Biological Assembly 1  

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Global Symmetry: Cyclic - C3  (3D View)
Global Stoichiometry: Homo 3-mer - A3 

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

Macromolecule Content

• Total Structure Weight: 57656.92 
• Atom Count: 4033 
• Residue Count: 494 
• Unique protein chains: 1

1HA0

HEMAGGLUTININ PRECURSOR HA0

• DOI: 10.2210/pdb1HA0/pdb

• Classification: VIRAL PROTEIN
• Organism(s): Influenza A virus (strain A/Aichi/2/1968 H3N2)
• Expression System: Vaccinia virus
• Mutation(s): 1 


• Deposited: 1998-10-08 Released: 1998-10-12 
• Deposition Author(s): Chen, J., Ho Lee, K., Steinhauer, D.A., Stevens, D.J., Skehel, J.J., Wiley, D.C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.8 Å
• R-Value Free: 0.302 
• R-Value Work: 0.224 

Literature

Structure of the hemagglutinin precursor cleavage site, a determinant of influenza pathogenicity and the origin of the labile conformation.

Chen, J., Lee, K.H., Steinhauer, D.A., Stevens, D.J., Skehel, J.J., Wiley, D.C.

(1998) Cell 95: 409-417

• PubMed: 9814710 


• PubMed Abstract: 
  

The membrane fusion potential of influenza HA, like many viral membrane-fusion glycoproteins, is generated by proteolytic cleavage of a biosynthetic precursor. The three-dimensional structure of ectodomain of the precursor HA0 has been determined and compared with that of cleaved HA. The cleavage site is a prominent surface loop adjacent to a novel cavity; cleavage results in structural rearrangements in which the nonpolar amino acids near the new amino terminus bury ionizable residues in the cavity that are implicated in the low-pH-induced conformational change. Amino acid insertions at the cleavage site in HAs of virulent avian viruses and those of viruses isolated from the recent severe outbreak of influenza in humans in Hong Kong would extend this surface loop, facilitating intracellular cleavage.

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Organizational Affiliation: 

Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 02138, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
PROTEIN (HEMAGGLUTININ PRECURSOR)	A	494	Influenza A virus (strain A/Aichi/2/1968 H3N2)	Mutation(s): 1  Gene Names: HA
Find proteins for P03437 (Influenza A virus (strain A/Aichi/2/1968 H3N2)) Go to UniProtKB:  P03437

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
MAN	A	ALPHA-D-MANNOSE C6 H12 O6 WQZGKKKJIJFFOK-PQMKYFCFSA-N
BMA	A	BETA-D-MANNOSE C6 H12 O6 WQZGKKKJIJFFOK-RWOPYEJCSA-N
NAG	A	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: 0.302 
• R-Value Work: 0.224 
• Space Group: I 2₁ 3

Unit Cell:

Length (Å)	Angle (°)
a = 153.000	α = 90.00
b = 153.000	β = 90.00
c = 153.000	γ = 90.00

Software Package:

Software Name	Purpose
AMoRE	phasing
X-PLOR	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1998-10-08 
• Released Date: 1998-10-12 
• Deposition Author(s): Chen, J., Ho Lee, K., Steinhauer, D.A., Stevens, D.J., Skehel, J.J., Wiley, D.C.

Revision History 

• Version 1.0: 1998-10-12
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Derived calculations, Version format compliance