Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C4  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

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

Macromolecule Content

• Total Structure Weight: 46.30 kDa 
• Atom Count: 3823 
• Residue Count: 388 
• Unique protein chains: 1

1L7H

Crystal structure of R292K mutant influenza virus neuraminidase in complex with BCX-1812

• DOI: 10.2210/pdb1L7H/pdb

• Classification: HYDROLASE
• Organism(s): Influenza A virus
• Mutation(s): Yes 


• Deposited: 2002-03-15 Released: 2002-05-29 
• Deposition Author(s): Smith, B.J., McKimm-Breshkin, J.L., McDonald, M., Fernley, R.T., Varghese, J.N., Colman, P.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.85 Å
• R-Value Free: 0.177 
• R-Value Work: 0.145 

Literature

Structural studies of the resistance of influenza virus neuramindase to inhibitors.

Smith, B.J., McKimm-Breshkin, J.L., McDonald, M., Fernley, R.T., Varghese, J.N., Colman, P.M.

(2002) J Med Chem 45: 2207-2212

• PubMed: 12014958 
• DOI: 10.1021/jm010528u
• Primary Citation of Related Structures:  
  1L7H, 1L7G, 1L7F


• PubMed Abstract: 
  

Zanamivir and oseltamivir, specific inhibitors of influenza virus neuraminidase, have significantly different characteristics in resistance studies. In both cases resistance is known to arise through mutations in either the hemagglutinin or neuraminidase surface proteins. A new inhibitor under development by Biocryst Pharmaceuticals, BCX-1812, has both a guanidino group, as in zanamivir, and a bulky hydrophobic group, as in oseltamivir. Using influenza A/NWS/Tern/Australia/G70C/75 (H1N9), neuraminidase variants E119G and R292K have previously been selected by different inhibitors. The sensitivity of these variants to BCX-1812 has now been measured and found in both cases to be intermediate between those of zanamivir and oseltamivir. In addition, the X-ray crystal structures of the complexes of BCX-1812 with the wild type and the two mutant neuraminidases were determined. The ligand is bound in an identical manner in each structure, with a rearrangement of the side chain of E276 from its ligand-free position. A structural explanation of the mechanism of resistance of BCX-1812, relative to zanamivir and oseltamivir in particular, is provided.

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Related Citations: 

• Drug design against a shifting target: a structural basis for resistance to inhibitors in a variant of influenza virus neuraminidase
  Varghese, J.N., Smith, P.W., Sollis, S.L., Blick, T.J., Sahasrabudhe, A., McKimm-Breshkin, J.L., Colman, P.M.
  (1998) Structure 6: 735

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Organizational Affiliation: 

The Walter and Eliza Hall Institute of Medical Research, P.O. Royal Melbourne Hospital, Parkville, Victoria 3050, Australia. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
neuraminidase	A	388	Influenza A virus	Mutation(s): 1  EC: 3.2.1.18
Find proteins for P03472 (Influenza A virus (strain A/Tern/Australia/G70C/1975 H11N9)) Explore P03472  Go to UniProtKB:  P03472

Oligosaccharides

Help

Entity ID: 2
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	B	7		N-Glycosylation

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	2		N-Glycosylation

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
BCZ	A	3-(1-ACETYLAMINO-2-ETHYL-BUTYL)-4-GUANIDINO-2-HYDROXY-CYCLOPENTANECARBOXYLIC ACID C15 H28 N4 O4 XRQDFNLINLXZLB-CKIKVBCHSA-N
NAG	A	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N
GOL	A	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
CA	A	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.85 Å
• R-Value Free: 0.177 
• R-Value Work: 0.145 
• Space Group: I 4 3 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 180.831	α = 90
b = 180.831	β = 90
c = 180.831	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
REFMAC	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-03-15 
• Released Date: 2002-05-29 
Deposition Author(s): Smith, B.J., McKimm-Breshkin, J.L., McDonald, M., Fernley, R.T., Varghese, J.N., Colman, P.M.

Revision History 

• Version 1.0: 2002-05-29
  Type: Initial release
  
• Version 1.1: 2008-04-28
  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: Atomic model, Data collection, Derived calculations, Structure summary