Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report | Ligand Interaction

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: 57.55 kDa 
• Atom Count: 4070 
• Modelled Residue Count: 494 
• Deposited Residue Count: 494 
• Unique protein chains: 1

1HA0

HEMAGGLUTININ PRECURSOR HA0

• PDB DOI: 10.2210/pdb1HA0/pdb

• Classification: VIRAL PROTEIN
• Organism(s): Influenza A virus
• Expression System: Vaccinia virus
• Mutation(s): Yes 


• 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: 2.80 Å
• R-Value Free: 0.302 
• R-Value Work: 0.224 
• R-Value Observed: 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 
• DOI: 10.1016/s0092-8674(00)81771-7
• Primary Citation of Related Structures:  
  1HA0


• 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

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

Oligosaccharides

Help

Entity ID: 2
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	B, C	3		N-Glycosylation
Glycosylation Resources
GlyTouCan:  G15407YE GlyCosmos:  G15407YE GlyGen:  G15407YE

Entity ID: 3
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
alpha-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	D	3		N-Glycosylation
Glycosylation Resources
GlyTouCan:  G62182OO GlyCosmos:  G62182OO GlyGen:  G62182OO

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NAG	E [auth A], F [auth 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: 2.80 Å
• R-Value Free: 0.302 
• R-Value Work: 0.224 
• R-Value Observed: 0.224 
• Space Group: I 2₁ 3

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 153	α = 90
b = 153	β = 90
c = 153	γ = 90

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
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance
• Version 2.0: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Structure summary
• Version 2.1: 2021-11-03
  Changes: Database references, Structure summary