.231 
• R-Value Work: 0.182 
• R-Value Observed: 0.184 

Literature

Structure and receptor binding preferences of recombinant human A(H3N2) virus hemagglutinins.

Yang, H., Carney, P.J., Chang, J.C., Guo, Z., Villanueva, J.M., Stevens, J.

(2015) Virology 477C: 18-31

• PubMed: 25617824 
• DOI: 10.1016/j.virol.2014.12.024
• Primary Citation of Related Structures:  
  4WEA, 4WE4, 4WE5, 4WE6, 4WE7, 4WE8, 4WE9


• PubMed Abstract: 
  

A(H3N2) influenza viruses have circulated in humans since 1968, and antigenic drift of the hemagglutinin (HA) protein continues to be a driving force that allows the virus to escape the human immune response. Since the major antigenic sites of the HA overlap into the receptor binding site (RBS) of the molecule, the virus constantly struggles to effectively adapt to host immune responses, without compromising its functionality. Here, we have structurally assessed the evolution of the A(H3N2) virus HA RBS, using an established recombinant expression system. Glycan binding specificities of nineteen A(H3N2) influenza virus HAs, each a component of the seasonal influenza vaccine between 1968 and 2012, were analyzed. Results suggest that while its receptor-binding site has evolved from one that can bind a broad range of human receptor analogs to one with a more restricted binding profile for longer glycans, the virus continues to circulate and transmit efficiently among humans.

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Organizational Affiliation: 

Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Hemagglutinin HA1 chain	A	328	Influenza A virus (A/Port Chalmers/1/1973(H3N2))	Mutation(s): 0  Gene Names: HA
Find proteins for Q1PUD9 (Influenza A virus (strain A/Port Chalmers/1/1973 H3N2)) Explore Q1PUD9  Go to UniProtKB:  Q1PUD9

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Hemagglutinin HA2 chain	B	181	Influenza A virus (A/Port Chalmers/1/1973(H3N2))	Mutation(s): 0  Gene Names: HA
Find proteins for Q1PUD9 (Influenza A virus (strain A/Port Chalmers/1/1973 H3N2)) Explore Q1PUD9  Go to UniProtKB:  Q1PUD9

Oligosaccharides

Help

Entity ID: 3
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	C, D	3		N-Glycosylation

Entity ID: 4
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	E	2		N-Glycosylation

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NAG	A	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Free: 0.231 
• R-Value Work: 0.182 
• R-Value Observed: 0.184 
• Space Group: I 2₁ 3

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 153.128	α = 90
b = 153.128	β = 90
c = 153.128	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2014-09-09 
• Released Date: 2015-02-11 
Deposition Author(s): Yang, H., Carney, P.J., Chang, J.C., Guo, Z., Villanueva, J.M., Stevens, J.

Revision History 

• Version 1.0: 2015-02-11
  Type: Initial release
  
• Version 2.0: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Other, Refinement description, Source and taxonomy, Structure summary