1BJI

THE X-RAY STRUCTURE OF A COMPLEX OF TERN N9 INFLUENZA VIRUS NEURAMINIDASE COMPLEXED WITH THE GLAXO 6-CARBOXAMIDE SIALIC ACID ANALOGUE GR217029


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Work: 0.155 
  • R-Value Observed: 0.155 

Starting Model: experimental
View more details

wwPDB Validation   3D Report Full Report


This is version 2.2 of the entry. See complete history


Literature

Dihydropyrancarboxamides related to zanamivir: a new series of inhibitors of influenza virus sialidases. 2. Crystallographic and molecular modeling study of complexes of 4-amino-4H-pyran-6-carboxamides and sialidase from influenza virus types A and B.

Taylor, N.R.Cleasby, A.Singh, O.Skarzynski, T.Wonacott, A.J.Smith, P.W.Sollis, S.L.Howes, P.D.Cherry, P.C.Bethell, R.Colman, P.Varghese, J.

(1998) J Med Chem 41: 798-807

  • DOI: https://doi.org/10.1021/jm9703754
  • Primary Citation of Related Structures:  
    1A4G, 1A4Q, 1BJI

  • PubMed Abstract: 

    The first paper in this series (see previous article) described structure-activity studies of carboxamide analogues of zanamivir binding to influenza virus sialidase types A and B and showed that inhibitory activity of these compounds was much greater against influenza A enzyme. To understand the large differences in affinities, a number of protein-ligand complexes have been investigated using crystallography and molecular dynamics. The crystallographic studies show that the binding of ligands containing tertiary amide groups is accompanied by the formation of an intramolecular planar salt bridge between two amino acid residues in the active site of the enzyme. It is proposed that the unexpected strong binding of these inhibitors is a result of the burial of hydrophobic surface area and salt-bridge formation in an environment of low dielectric. In sialidase from type A virus, binding of the carboxamide moeity and salt-bridge formation have only a minor effect on the positions of the surrounding residues, whereas in type B enzyme, significant distortion of the protein is observed. The results suggest that the decreased affinity in enzyme from influenza B is directly correlated with the small changes that occur in the amino acid residue interactions accompanying ligand binding. Molecular dynamics calculations have shown that the tendency for salt-bridge formation is greater in influenza A sialidase than influenza B sialidase and that this tendency is a useful descriptor for the prediction of inhibitor potency.


  • Organizational Affiliation

    Department of Biomolecular Structure, Glaxo Wellcome Research and Development Limited, Hertfordshire, U.K.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
NEURAMINIDASE388Influenza A virusMutation(s): 0 
EC: 3.2.1.18
UniProt
Find proteins for P03472 (Influenza A virus (strain A/Tern/Australia/G70C/1975 H11N9))
Explore P03472 
Go to UniProtKB:  P03472
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP03472
Glycosylation
Glycosylation Sites: 3
Sequence Annotations
Expand
  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
B
6N-Glycosylation
Glycosylation Resources
GlyTouCan:  G01760ZU
GlyCosmos:  G01760ZU
GlyGen:  G01760ZU
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
DPC
Query on DPC

Download Ideal Coordinates CCD File 
G [auth A]5-ACETYLAMINO-4-AMINO-6-(PHENETHYL-PROPYL-CARBAMOYL)-5,6-DIHYDRO-4H-PYRAN-2-CARBOXYLIC ACID
C20 H27 N3 O5
ZNRGSYNQOLEMKF-CGTJXYLNSA-N
NAG
Query on NAG

Download Ideal Coordinates CCD File 
D [auth A],
E [auth A]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
MAN
Query on MAN

Download Ideal Coordinates CCD File 
C [auth A]alpha-D-mannopyranose
C6 H12 O6
WQZGKKKJIJFFOK-PQMKYFCFSA-N
CA
Query on CA

Download Ideal Coordinates CCD File 
F [auth A]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
Binding Affinity Annotations 
IDSourceBinding Affinity
G21 PDBBind:  1BJI IC50: 2 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Work: 0.155 
  • R-Value Observed: 0.155 
  • Space Group: I 4 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 182.8α = 90
b = 182.8β = 90
c = 182.8γ = 90
Software Package:
Software NamePurpose
R-AXISdata collection
PROTEINdata reduction
X-PLORmodel building
X-PLORrefinement
R-AXISdata reduction
PROTEINdata scaling
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-06-03
    Type: Initial release
  • Version 1.1: 2008-03-10
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Other, Structure summary
  • Version 2.1: 2024-04-03
    Changes: Data collection, Database references, Refinement description, Structure summary
  • Version 2.2: 2024-10-23
    Changes: Structure summary