Biological Assembly 1  

 3D View: Structure | 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: 59.47 kDa 
• Atom Count: 4088 
• Residue Count: 511 
• Unique protein chains: 2

2RFT

Crystal structure of influenza B virus hemagglutinin in complex with LSTa receptor analog

• DOI: 10.2210/pdb2RFT/pdb

• Classification: VIRAL PROTEIN
• Organism(s): Influenza B virus (B/Hong Kong/8/1973)
• Expression System: Influenza B virus
• Mutation(s): No 


• Deposited: 2007-10-01 Released: 2008-02-05 
• Deposition Author(s): Wang, Q., Tian, X., Chen, X., Ma, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.299 
• R-Value Work: 0.280 
• R-Value Observed: 0.282 

Literature

Structural basis for receptor specificity of influenza B virus hemagglutinin.

Wang, Q., Tian, X., Chen, X., Ma, J.

(2007) Proc Natl Acad Sci U S A 104: 16874-16879

• PubMed: 17942670 
• DOI: 10.1073/pnas.0708363104
• Primary Citation of Related Structures:  
  2RFU, 2RFT


• PubMed Abstract: 
  

Receptor-binding specificity of HA, the major surface glycoprotein of influenza virus, primarily determines the host ranges that the virus can infect. Influenza type B virus almost exclusively infects humans and contributes to the annual "flu" sickness. Here we report the structures of influenza B virus HA in complex with human and avian receptor analogs, respectively. These structures provide a structural basis for the different receptor-binding properties of influenza A and B virus HA molecules and for the ability of influenza B virus HA to distinguish human and avian receptors. The structure of influenza B virus HA with avian receptor analog also reveals how mutations in the region of residues 194 to 196, which are frequently observed in egg-adapted and naturally occurring variants, directly affect the receptor binding of the resultant virus strains. Furthermore, these structures of influenza B virus HA are compared with known structures of influenza A virus HAs, which suggests the role of the residue at 222 as a key and likely a universal determinant for the different binding modes of human receptor analogs by different HA molecules.

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Organizational Affiliation: 

Department of Biochemistry and Molecular Biology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Influenza B hemagglutinin (HA)	A	344	Influenza B virus (B/Hong Kong/8/1973)	Mutation(s): 0  Gene Names: Hemagglutinin, HA
Find proteins for P03462 (Influenza B virus (strain B/Hong Kong/8/1973)) Explore P03462  Go to UniProtKB:  P03462

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Influenza B hemagglutinin (HA)	B	176	Influenza B virus (B/Hong Kong/8/1973)	Mutation(s): 0  Gene Names: Hemagglutinin, HA
Find proteins for P03462 (Influenza B virus (strain B/Hong Kong/8/1973)) Explore P03462  Go to UniProtKB:  P03462

Oligosaccharides

Help

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

Entity ID: 4
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
N-acetyl-alpha-neuraminic acid-(2-3)-beta-D-galactopyranose-(1-3)-2-acetamido-2-deoxy-alpha-D-glucopyranose-(1-3)-beta-D-galactopyranose-(1-4)-beta-D-glucopyranose	G	5		N/A

Small Molecules

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

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.299 
• R-Value Work: 0.280 
• R-Value Observed: 0.282 
• Space Group: P 3 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 98.328	α = 90
b = 98.328	β = 90
c = 135.988	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
HKL-2000	data collection
HKL-2000	data reduction
HKL-2000	data scaling
AMoRE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2007-10-01 
• Released Date: 2008-02-05 
Deposition Author(s): Wang, Q., Tian, X., Chen, X., Ma, J.

Revision History 

• Version 1.0: 2008-02-05
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Non-polymer description, Version format compliance
• Version 2.0: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary